JPH04119030A - Active/standby data changeover system in mobile communication system - Google Patents

Abstract

PURPOSE:To match phases of transmission data of both lines in the case of changeover of active and standby lines by adjusting a phase of a clock outputted from a delay adjustment means of a line to be changed over so as to be in matching with a phase of a clock of the other line. CONSTITUTION:A reference clock changeover means 223 receives a reference clock from a delay adjustment means 120 of active/standby outgoing signal processing sections 41Aa, 41Ab and a clock to be adjusted and gives the reference clock to an in-bit phase difference detection section 208. An input clock changeover means 220 selects a loopback clock from peripheral base stations 601-60m or the clock to be adjusted from the reference clock changeover means 223 and gives the selected clock to the in-bit phase difference detection section 208. A reference multi-frame changeover means 222 receives an active frame, an active multi-frame, a standby frame, a standby multi-frame outputted from a timing generating section 103 of the active/standby outgoing signal processing sections 41Aa, 41Ab and gives the reference frame and the reference multi-frame to an inter-bit phase difference detection section 209.

Description

[Detailed Description of the Invention] Table of Contents Overview Industrial Field of Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems Implementation Examples Outline of the Effects of the Invention Current Use/Backup in Mobile Communication Systems Regarding the data switching method, by mutually switching between the working and standby communication paths without blocking the subscriber line, it is possible to switch between the working and standby data, thereby providing smooth communication services. The purpose of this system is to provide a working/protection data switching system in communication systems, in which a central control station and central base station are connected to multiple peripheral base stations via switching equipment using working lines and protection lines, and data is transferred from the central base station to in a mobile communication system that wirelessly transmits transmission data to a mobile station via the exchange and at least one of the plurality of peripheral base stations, the mobile communication system having the same configuration installed in the central base station; / By switching between the working/standby of the working/standby delay adjustment unit of the same configuration provided in the same central base station, which switches along with the working/standby switching of the standby downlink signal processing unit and the downlink signal processing unit, In a working/protection data switching method in a mobile communication system that performs mutual switching of a working line and a protection line between the central control station and the central base station, the working/standby delay adjustment section includes a
One of the working clock and the spare clock outputted from the spare downstream signal processing unit and used as a reference for the delay adjustment unit is used as a reference clock, the other is used as an adjusted clock, and the reference clock is sent to the intra-bit phase difference detection unit. a reference clock switching means for supplying, and an input clock for switching so as to supply either one of the return clock from the peripheral base station and the adjusted clock from the reference clock switching means to the intra-bit phase difference detection unit. A switching means and one of the working frame and working multiframe, which are output from the working/backup downlink signal processing unit and serve as a reference for the delay adjustment unit, and the protection frame and the backup multiframe, are used as a reference frame and a reference multiframe. and a reference multi-frame switching means which sets the other as an adjusted frame and an adjusted multi-frame and supplies the reference frame and the reference multi-frame to the inter-bit phase coverage section 8; frame and multi-frame,
reception multiframe switching means for switching so as to supply either the adjusted frame or the adjusted multiframe from the base multiframe switching means to the inter-bit phase difference detection section; The preliminary downlink signal processing section includes the phase difference between the working clock and the backup clock detected by the inter-bit phase cover area 8 section and the intra-bit phase difference detection section, the working frame, the working multi-frame, and the preliminary clock. The phase difference between the frame and the backup multiframe is set, the working clock and the backup clock are output to the reference clock switching means, and the working frame and the working multiframe, the backup frame and the backup multiframe are generated. A delay adjustment means for outputting a clock is provided to a timing generating section outputting to the reception multiframe switching means, and the phase difference between the working clock and the backup clock, and the difference between the working frame, the working multiframe, the backup frame, and the backup multiframe are provided. The phase difference is set to one of the delay adjustment means of the previous two working/standby downlink signal processing units, so that the phases of the working/standby clock, frame, and multiframe are the same in the working and standby signals. By doing this, when switching between the working line and the protection line, the transmitted data of both lines are made to be in the same phase.

INDUSTRIAL APPLICATION FIELD The present invention relates to a working/protection data switching system in a mobile communication system.

