CN1028946C - Radio paging system having a plurality of transmitter stations - Google Patents

Radio paging system having a plurality of transmitter stations Download PDF

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Publication number
CN1028946C
CN1028946C CN 93101572 CN93101572A CN1028946C CN 1028946 C CN1028946 C CN 1028946C CN 93101572 CN93101572 CN 93101572 CN 93101572 A CN93101572 A CN 93101572A CN 1028946 C CN1028946 C CN 1028946C
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signal
time
paging
transmission
base station
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CN 93101572
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CN1091564A (en
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市川善朗
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日本电气株式会社
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Abstract

一种全球无线寻呼系统。 A global wireless paging system. 一个通过公用电话交换网接收寻呼电话的寻呼控制器预先存储一条传输线中一个寻呼请求信号的传输时间与每个基地台处理该寻呼请求信号所需时间之和的最大值,并且根据来自一个GPS(全球定位系统)卫星的基准信号产生一个高精确度时间信号。 Receiving a paging call through public switched telephone network paging controller previously stores a transmission line in a paging request transmission processing time of the paging request signal and the sum of the maximum time required for each base station signal, and in accordance with reference signal from a GPS (global positioning system) satellites to generate a high precision time signal. 在每个基地台中根据来自GPS卫星的基准时间信号产生一个高精确度时间信号,并且根据高精确度时间信号处理经传输线的寻呼请求信号,将其格式转换成数字寻呼信号,以便实现载波的同步调制。 Each base station is generated based on the reference time signal from the GPS satellites a high precision time signal, according to the paging request signal and high-precision time signal processing via the transmission line, converts it into a digital format of a paging signal, so as to achieve carrier the synchronous modulation.

Description

本发明涉及一种无线寻呼系统,特别是涉及一种全球无线寻呼系统,其中从多个相距遥远的基地台分别发射多个具有相同频率,并且由相同的数字选择呼叫信号,即寻呼信号同步地调制的射频载波。 The present invention relates to a radio paging system, particularly relates to a global paging system, which are far away from the plurality of base stations each transmit a plurality of same frequency, and the selective calling signal by the same numerals, i.e. the paging synchronization signal modulated RF carrier.

在无线寻呼系统中,为了使其覆盖区域较大,通常设置多个相互分开一个预定距离的基地台,每个基地台有一台输出功率约为100W数量级的无线电发射机,并且同时发射多个具有相同频率,并且由相同的数字寻呼信号调制的射频载波。 In the radio paging system, in order to cover a larger area, typically a plurality of mutually separated a predetermined distance from the base station, each base station has an output power of about 100W magnitude of a radio transmitter and simultaneously transmitting a plurality of having the same frequency and a paging signal by the same digital modulated RF carrier. 在这种无线寻呼系统中,在可以接收到来自相邻的两个基地台的这种射频载波的区域内,即干涉区内,需要把两个接收载波之间的相位差限制在不大于一个恒定值的数值内,该恒定值通常在数字寻呼信号的一个比特间隔的四分之一范围内。 In such a radio paging system, in the region of such a radio frequency carrier can be received from two adjacent base stations, i.e. the interference area, the need to the received carrier phase difference between the two is limited to not more than the value of a constant value, this constant value is typically in the range of one quarter of a digital paging signal in the bit interval. 例如,在采用POCSAG(邮政编码标准化顾问组)标准的512BPS数字寻呼信号,即POCSAG码的寻呼系统中,上述相位差必须不大于488μS。 For example, using the POCSAG (Postal Code Standardization Advisory Group) standard 512BPS digital paging signal, i.e. POCSAG paging system code, the phase difference must be no greater than 488μS. 因此,需要使每个基地台中参考相位的相位误差不大于250μS。 Therefore, the phase error of each base station is not greater than the reference phase 250μS.

另一方面,这种类型的寻呼系统中在基地台与接收寻呼请求的电话交换网之间装设有一个中央台。 On the other hand, this type of paging system mounted with a central station between a base station and a switched telephone network receives a paging request. 该中央台包括一个寻呼控制器,用于执行把来自用户的寻呼请求数据转换成预定信号格式的格式转换,例如转换成按照POCSAG码的寻呼请求信号格式。 The central station includes a paging controller for performing the paging request from the user data into a predetermined format converting signal format, for example, is converted into POCSAG paging code in accordance with a request signal format.

中央台与基地台之间的接口由电缆或射频时分多路复用器构成。 The interface between the central station and a base station consists of a cable or radio frequency division multiplexer. 为了补偿由信号在中央台与基地台之间的连接电路上的传送所造成的延迟,以便把相位误差限制在预定范围(约250μS)之内,中央台和基地台分别设有可变的延迟装置。 To transmit a signal from the delay compensation circuit on the connection between the central station and a base station caused by the phase error so as to limit within a predetermined range (approximately 250 s), the central station and base stations are provided with a variable delay device. 另一方面,美国专利4,709,401号公开了一种寻呼系统的实例,其中的中央台向基地台发射一个用具有预定码型的相位校正码调制的射频载波信号,并且由一个基地台接收该载波信号然后将其解调成为相位校正码,再根据相位校正码为其自身的可变延迟装置计算和设定一定量的延迟。 On the other hand, U.S. Patent No. 4,709,401 discloses an example of a paging system in which the central station transmits to the base station having a phase correction code modulated RF carrier signal of a predetermined code pattern, and is composed of a base the station receiving carrier signal is then demodulated into a phase correcting code, and then setting means calculates an amount of delay in accordance with its own variable delay phase correction code.

一般来说,由于中央台与一个基地台之间的上述连接电路是由一个普通路由及一个附加路由构成的,在上述美国专利的相位同步系统中,如果因普通电路的故障从普通电路切换到附加电路,就需要对计算结果和设定的延迟量进行重算。 In general, since the connection circuit between the central station and a base station by a common route and a route composed of additional, above-described in U.S. Patent phase synchronization system, if due to a failure in the conventional circuit to switch from the conventional circuit additional circuitry, it is necessary to set the delay amount calculation and recalculation is performed.

此外,如果数字寻呼信号的比特率为了满足对射频载波的有效利用率的新的需求而进一步增加,按照上述现有技术的相位校正精度就不够了。 Further, if the bit rate of the digital paging signal to meet new requirements for the effective utilization of the radio frequency carrier is further increased, in accordance with a phase correction accuracy of the above-described prior art it is not enough. 此时,在对应比特率为9600BPS的POCSAG码的无线寻呼系统中,所要求的相位校正精度应不大于26μS。 At this time, the corresponding bit rate of the POCSAG code 9600BPS radio paging system, the phase correction required accuracy should be less than 26μS. 这就意味着在发射机的一个调制输入端上的相位校正精度必须处在大约10μS之内,这在实际中是不可能的,因为在发射机的调制输入端上会不可避免地产生不同射频传输区域间的延迟误差和/或发射机的相位误差。 This means that a phase correction accuracy in the modulation input of the transmitter must be in the range of about 10μS, in practice this is not possible, since the yield different radio frequency transmitter modulation input unavoidably phase error and delay error / or between the transmission area of ​​the transmitter. 此外,在上述现有技术中,连接中央台和基地台的传输线中的延迟量的变化必须小于上述可容忍的相位误差。 Further, in the above-described prior art, the connection change of the transmission line delay amount central station and the base station must be less than the above-described tolerable phase error. 然而,在时分多路复用器电路中很难实现上述精度。 However, in a time division multiplexer circuit is difficult to achieve the above accuracy. 由于寻呼控制器和时分多路复用器的时钟脉冲通常是相互独立的,为隔开上述传输线中的时分多路复用信号而增加的信号延迟是不断变化的。 Since the clock pulses and time division multiplexing the paging controller is typically independent of each other, a time division multiplexed signal is separated from said transmission line to increase the signal delay is constantly changing. 因此,如果要限制延迟量的变化,时分多路复用就要被限制,就有必要增加射频传输线的数量,从而导致增加设备和传输线的维护费用。 Therefore, to limit variation in the delay amount should be limited to time-division multiplexing, it is necessary to increase the number of radio frequency transmission line, resulting in increase in equipment maintenance costs of the transmission line.

