JPH0396132A - Phase adjustment system in mobile communication system - Google Patents

Abstract

PURPOSE:To avoid a phase difference between plural peripheral base stations with simple circuit constitution by adjusting the phase with loopback of a wired system. CONSTITUTION:A control means 107 sets a half of a phase difference detection signal from an in-incoming bit phase difference detection means 105 to an in- outgoing bit delay adjustment means 102 and an in-incoming bit delay adjustment means 103. Then the control means 107 sets a half of a phase difference detection signal from an inter-incoming bit phase difference detection means 106 to an inter-outgoing bit delay adjustment means 101 and an inter-incoming bit delay adjustment means 104 when the phase difference detection signal from the inter-incoming bit phase difference detection means 106 is an even number. Moreover, after the value of the inter-incoming bit phase difference detection signal is an even number, a half of the detected value is set respectively to incoming/outgoing inter-bit delay adjustment means 101, 104. Thus, the phase of the transmission timing of the data is adjusted so that there is no phase difference among plural peripheral base stations 1301-130m.

Description

[Detailed Description of the Invention] [Summary] A central base station and a plurality of peripheral base stations are connected by downlink and uplink via an exchange in which downlink delay and uplink delay are equal, and the central base station Regarding a phase adjustment method in a mobile communication system that unidirectionally transmits transmission data to a mobile station via at least one peripheral base station, the purpose is to improve system services and simplify the overall system configuration, A central base station and a plurality of peripheral base stations are connected via a switch by a wired line consisting of a downlink and an uplink, and the downlink delay in the downlink and the uplink delay in the uplink are connected so that the central base station is equal, and wirelessly transmits transmission data from the central base station to the mobile station via the exchange and at least one peripheral base station among the plurality of peripheral base stations. In the adjustment method, the central base station includes downlink inter-bit delay adjustment means and downlink intra-bit delay adjustment means for separately adjusting inter-bit delay and intra-bit delay of transmission data to the peripheral base station; Interchange J
/J! uplink intra-bit delay adjustment means and uplink inter-bit delay adjustment means for separately adjusting the intra-bit delay and inter-bit delay of data input through the device; and upstream data delayed by the uplink intra-bit delay adjustment means. an uplink intra-bit phase difference detection means for detecting an intra-bit phase difference of the uplink data, and an uplink bit cycle phase difference detection means for detecting an inter-bit phase difference of the upstream data delayed by the upstream bit cycle delay adjustment means;
The phase difference detection signals of the upstream bit intra-phase difference detection means and the upstream bit ltlI difference detection means are supplied, and the value of the upstream bit phase difference detection signal is adjusted by the downstream bit delay adjustment stage f and After setting each of the upstream intra-bit delay adjusting means, 1/2 of the even value of the upstream inter-bit phase difference detection signal is applied to each of the downstream inter-bit delay adjusting means and the upstream inter-bit delay clearing means. Each of the plurality of peripheral base stations has a downlink signal processing means for performing signal processing of the transmission data from the central base station input on the downlink via the exchange. , an uplink signal processing means for returning the data obtained by performing signal processing opposite to the downlink signal processing means on the data taken out from the downlink signal processing means to the central base station via the uplink switch; It is configured to have the following.

[Application fields of mulberry]

The present invention relates to phase adjustment in a mobile communication system, and in particular, the present invention relates to phase adjustment in a mobile communication system, and in particular, when a central base station and a plurality of peripheral base stations
In a mobile communication system connected by downlink and uplink via an exchange in which the LAM extension and uplink delay are equal, and in which transmission data from a central base station is unidirectionally transmitted to a mobile station via at least one peripheral base station. Regarding phase adjustment method.

In recent years, public mobile communication systems have utilized microwave bands that can secure a large number of channels, and large-scale integrated M circuits (
Miniaturization of mobile stations by using LSI>. It has rapidly become popular due to lower prices. In particular, radio paging systems (so-called pagers) can be said to be one of the most popular public mobile communication systems. As a recent development of this radio paging system, a pager system with a message has been partially 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 message pager system, it is important to downsize the individual stations controlling the system and improve the service of the system.

