JPH03162142A - Automatic phase adjusting system - Google Patents

Abstract

PURPOSE:To execute the phase adjustment being suitable for a new signal transmission path in a short time by reading out the phase correction quantity from a memory area corresponding to the new signal transmission path at the time point when switching of the signal transmission path from a master station is detected, and setting it to a phase adjusting part. CONSTITUTION:The system is provided with a storage part 3 for storing the phase correction quantity corresponding to each of signal transmission paths l0, l1 from a master station, and whenever the phase adjustment is executed, the phase correction quantity corresponding to the signal transmission path from the master station in the storage part 3 is updated. On the other hand, at the time point when it is detected that the signal transmission path from the master station is switched, the phase correction quantity corresponding to the signal transmission path connected newly is read out of the storage part 3 and set to a phase adjusting part 4. In such a way, a phase of a call signal can be adjusted quickly without waiting for the next phase adjustment request from the master station, and the service can be offered without generating the deterioration of a receiving rate of a moving machine caused by a shift of the phase of the call signal radiated from a base station.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an automatic phase adjustment method in a radio paging system, and in particular, the present invention relates to an automatic phase adjustment method in a radio paging system, and in particular, a slave station selects one from a plurality of signal transmission paths between it and a master station, and The present invention relates to an automatic phase adjustment method in a radio paging system configured to connect to a base station.

[Conventional technology]

In a part of an area in a radio paging system where the strength of radio waves from a plurality of transmitters is approximately the same, the received field strength usually becomes small due to a phase shift between the paging signals from each transmitter. For this reason, the reception rate of mobile devices being called in this area is poor. As a means to prevent this, an automatic phase adjustment method is used to align the phases of the calling signals from each transmitter. This method can prevent a drop in reception rate even in areas where the strength of radio waves from multiple transmitters is about the same.

In a radio paging system that has the function of aligning the phases of the paging signals as described above, the device that has the function of creating or transmitting the paging signal is the master station, and the device that has the function of receiving the signal sent by the master station and adjusting the phase is used. A device with a transmitter that transmits a signal whose phase has been adjusted by the slave station using radio waves is called a base station. FIG. 3 shows the general connection relationship between these stations.

Automatic phase adjustment in the radio paging system having the configuration shown in FIG. 3 has conventionally been performed as follows.

First, determine the base station of the transmitter whose phase is to be adjusted. Here, consider base station C1 and base station C2. next,
The master station A outputs a control signal to turn on the transmission power of the base station C1. Following this control signal, a certain predetermined bit string is output. This bit string is radiated into space from the base station C1 via the slave station BO, and is received by the receiver R1 located in an area where the radio waves from the base station C1 and the radio waves from the base station C2 are of the same strength. , returns to the slave station BO. The slave station BO compares the phases of the bit string from the master station A and the bit string from the receiver R1 to determine the amount of delay. After sending out this bit string repeatedly,
A control signal is output to the base station C1 to turn off the transmission power.

Similarly, for the base station C2, the transmission power is turned on, a specific bit string is emitted, the slave station B1 receives it through the reception fiR1, and its delay scene is determined.

The phase correction amount is calculated from the difference in the delay amount obtained for each of the base stations Cl and C2, and the phase correction amount is applied to the base station C1.
Set in the phase adjustment section in the slave station BO connected to. In this way, the phase of the signal radiated from the base station C1 can be matched to the phase of the signal radiated from the base station C2. By sequentially performing similar phase adjustment on other base stations, it is possible to perform phase adjustment on all base stations. This phase adjustment is performed periodically at fixed time intervals.

Incidentally, the signal transmission path connecting the master station and the slave stations is generally duplicated. The reason for this is that if there is no signal transmission path that can be switched when a failure occurs, the paging signal will not be sent to the base station under the slave station, and the serviceability of the system will be greatly impaired. Consider phase adjustment when the signal transmission path between the master station and the slave station is duplicated in this way. The signal from master station A is transmitted through signal transmission path l. It passes through O+101+110+111 and is sent to slave station BO and slave station Bl, respectively. Child station B
At O, the signal transmission path l. Either 0 or 101 is selected and distributed to the subordinate base stations CO and C1. Child station B1
But it's the same. As an example, assume that signal transmission paths 101 and 110 are selected. The phase correction amount set in the phase adjustment section of slave station BO and slave station B1 is determined by the signal transmission path 10.
1 and l1o.