另外,为了扩展覆盖面积,就要增加基地台的数量,这就需要增加中央台与基地台之间的连接电路数量,从而使设备及连接电路的维护费用增大。 Further, in order to expand coverage, increase the number of base stations, which is necessary to increase the number of connection circuits between the central station and a base station, so that the equipment maintenance costs and the connection circuit increases.

为了有效地解决这一问题,可以采用一个多点系统,其中,把多个基地台连接到一条线路上;或者采用树形连接系统,其中在中央台与基地台之间设置一个信号分配器。 To effectively address this issue, a multi-point system may be employed, wherein the plurality of base stations connected to a line; system or form a tree, in which a signal divider between a central station and a base station. 然而,在多点系统中,传输线的结构是随着中央台与基地台之间的线路位置而变化的,因此,当延迟量发生变化时,就会使相位校正变得很困难。 However, in a multi-point system, the structure of the transmission line, with the line between the center position of the station and a base station varies, and therefore, when the delay amount is changed, the phase correction will become difficult. 也就是说,尽管出现在中央台一边的部分传输线上的延迟量的变化不会产生任何问题,因为所有联接到中央台的基地台的相位都同样地改变,但是发生在基地台一边的延迟量的变化会在基地台之间造成相位误差。 That is, despite the delay amount in the center portion of the transmission line side of the station changes without any problem, because all the base stations coupled to the phase of the central station are changed in the same manner, but occurs at the base station side of the delay amount the changes will result in a phase error between a base station. 在树形系统中,尽管有可能缩短传输线的总长度,增设的信号分配器也会相应地使延迟量的变化增大。 In the tree system, although it is possible to shorten the overall length of the transmission line, the additional signal so that the dispenser will be a corresponding change in the delay amount increases. 因此,当数字寻呼信号的比特率增大时,很难在多个基地台的发送输出端之间维持相位同步。 Thus, when the bit rate of the digital paging signal is increased, it is difficult to maintain phase synchronization between the transmission output of a plurality of base stations. 如果使用多个信号分配器,设置在分配器后级一边的基地台中的相位校正就会变得很困难。 If a plurality of signal divider, a phase correction is difficult disposed after the dispenser side of the depot station it becomes.

因此,本发明的一个目的就是提供一种无线寻呼系统,它具有向多个基地台发送一个数字寻呼信号的连接线,从而可以向基地台发送多个频率相同,并且用相同的寻呼信号同步调制的射频载波,其中用数字寻呼信号调制射频载波的同步精度可以保持在很高精度,并且不受联接线中延迟变化的影响。 It is therefore an object of the present invention is to provide a radio paging system having a digital paging signal transmitted to a plurality of base stations connected to the line, the base station can be transmitted to a plurality of the same frequency and with the same paging modulated RF carrier signal synchronized, wherein the synchronization accuracy with the digital paging signal modulated radio frequency carrier can be maintained at a very high accuracy, and is not affected by variations in the delay line is coupled.

本发明的另一个目的是提供一种上述类型的无线寻呼系统,与基地台数量的增加以及射频载波数量的增加相比,该系统可以限制连接线数量的增加。 Another object of the present invention is to provide a radio paging system of the type described above, and the increase compared to the increase in the number of radio frequency carriers of the number of base stations, the system can limit the increase in the number of connecting lines.

本发明属于一种用于为分布在多个基地台的覆盖面积内的多个寻呼接收机提供寻呼服务的全球寻呼系统,它包括,一个寻呼控制器,响应一个通过PSIN(公用电话交换网)接收的PSTN用户寻呼,产生一个包含被呼叫的寻呼接收机持有者的用户号码的寻呼请求信号,以及多个基地台,它们通过具有不同传输时间的多条传输线连接到寻呼控制器上,并且分别响应上述寻呼请求信号,产生具有相同频率并且由一个数字寻呼信号同步调制的射频载波,其中的寻呼控制器包括一个延迟时间存储记忆电路,用于预先存储一个与传输线的传输时间差最大值相等的第一时间值,以及存储一个供每个基地台接收该寻呼请求信号,并产生数字寻呼信号所需的第二时间值,一个第一GPS(全球定位系统)接收机,响应从多个NAVSTAR GPS卫星接收到的信号,产生一个时间基准信号 The present invention resides in a global paging system for providing paging service within the plurality of paging receivers distributed in a plurality of base stations for coverage, which comprises a paging controller responsive by PSIN is a (common switched telephone network) the PSTN user paging receiver generates a paging subscriber number of the called paging receiver holder comprises a request signal, and a plurality of base stations, which are connected by a plurality of transmission lines having different transmission times to the paging controller, and are responsive to said paging request signal, generating a radio frequency carrier having the same frequency and synchronous modulation by a digital paging signal, wherein the paging controller includes a delay time storage memory circuit for advance storing a transmission time of the transmission line a first time difference value equal to the maximum value, and storing for each of a base station receives the paging request signal, and generating a second time value required for the digital paging signal, a first GPS ( global positioning system) receiver, in response to signals received from a plurality of NAVSTAR GPS satellites to generate a time reference signal ,第一时间基准电路响应该时间基准信号,产生一个与通用标准时间具有预定时间关系的高精确度时间信号,以及一个附码装置,用于在一个时刻之后为寻呼请求信号附加一个表示时间的编码,用作传输起始时间赋值码,其中的编码是通过在由高精确度时间信号表示的现行时间上加上第一时间值与第二时间值之和获得的,并且每个基地台都包括一个接收缓冲存贮装置,用于接收及暂存寻呼请求信号,一个第二GPS接收机响应来自GPS卫星的信号,产生时基信号,一个第二时间基准电路响应该时间参考信号,产生一个与通用标准时间具有预定时间关系的高精确度时间信号,一个重合电路,用于检测在接收缓冲存贮装置中计算出的寻呼请求信号的传输起始时间赋值码与来自第二时间基准电路的高精确度时间信号之间的重合性,一个格式转换,用于执行格式 , A first time reference circuit responsive to the time reference signal to generate a high precision time signal having a predetermined time relationship with the universal standard time, and a code attachment means for a time after a paging request signal attached represents time coding, as a transmission start time assigning code, wherein the code is a first time value by adding the current time indicated by the high precision time signal and the second time value obtained from a sum, and each base station comprises a receiving buffer memory means for receiving and temporarily storing a paging request signal, a second GPS receiver in response to a signal from a GPS satellite, time base signal is generated, a second time reference circuit responsive to the time reference signal, generating high precision time signal having a predetermined time relationship with the universal standard time, a coincidence circuit for detecting a transmission start time calculated in a buffer memory means for receiving the page request signal from the assignment of code and a second time coincidence between the high accuracy time reference signal circuit, a format conversion for performing format 换电路,从重合电路产生重合输出信号的时刻起与来自第二时间基准电路的高精确度时间信号同步地把寻呼请求信号转换成数字寻呼信号,以及一个无线电发射机,用于产生具有预定频率并且由数字寻呼信号调制的射频载波。 Conversion circuit, from generating an output signal from the coincidence timing coincidence circuit with high precision time signal from the second time reference circuit of the paging request signal is converted into a digital paging signal, and a radio transmitter synchronization for generating a predetermined frequency and a paging signal by the digital modulated RF carrier.