[Conventional technology]

FIG. 4 shows a 10-step configuration diagram of an example of a conventional mobile communication system. In the figure, 10 is a subscriber telephone, 20 is a local exchange, 30 is a central office, 40 is a central base station, 50 is an exchange, and 60+~60WI are peripheral 1jeJS#1~#
m. 70 is a receiving station; 80 is a mobile station (for example, a pager); from the local exchange 20 to peripheral base stations 60+ to 60;
m and the receiving station 70 are connected by a wired line 90 consisting of an uplink and a downlink, and in particular, the central base station 4
Two sets of the above-mentioned lines 90 (working line and protection line) are provided between 0 and the peripheral bases 8601 to 60Tn and the receiving station 70.

A focal line call from the subscriber telephone Fs10 to the mobile station 80 is made through the local exchange 20. The signal is provided to peripheral base stations 60+ to 60m within the area where the mobile station 80 is located via the central station 30, the central base station 40, and the exchange 50, and from there to the mobile station 80 via the wireless line 95. If the mobile station 80 is the above-mentioned pager with a display device, a message from the subscriber telephone 10 is displayed on a display device (not shown).

In the mobile communication system described above, normally when the system is started up, the central base 840 is corrected so that the data reception timing at the reception 870 (located at approximately the same distance as each peripheral base station 60+ to 60 boxes) is the same. (not shown in Figure 4)
For each peripheral base station 601 to 60Tn, place J#J ([1
) are being adjusted.

This is 21 J. out of 60 surrounding base stations ~ 60 m. When the mobile station 80 receives messages at a location where the areas of the surrounding base stations above overlap, if there is a phase difference of more than a predetermined amount in the transmission timing of the messages sent from those surrounding base stations, the message may be received incorrectly. This is because they may not be able to receive it. The amount of delay varies depending on the route of the line 90. Therefore,
When the route of the line 90 is switched by the switching operation of the exchange 50, the phase correction unit of the central base station 40 needs to perform phase adjustment according to the amount of delay of the switched line 90.

In the conventional system, in this case, the transmission data is temporarily saved in a memory (not shown in FIG. 4) within the central base station 40, and all peripheral base stations 601 to 6
Interrupt the transmission function of 0Tn (stop the service).

The specific configuration of each device will be explained below, including this problem.

FIG. 5 shows a block diagram of the central office 30. As shown in FIG.

In the figure, 31 is a focal line calling device, 32 is an encoding device, and 33 is a line connection device. The radio paging device 31 performs telephone number identification, message scrambling processing, and error correction. The encoding device 32 encodes the output of the focal line calling device 31. The line connection device 33 is the central base station 40
Control the line connection with. The central base station 30 further includes a memory (not shown) for temporarily holding (saving) transmission data when switching is performed by the switching operation of the switching equipment 50.

FIG. 6 shows a block diagram of the central base station 40. As shown in FIG. The downlink data reception processing section 41 performs processes such as disk crumple, error correction, and resynchronization on the data from the central station 30. The phase correction units 42+ to 42 have the same configuration and are provided corresponding to the peripheral base stations 60+ to 60m and the receiving station 70, respectively. In the phase correction section 421, the downlink data transmission processing section 4 is connected to the downlink 90+.
2-1 and a downlink data delay processing unit 42-2 are provided,
In the uplink [190x, the uplink data delay processing unit 42-
3 and an uplink data reception processing PIS 42-4 are provided.

The downlink data transmission processing unit 42-1 processes peripheral base stations 601 to
It performs transmission processing such as creating a frame format for data to be sent to 60m and reception 870. The downlink data delay processing unit 42 - 2 adjusts the bit specific delay (phase difference) and the intra-bit delay (phase difference) with respect to the reference timing on the downlink 90 + side, and outputs the adjusted data to the modem 43 .

