JPH11340897A - Base station device for radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the base station device for a radio communication system, where deterioration in the reception performance or damage of a reception circuit due to out of synchronism by monitoring the synchronization state of a transmission reception switching frame among plural radio sections for controlling the synchronization state. SOLUTION: A comparison circuit 20 compares the phases of transmission reception switching frame signals S1, S2 fed to a radio section (#1) 13, a radio section (#2) 14 and recognizes a phase error. When the phase error exceeds a permissible value, the operation of at least either of the radio section (#1) 13 or the radio section (#2) 14 is stopped once, and after the transmission reception switching frame signal S1, S2 have been controlled so that the phased error is less then the permissible value, the operation is restarted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station apparatus for a radio communication system such as a simplified portable telephone system, and more particularly, to a base station apparatus having a plurality of radio sections for synchronizing transmission / reception switching frames between radio sections. It relates to state monitoring and control.

[0002]

2. Description of the Related Art In recent years, a simplified portable telephone system (hereinafter abbreviated as PHS) using micro cells has been developed as one of digital mobile communication systems, and practical use has begun.

The PHS is constituted, for example, as follows. FIG. 10 is a diagram showing the basic configuration. That is, a plurality of base stations CS1 to CSm are distributed and transmit control information signals. Base stations CS1-CSm are PHS
Service Integrated Digital Network (ISD)
NW). Each of the terminals PS1 to PSn receives and synchronizes control information signals output from any of the base stations CS1 to CSm in the areas Z1, Z2,..., Zm formed by the base stations CS1 to CSm, respectively. When there is an incoming call from the network side, or when a call is made from the terminal side, a wireless line is established and connected with the base station,
Wired telephones TEL1 to TELk or terminals PS1 to PS from the connected base station via the ISDN network INW or the ISDN network INW and the subscriber telephone network SNW.
Communication is possible between n.

Here, the base stations CS1 to CSm and the terminal PS
Time division multiple access (TDMA: Time Division)
nMultiple Access), and time division bidirectional multiplexing (TDD: Tim) as a transmission method.
e Division Duplex) system.

[0005] The frame structure of the TDMA-TDD system is as follows.
It consists of a forward link in which four transmission slots are time-division multiplexed and a reverse link in which four reception slots are time-division multiplexed. One frame length is 5 msec, transmission and reception transmission speed is 384 kbps, and one slot length is 625 μsec.
c, the transmission rate per slot is set to 32 kbps except for the error correction code and the like.

[0006] A center CC is connected to the ISDN network INW via a packet network PNW. The center CC includes a location registration management device CC1 and a base station operation management device CC2.

[0007] The location registration management device CC1 comprises terminals PS1 to PS1.
Information on location registration is collected from the PSn and the base stations CS1 to CSm via the ISDN network INW and the packet network PNW, and registers and manages in which area Z1 to Zm the terminals PS1 to PSn are currently located, respectively.

[0008] The base station operation management device CC2 exchanges control information with the base stations CS1 to CSm to manage the base stations CS1 to CSm. Well, such a P
In the base stations CS1 to CSm of the HS system, as described above, since the frame configuration includes four slots for transmission and reception, the control channel 1 and the communication channel 3 (1C3T)
In the base stations CS1 to CSm having more communication channels, the radio units of the communication channel 4 (4T) are added, and a plurality of radio units are concentrated in one place. .

As described above, when the radio units are concentrated, it is necessary to synchronize the transmission / reception switching frame between the radio units in order to avoid erroneously receiving the transmission signal of the other radio unit. .

In this type of conventional base station apparatus, out-of-synchronization of a transmission / reception switching frame between radio units is detected by software and transmission of radio waves is stopped. There has been a problem that a time lag occurs.

[0011]

As described above, in a base station apparatus having a plurality of radio units, out-of-synchronization of a transmission / reception switching frame between radio units is detected by software and radio wave transmission is stopped. However, there has been a problem that a time lag occurs from the loss of synchronization to the stop of radio wave transmission.

[0012] When the transmission / reception switching frame is thus out of synchronization, a strong transmission wave of one radio unit in the base station apparatus becomes an interference wave with respect to the reception of the radio unit of the other system, and the reception performance is reduced. It deteriorates remarkably.

Further, since there is a time lag from the out-of-synchronization to the stoppage of radio wave transmission, the radio unit of another system receives the strong transmission wave of one radio unit immediately. In the worst case, the radio unit There was a problem that the receiving circuit was damaged.

[0014] The present invention has been made in view of such a problem, and a base station apparatus having a plurality of radio units includes:
An object of the present invention is to provide a base station apparatus of a wireless communication system capable of preventing deterioration of reception performance or damage to a reception circuit due to loss of synchronization by monitoring and controlling the synchronization state of a transmission / reception switching frame between wireless units. .