按照本发明的无线寻呼系统,在一方面把传输起始时间信息附加在构成射频载波调制信号的数字寻呼信号上,另一方面,在各个基地台中,在通过使用来自GPS卫星的作为基准时间的高精确度时间信息指定的一个时刻用寻呼信号同步地调制多个有相同频率的射频载波。 Radio paging system according to the present invention, in one aspect the transmission start time information added to the digital RF carrier modulated signal including the paging signal, on the other hand, in each base station, by using as a reference from the GPS satellites high precision time information of the time specified by the time a paging signal modulated in synchronization with a plurality of the same RF carrier frequency. 因此有可能在寻呼接收机接收到被调制的射频载波时防止来自相邻基地台的输出信号之间的干扰。 Thus it is possible to prevent interference between the output signal from the neighboring base stations when the received modulated radio frequency carrier at the paging receiver.

通过以下结合附图的详细描述可以更清楚地认识到本发明的上述及其他目的、特征和优点,其中:图1是本发明第一实施例的电路框图; It can be more clearly appreciated that the above and other objects, features and advantages of the present invention, the following detailed description in conjunction with the accompanying drawings, wherein: FIG. 1 is a circuit block diagram of a first embodiment of the present invention;

图2是图1所示实施例中的中央控制部分的详细电路框图; 2 is a detailed circuit block diagram of the central portion of the embodiment illustrated in FIG. 1 is a control;

图3是图1所示实施例中编码控制部分的详细电路框图; 3 is a detailed circuit block diagram of FIG. 1 shown in the embodiment of the coding control section;

图4是图1所示实施例中寻呼控制器的工作流程图; FIG 4 is a flowchart of a paging controller in the embodiment shown in Figure 1 embodiment;

图5是图1所示实施例中的寻呼请求信号格式的时序图; FIG 5 is a timing chart of a paging request signal format of the embodiment illustrated in FIG. 1;

图6是图3所示编码控制部分中的信号的时间位置关系的时序图; FIG 6 is a timing chart showing the time relationship between the position signal coding control portion shown in FIG 3;

图7是图1所示实施例中调制信号的时间位置关系的时序图; 7 is a timing diagram of the signal modulation time of the positional relationship shown in FIG. 1 embodiment;

图8是本发明第二实施例的电路框图,其中的各个基地台发送两个互不相同的非调制的射频载波; FIG 8 is a circuit block diagram of a second embodiment of the present invention, wherein each of two mutually different base station transmits unmodulated RF carrier;

图9是一个时序图,它表示图8所示第二实施例的调制信号的时间位置关系; FIG 9 is a timing chart showing the time that the positional relationship shown in FIG. 8 a second embodiment of the modulated signal;

图10为本发明第三实施例的电路框图; FIG 10 is a circuit block diagram of the third embodiment of the present invention;

图11是一个时序图,它表示图10所示第三实施例中的调制信号的时间位置关系;以及图12表示本发明第四实施例的系统结构。 FIG 11 is a timing view showing a positional relationship between the time modulated signal in the third embodiment shown in FIG. 10; and FIG. 12 shows a system configuration of a fourth embodiment of the present invention.

图1以框图的形式表示了按照本发明第一实施例的寻呼系统,一个设在中央台内的寻呼控制器10连接到公用电话交换网(PSTN)40,并且从电话终端41接收寻呼电话信号。 1 shows in block diagram form the connection according to a first embodiment of the present invention, a paging controller embodiment of the paging system, a central station located within the public switched telephone network 10 (PSTN) 40, and receives from the telephone terminal 41 to find call telephone signal. 寻呼控制器10包括一个PSTN接口单元110用于控制与PS TN40的连接,并且接收一个由PSTN40根据寻呼电话信号而产生的寻呼电话接收信号,一个中央控制单元120响应该寻呼电话接收信号,产生一个附加有传输起始时间赋值码的寻呼请求信号,输出接口单元130和131负责把寻呼请求信号分别施加到连接基地台20和21的传输线60和61上,一个用户数据文件140包含有寻呼接收机80(在图1中为了便于说明只表示出一个)的用户号码的登记/非登记信息,以及一个GPS接收机150用于从NAVSTAR GPS(导航卫星时间及测距全球定位系统)卫星90接收信号,产生与通用标准时间非常精确地同步的时钟脉冲和时间信息,并将它们提供给中央控制单元20。 Paging controller 10 includes a PSTN interface 110 for connecting the control unit to the PS TN40, and receives a pager signal received by the pager according PSTN40 signal generated, a central control unit 120 in response to receiving the paging telephone signal, generates a transmission start time assigning attached paging code request signal, and an output interface unit 130 is responsible for the page request signal 131 are applied to the connection the base station 21 and the transmission lines 20 and 60 61, a user data file the paging receiver 140 comprises 80 (only one is shown for ease of illustration in FIG. 1) of the subscriber number registration / non-registration information, and a GPS receiver 150 is used from the NAVSTAR GPS (global navigation satellite time and ranging 90 receives signals positioning system) satellite, generates a clock pulse and time information very exactly synchronized with the universal standard time, and supplies them to the central control unit 20. 基地台20包括一个输入接口单元210用于通过传输线60接收寻呼请求信号,一个GPS接收机230,它与GPS接收机150的工作方式相似,用于从GPS卫星90接收信号,并产生与通用标准时间非常精确地同步的时钟脉冲和时间信息,一个编码控制单元220用于对附加有传输起始时间赋值码的寻呼请求信号进行格式转换,将其转换成数字寻呼信号,以及一个发射机240,用于以时间信息为基础输出用数字寻呼信号调制的射频载波。 Base station 20 comprises an input interface unit 210 for receiving the paging request signal through the transmission line 60, a GPS receiver 230, it works similar to the GPS receiver 150 for receiving signals from GPS satellites 90, and generates common a clock pulse and time information very exactly synchronized standard time, and a coding control unit 220 for the transmission start time has additional code assigned paging request signal format conversion, converts it into a digital paging signal, and a transmitter machine 240, time information for outputting based on a digital RF carrier modulated by a paging signal. 基地台21具有与基地台20相同的结构,因此在图1中省略了其细节。 Base station 21 has the same structure with the base station 20, the details thereof are omitted in FIG.

GPS接收机150和230可能具有相同的结构。 GPS receiver 150 and 230 may have the same structure. 需要指出的是,使用GPS接收机来产生与通用标准时间同步的时钟脉冲和时间信息的手段是众所周知的,并且在美国专利5,134,407号中公开了一种在两个相距遥远的点上根据该时间信息计算准确时间的方法。 It should be noted that the clock means and the time information using the GPS receiver to produce synchronized with the universal standard time is well known, and are disclosed in a two points far apart in U.S. Patent No. 5,134,407 the method of calculating the accurate time based on the time information. GPS接收机的最初目的是用于根据来自多个GPS卫星的轨道信息和时间基准信息检测位置,也就是确定接收机的位置。 The original purpose of the GPS receiver is used in accordance with the time reference information and orbit information from a plurality of GPS satellites detected position, i.e. the position of the receiver determined. 在各个GPS卫星上装有使用铯和铷的原子钟,从地球上向该原子钟提供相对于通用标准时间的时间误差信息。 On each of the GPS satellites with atomic clocks using cesium and rubidium, provided from the earth with respect to the atomic clock time error universal standard time information. 因此,原子钟与通用标准时间基本吻合。 Therefore, with the universal standard atomic clock time basically. 因此,由各个GPS接收机150和230产生的时间信息相对于通用标准时间的误差在5μS之内,显示出很高精确度的时间信息。 Thus, each time information generated by the GPS receiver 150 and 230 with respect to the universal standard time is an error in the 5μS, shows high accuracy time information.