The uplink data delay processing i1flL42-3 detects and adjusts the bit mg delay and intra-bit delay with respect to the reference timing on the uplink 11902 side for the TL tone data from the modem 43. The uplink data reception processing section 42-4 performs predetermined reception processing on signals from the corresponding peripheral base station or receiving station 70. The uplink data transmission processing unit 44 converts the Norem format from the phase correction units 42+ to 42n into a frame format specified by the central office 30, and outputs the frame format to the central office 830. Modem 43 performs modulation/demodulation processing.

The MPU-A (microprocessor A) 45 costs $1119 for the downlink data reception processing section 41 and the uplink data transmission processing section 44. MPU-846 includes phase correction section 42+~
Controls 42m. Although FIG. 6 only shows the active side, the same applies to the standby side.

FIG. 7 shows a block diagram of an arbitrary one of the peripheral base stations 60t among the peripheral base stations 60+ to 60n. The modem 61 performs modulation and demodulation processing of the bow.

The downlink data reception processing unit 62G performs predetermined reception processing such as resynchronization at fT. For example, the speed converter 63 has 4
g{)Obl) Data speed conversion is performed from S to 1200 bps (processing speed of the mobile station 80). The transmitter Il 64 transmits the signal from the speed conversion processing section 63 via the antenna 68. The speed conversion processing section 65 is the speed conversion processing section 6
The output of step 3 is looped back and reverse speed conversion processing is performed. The uplink data transmission processing unit 66 performs predetermined data transmission processing such as reattaching the first edition pattern. The MPU 67 controls the downlink data reception processing section 62, speed conversion processing section 63, speed conversion processing section 65, and uplink data transmission processing section 66 at t, IJt[
I do it.

FIG. 8 shows a block diagram of reception 870.

The modem 71 performs modulation and demodulation processing of the bow. The downlink data reception processing section 72 performs predetermined data reception processing. The speed conversion processing unit 73 converts the speed of the signal from the downlink data reception processing unit 72 and outputs reference timing. receiver 7
5 is a peripheral base station 60+ obtained via an antenna 79
Receives and processes radio waves from ~60m.

The phase difference detection processing section 74 detects the phase difference between the reference timing from the speed conversion processing section 73 and the received data from the receiver 4g machine 75. The detected phase difference is sent to the uplink data transmission processing section 77. The speed conversion processing section 76 returns the output of the speed conversion processing section 73 and performs speed conversion processing opposite to that of the speed conversion processing section 73. The uplink data transmission processing section 77 uses the output of the speed conversion processing section 76 and the phase difference detection processing section 74.
Performs predetermined transmission signal processing on the output. The MPU 78 controls each of the units 72 to 74, 76, and 77 mentioned above.

FIG. 9 shows an example of a 7-frame format transmitted between the central station 30 and the central base station 40.

The frame format is lmllll pattern SYNC (
16 bits), ゜rXcONrl and TX that instruct whether to make the surrounding base station active or inactive.
cONT2 (16 bits each), message data DATAI and DATA2 (300 bits each) for surrounding base stations
t'yt), G[FIC 252k't, and 300 bits of free space (for when the number of subscribers increases). And one frame is 1200 bits/0.25sec
It is.

In the above configuration, when starting up the system, receiving station 7
The delay amounts of the phase correction units 421 to 42n of the central base station 40 are adjusted on both the active side and the standby side so that the data reception timings at 0 coincide with each other. After this adjustment, the system enters the operational state.

In this state, it is assumed that the working line is switched by exchange I1150 and becomes the route of lines 901 and 902. The transmission data transmitted from the central base station 40 via this new route is looped back by the peripheral base stations 601 to 60m on the working line side, and sent to the phase correction units 421 to 42π of the central base station 40 via the exchange 50. Given. Phase correction section 42+
~42n detects the multiframe synchronization timing of the received data, compares the detected timing with the reference multiframe timing under the control of MPLJ-846, and determines whether the working line is switched due to synchronization deviation. Detect that. This detection result is sent from the central base 840 to the central station 30.