[0015]

According to the present invention, in a base station apparatus of a wireless communication system having a plurality of radio units, a phase of a transmission / reception switching frame signal for controlling transmission / reception switching of a plurality of radio units is compared and monitored. When the phase error exceeds an allowable value, the operation of at least one of the plurality of radio units is stopped.

With such a configuration, it is possible to prevent the reception performance from being degraded or the receiving circuit from being damaged due to loss of synchronization in a plurality of radio units. Here, after the operation of at least one wireless unit is stopped, the operation of the stopped wireless unit may be restarted after controlling the phase error of the transmission / reception switching frame signal to be equal to or less than an allowable value.

Further, after the operation of the stopped radio unit is resumed, the phase of the transmission / reception switching frame signal for controlling the transmission / reception switching of the plurality of radio units may be compared and monitored.

Further, the base station device of the wireless communication system is a base station device of a simplified portable telephone system having four or more communication slots and a plurality of radio units, and transmits and receives signals of control slots. Based on the phase of the transmission / reception switching frame signal, the phase of the transmission / reception switching frame signal that controls transmission / reception switching of a plurality of radio units is compared and monitored. If the phase error exceeds an allowable value, the signal of the control slot is transmitted / received. The operation of the radio units other than the radio unit that performs the operation may be stopped.

Further, the allowable value may be changed from outside the base station apparatus. Also, the present invention provides a base station apparatus of a wireless communication system having a plurality of wireless units, wherein a signal obtained by performing a logical sum of a transmission circuit selection signal for selecting a transmission circuit of each of the plurality of wireless units is transmitted by all wireless units. It is characterized in that it is used as a transmission circuit selection signal for selecting a circuit. With such a configuration,
It is possible to prevent deterioration of reception performance or damage to a reception circuit due to loss of synchronization in a plurality of radio units.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following drawings, the same symbols indicate the same or corresponding parts.

(First Embodiment) A first embodiment of the present invention will be described. In the first embodiment, the phases of the transmission / reception switching frame signals of the two radio units are compared and monitored. If the phase error exceeds an allowable value, the operation of at least one of the radio units is temporarily stopped, and the transmission / reception is stopped. The operation is resumed after controlling so that the phase error of the switching frame signal becomes equal to or less than the allowable value.

FIG. 1 shows the configuration of the base station apparatus according to the first embodiment. That is, since the base station apparatus shown in FIG. 1 is a PHS base station apparatus having four or more communication slots, two radio units, namely, the radio unit (# 1) 13 and the radio unit (# 2) 14 Have. Also, as described above, PH
Since the S system is a TDMA-TDD system, the radio units (# 1) 13 and the radio units (# 2) 14 share radio wave transmission and radio wave reception with one antenna 11 and 12, respectively.

More specifically, the transmission and reception switching frame signal is time-divided into transmission and reception as shown in FIG.
After four slots are occupied at the transmission slot timing TX, four slots are occupied at the reception slot timing RX.

The radio control unit (# 1) 15 and the radio control unit (#
2) 16 controls channel selection and slot multiplexing / demultiplexing as TDMA channel control, and transmits and receives the transmission / reception switching frame signals S1 and S2 to a transmission / reception switching frame signal generation unit (# 1) 17 and transmission / reception switching frame signal generation unit (# 2) The transmission / reception switching frame signals S1 and S2 are used to control the radio unit (# 1) 13 and the radio unit (# 2) 14 to perform transmission and reception.

The transmission / reception switching frame signal S
The reference timing for S1 and S2 is generated by the synchronization circuit 19. The synchronization circuit 19 is connected to the control bus 24 from the CPU 22.
Is controlled via

Radio unit (# 1) 13, Radio unit (# 2) 14
The phase of the transmission / reception switching frame signals S1 and S2 supplied to the transmission / reception switching frame signals S1 and S2 is compared by the comparison circuit 20, and the phase error between the transmission and reception switching frame signals S1 and S2 is recognized. The comparison circuit 20 is controlled by the CPU unit 22 via the control bus 24, and starts the phase comparison and recognizes the phase error.

The phase comparison described here is necessary for the following reasons. Transmission / reception switching frame signals S1, S2
Are the same in the transmission portion and the reception portion as shown in the relationship between A and B in FIG. 2, when the radio section (# 1) 13 is transmitting, the radio section (# 2) 14 is also transmitting, (#
1) When the signal 13 is received, the wireless unit (# 2) 14 also receives. However, the transmission / reception switching frame signals S1, S
2 are transmission portions as shown in the relationship between B and C in FIG.
It may not match in the receiving part.