In recent years, public mobile communication systems have developed the use of microwave bands that can secure a large number of channels, and the use of large-scale integrated circuits (
Mobile stations have become rapidly popular due to the miniaturization and cost reduction of mobile stations through the use of LSI (LSI). In particular, radio paging systems (pagers) can be said to be one of the most popular public mobile communication systems. Recently, as a development of this wireless calling system, a pager system with a message has been put into practical use, in which the pager is equipped with a display device such as a liquid crystal display, and a message from the caller is displayed on the pager. In a one-way mobile communication system such as this pager system with a message, there is a possibility that the active line that makes up the system may be switched to the backup line due to a failure, or it may be switched from the active line to the backup line during maintenance of the stations that make up the system. In this case, communication must be temporarily stopped. Therefore, in such cases, it is desired to be able to provide a service that allows uninterrupted communication.

BACKGROUND OF THE INVENTION FIG. 3 is a block diagram showing an example of a conventional mobile communication system.

In this figure, 10 is a subscriber telephone, 20 is a local exchange, 30 is a central control station, 40 is a central base station, 50 is an exchange, 60 . ~60. are first to m-th peripheral base stations, and 70 is a mobile station (for example, a pager). From the local exchange 20, yR1 to m-th peripheral base stations 60, to 60. Until then, connections are made by a wired line 80 consisting of a downlink 81 and an uplink 82, and in particular, two sets of the line 80 are connected between the central base station 40 and the first to m-th peripheral base stations 601 to 608. (Working line and protection line) are provided.

From subscriber telephone 10 to mobile station 70 in such a configuration
Radio calls to local exchange 20, central control station 30
, central base station 40, peripheral base stations 601-60 . from there to the mobile station 70 via the wireless line 90. Here, if the mobile station 70 is a pager with a display device,
A message from subscriber telephone 10 is displayed on the display device (not shown).

Next, the specific configuration of each part of the system described above will be explained.

FIG. 14 is a block diagram of the central control station 30. As shown in FIG. In this figure, 31 is a radio paging device, and 32 is a coding device. The radio call 8 device 31 performs telephone number identification, message scrambling processing, and error correction. The encoding device 32 encodes the output of the radio paging device f31. In addition, the central control station 30 temporarily retains (saved) transmitted data when switching occurs due to switching operation of the exchange 50.
A memory (not shown) is provided.

FIG. 5 is a block diagram showing a schematic configuration of the central base station 40. As shown in FIG.

The illustrated downlink signal processing unit 41 includes a working unit and a standby unit, and performs processes such as descrambling, error correction, and resynchronization on data from the central control station 30. The first to n-th delay adjustment units 421 to 421 have the same structure and include active and backup units, and peripheral base stations 60 . to 60, respectively.

These delay adjustment units 42, -42. ．． is the surrounding base station 601
~60. In addition to performing transmission processing such as creating the frame format of the data to be sent to the downstream! The inter-bit delay (phase difference) and intra-bit delay (phase difference) with respect to the reference timing on the 81 side are adjusted, and the adjusted data is output to the modem 43. Furthermore, it detects and adjusts the inter-bit delay and intra-bit delay with respect to the reference timing on the uplink 82 side for the demodulated data from the modem 43, and performs predetermined reception processing on the signals from the corresponding peripheral base station. conduct.

The uplink signal processing section 44 includes a working section and a standby section, and includes delay adjustment sections 421 to 42. The frame format of the data from , is converted into the frame format specified by the central control station 30, and the data is sent to the central control station 30.

Furthermore, the modem 43 performs modulation/demodulation. 1st MPU (
Micro Processing IJnit)
45 controls the downlink signal processing section 41 and the uplink signal processing section 44, and the second MPU controls the delay adjustment sections 421 to 42. ．． control.

By the way, the working/standby configuration seen in the central base station 40 is intended to provide smooth communication services by switching between them during maintenance or failure of the mobile communication system. The current/spare 2
The configuration of the multiplexed line will be explained with reference to FIGS. 6(a) and 6(b). FIG. 6(a) shows the configuration of the downlink signal processing section 41 and delay adjustment section 42 of the central base station 40,
FIG. 6(b) shows the peripheral base stations 601 to 601 from the central control station 30.
60. The configuration of the working/protection duplex line up to this point is shown below.