After the central station 30 saves all the transmission data at this time, including the transmission data, into a memory (not shown), the central station 30 stops the transmission operations of all the peripheral base stations 60+ to 60m.
The IJ control signal is sent to the peripheral base stations 60+ to 60m via the central base station 40 and the exchange 8150. As a result, the peripheral base stations 60+ to 60mU transmission operation is stopped.

Next, the central station 30 transmits a predetermined delay adjustment pattern only to the peripheral base stations 60+ connected to the switched lines 901 and 902, and at the same time transmits the peripheral base stations 60+ {i
Resume operation. Receiving station 70 receives this delay adjustment pattern transmitted from peripheral base station 60+. on the other hand,
The central base station 40 sends this delay adjustment pattern to the receiving station 70 via the switched downlink 90+.

A phase difference detection processing section 74 of the receiving station 70 shown in FIG. 8 compares the two delay adjustment patterns and detects the phase difference. Before the line is switched, the phase difference is pyro, but after the line is switched, a phase difference occurs. This phase difference is sent from receiving station 70 to central base station 40 via line 90.

The central base station 40 extracts this phase difference information and sets a delay amount corresponding to the phase difference. By repeating this, when the phase adjustment of the uplink 90+ is completed, the transmitting operations of the remaining peripheral base stations are restarted by the central link 30. Normally, the inter-bit phase difference can be adjusted within a range of 256 bits, and the intra-bit phase difference can be adjusted within a range of ±128 steps.

[Problem to be solved by the invention]

However, in the phase adjustment method in the conventional unidirectional mobile communication system described above, phase difference correction that is necessary when the line is switched by alternating YK operation is performed by evacuating all transmitted data at this time to the central station 30. After that, it is necessary to stop all surrounding base stations 60+~60m,
There is a problem in that the scale of the central station 30 is large and it is difficult to provide smooth services.

Conventionally, for phase adjustment, as shown in FIG. A specific one is called a system reference receiving station), making the overall system structure large-scale.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a phase adjustment method in a mobile communication system that can improve system services and simplify the overall system configuration.

[Means to solve the problem]

FIG. 1 shows a block diagram of the principle of the present invention. In the same figure, 10
0 is the central base station. 110 is a wired line consisting of a downlink @ 111 and an uplink 112. 120 is a switch, 1301
~130Tn are m peripheral base stations (m is an integer of 2 or more). Central base station 100 and peripheral base stations 1301 to 13
0T+1 are connected by a wired line 110 via an exchange 120 with equal uplink delay and downlink delay, and transmission data from the central base station 100 is transferred via the exchange 120 and at least one peripheral base station, respectively. In a mobile communication system that transmits wirelessly to one station, the present invention
00 to the downward inter-bit delay adjustment means 101, the downward bit delay adjustment means 101, the downward bit delay adjustment means 101,
internal delay adjustment means 102, upstream bit internal delay adjustment means 10
3. 1,000 stages of upstream bit delay adjustment 104, 1,000 stages of upstream bit internal phase difference detection 105, upstream bit phase difference detection means 10
6 and control stage 107, surrounding base station 1301
~130Tl1 is characterized in that each of them is composed of a downlink signal processing means 131 and an uplink signal processing f stage 132.

Here, the downlink bit mm delay adjustment means 101 and the downlink intra-bit delay adjustment stage 102 are arranged at peripheral bases 16 13
G+~130. separately adjusting the inter-bit delay and intra-bit delay of the data transmitted to. Uplink intra-bit delay adjustment means 103 and uplink bit rtJ delay adjustment means 104
separately adjust the intra-bit delay and inter-bit delay of the data input via the switch 120, respectively.