图2更详细地表示了中央控制单元120。 Figure 2 shows the central control unit 120 in more detail. 在图2中的中央控制单元120包括一个排队处理器121,用于暂存来自PSTN接口单元110的寻呼电话接收信号并将其排队,一个排队定时器123用于产生一个具有预定间隔的定时信号TQ,该间隔表示电话接收信号在时间轴上的分布,一个延迟时间存储器124,用于存储传输线60和61的延迟时间以及基地台20和21的处理时间之中的延迟时间的最大值,一个基准时间脉冲发生器电路125用于根据GPS接收机150的输出产生与通用标准时间同步的时钟脉冲和时间信息,以及一个控制电路122,用于控制上述电路,每当收到定时信号TQ时就把存在排队处理器121中的电话接受信号的格式转换成一组寻呼请求信号,还用于根据由基准时间脉冲发生器电路115的输出表示的现行时间以及由延迟时间存储器124的输出表示的延迟时间来计算传输起始时间,为寻呼请求信号附加一个与计算出的时间 The central control unit 120 in FIG. 2 comprises a queue processor 121, for temporarily storing the received pager signals from the PSTN line interface unit 110 and it is, a timer 123 for generating a timing line having a predetermined interval signal TQ, denotes the spacer profile received telephone signals on the time axis, a time delay memory 124 for storing the maximum value of the transmission lines 60 and 61, and the delay time of the delay time among the processing time of the base station 20 and 21, a reference time pulse generator circuit 125 for generating a clock pulse and time information based on the output of the GPS receiver 150 synchronized with the universal standard time, and a control circuit 122 for controlling the circuit, each time upon receipt of the timing signal TQ there is no conversion processor 121 to put the telephone line receiving the signal format of the request into a set of paging signals, also based on an output for indicating the current time represented by the output of the reference time pulse generator circuit 115 and a memory 124 by the delay time calculating a transmission delay time start time, the paging request signal attached with the calculated time 对应的编码,然后例如分别通过输出接口单元130和131把寻呼请求信号提供给基地台20和21。 Corresponding coding, and then supplied to the base station 20 and 21, respectively, for example, a request signal via the output interface unit 130 and paging 131.

图3更详细地表示了编码控制单元220。 3 shows a coding control unit 220 in more detail. 在图3中,编码控制单元220包括一个接收缓冲器221,用于从输入接口单元210接收附加有传输起始时间赋值码的寻呼请求信号并将其暂存,一个基准时间脉冲发生器电路225用于根据GPS接收机230的输出产生与通用标准时间同步的时钟脉冲和时间信息,一个重合电路222用于检测由基准时间脉冲表示的现行时间与接收缓冲器221中的寻呼请求信号的赋值时间之间的重合,并且输出一个发送信号SS,一个传输数据转换器224用于寻呼信号的格式转换,将其转换成数字寻呼信号,并且把数字寻呼信号提供给发射机240作为调制信号,以及一个传输控制电路223根据发送信号SS执行控制,选择性地提供存在接收缓冲器221中的寻呼请求信号,并且控制格式转换。 In FIG 3, the coding control unit 220 includes a receiving buffer 221, an input interface unit 210 receives the transmission start time assigning attached paging request code signal and temporarily stores it, a reference time pulse generator circuit 225 for generating a clock pulse and time information synchronized with the universal standard time based on the output of the GPS receiver 230, a coincidence circuit 222 for detecting the current time indicated by the reference time pulse and the reception buffer 221 requests paging signal coincidence between the time of the assignment and outputs a transmission signal SS, transmitting a data converter 224 for converting the format of the paging signal, converts it into a digital paging signal and supplies the digital signal to the paging transmitters 240 as modulated signal, and a transmission control circuit 223 performs control in accordance with the transmission signal SS, to selectively provide the receiving buffer 221 in the presence of a paging request signal, and controls the format conversion.

以下将参照数字寻呼信号为512BPS的POCSAG码的情况描述上述实施例的工作方式。 Digital paging signal will be described with reference to the working of the embodiment is the case of POCSAG code 512BPS.

参见图1和图2,寻呼控制器10不断地检查其PSTN接口单元110中是否有来自任一电话终端41(S1)的寻呼请求。 Referring to FIG. 2 and FIG, paging controller 10 constantly checks whether there is a PSTN interface unit 110 from any telephone terminal 41 (S1) a paging request. 如果接到一个电话,寻呼控制器就开始执行接收被呼叫的用户号码(S2)的操作。 If you receive a call, the paging controller starts the user performs an operation number (S2) of receiving calls. 在日本,当连接到PSTN的电话是一个长途接续电话时,被呼叫的用户号码通常是由一个MF(多频)信号构成的。 In Japan, when connected to the PSTN is a telephone trunk connection, the called subscriber number is usually (multi-frequency) signal composed of a MF. 接收到被呼叫的用户号码之后,排队处理器121用用户数据文件140(S3)进行核对,仅仅接受对已在用户数据文件中登记的被呼叫用户号码的寻呼请求。 After receiving the called subscriber number, a queue processor 121 collates the user data file 140 (S3), received only the called subscriber number to the paging request has been registered in the user data file. 如果被呼叫的用户被认定为用信息业务提供寻呼服务的成员之一(S4),就接收PB(按钮)信号的状态信息(S5)。 Status information (S5) if the called user is identified as one of the members to provide a paging service using service information (S4), on the reception of PB (push button) signal. 在这种方式下,陆续地接收多个寻呼电话请求信号,并将其累积在排队处理器121中,直至从排队定时器123收到定时信号TQ。 In this manner, a plurality of successively received pager request signal and which accumulated in the queue processor 121 until the timing signal 123 received from the queue timer TQ. 然后,排队处理器121产生一系列寻呼信号,其格式非常接近POCSAG码(S6)。 Then, the queuing processor 121 generates a series of paging signals, which is very close to the POCSAG format code (S6). (这种处理被称为排队)。 (This process is referred to queuing).

控制电路122每当收到具有预定时间间隔的定时信号TQ时,就对累积在排队处理器121中的寻呼接收信号进行格式转换,将其转换成寻呼请求信号的格式,在由基准时间脉冲发生电路125显示的当前时间上增加一个由延迟时间存储器124的输出显示的数据传输时间以及基地台一侧的接收和处理时间,在隔过由增加的结果表示的时间之后为寻呼请求信号附加一个作为传输起始时间的时间,然后通过输出接口单元130/131和传输线60/61把信号发送到基地台20/21。 Whenever the control circuit 122 receives a timing signal TQ having a predetermined time interval, it is accumulated in the queue processor 121 in the received paging signal format conversion, converts it into a signal format of a paging request, by the reference time reception and processing time increase data transmission time and the base station side to a memory output 124 by a delay time is displayed on current time display pulse generating circuit 125, after the elapsed time interval represented by the result of increased paging request signal additional time as a start time of transmission, and then transmitted to the base station via an output interface unit 20/21 130/131 60/61 and a signal transmission line.

寻呼请求信号的传输协议采用HDLC(高级数据链路控制规程)作为OSI的第二层,并且用图5所示的格式作为OSI的第七层。 Page request signal transmission protocol uses HDLC (High level data link control) as the second OSI layer, and a format shown in FIG. 5 as the seventh layer of the OSI. 在图5中,“TXNO”表示一个目标基地台的标识(ID)号码,“CHNO”是一个指示射频信道的信道号码,传输数据通过该信道发送,“CODE”表示被发送的传输数据的指定格式(例如对POCSAG512BPS为“01”),“TIME”是传输数据的传输起始时间赋值(例如在12点10分0秒时传输的情况下为“1000”),“TRNO”是一个事务号码,指示这一分组的ID号码,以及“TRL”是一个事务分组长度,表示这一分组的数据长度。 In FIG. 5, "TXNO" flag indicating a target base station (ID) number, "CHNO" is an indication of the RF channel of the channel number, transmission data transmitted through the channel, "CODE" represents the designated transmission data to be transmitted format (e.g. POCSAG512BPS as "01"), "tIME" is a transmission start time assigned to transmit data (e.g., at 12:10 transmission case 0 seconds "1000"), "TRNO" is a transaction number , indicating that the packet ID number, and "TRL" is a transaction packet length indicating a data length of the packet. 此外,对“POCS AG数据”来说,仅有21个信息比特被作为1个三字节的代码字传输,并且在基地台一边附加上一个奇偶校验位,一个报头及一个同步代码字(SC)。 In addition, "POCS AG Data", it is only 21 information bits as a three-byte code word transmission and on the side of a parity bit attached at the base station, a header and a synchronization code word ( SC). 采用这种方案,可以缩短通过传输线的传输时间。 With this arrangement, the transmission time can be shortened by the transmission line. 从以上的描述可以清楚地发现,按照本发明的的系统的特征是在上行的各个寻求请求信号中插入传输起始时间信息。 It is clear that from the above description, according to the characteristics of the system according to the present invention is to seek to respective uplink transmission request signal insertion starting time information.