As shown in FIG. 6(b), the central base station 40, the line 80
And the peripheral base station 60 (any one of the peripheral base stations 60° to 60.0) has two systems, a working system and a backup system.
The central control station 30 also has a working/standby transmission processing section. In addition, in FIGS. 5(a) and (b), the subscript "a" is attached to the active side, and the subscript "s" is attached to the standby side.

In the figure (b), the configurations of the active/backup downlink signal processing units 41a and 41b of the central base station 40 are the same as shown in the dashed-dotted line frames 41a and 41b in the figure (a), /The configuration of the spare delay adjustment units 42a and 42b is also -
As shown in dotted chain line frames 42a and 42b, they have the same configuration.

In the downlink signal processing units 41a and 41b, the clock (
CLK) The transfer section 101 transfers P L L (Phase L
Under the control of the locked loop section 102, the jitter in the data sent from the transmission processing section of the central control station via the modem (M/D) is removed. PLL102
outputs a reference clock for the downlink signal processing unit 41a to the clock transfer unit 101 and the timing generation unit N103. The timing generation unit 103 outputs clocks with the same timing to the synchronization establishment unit 104, the line information synthesis unit 105, and the register 106, and also outputs clocks with the same timing to the active/standby delay adjustment unit 42a.

A reference clock, a reference multi-frame, and a reference frame serving as a reference are output to 42b via the three-state buffer 107. The synchronization establishment unit 104 performs pit synchronization, and the line information synthesis unit 105, under the control of the first MPU 45 via the register 106, stores line information for polling control, etc. in a frame as shown in FIG. Insert into data.

The three-state buffer 107 is connected to the line information combining unit 10
5 and the reference clock, reference multi-frame, and reference frame output from the timing generation section 103. This control is performed by the working/standby switching section controlled by the first MPU 45. 4
7. That is, when the working/standby switching unit 47 puts the working three-state buffer 107 into a signal passing state, the data output from the line information combining unit 105, the reference clock, the reference multiframe, and the reference frame are The signal is sent via the three-state buffer 107 to the active/standby delay adjustment units 42a and 42b. At this time, the three-state buffer 107 on the standby side enters a high impedance state and enters a signal cutoff state. Furthermore, when the three-state buffer 107 on the standby side enters a signal passing state, the three-state buffer 107 on the working side enters a signal blocking state. Further, the current downlink signal processing section 41a and the standby downlink signal processing section 41b operate asynchronously.

Next, the configurations of the active/backup delay adjustment units 428 and 42b will be described, but since both have the same configuration, only the active delay adjustment unit 842a will be described. In the delay adjustment section 42a, the downlink inter-bit adjustment section 201 and the downlink intra-bit adjustment section 202 are connected to the downlink line 81a (see (b) in the same figure) via the modem 43a, and the uplink intra-bit adjustment section 203 and the clock transfer 204, an uplink bit adjustment section 205, and a synchronization detection section 206 in series to send the data transmitted on the uplink 82a (see (b) in the same figure) to the downlink signal processing section 41a. 207, and further includes an intra-bit phase difference detection section 208, an inter-bit phase difference detection section 209, and an MPU interface 21.
0. The second MPU 46 connected to this MPU interface 210 controls all adjustment sections, detection sections, and separation sections in the delay adjustment section 42a except for the clock transfer section 204.

Next, the peripheral base station 60 shown in FIG. 6(b) has a modem (
M/D) 61a and 61b1 multiplexing/demultiplexing unit (MU
X/DMUX) 69 a and 69b1 Transmitter (TX) 6
The multiplexing/demultiplexing units (MUX/DMUX) 69a and 69b each have the same configuration, and have the configuration shown in the broken line frame in the block diagram of the peripheral base station in FIG. 7. It becomes. From then on, the 7th
Each part of the peripheral base station 60 will be explained with reference to the drawings. The modem 61 performs signal modulation and demodulation processing. The downlink data reception processing unit 62 performs predetermined reception processing such as resynchronization. The speed conversion processing unit 63 converts, for example, from 4800 bpS to 120 bpS.
Data speed conversion is performed to 0 bps (processing speed of mobile station 7). The transmitter 64 transmits the signal from the speed conversion processing section 63 via the antenna 68. Speed conversion processing section 6
5 loops back the output of the speed conversion processing section 63 and performs reverse speed conversion processing. The uplink data transmission processing unit 66 performs predetermined data transmission processing such as resetting the synchronization pattern. M
The PU67 includes a downlink data reception processing section 62, a speed conversion processing section 63, a speed conversion processing section 65, and an uplink data transmission processing section B6.
Control 6.