Here, consider a case where the route of the signal transmission path 110 is changed to the signal transmission path Ill for some reason. The value set in each phase adjustment section is the signal transmission path l. Since the values are optimized to 1 and 110, when the signal transmission path 1tt is used, the phase of the paging signal radiated from the base station C1 and that of the base station C2 are not necessarily transmitted in the same phase. Because signal transmission path 1 10 and 111
This is because the amount of delay is generally different. On the other hand, phase adjustment is performed by sequentially specifying the transmitters of each base station, and adjustment is performed for all transmitters. In this case, the phases between base stations Cl and C2 are not aligned until the phase adjustment between base station C1 and base ZC2 is completed after the signal transmission path is switched from lto to 1st. As a result, this opening base station Cl. In a part of the area between C2, there is a possibility that the strength of the received signal 4 becomes small, and the reception rate of the mobile device decreases.

[Problem to be solved by the invention]

As mentioned above, in the conventional automatic phase adjustment method, even if the signal transmission path from the master station changes, the phase correction amount set in the phase adjustment section remains the same, so the signal transmission between the master station and slave stations is Depending on the difference in the amount of delay in the path, the paging signal may be emitted with a phase shift. Since this state continues until the next phase adjustment is completed, there is a problem in that the reception rate of the mobile device deteriorates for a long time. [Means for Solving the Problems] The automatic phase adjustment method of the present invention includes a master station, and when the output signal of the master station is analyzed and it is detected that the own station has been designated, the output signal of the master station is adjusted. a plurality of base stations that radiate into space as radio waves, and a wireless receiver that outputs the received output signal of the master station located in an area where two of the radio waves radiated by these base stations have the same strength. , an output signal of the master station having a plurality of signal transmission paths between it and the master station, having at least one of the base stations under its control, and inputted through one selected from the signal transmission paths; A phase correction amount is calculated for each of the subordinate base stations from the phase difference between the phase adjustment signal included in the phase adjustment signal and the phase adjustment signal input from the receiver, and the phase correction amount is calculated for each of the subordinate base stations. automatic phase adjustment, comprising: a slave station that is set in a phase adjustment unit and outputs the output signal of the master station inputted from the signal transmission path after correcting the phase of the output signal of the master station using the phase adjustment ridge corresponding to each of the subordinate base stations; In the method, the slave station includes a storage unit that stores the phase correction amount for each of the signal transmission paths and each of the subordinate base stations, and monitors which of the signal transmission paths is selected. and a signal transmission path monitoring unit that reads out the phase correction amount corresponding to the newly selected signal transmission path from the storage unit when the signal transmission path monitoring unit detects that the signal transmission path has been switched. and a control section for setting the phase adjustment section. The storage section included in the slave station provided in the automatic phase adjustment system of the present invention is divided into RAM, and the storage area of this RAM is divided into areas corresponding to each of the signal transmission paths, and each of these divided areas is may be divided corresponding to each of the subordinate base stations.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one slave station in an embodiment of the present invention. The slave station shown in FIG. 1 is a slave station of the radio paging system generally shown in FIG. 3, and is connected to a master station through two signal transmission paths l. ．． l1
It is assumed that the base station is connected by , and has three base stations under it. 1 is the signal transmission path 1 from the master station. , 1, and 2 selects one of them and connects it to the signal transmission path to the subordinate base station, and 2 selects one of the signal transmission paths 1. . , l1; 4 is a phase adjustment unit that is given a phase correction amount and delays the phase according to the value; 5;
compares the phase of the direct signal from the master station and the signal returned from the receiver that receives the signal radiated into space (receivers RO, Rl, R2, etc. in Figure 3) and calculates the amount of delay. Delay measurement section 6 is a control section that controls each of the above sections. Storage unit 3 is stored in RAM.
FIG. 2 is a diagram for explaining the memory area of the storage section 3. As shown in FIG.

Since there are two signal transmission paths with the master station, the storage section 3
The memory area of is roughly divided into two parts. Reference numerals 10, 11, and 12 in one of them are memory areas for storing the phase correction amount corresponding to the signal transmission path lo. In the slave station shown in FIG. 1, there are three phase adjustment units 4 corresponding to the three subordinate base stations, so the slave station is divided into three memory areas.