各个基地台的ID号码编号系统是有选择的,从而不仅允许指定个别的基地台,而且可以允许同时指定一个组中或是所有的组中的所有基地台。 ID numbering system of each base station is selected, so that not only allows you to specify the individual base stations, but may be allowed to specify all the base stations in a group or all groups. 中央控制单元120选择一个对应一条传输线的ID号码以及一个基地台的状态,并且设定“TXNO”。 The central control unit 120 selects a state of the ID number of a transmission line and a corresponding base station, and sets "TXNO". “CHNO”在一个基地台具有多个射频信道时使用。 When using the "CHNO" having a plurality of radio frequency channels in a base station.

结合图1和3分析图6,作为“TXNO”的那个基地台20接收传输给它本身或所有基地台的一个寻呼请求信号,编码控制单元220把这一寻呼请求信号存储在用地址分段的接收缓冲器221中。 3 in conjunction with FIG. 1 and FIG. 6 analysis, as "TXNO" that base station 20 receives the transmission itself or to a paging request signal to all the base stations, the encoding control unit 220 with the signal stored in the paging request address points section 221 of the reception buffer. GPS接收机230向基准时间脉冲发生电路225提供一个重复周期为1秒的脉冲信号C3,和一个以串行数据方式相对于信号C3稍有延迟的时间信号C4。 GPS receiver 230 225 provides a reference time pulse generating circuit to the pulse repetition period of a signal of 1 second C3, and to a serial data signal with respect to time in a slight delay signal C3 C4. 基准时间脉冲发生器电路225装设有高稳定性石英振荡器226,以便根据来自GPS接收机230的信号C3/C4得到一个更精确的时间。 The reference time pulse generator circuit 225 mounted with a high stability crystal oscillator 226 according to a signal from the GPS receiver 230 C3 / C4 to obtain a more accurate time. 由于时间信号C4是稍迟于脉冲信号C3供给基准时间脉冲发生器电路225的,采用由先前收到的信号C4加上1秒所表示的时间作为脉冲信号C3的接收时间,就有可能使时间信号C4与通用标准时间同步。 Since the signal C4 is slightly later than the time the pulse signal C3 supplied to the reference time pulse generator circuit 225, using the time signal from the previously received C4 plus 1 sec as represented by the reception time of the pulse signal C3, it is possible that the time signal synchronized with the universal standard time C4. 基准时间脉冲发生器电路225为传输数据转换器224的每个比特提供一个时钟脉冲C1,并为每个代码字提供一个时钟脉冲C2,以便使数字寻呼信号格式,即传输格式数据DS逐个比特及逐个代码字地同步。 The reference time pulse generator circuit 225, each bit of the transmission data converter 224 provides a clock pulse C1, C2 and provides a clock pulse for each code word, so that the digital paging signal format, i.e. a transport format for the data bit by bit DS and the synchronization code word individually. 基准时间脉冲发生器电路225的时间信息还提供给重合电路222,重合电路222每收到一个脉冲信号C3就从来自接收缓冲器221的寻呼请求信号中的“TIME”区域读出一个传输起始赋值时间,将其与来自基准时间脉冲发生器电路225的现时时间指示脉冲相比较,并且在两个时间重合时把发送信号SS连同数据的存储地址一起输出给传输控制器223。 The reference time pulse generator circuit 225 also provides timing information to the coincidence circuit 222, a coincidence circuit 222 each receive a pulse signal C3 is read out from a transmission signal "TIME" area paging request from the receiving buffer 221 from assignment starting time, the current time with the time reference from the pulse generator circuit 225 is compared indication pulse, and the transmission signal SS stored along with the address data output to the transmission controller 223 together with the time when the two coincide. 传输控制器223把“POCSAG数据”区域内与上述地址对应的数据再提供给传输数据转换器224。 Transmit controller 223 "the POCSAG data" corresponding to the address area and the data is then provided to the transmission data converter 224. 传输数据转换器224与时钟脉冲C1和C2同步地操作,为输入的数字信号附加个奇偶校验位tp,进一步为数字信号加上一个报头和SC,把数据信号转换成传输格式数据DS,然后将其提供给发射机240作为调制信号。 The transmission data converter 224 operates in synchronization with a clock pulse C1 and C2, tp additional digital signal input parity bits, a digital signal plus a further header and SC, converting the data signal into the DS data transmission format, and then which is provided to the transmitter 240 as a modulation signal. 发射机240用来自传输数据转换器224的数字寻呼信号调制一个射频载波,并将其作为电磁波发送,从而使数字寻呼信号呼叫一个特定的寻呼机80。 The transmitter 240 a radio frequency carrier modulated with the digital paging signal from the transmission data converter 224, and transmitted as an electromagnetic wave, so that the digital paging signal 80 calling a specific pager. 由于基地台21与基地台20同样与通用标准时间同步地操作,就有可能把来自各个基地台的,作为调制信号的数字寻呼信号之间的相位差限制在1/4比特长度范围之内。 Since the base station 21 in the same manner in synchronism with the base station 20 with the universal standard time, it is possible to from each base station, a paging signal as between a digital modulation signal is limited to a phase difference of 1/4 bit length .

如上所述,在按照本发明的系统中,由各个基地台的GPS接收机产生相位比较的基准,在各个基地台之间可以保持调制信号的同步,而不受寻呼控制器(中央台)与各个基地台之间的传输线上的不同延迟时间的影响。 As described above, in the system according to the present invention, reference generating phase comparison by the GPS receiver of each base station, between the respective base stations can be synchronized modulated signal, without the paging controller (CCTV) influence of different delay times of the transmission line between the respective base stations.

参见图7所示的时序图,在时刻TO处,从中央台寻呼控制器10的输出接口单元130和131输出一个寻呼请求信号,该信号指定一个传输起始时间TS。 Referring to the timing chart shown in FIG. 7, at time TO, the central station from the paging controller unit 10 of the output interface 130 and 131 outputs a paging request signal that specifies a transmission start time TS. 经过一个传输延迟时间t1后,输出到传输线60的寻呼请求信号D1在时刻T1处被接收并暂存在基地台20中。 After a propagation delay time t1, the output line 60 to page transmission request is received and the signal D1 temporarily stored in the base station 20 at time T1. 经过一个传输延迟时间t2后,输出到传输线61的寻呼请求信号D2在时刻T2处被接收并暂存在基地台21中。 After a transmission delay time t2, the output transmission line 61 to the paging request signal D2 is received and temporarily stored in the base station 21 at the time T2. 在时刻Ts,基地台20和21分别通过信号格式转换形成数字寻呼信号,并且分别开始传输用这一个数字寻呼信号调制的射频载波。 Ts of, the base station 20 and 21 are formed by a digital paging signal format conversion timing signal, respectively, and starts transmission on this RF carrier modulated digital paging signal. 寻呼控制器10通过在现时时间(图7中的TO)上增加最大传输延迟时间(图7中的t2)及基地台的数字接收和处理时间(图7中的tp)来指定传输起始时间TS。 The paging controller 10 specifies the transmission start by increasing the current maximum transmission time on (TO in FIG. 7) to receive and process digital delay time (t2 in FIG. 7) and the base station (tp in FIG. 7) time TS. 如果把本发明用于由呼叫者在呼叫时刻指定一个传输时间的系统(参见日本公开59-85147),就应该比指定时间TS提前t2和tp之和的时间从寻呼控制器输出寻呼请求信号。 If the present invention is used to specify a transmission time of a call by a caller the system time (see Japanese Publication 59-85147), it should advance than the specified time t2 and tp TS sum of the output time of a paging request from the paging controller signal.