Next, FIG. 8 shows an example of a frame format of data transmitted between the central control station 30 and the central base station 40, and will be explained.

The frame format shown in this figure is synchronization pattern 5.
YNC (16 bits) and TXCONTl, which instructs whether to make surrounding base stations active or inactive.
and TXCONT2 <16 bits each) and message data DATA 1 and DATA 2 for surrounding base stations.
(300 bits each), and 252 bits and 300 bits (for use when the number of subscribers increases).

Further, one frame is 1200 bits and 10.25 seconds.

Further, FIG. 9 shows an example of a frame format of data transmitted between the central base station 40 and the peripheral base stations 60, and will be explained.

The frame format shown in this figure is synchronization pattern 5.
YNC (16 bits) and surrounding base stations 601 to 60.0
A 16-bit TXCO that specifies whether to make one specified peripheral base station active or inactive.
NT 1, message data or delay adjustment pattern DATA l for one of its peripheral base stations, and T
Reserve (empty) TXCONT2 (16 bits) and DA provided in the same way as XCONTl and DATA I
TA2 (300 bits), 252-bit coded line information of the master that specifies which peripheral base station this one frame is for, and control information of the monitoring device installed in the system. 300 bits of device information that defines Furthermore, one frame is 1200 bits and 10°25 seconds.

Problems to be Solved by the Invention By the way, in the mobile communication system described above, in the event of system maintenance or failure, the central base station 40
When switching from the current downlink signal processing section 41a to the backup downlink signal processing section 41b (or from the backup 41b to the current 41a), the current and backup downlink signal processing f[541a, 4
1b operate asynchronously, a phase difference occurs between the downstream signal processing units 41a and 41b. Therefore, when the reference clock, reference frame, and reference multiframe from the switched spare downlink signal processing unit 41b are sent to the subsequent stage, these references are out of sync with the previous reference, that is, they are not synchronized. , all surrounding base stations 60,
~60. Once the synchronization is lost, a synchronization alarm will occur. Thereafter, the upstream synchronization of the delay adjustment section will also be lost. Therefore, in order to eliminate such defects, it is necessary to perform delay adjustment based on a new reference signal.

This delay adjustment is performed by the switched spare downlink signal processing section 41.
Based on the reference signal from peripheral base station 60.b, downlink data is transmitted from peripheral base station 60.b. The inter-bit phase and the intra-bit phase of the returned data are determined by the delay adjustment unit 42.
b is detected by the inter-bit phase difference detection section 209 and the intra-bit phase difference detection section 208, and this detected value is set in the uplink/downlink inter-bit adjustment section 205.201 and the uplink/downlink intra-bit adjustment section 203.202. By this, the received multiframe is compared to the reference multiframe by the peripheral base station 60.
Adjust so that everything between 1 and 60 matches.

However, when making such adjustments, all the peripheral base stations 601 to 60 must be stopped after all transmission data is saved in the memory of the central control station 30. For this reason, the subscriber line must be blocked from switching between working and standby until the completion of delay adjustment, resulting in the problem that smooth communication services cannot be provided.

The present invention has been made in view of these points,
By mutually switching between working and backup communication paths without blocking subscriber lines, working and backup data can be switched, thereby providing smooth communication services in a mobile communication system. The purpose is to provide a backup data switching method.

Means to solve problems FIG. 1 is a diagram showing the principle of the present invention.