In addition, the above-mentioned liIIJII+ means 107 is supplied with each phase difference detection signal of the upstream intra-bit phase difference detection stage 105 and the upstream inter-bit phase difference detection means 10B, and is 1/2 of the value of the upstream intra-bit phase difference detection signal. 1,000 stages of downstream intra-bit delay adjustment 102 and 1,000 stages of upstream intra-bit delay adjustment 103
After setting 1/2 of the even value of the uplink inter-bit phase difference detection signal to each of the downlink inter-bit delay adjustment means 101 and the uplink bit rrJ delay adjustment means 104.

On the other hand, the downlink signal processing means 131 performs signal processing of the transmission data. Further, the upstream signal processing means 13
2 performs signal processing opposite to the downlink signal processing stage 131 on the data taken out from the downlink signal processing means 131, and sends the data obtained through the uplink 112 to the central base station 100 via the exchange 120. Fold back.

[Effect]

Transmission data from the central base 8100 is sent to each peripheral base station 130 via an exchange 120 with equal uplink/downlink line delay.
The signal is looped back to the exchange 120 via the downstream signal processing means 131 and the upstream signal processing stage f 132M in 1 to 1301, and is further returned from the exchange 120 to the central base station 100. At this time, each of the delay adjustment units 101, 102, 103 described above
The delay times 104 and 104 are fixed times preset by the control means 107.

Next, the llltllf stage 101 sets the value of the phase difference detection signal from the upstream intra-bit phase difference detection means 105 to each of the downstream intra-bit delay adjustment stage f 102 and the upstream intra-bit delay adjustment means 103. As mentioned above, the uplink delay and the downlink delay are equal, so by setting lf of the above uplink intra-bit phase difference detection values, one uplink bit 1
・The internal phase difference detection value becomes zero.

Next, when the value of the phase difference detection signal from the upstream bit same phase difference detection means 106 is an even number, the IJt[I means 107 outputs four of them to the downstream inter-bit delay adjustment means 101 and the upstream inter-bit delay adjustment stage 104. Set for each.

When the value of the inter-bit phase difference detection signal is an odd number, v1tl
The lf stage 107 adjusts the upstream/downstream internal delay adjustment units 102 and 1 so that the value of the inter-bit phase difference detection signal is an even number.
03 respectively, and the value of the phase difference detection signal between upstream bits is detected again.

111t[t After confirming that the value of the upstream bit in-phase difference detection signal is an even number, the means 107 then confirms that the detected value is 4! r bits are set in the uplink/downstream delay adjustment means 101 and 104, respectively.

By performing the above-mentioned secondary functions, peripheral base stations 1301 to 1301
The transmission timing of data transmitted from each downlink signal processing stage 131 of the 130Tn to the mobile station via the transmission 1 (not shown) is adjusted so that there is no phase difference between the plurality of peripheral base stations 1301 to 130Tn. can be adjusted.

In the present invention, the above phase adjustment can be performed by turning back the wired system, and can be performed without blocking the line rI1.

〔Example〕

FIG. 2 is a block diagram of a main part of an embodiment of the present invention, and FIG. 3 is a block diagram of a mobile communication system Sr to which the present invention is applied.
The It diagram is shown. In FIGS. 2 and 3, the same components as in FIGS. 1 and 4 are denoted by the same reference numerals, and their explanations will be omitted. Further, in FIG. 2, illustration of the exchange 120 is omitted for convenience.

The embodiment shown in FIG. 2 is an example applied to the above-mentioned message pager system, and the central base 8 100
, line 110 and peripheral base stations 130 (1301 to 1 above)
Any one of the 30m) [It has two systems, one for current use and one for backup. In Figure 2, the current side is shown with the subscript a set to 0,
The spare side is indicated by inverting the subscript b. In Figure 2, central base station 1
00 is the central station transmission/reception data processing section 150, phase correction section 2
00a and 200b, modem (M/D) 250a and 250b. The central station transmission/reception data processing unit 150 generates transmission data and the like, and also processes received data. The phase correction sections 200a and 200b each have the same structure, and have the structure shown within the dashed-dotted line frame 200 at the top of FIG.