图8是本发明第二实施例的电路框图,其中所发射的两个射频载波具有不同的频率。 FIG 8 is a circuit block diagram of a second embodiment of the present invention, wherein two radio frequency carriers having different frequencies emitted. 图8所示的第二实施例具有这样的结构,即,把图1所示实施例中的基地台20和21换成各自具有上述不同射频载波的基地台30和31。 The second embodiment illustrated in FIG. 8 has a structure, i.e., the embodiment illustrated in FIG 1 the base station 20 and 21 each replaced by a different radio frequency carriers having the above-described base stations 30 and 31. 在图8中,基地台30具有编码控制单元220和320及发射机240和340,分别对应用于两个射频载波的无线电信道CH1和CH2。 In Figure 8, the base station 30 having the encoding control unit 220 and the transmitter 320 and 240 and 340, respectively applied to the two RF carrier radio channels CH1 and CH2. 这些构造器件的结构和功能分别与图1所示第一实施例中的编码控制器220和发射机240完全相同。 The structure and function of the device configuration of the embodiment, respectively, and the encoding controller 220 and the transmitter 240 shown in FIG. 1 a first embodiment is identical. 同样,采用与图1中相同标号的其它器件的结构和功能也分别与图1中的器件相同。 Similarly, structure and function with the same reference numerals as in FIG. 1 are also other devices are the same device 1 in FIG.

以下描述本实施例的操作方式。 The following description of the operation of the present embodiment. 当中央控制单元120接收到来自PSTN40中的一个电话终端41的寻呼电话时,它就按照图4的流程执行排队处理程序。 When the central control unit 120 receives a call from a terminal in the paging telephone PSTN40 41, it performs processing program according to the flow line 4 in FIG. 另一方面,使多个寻呼接收机80和81(图中仅示出了两个)各自对准一个无线电信道CH1或CH2,并且把这一传输信道号码信息与用户号码相对应地存储用户数据文件140中。 On the other hand, a plurality of paging receivers 80 and 81 (only two shown) are each aligned with a radio channel CH1 or CH2, the transmission channel and the number corresponding to the subscriber number information stored in a user data file 140. 在中央控制单元120执行排队处理程序时,它根据用户数据文件140来确认被呼叫用户的登记号码,并将其分配给每个指定的无线电信道,然后执行排队处理程序。 When the central control unit 120 executes queue processing program, it was confirmed according to the called user data file 140 of the user registration number, and assign it to each of the specified radio channel, and then performs the queuing processing program. 中央控制单元120响应定时信号TQ,顺序地为每个无线电信道产生寻呼请求信号(见图5),并通过传输线60/61把它们发送到基地台30/31。 The central control unit 120 in response to a timing signal TQ, sequentially generates a paging request signal (see FIG. 5) for each radio channel, and sends them to the base station through the transmission line 30/31 60/61. 在各个基地台30/31中,识别出由输入接口单元210收到的寻呼请求信号中“CHNO”区域内的无线电信道号码,如果是无线电信道CH1,就将其传送给编码控制单元220,如果是信道CH2,就传给编码控制器320。 In each of the base stations 30/31, identified "CHNO" radio channel number in the area of ​​the paging request signal from the input interface unit 210 receives, if the radio channel CH1, which will be transmitted to the encoding control unit 220, If the channel CH2, the encoding controller 320 would pass. 对应无线电信道CH1的编码控制单元220及发射机240与对应无线电信道CH2的编码控制单元320及发射机340相互独立地工作,并且可以在指定的时间分别呼叫寻呼接收机80/81。 Radio channel CH1 corresponding to the encoding control unit 220 and transmitter 240,340 independently of one another radio channel CH2 corresponding to the coding control unit 320 and a transmitter and receiver may each call page 80/81 at a specified time. 在寻呼控制器10和基地台30/31中用于根据来自GPS接收机150/230的信号精确计算现时时间的装置与图1所示的实施例中相同。 For the same according to embodiment 1 of the present embodiment shown in the time signal from the GPS receiver to accurately computing device 150/230 in FIG paging controller 10 and the base station of 30/31.

图9表示本实施例中寻呼请求信号各个部分的输入及输出与数字寻呼信号之间的时间位置关系。 FIG 9 showing the present embodiment, the positional relationship between the paging request the time of the input and output signals of the respective portions of the digital paging signal. 在图9中,分别从时刻TO1和TO2起依次由输出接口单元130向同一条传输线60发送一个为无线信道CH1指定了传输时间TS1的寻呼请求信号D11和一个为无线信道CH2指定了传输时间TS2的寻呼请求信号D12,经过t1的延迟,基地台30分别在时刻T11和T12接收这两个信号。 In FIG. 9, from time TO1 and TO2 are sequentially transmitted by the output interface unit 130 with a transmission line 60 to the transmission time specified for radio channel CH1 TS1 paging request signal D11 and the transmission time specifies a radio channel CH2 TS2 paging request signal D12, after a delay of t1, the base station 30 at time T11 and T12, respectively, receive the two signals. 基地台30的编码控制单元220在时间TS1转换信号D11的格式,为信道CH1形成一个数字寻呼信号。 Encoding control unit 30 base station 220 at the time of the switching signal TS1 D11 format, a digital paging signal forming a channel CH1. 即使无线信道CH1上的信号继续传送,编码控制单元320在时间TS2转换信号D12的格式,为信道CH2形成一个数字寻呼信号。 Even if the signal continues to transmit on a wireless channel CH1, the encoding control unit 320 at time TS2 signal D12 format conversion, digital paging signal forming a channel CH2. 信号D11/D12在时刻TO1/TO2处还从寻呼控制器10的输出接口单元131提供给传输线61,并且经过一个与t1不同的延迟之后由基地台31接收。 Signal D11 / D12 at the timing at TO1 / TO2 is also provided from the output interface unit 131 of the paging controller 10 to the transmission line 61, and after a different delay t1 and received by the base station 31. 当然,在无线信道CH1和CH2上,这些寻呼信号的发射起始时间分别与基地台30的寻呼信号同步。 Of course, in the radio channel CH1 and CH2, the emission start time of the paging signal a paging signal is synchronized with the base station 30, respectively.

如上所述,即使多个无线信道发出的寻呼信号在时间上是重叠的,也有可能以分时的方式在一条传输线上传送这些寻呼信号,因为在寻呼控制器10与各个基地台30/31之间通过传输线传送的寻呼请求信号上附加了传输起始时间赋值码,所以此处就不必增加传输线的数量。 As described above, even if the paging signal a plurality of radio channels sent overlap in time, it is also possible to transmit these time-sharing manner in a paging signal transmission line, because the paging controller 10 and respective base station 30 paging between / through the transmission line 31 transmits a request for additional transmission start time assigning code to the signal, so here it is not necessary to increase the number of transmission lines. 当然,一条传输线上的寻呼请求信号的比特率应该是其传输格式的N(无线信道的数量)倍。 Of course, a paging request transmission line bit rate signal which should be the transport format N (radio channel number) times. 然而,这样做有可能相应地增加分时多路复用率。 However, doing so it is possible to correspondingly increase the rate of time division multiplexing. 例如对512BPS POCSAG码的情况,如果传输线上的寻呼请求信号的比特率为9600BPS,就有可能复用至少10个信道。 For example, the case 512BPS POCSAG code, if the paging request bit rate of the transmission line 9600BPS signal, it is possible to reuse at least 10 channels.