20, 21, and 22 are memory areas for storing phase correction amounts corresponding to signal transmission path ll, which are divided into three memory areas for the same reason. The control section 6 constantly monitors which signal transmission paths are connected through the signal transmission path monitoring section 2. When the signal transmission path 10 is connected, the memory areas 10, 11, 12 are updated each time phase adjustment is performed, and at the same time, a phase correction amount is set in each phase adjustment section 4. Signal transmission path 1l
is connected, the memory areas 20, 21, and 22 are updated, and at the same time, the phase correction amount is set in each phase adjustment section 4. When the signal transmission route from the master station is switched from 10 to It, the control unit 6 immediately recognizes the change from the signal transmission route monitoring unit 2 and determines which signal transmission route the switch has been made to. Since the signal transmission path l1 has now been switched, the phase correction amounts are read out from the memory areas 20, 21, and 22 corresponding to the signal transmission path l1, and set in each phase adjustment section 4. onwards,
Until the signal transmission path is switched, the phase correction amount is set in the phase adjustment section 4 and the memory areas 20, 21, and 22 are updated each time the phase adjustment is performed. Conversely, if the signal transmission path is 1. When switching from to lo, memory area 1
The phase correction amount is read from 0, 11, and 12, and set to each phase adjustment section 4. From then on, until the signal transmission path is switched,
At the same time as setting the phase correction amount in the phase adjustment section 4, the memory areas 10, 11, and 12 are updated.

In this way, when the switching of the signal transmission path from the master station is detected, the phase correction amount is read from the memory area corresponding to the new signal transmission path and set in the phase adjustment section 4, thereby changing the signal transmission path to the new signal transmission path. The phase adjustment suitable for the can be made in a short time. [Effects of the Invention] As explained above, the present invention has a storage section that stores phase correction amounts corresponding to each signal transmission path from the master station, and each time phase adjustment is performed, the amount of phase correction from the master station is stored in the storage section. While updating the phase correction amount corresponding to the signal transmission path, when it is detected that the signal transmission path from the master station has been switched, the phase correction amount is read from the phase correction amount storage unit corresponding to the newly connected signal transmission path and the phase is updated. By setting this in the adjustment section, it is possible to quickly adjust the phase of the paging signal without waiting for the next phase adjustment request from the base station. This has the effect of being able to provide services without reducing the reception rate.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one slave station in an embodiment of the present invention, FIG. 2 is a diagram for explaining the memory area of the storage unit 3 in FIG. 1, and FIG. 3 is a general diagram of a wireless paging system. This is a diagram showing the configuration. 1... Signal transmission path switching section,
2...Signal transmission path monitoring unit, 3...Storage unit, 4...
・Position adjustment unit, 5... Delay measurement unit, 6... Control unit,
l. , 1, . . . signal transmission path.

Claims (2)

[Claims] (1) A master station, a plurality of base stations that radiate the output signal of the master station into space as radio waves when it analyzes the output signal of the master station and detects that its own station has been designated, and these base stations A plurality of signal transmission paths are provided between the base station and a radio receiver that is placed in an area where the strengths of two of the radio waves radiated by the base station are the same and outputs the received output signal of the base station. The base station has at least one of the base stations under its control, and the phase adjustment signal included in the output signal of the master station input via one selected from the signal transmission paths and the phase adjustment signal input from the receiver. The phase correction amount is calculated for each of the subordinate base stations from the phase difference with the phase adjustment signal, and is set in the phase adjustment section corresponding to each of the subordinate base stations, and the phase correction amount is input from the signal transmission path to the parent base station. In the automatic phase adjustment method, the slave station outputs the output signal of the station after phase correction by the corresponding phase adjustment section to each of the subordinate base stations. a storage unit that stores data for each of the transmission routes and each of the subordinate base stations; a signal transmission route monitoring unit that monitors which of the signal transmission routes is selected; and the signal transmission route monitoring unit and a control section that reads out the phase correction amount corresponding to the newly selected signal transmission path from the storage section and sets it in the phase adjustment section when it is detected that the signal transmission path has been switched. Features automatic phase adjustment method. (2) The storage section is constituted by a RAM, and this RAM
2. The automatic phase adjustment system according to claim 1, wherein the storage area of is divided into areas corresponding to each of said signal transmission paths, and each of these divided areas is divided corresponding to each of said subordinate base stations.