On the other hand, peripheral base stations 130 (for 1301 - 130)
is modem (M/D) 300a and 300b, multiplexing/
Separation section (MUX/DMUX) 350a and tF 350
b, transmitters (TX) 400a and 400b, and an antenna 450. Multiplexing/separating section 3
50a and 350b each have the same configuration, and have the configuration shown within the dashed-dotted line frame 350 at the top of FIG.

As shown by 200 in FIG. 2, each of the phase correction units 200a and 200b includes a downstream bit adjustment unit 201. The downlink internal bit adjustment unit 202 is connected to the downlink line 111 via the modem 250, and the uplink internal bit adjustment unit 203,
The data transmitted on the uplink 112 via the clock converter 204, the uplink inter-bit adjuster 205, and the synchronization detector 206 in series is sent to the central base station transmit/receive data processor 15.
The configuration is such that the signal is sent to G and also sent to the line information separation section 207, and further includes an intra-bit phase difference detection section 208, an inter-bit phase difference detection section 209, and an MPU 210. The MPU 210 has a phase correction unit 200 (20
0a, 200b) clock conversion 11i1 20
The operation of the remaining parts except for 4 will be described later. l
I do it.

1 between modem 25G (250a, 250b) and modem 300 (300a, 300b)
! The seven-frame format of the data transmitted in round 1 110 is shown in FIG. In the figure, one noreme is 12
00 bit, synchronization pattern SYNC (16 bits),
Peripheral base m 13 (h ~ 130 16-bit rXcONT1 that instructs whether to make one designated peripheral base station among TI1 7 units or inactive. 300-bit message data or delay for that one peripheral base station The adjustment pattern DA rA 1 .rX
Spare (empty) bit TXCONT2 (16 bits) provided in the same way as cONT1 and [)ATAI
and DATA 2 (300 hits), Kono 1 7
252-bit coded line information for specifying which peripheral base station the L/1 frame is for, and 300-bit coded line information for specifying monitoring information for the monitoring equipment installed in the system. Device information is synthesized in chronological order. In this data, one frame is 0. It is transmitted at a speed of 25 seconds. Note that the central base station 100 has a central station 3.
Data in the Norem format shown in FIG. 9 is input from 0 as in the conventional case.

Returning to FIG. 2 again, the multiplexing/demultiplexing section 35
0 (350a, 350b) is downlink I/a
A downlink reception processing section 351 receives the data in the frame format shown in FIG.
Convert TXCONrl and DArA1 extracted by 51 to a predetermined speed (multiplex and send) @ 401
The speed conversion unit 3 converts the speed conversion i'i 352 sent to the speed conversion unit 352 to
52 and the data from the speed converter 353 (TXCONT1 and DA
rA 1 ) into the frame format shown in FIG. 10 (separated) and sends it out as uplink data, and an MPU 3S5.

The MPU 3S5 receives downlink information and TA information in the frame format shown in FIG. The uplink transmission processing section 354 is ilJtlled to perform signal processing of the output data.

Next, the phase adjustment operation of the above embodiment will be explained. Phase adjustment is performed at least when the system is set up and when switching from the working line to the protection line, and the same procedure is used for the system. Also, surrounding base 74 1301-1
30. Because the phase adjustment is carried out in the same procedure for both the working line and the standby line, the digit 1 of the working line 110a in FIG.
Adjusted IJ work will be explained.

At the time of system start-up, or due to a failure in the working line 110a, switch to the backup line 9 (110F) and adjust the phase of the line 110a, which had been in use until then, while continuing the i-line service as before. . First, phase correction section 2
The downlink bit fmM adjustment unit 201. The downlink intra-bit adjustment section 202, the uplink intra-bit adjustment section 203, and the uplink inter-bit adjustment section 205 are initialized and set to fixed delays.