In the figure, the central base station 40 includes working/standby downlink signal processing units 141Aa and 41Ab (the configuration diagram of 41Ab is omitted) that have the same configuration, and a working/standby delay adjustment unit 42Aa that has the same configuration.
, 42Ab <The configuration diagram of 42Ab is omitted). The characteristic part of the present invention is that the downlink signal processing units 41Aa and 41Ab of the central base station 40
20 is provided, and the delay adjustment units 42Aa and 42Ab are provided with a reference clock switching means 223 and an input clock switching means 220.
In addition, a reference multiframe switching means 222 and a receiving multiframe switching means 221 are provided.

The reference clock switching means 223 receives the working click and the spare clock output from the delay adjustment means 120 of the working/standby downlink signal processing units 41Aa and 41Ab, sets one as the reference clock and the other as the adjusted clock, and sets the clock to the reference clock and the other as the adjusted clock. A clock is supplied to the intra-bit phase difference detection section 208.

The input clock switching means 220 connects the peripheral base stations 60, to 6
0. Return clock and reference clock switching means 2
Switching is performed to supply one of the adjusted clocks from 23 to the intra-bit phase difference detection 8208.

The reference multi-frame switching means 222 is a timing generator 81 for the working/protection downlink signal processing units 41Aa and 41Ab.
Receive the working frames and working multiframes and the spare frames and spare multiframes from 03 to 8, and -
-S is a reference frame and a reference multiframe, and the other is a frame to be adjusted and a multiframe to be adjusted, and the reference frame and reference multiframe are supplied to the inter-bit phase difference detection unit 209.

The reception multi-frame switching means 221 is a peripheral base station 60
□～60. , and the adjusted frame and adjusted multiframe from the reference multiframe switching means 222 are supplied to the inter-bit phase difference detection section 209.

Delay adjustment means 12 of downlink signal processing units 41Aa and 41Ab
0 includes the phase difference between the working clock and the backup clock detected by the inter-bit phase difference detection unit 209 and the intra-bit phase difference detection unit a 208, and the difference between the working frame, the working multiframe, the spare frame, and the spare multiframe. The phase difference is set.

Function According to the present invention described above, the delay adjusting section 42Aa42Ab
Of the working clock and the spare clock input to the reference clock switching means 223 of This detected phase difference is set in the delay adjustment means 120 of the downstream signal processing section 41Ab that outputs the adjusted clock.

Further, among the current frame and the working multiframe and the spare frame and the spare multiframe inputted to the reference multiframe switching means 222, one is set as the reference frame and the reference multiframe, and the other is set as the adjusted frame and the adjusted multiframe. , the inter-bit phase difference detection unit 209 detects the phase difference between both frames and multi-frames, and this detected phase difference is used in the downstream signal processing 1a on the side that outputs the adjusted frame and adjusted multi-frame.
41Ab is set in the delay adjustment means 120.

Then, the delay adjustment means 120 on the side where the set is performed adjusts the phase of the clock output from this delay adjustment means 120 so that it matches the phase of the other clock. Furthermore, since the timing generation section 103 operates based on the phase-adjusted tarok, the phases of frames and multiframes output from the timing generation section 103 also match the phases of other frames and multiframes. In other words, since the phases of the working/protection clock, frame, and multiframe are always adjusted to be in the same phase, when switching between the working line and the protection line, the transmitted data of both lines is kept in the same phase. It can be done. As a result, when switching between working and backup lines,
There is no need to block the line and perform phase matching.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 2(a) and 2(b) are block diagrams for explaining a working/protection data switching method in a mobile communication system according to an embodiment of the present invention.
Parts corresponding to those of the conventional example shown in a) and (b) are given the same reference numerals, and their explanations will be omitted. Note that FIG. 2(a) shows the configuration of the downlink signal processing section and delay adjustment section of the central base station 40, and FIG. This figure shows the configuration of a working/protection duplex line up to 60 yo.

The difference between the embodiment of the present invention and the conventional example shown in FIG. 6 is that the internal configurations of the downlink signal processing section and delay adjustment section of the central base station 40 have been changed, and the signal connections thereof have also been changed. The changes will be explained below with reference to FIG.