图10表示本发明的第三实施例,其中除了对寻呼控制器11与基地台20/21之间的传输线做了修改之外,其他部分均与有关的实施例中相同。 FIG 10 shows a third embodiment of the present invention, wherein in addition to the transmission lines between the paging controller 11 20/21 with the base station has been modified, the other portions are the same as in connection with the embodiment. 在图10中,一条传输线70以多点的方式连接在寻呼控制器11的一个输出接口单元130与多个基地台20/21的相应输入接口单元210之间。 In FIG. 10, a transmission line 70 to the multi-way paging controller connected between an output interface unit 11 a plurality of base stations 130 and respective input interface unit 210 20/21. 当一个寻呼请求信号从寻呼控制器11被传送到传输线70上的时候,“TXNO”可以指定给所有的基地台。 When a page request signal from the paging controller 11 is transmitted to the transmission line 70, "TXNO" can be assigned to all the base stations. 然而,在这种情况下,在寻呼控制器11一边可能很难确认多个基地台是否正常地接收信号。 However, in this case, the paging controller 11 while a plurality of base stations may be difficult to identify whether the received signal normally. 这是因为来自各个基地台20/21中表示寻呼请求信号正常接收的确认信号(ACK)相互抵触。 This is because from the respective base stations 20/21 indicating a paging request acknowledgment signal (ACK) signal is received normally conflicting. 为解决这一问题,把寻呼请求信号分别传送给基地台20/21,如图11所示。 To solve this problem, the paging request signal is transmitted to the base station 20/21 respectively, as shown in FIG. 寻呼控制器11在时间TO3传送一个寻呼请求信号D3,在其“TX NO”区域赋予一个指定给基地台20的ID号码(TX1),然后在时间TO4传送一个寻呼请求信号D4,为其赋予一个指定给基地台21的ID号码(TX2)。 Paging controller 11 transmits a paging request at time TO3 signal D3, assigned to a given ID number (TX1) of the base station 20 in its "TX NO" region, and then transmits a paging request signal D4 at time TO4, is its ID number assigned to a given (TX2) base station 21. 分别经过传输延迟时间t3和t4之后,基地台20/21在时间T3和T4接收到信号D3和D4。 After each transmission delay time t3 and t4, the base station at time T3 and T4 20/21 received signal D3 and D4. 因此,各个基地台20/21可以分别在不同的时间发回ACK信号。 Accordingly, the respective base stations 20/21 may each send back the ACK signal at different times. 当然,需要把传输起始时间TS3设置在所有基地台都完全接收到寻呼请求信号的时间T5之后。 Of course, it is necessary to set the transmission start time TS3 after time T5 all the base stations are fully receives the paging request signal. 在这个系统中,通过传输线70传送的寻呼请求信号的比特率必须是一个基地台中寻呼信号比特率的M倍,此处的M是所连接的基地台数量(在图10中M=2)。 In this system, the bit rate of the paging request signal is transmitted through the transmission line 70 must be a base station is M times the bit rate of the paging signal, where M is the number of base stations are connected (in FIG. 10, M = 2 ). 然而,这样做有可能相应地增加分时多路复用率。 However, doing so it is possible to correspondingly increase the rate of time division multiplexing. 例如在512BPS POCSAG码的条件下,如果传输线上寻呼请求信号的比特率为9600BPS,就有可能在一条传输线上连接至少10个基地台。 512BPS POCSAG code, for example, under the conditions, if the bit rate of the transmission line 9600BPS paging request signal, it is possible to connect the base station 10 at least one transmission line.

图12表示本发明的第四实施例,它具有树形连接构造,其中在一条传输线内设有一个用于中继/分配寻呼信号的信号分配器50,以便适应寻呼控制器11与各个基地台20/21之间距离的增加。 FIG. 12 shows a fourth embodiment of the present invention, which has a tree structure is connected, a transmission line which features a dispenser for signal relaying / 50 allocation of the paging signal, the paging controller 11 to accommodate the respective increasing the distance between the base station 20/21. 在图12中,信号分配器50包括一个联接到来自寻呼控制器11的传输线71上的输入分配单元510,用于接收和分配寻呼请求信号,以及输出单元520和521,它们用于把输入分配单元510所分配的各个寻呼请求信号分别经由传输线72和73输出给基地台20和21。 In Figure 12, the dispenser 50 includes a signal input coupled to the allocated transmission line 11 from the controller 71 of the paging unit 510, for receiving and allocating a paging request signal, and an output unit 520 and 521, are used to input assigned assignment unit 510, respectively, via respective paging request signal 73 and output transmission lines 20 and 72 to the base station 21. 在本实施例中,也可能象图10所示的实施例一样,相对于基地台的数量减少传输线的数量。 In the present embodiment, like the embodiment may also be illustrated as in FIG. 10, with respect to the number of base stations to reduce the number of transmission lines.

如上文所述,按照本发明的无线寻呼系统在寻呼接收机收到调制射频载波时能防止相邻基地台输出信号之间的干扰,这是因为在构成射频载波调制信号的数字寻呼信号上附加了一个传输起始时间信息,这是一方面,另一方面,在每个基地台中使用来自GPS卫星的很高精确度时间信息作为时间基准,在用它指定的一个时刻处用寻呼信号同步地调制多个相同频率的射频载波。 As described above, the radio paging system according to the present invention can be prevented in the paging receiver receives the output signal interference between adjacent base stations when the modulated radio frequency carrier, which is configured as a digital paging signal modulated RF carrier signals appended to a transmission start time information, which is on the one hand, on the other hand, using high precision time information from the GPS satellites in each base station as a time reference, with which at the time specified by a seek call signal modulated RF carrier synchronization plurality of the same frequency. 此外,由于在寻呼控制器与各个基地台之间的寻呼信号传输线可以实现多点连接,树形连接或星形连接以及它们的任意组合连接方式,就有可能获得相位同步,从而实现多个基地台的同步传输,并且相应地节省传输线数量,以及由此降低其费用。 Further, since the paging signal transmission line between the base station each paging controller may be implemented with multi-point connection, star connection or a tree connection, and any combination thereof connections, it is possible to obtain the phase synchronization, to achieve multi- a base station synchronous transmission, and accordingly to save the number of transmission lines, and thus reduce its cost.

在图3中应该注意到,如果不能获得来自GPS接收机230的时钟脉冲和时间信息,各个基地台的基准时间脉冲发生器电路225就由高稳定石英振荡器226控制。 It should be noted in FIG. 3, if the clock can not be obtained from the GPS receiver and the time information 230, the reference time pulse generator circuit 225 to the respective base stations are controlled by a highly stable crystal oscillator 226. 如果比特率为9600BPS,振荡器226可以采用稳定性为0.01PPM或更小的石英振荡器。 If the bit rate is 9600BPS, the oscillator 226 may be employed 0.01PPM stability crystal oscillator or less. 如果寻呼信号的比特率低于9600BPS,石英振荡器的稳定性要求可以降低。 If the bit rate stability requirements paging signal is lower than 9600BPS, the crystal oscillator can be reduced. 除了使用这种自动的石英振荡器,也可以提供一个备用装置,利用传输线的同步时钟脉冲来产生一个与GPS接收机的时钟相位同步的时间脉冲,也可以利用电视广播波或一个标准波,例如JJY。 This automatic except that a quartz oscillator, a backup device can also be provided using the synchronous clock transmission line to generate a clock pulse synchronized to a temporal phase with the GPS receiver may also use a standard television broadcast wave or waves, e.g. JJY. 在此情况下,与GPS接收机同步之后由备用装置维持同步。 In this case, after the synchronization is maintained by the backup device and the GPS receiver synchronization. 同样的方法也适用于图2中寻呼控制器的基准时间脉冲发生器电路125。 The same approach also applies to the reference time pulse generator circuit 125 in FIG. 2 paging controller. 此时,电路125的稳定性相对于基地台一边可以较低。 In this case, stability of the circuit 125 may be lower side with respect to the base station. 因此,可以在没有GPS接收机150的情况下采用具有这种备用装置的基准时间脉冲发生器电路。 Thus, the GPS receiver can be used without a reference time pulse generator circuit having such a backup device in case of using 150.