Transmission data from the central station 30 (not shown) is sent to the downlink inter-bit adjustment section 201, the downlink intra-bit adjustment section 202, and the modem 2.
50. Downlink line 111, modem 300. Downlink reception processing unit 351, speed conversion units 352, 353, uplink transmission processing unit 354. Modem 300. Uplink 112. modem? 5
0 and is input back to the phase correction section 200a.

The returned input data is sent to the upstream bit adjustment unit 203.
The clock is delayed by a fixed delay amount and input to the clock conversion unit 204, where the clock is transferred to the reference clock in the central base station 10G, and then passed through the upstream bit correction unit 205 to detect the same use. The information is input to section 206 . At the same time, the intra-bit phase difference detection section 20B detects the intra-bit phase difference using the reference clock sent from the central station transmission/reception data processing section 150, and the detection result is transmitted to the MP.
U210 will be notified.

As a result, the MPLI 21G sets each of the detected values of the intra-bit phase difference to the downlink intra-bit adjustment section 202 and the uplink intra-bit adjustment section 8B 203, respectively.

Next, after changing to the above state, the MPU 210 then compares the reference multi-frame timing with the same timing of the multi-frame of uplink data in the inter-bit phase difference detection unit 209, and detects those bits. Based on the notification of the phase difference detection result, it is determined whether the bit it phase difference detection value is an even number, and if it is an even number, 1/2 of the detection value is determined.
The downlink bit fLllF section 201 and the upper reviyt"
The lm adjustment unit 205 sets each as a delay amount.

On the other hand, if the above bit-to-bit phase difference detection value is an odd number, M
P121G adds a value corresponding to the delay amount of the output to the downlink intra-bit adjustment section 202 and the uplink intra-bit adjustment section 203, respectively, and makes the value at the inter-bit phase difference detection section 209 an even number. lylp (J210 confirms that the detected value of the phase difference between bits is an even number, and then calculates the value of the detected value!,
ff is set as the delay amount in the downlink bit adjustment unit 201 and the uplink bit adjustment i'lS 211, respectively.

The above operation is repeated until the phase difference detected by the inter-bit phase difference detection section 209 becomes a gap. In this way, @lm
110a digit 11;! The adjustment is complete.

The reason why inter-bit phase adjustment is performed after intra-bit phase adjustment is because if the intra-bit phase difference is not wide enough, bit slip will occur and inter-bit phase adjustment with reference multi-frame timing will not be possible. be.

In this way, according to this embodiment, the phase can be adjusted by turning back the wired system, so that a mobile communication system as shown in FIG. 3 can be constructed. As can be seen from a comparison between FIG. 3 and FIG. 4, in FIG. 3, the receiving station 70, which was conventionally necessary, can be omitted, so that the overall system configuration can be simplified.

In addition, conventionally, for example, when a failure occurs on the working line 110a, if the working line 110a is switched to the standby @111 t1ob and the mobile radio service is continued, the phase adjustment of the line 110a, which was previously in use, is changed to the peripheral base station 601. ~60y
Since it was necessary to stop all transmission operations of n,
It is not possible to adjust the phase during the daytime when there are many calls, and it is necessary to adjust the phase at night when there are few calls.As it takes time to complete the phase adjustment, the line 110b cannot be adjusted during the day when there are many calls. If a failure occurs, it will be impossible to provide mobile wireless services.