First, the active/standby downlink signal processing sections 41Aa and 41Ab shown in FIG. , a timing generation section 103, a synchronization establishment section 104, a line information synthesis section 105, a register 106, and a three-state buffer 107a. In the conventional downlink signal processing sections 41a and 41b shown in FIG. 6(a), a delay adjustment section 42a.

The reference clock, reference frame, and reference multi-frame inputted to 42b are outputted via the three-state buffer 107, but the downstream signal processing unit 41Aa of the present invention shown in FIG. 2(a), In 41Ab, the reference clock is directly output from the delay adjustment means 120, and the reference frame and reference multi-frame are directly output from the timing generation unit 103. Furthermore, the data output from the line information synthesis section 105 is output via the three-state buffer 107a as in the conventional case. Note that the reference clock, reference frame, and reference multiframe output from the currently used downlink signal processing 141Aa are hereinafter referred to as the currently used clock,
A reference clock output from the downlink signal processing unit 41Ab on the protection side, which is called a working frame and a working multiframe;
The reference frame and the reference multiframe will hereinafter be referred to as a preliminary clock iy, a preliminary m frame, and a preliminary multiframe.

Active/standby delay adjustment units 42Aa, 42Ab (standby side 4
2Ab (not shown because they have the same configuration) are a downlink bit adjustment section 201, a downlink intra-bit adjustment section 202, an uplink intra-bit adjustment section 203, a clock transfer section 204, an uplink inter-bit adjustment section 205, and a synchronization detection section. 206, an intra-bit phase difference detection section 208, an inter-bit phase difference detection section 209, and an MP
U interface 210, newly added input clock switching means 220, and receiving multiframe switching means 22
1, reference multi-frame switching means 222, and reference clock switching means 223.

The working clock and the spare clock output from the working/standby downlink signal processing section 41Aa are input to the reference clock switching means 223 of the working/standby delay adjustment sections 42Aa and 42Ab, Frame and working multi-frame and spare frame and spare multi-frame are working/standby reference multi-frame switching means 2
22.

Conventionally, peripheral base stations 601 to 60 . The inter-bit phase and intra-bit phase of the data returned from 205° 201 and the uplink/downlink internal bit adjustment unit 203202, the received multiframe is set to the peripheral base station 6 with respect to the reference multiframe.
I adjusted everything to match between 0 and 601.

However, in the present invention shown in FIG. 2, processing is further performed to match the phases of the working/standby clocks, working/standby frames, and working/standby multi-frames with phase differences between the working and standby clocks.

This is based on one of the clocks, frames, and multi-frame working/standby input to the reference clock switching means 223 and reference multi-frame switching means 222 of the preliminary delay adjustment n42b, and the other as the adjusted signal. By doing so, the inter-bit phase difference and intra-bit phase difference between the current and backup signals are detected, and the detection results are set in the delay adjustment means 120 of the backup downstream signal processing section 41Ab.

By setting each phase difference in the backup delay adjustment means 120 in this way, the phase of the backup clock output from the backup delay adjustment means 120 matches the phase of the current clock. Furthermore, since the spare timing generation unit 103 operates with a spare clock having the same phase as the working clock, the phases of the spare frame and the spare multiframe outputted from the spare timing generation unit 103 also match the phases of the working frame and the working multiframe. It will fit. In other words, since the working/standby clocks, frames, and multiframes are always synchronized in this way, during maintenance or failures, there is no need to adjust the inter-bit phase and intra-bit phase as in the past. It is possible to switch the communication path from the current to the backup, and to switch the communication data from the current to the backup.

Therefore, when switching between working and standby, all the transmission data is saved in the memory of the central control station 30 as in the conventional case, and then all the peripheral base stations 60. 601 and blocking subscriber lines, it becomes possible to provide smooth communication services.