That is, as shown in FIG. 3, the radio control unit (#
1) When the wireless control section (# 2) 16 generates the transmission / reception switching frame signals S1 and S2, the synchronization circuit 19 outputs a synchronization signal as shown in FIG. Are supplied to the PLL circuit (# 1) 25 and the PLL circuit (# 2) 26 of the wireless control unit (# 2) 16, respectively. PLL circuit (# 1) 25, PLL circuit (# 2)
At 26, a synchronization signal as shown in FIG. 4b is generated and supplied to the transmission / reception switching frame signal generation unit (# 1) 17 and the transmission / reception switching frame signal generation unit (# 2) 18 to transmit / receive the switching signal. (# 1) 17, the transmission / reception switching frame signal generation unit (# 2) 18 receives the transmission / reception switching frame signal S as shown in FIG.
1. Generate S2. Therefore, even if the same synchronization signal is supplied from the synchronization circuit 19, the PLL circuit (# 1)
25 and the PLL circuit (# 2) 26, there may be a phase difference between the locking timings, so the PLL circuit (# 1)
25 and the synchronization signal output from the PLL circuit (# 2) 26, a phase difference occurs, and the transmission / reception switching frame signals S1, S2
2 will also be out of phase.

Transmission / reception switching frame signals S1, S2
However, assuming that the transmission part and the reception part do not match, even when the radio unit (# 1) 13 is transmitting, the radio unit (# 1)
2) may be reception, and the radio unit (# 2) may be transmitting even when the radio unit (# 1) 13 is receiving.

Here, as described above, since the base station apparatus is a PHS base station apparatus having four or more communication slots, the antennas 11 and 12 are the same or very close to each other, and the transmitting part and the receiving part Do not match, the transmission wave of one wireless unit of the own base station becomes an interference wave with respect to the reception of the other wireless unit of the own base station, and the reception performance is significantly deteriorated.

Therefore, in order to prevent this, the phase of the transmission / reception switching frame signals S1 and S2 is compared in the comparison circuit 20, and a phase error is obtained. I do.

Here, when the comparison circuit 20 compares the phases of the transmission / reception switching frame signals, the monitoring is performed on the basis of the transmission / reception switching frame signal of the radio section transmitting the control channel, that is, the signal of the control slot. The phase error of the transmission / reception switching frame signal on the wireless unit side can be monitored. For example, assuming that the radio section (# 1) 13 is a radio section transmitting a control slot signal, the phase error of the transmission / reception switching frame signal S2 is monitored with reference to the transmission / reception switching frame signal S1.

The allowable value of the phase error is, for example,
When the guard bit set between the slots is 40 μsec, the value may be about 5 to 20 μsec. The comparison circuit 20 is provided with a register (not shown) for setting the permissible value. The setting of the permissible value in this register is performed by the CPU unit 22.

The tolerance can be set externally and can be made variable. For example, Center C
When a permissible value is instructed from C to the base station apparatus via the line, a signal indicating the permissible value from the center CC is input from the line control unit 21 to the CPU unit 22. After being stored in the RAM 23, the CPU 22 reads this from the RAM 23 and sets it in the register of the comparison circuit 20.

FIG. 5 shows a sequence for performing this phase comparison, in which the comparison circuit 20 is controlled by the CPU section 22 of the base station apparatus, and the transmission / reception switching frame signals S1, S2
Read the phase error of. That is, the CPU unit 22 causes the comparison circuit 20 to start the frame phase comparison (31), and when the phase error is equal to or less than the allowable value, the comparison circuit 20 reports the frame phase comparison result to the CPU unit 22 as normal. (3
2). FIG. 5 shows a case where the phase error is equal to or smaller than the allowable value.

FIG. 6 shows a case where the phase error exceeds the allowable value as a result of reading the phase error according to the sequence of FIG. That is, the CPU unit 22 causes the comparison circuit 20 to start the frame phase comparison (31), and when the phase error exceeds the allowable value, the comparison circuit 20 notifies the CPU unit 22 of the frame phase comparison result as abnormal. Report (32A).

The CPU section 22, which has received the report that the phase comparison result is abnormal, sets the radio section (# 1) 13 and the radio section (#
2) At least one of the 14 operations is stopped.
For example, when the radio unit (# 1) 13 is a radio unit transmitting a signal of a control slot, the operation of the radio unit (# 2) 14 is stopped (33).

After the operation is stopped, the CPU section 22 operates the synchronization circuit 19 and the radio control sections 15 and 1 so that the phase error between the transmission / reception switching frame signals S1 and S2 becomes equal to or less than an allowable value.
6 is controlled. That is, the synchronization circuit 19 and the wireless control unit 1
5 and 16 are instructed to establish the frame synchronization (34), and when the frame synchronization is established, the report is received (35). Specifically, for example, at least one of the PLL circuits 25 and 26 of the wireless control units 15 and 16, for example, a PLL circuit (# 2)
26 is re-locked.