On the other hand, according to this embodiment, from the line 110a to
When switching to 1igb, making the transmitting fi 400a inactive, and starting the transmitter 400b, the phase of the line 110a can be adjusted without wINing the line 110a. Adjustments can be initiated, thus improving mobile SM line services.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of peripheral bases 8ffi
When adjusting the phase so that there is no phase difference in the ll, it can be done by simply looping back the wired system between the central base station and the peripheral base stations, eliminating the need for a receiving station for phase adjustment, which was previously required. Therefore, the overall system configuration can be made simple and inexpensive, and since there is no need to block the line during phase adjustment, it has the following advantages: it greatly contributes to improving the service of the system. be.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram of essential parts of an embodiment of the present invention, Fig. 3 is a block diagram of a mobile communication system to which the present invention is applied, and Fig. 4 is a block diagram of a conventional mobile communication system, FIG. 5 is a block diagram of the central station shown in FIG. 4, FIG. 6 is a block diagram of the central base station shown in FIG. 4, and FIG. 7 is a block diagram of the central base station shown in FIG. FIG. 8 is a block diagram of the receiving station shown in FIG. 4. FIG. 9 is a diagram showing the frame format of the central station and the central base station gate. FIG. 10 is a diagram showing the frame format between the central base station and peripheral base stations. In the figure, 100 is a central base station, 101 is a Lt lower bit cycle delay adjustment means, 102 is a downlink intra-bit delay adjustment means, 103 is an uplink intra-bit delay adjustment means, 104 is an uplink inter-bit delay adjustment means, and 105 is an uplink inner bit delay adjustment means. phase difference detection means, 1 (16 is the upstream bit layer phase difference detection means, 107 is the control means, 11G is the existing 11 line, 111 is the downlink, 112 is the uplink, 120 is the exchange, 1301 to 130 are the surrounding bases) 131 is a downlink signal processing means, 132 is an uplink signal processing means, 200a, 200b, 200 are phase correction units, 350a, 350b, 350 are multiplexing/
Separation unit X/DMUX) is shown. (MtJ

Claims (1)

[Claims] A central base station (100) and a plurality of peripheral base stations (130_1
~130_m) is connected to the exchange (
120), and the downlink (111
) is connected such that the downlink delay at the uplink (112) is equal to the uplink delay at the uplink (112), and the central base station (
A phase adjustment method in a mobile communication system that wirelessly transmits transmission data from a mobile station (100) to a mobile station via the exchange (120) and at least one peripheral base station among the plurality of peripheral base stations (130_1 to 130_m). The central base station (100) is connected to the peripheral base station (130).
Downlink inter-bit delay adjustment means (101) and downlink intra-bit delay adjustment means (102) that separately adjust inter-bit delay and intra-bit delay of transmission data to (_1 to 130_m)
and upstream intra-bit delay adjustment means (103) and upstream inter-bit delay adjustment means (104) for separately adjusting the intra-bit delay and inter-bit delay of data input via the exchange (120); uplink intra-bit phase difference detection means (105) for detecting the intra-bit phase difference of uplink data delayed by the uplink intra-bit delay adjustment means (103); and uplink data delayed by the uplink inter-bit delay adjustment means (104). Uplink inter-bit phase difference detection means (106) for detecting the inter-bit phase difference of data
), and the phase difference detection signals of the uplink intra-bit phase difference detection means (105) and the uplink inter-bit phase difference detection means (106) are supplied, and each phase difference detection signal is 1/2 of the value of the uplink intra-bit phase difference detection signal. is set in each of the downlink intra-bit delay adjustment means (102) and the uplink intra-bit delay adjustment means (103), and then set 1/ of the even value of the uplink bit pre-phase difference detection signal.
and a control means (107) for setting 2 to each of the downlink inter-bit delay adjustment means (101) and the uplink inter-bit delay adjustment means (104), and the plurality of peripheral base stations (130_1 to 130_m) each of the downlink lines (1
11) for performing signal processing of the transmission data input from the central base station (100);
31), and the data obtained by subjecting the data taken out from the downlink signal processing means (131) to signal processing opposite to that of the downlink signal processing means (131) is transmitted to the uplink line (112) by the exchange ( 120) and an uplink signal processing means (132) that loops back to the central base station (100) via the central base station (100).