Effects of the Invention As explained above, according to the present invention, communication data can be switched from working data to backup data by mutually switching between working and backup communication paths without blocking subscriber lines. This has the effect of providing smooth communication services.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of the present invention, FIGS. 2(a) and 2(b) are block diagrams for explaining a working/protection data switching method in a mobile communication system according to an embodiment of the present invention, and FIG. Figure 4 is a block diagram of the mobile communication system; Figure 4 is a block diagram of the central control station shown in Figure 3; Figure 5 is a schematic block diagram of the central base station shown in Figure 3; > and (b) are block diagrams explaining the active/protection data switching method in a mobile communication system according to an embodiment of the present invention, FIG. 7 is a block diagram of peripheral base stations, and FIG. 8 is a block diagram of central control. FIG. 9 is a diagram showing the frame format of data transmitted between the central control station and the peripheral base stations. 30...Central control station, central base station, ~60.... peripheral base station, Aa... working downlink signal processing unit, Ab... standby downlink signal processing unit, Aa... working delay adjustment unit, Ab. ... Reserve delay adjustment section, 0... Delay adjustment means, 0... Input clock switching means, 1... Reception multi-frame switching means, 2... Reference multi-frame switching means, 3... Reference Clock switching means, 3... Timing generation unit, 8... Intra-bit phase difference detection unit, 9... Inter-bit phase difference detection unit. 40...

Claims (1)

[Scope of Claims] The central control station (30) and the central base station (40) are connected to a plurality of peripheral base stations (60_1 to 60_m) via a switch through a working line and a protection line. 40)
The transmission data from the exchange and the plurality of peripheral base stations (
60_1 to 60_m) in a mobile communication system that wirelessly transmits data to a mobile station via at least one peripheral base station (60_1 to 60_m); (41Aa, 41Ab) and
Working/standby delay adjustment units (42Aa, 42Aa, 41Ab) of the same configuration provided in the same central base station (40) are switched as the downlink signal processing units (41Aa, 41Ab) are switched between working/standby mode.
In the working/protection data switching method in a mobile communication system in which the working line and the protection line between the central control station (30) and the central base station (40) are mutually switched by switching between the working line and the protection line of the central control station (30) and the central base station (42Ab), The working/standby delay adjustment units (42Aa, 42Ab) are connected to the working/standby downlink signal processing units (41Aa, 41A).
b), and the delay adjustment unit (42Aa, 42Ab
), one of the current clock and the standby clock is used as the reference clock, and the other is used as the adjusted clock, and the reference clock is used as the intra-bit phase difference detection unit (208).
a reference clock switching means (223) that supplies either one of the return clock from the peripheral base station (30) and the adjusted clock from the reference clock switching means (223) to the intra-bit phase difference detection section. (208) Input clock switching means (220) for switching to supply the clock to (208)
and the active/protection downlink signal processing unit (41Aa, 41Ab)
One of the working frame and working multi-frame and the spare frame and spare multi-frame which are outputted from the delay adjustment unit (42Aa, 42Ab) as a reference is used as a reference frame and reference multi-frame, and the other is used as a frame to be adjusted and a frame to be adjusted. In addition to converting the reference frame and the reference multi-frame into multi-frames, the inter-bit phase difference detection unit (
Reference multi-frame switching means (22
2), and one of the return data frames and multiframes from the peripheral base stations (60_1 to 60_m) and the adjusted frame and adjusted multiframe from the reference multiframe switching means (222). A reception multi-frame switching unit (221) is provided for switching the signal to be supplied to the inter-bit phase difference detection unit (209), and the working/backup downlink signal processing units (41Aa, 41Ab)
), the phase difference between the working clock and the backup clock detected by the inter-bit phase difference detection unit (209) and the intra-bit phase difference detection unit (208), and the difference between the current frame, the current multiframe, and the backup clock. The phase difference between the frame and the spare multiframe is set, and the working clock and the spare clock are output to the reference clock switching means (223), and the working frame and the working multiframe and the spare frame and the spare multiframe are output. A delay adjustment means (120) is provided for outputting a clock to a timing generation section (103) that generates and outputs it to the reception multi-frame switching means (221), and a delay adjustment means (120) is provided for outputting a clock, and the phase difference between the working clock and the backup clock and the working frame are And the phase difference between the working multiframe and the protection frame and the protection multiframe is determined by the delay adjustment means (1
20, 120) so that the phases of the working/protection clock, frame, and multiframe are the same for both the working and protection lines, so that when switching between the working line and the protection line, both 1. A working/protection data switching method in a mobile communication system, characterized in that transmission data of lines are in the same phase.