Claims (3)

1.一种全球寻呼系统,用于为分布在多个基地台的覆盖区域内的多个寻呼接收机提供寻呼服务,该系统包括一个寻呼控制器,响应一个经公用电话交换网(PSTN)接收到的来自其中一个用户的寻呼电话,产生一个寻呼请求信号,该信号包含被呼叫的上述寻呼接收机持有者的用户号码,以及上述多个基地台通过多条具有不同传输时间的传输线连接到上述寻呼控制器上,并且分别产生具有相同频率,并且由对应上述寻呼请求信号的一个数字寻呼信号同步地调制的射频载波,该寻呼系统的特征在于:上述寻呼控制器包括:一个延迟时间存储器,用于预先存储一个等于上述传输线上不同传输时间的最大值的第一时间值,以及供上述各个基地台从接收上述寻呼请求信号到产生上述数字寻呼信号所需的第二时间值;第一GPS接收机,响应从多个NAVSTAR GPS(全球定位系统) A global paging system for providing paging services for a plurality of paging receivers distributed within the coverage area of ​​the plurality of base stations, the system comprises a paging controller responsive to a public switched telephone network via (PSTN) received from one of the pager user, generates a page request signal, the signal including the paging receiver holder of the called subscriber number, and said plurality of base stations having a plurality of through different time transmission line connected to said paging controller, having the same frequency and respectively generate, and corresponding to said paging request from the paging signal a digital modulated RF carrier signal in synchronism, characterized in that the paging system: the paging controller comprising: a delay time memory for previously storing a first time value equal to the maximum value of the different transmission times of said transmission lines, and for each of the above-described base station receives the request signal from the paging generating the digital time value required for the second paging signal; a first GPS receiver, a plurality of responses from the NAVSTAR GPS (global positioning system) 星接收到的信号,产生时间基准信号;第一时间基准电路,响应上述时间基准信号,产生与通用标准时间具有确定时间关系的高精确度时间信号;以及编码附加装置,用于在一个时刻之后为上述寻呼请求信号附加一个作为传输起始时间赋值码的表示时间的代码,上述时刻是通过在现时时间上加上第一时间值与第二时间值之和所获得的;以及每个上述基地台包括:一个接收缓冲存贮装置,用于接收并且暂时存储上述寻呼请求信号;一个第二GPS接收机,响应来自上述GPS卫星的信号,产生上述时间基准信号;一个第二时间基准电路,响应上述时间基准信号,产生与通用标准时间具有确定时间系统的高精确度时间信号;一个重合电路用于检测在上述接收缓冲存贮装置中计算出的上述寻呼请求信号的传输起始时间赋值码与来自上述第二时间基准电路的上述 Star received signal, generating a time reference signal; a first time reference circuit responsive to said time reference signal is generated with the universal standard time having a high precision time signal determined temporal relationship; and additional encoding means, for a time after attached to said paging request signal as a transmission start time code indicates the time code assignment of the time in the current time by adding a first time and the second time value and the obtained value; and each of said the base station comprising: a receiving buffer memory means for receiving and temporarily storing said paging request signal; a second GPS receiver, in response to a signal from the GPS satellite, said time reference signal is generated; a second time reference circuit responsive to said time reference signal, generating a high precision time signal and the universal time standard time of the system has determined; a coincidence circuit for detecting a transmission start time of the paging receiver calculated in said buffer memory means request signal the above-described code assignment from said second time reference circuit 精确度时间信号之间的重合性;一个格式转换电路,用于执行格式转换,从上述重合电路产生一个重合输出信号的时刻起把上述寻呼请求信号的格式转换成与来自上述第二时间基准电路的上述高精确度时间信号同步的上述数字寻呼信号;以及一个无线电发射机,用于产生一个具有预定频率并且用上述数字寻呼信号调制的射频载波。 The accuracy of the coincidence between the time signal; a format conversion circuit for performing format conversion, generates a timing signal from said coincidence output from the coincidence circuit converts the format to said paging request signal from said second time reference and It said high precision time signal synchronization circuit in the digital paging signal; and a radio transmitter, for generating a predetermined frequency and having a paging signal with the digital modulated RF carrier.
2.按照权利要求1的寻呼系统,其特征在于上述第二时间基准电路包括一个高稳定性石英振荡器,它响应来自上述第二GPS接收机的上述时间基准信号,产生一个为上述数字寻呼信号的每个比特规定时间位置的时钟脉冲,并且即使在上述时间基准信号被中止时仍维持产生上述时钟脉冲。 2. The paging system as claimed in claim 1, wherein said second time reference circuit comprises a high-stability crystal oscillator, responsive to said time reference signal from said second GPS receiver, said digital to generate a hunt call each bit clock signal of a predetermined time position, and generating said clock pulses remains even at the time when said reference signal is aborted.
3.按照权利要求1或2的寻呼系统,其特征在于上述射频载波包括多个具有不同的载波,其中的每个上述寻呼接收机可以接收不同的一个上述载波,其中上述寻呼控制器包括对应上述各个载波的上述编码附加装置,上述寻呼请求信号的比特率等于上述数字寻呼信号的比特率与上述载波数量的乘积,其中的每个基地台均包括相同数量的设备,每个设备均包括上述接收缓冲存贮装置,其中的上述格式转换电路和上述发射机的数量对应上述载波的数量,并且在由对应上述各个载波的上述寻呼请求信号中的上述时间赋值码指定的传输起始时间,从上述基地台发射上述载波。 3. The paging system as claimed in claim 1 or 2, wherein said radio frequency carrier includes a plurality of carriers having different, wherein each of said paging receivers can receive different one of said carrier, wherein the paging controller the coding means including additional carriers corresponds to each of the above, the bit rate of the paging request signal is equal to the product of the carrier bit rate and the number of the digital paging signal, wherein each base station comprises the same number of devices, each the receiving apparatus comprises buffer storage means, wherein the number of format conversion circuits and said transmitter correspond to the number of the carriers, and said time code signal assignment specified by the transmission of paging requests corresponding to the above-described respective carrier start time, the transmission of the carrier from the base station.
CN 93101572 1993-02-26 1993-02-26 Radio paging system having a plurality of transmitter stations CN1028946C (en)

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US5845214A (en) * 1995-12-28 1998-12-01 Samsung Electronics Co., Ltd. Device for transmitting paging data and method therefor
FR2838267B1 (en) 2002-04-09 2004-05-14 France Telecom telecommunication system via a main network as the Internet and a cable terminal to a geographically relevant routing communications
US20050141648A1 (en) 2003-12-24 2005-06-30 Microchip Technology Incorporated Time signal peripheral
US8279908B2 (en) * 2008-12-31 2012-10-02 Ibiquity Digital Corporation Synchronization of separated platforms in an HD radio broadcast single frequency network

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CN101088236B (en) 2004-10-26 2012-01-04 诺基亚公司 System and method for synchronizing a transport stream in a single frequency network

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