Thereafter, the CPU section 22 controls the comparison circuit 20 again (36, 37), stops after confirming that the phase error of the transmission / reception switching frame signals S1, S2 is less than the allowable value. The operation of the wireless unit that has been in operation is resumed (38).

After restarting the operation of the radio unit which has been stopped, the transmission / reception switching frame signals S1 and S2 supplied to the radio unit (# 1) 13 and the radio unit (# 2) 14 are again phase-synchronized by the comparison circuit 20. The phase errors of the transmission / reception switching frame signals S1 and S2 are recognized.

(Second Embodiment) Next, a second embodiment of the present invention will be described. This second embodiment is based on 2
A signal obtained by ORing the transmission circuit selection signals of the two radio units is used as the transmission circuit selection signals of the two radio units, and the two radio units are simultaneously controlled.

FIG. 7 shows the configuration of the base station apparatus according to the second embodiment. In the figure, reference numerals 43 and 44 denote a radio unit (# 1) having antennas 41 and 42, a radio unit (# 2), 45 a logical sum generation unit, and 46 and 47 a transmission circuit selection signal generation unit (# 1). ), The transmission circuit selection signal generators (# 2), 48, and 49 are wireless control units (#
1), a wireless control unit (# 2), 50 is a line control unit, and 51 is an out-of-synchronization detection circuit.

A control signal S10 is exchanged between the line control unit 50 and the radio units (# 1) 43 and (# 2) 44. The radio control unit (# 1) 48 and the radio control unit (# 2) 49 perform channel selection and slot multiplexing / demultiplexing as TDMA channel control, generate radio frame signals S11 and S12, and select a transmission circuit. The signal is supplied to the signal generator (# 1) 46 and the transmission circuit selection signal generator (# 2) 47, respectively. The transmission circuit selection signal generator (# 1) 46 and the transmission circuit selection signal generator (#
2) 47 is a radio unit (# 1) 43 and a radio unit (# 2) 4 in accordance with the TDMA-TDD transmission slot timing.
The transmission circuit selection signals S13 and S14 for switching the four antennas 41 and 42 to the transmission circuit (Tx) side are generated, respectively, and supplied to the logical sum generation unit 45. OR generation unit 4
The output signal of No. 5 is supplied to the transmission / reception switch (Sw) of the radio section (# 1) 43 and the radio section (# 2) 44 as an all-transmitting-circuit selection signal signal S15.

FIG. 8 is a timing chart in the case where the wireless units having two systems, that is, the wireless unit (# 1) 43 and the wireless unit (# 2) 44 are operating synchronously. In this case, the radio unit (# 1)
43 and the radio section (# 2) 44 are synchronized, the transmission circuit selection signals S13 and S14 remain in phase, and the all transmission circuit selection signal S1 which is the output signal of the logical sum generation section 45.
5 are also in phase, and the radio unit (# 1) 43 and the radio unit (#
2) In the operation 44, as shown in FIGS. 8A and 8B, transmission and reception are selected without any trouble.

Next, FIG. 9 is a timing chart in the case where the wireless units having two systems, that is, the wireless unit (# 1) 43 and the wireless unit (# 2) 44 are out of synchronization with each other and operate asynchronously. .
In this case, since the radio section (# 1) 43 and the radio section (# 2) 44 are asynchronous, the transmission circuit selection signal S13 and the transmission circuit selection signal S14 are out of phase.

However, the total transmission circuit selection signal S15, which is the output signal of the logical sum generation unit 45, is different from the transmission circuit selection signal S1.
3. When any one of the transmission circuit selection signals S14 selects the transmission circuit, the transmission circuit is selected, and both the radio unit (# 1) 43 and the radio unit (# 2) 44, as shown in FIGS. When the transmission circuit of the system is selected, the own system also performs the transmission circuit selection operation.

Therefore, the radio unit (# 1) 43 and the radio unit (#
2) In the case of 44, the strong transmission wave transmitted by the wireless unit of the nearest other system is not erroneously received, and as an effect, the wireless unit (# 1) 43 and the wireless unit (# 2) 44 When the synchronization is lost, the radio unit (# 1) 43 and the radio unit (# 2)
Forty-four reception circuits (Rx) can be protected. Note that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist.

[0048]

As described above, according to the present invention,
In a base station apparatus having a plurality of radio units, by monitoring and controlling the synchronization state of a transmission / reception switching frame between radio units, it is possible to prevent deterioration of reception performance or damage to a reception circuit due to loss of synchronization.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a base station apparatus according to a first embodiment of the present invention.

FIG. 2 is a timing chart showing a transmission / reception switching frame signal according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a more detailed configuration of a main part according to the first embodiment of the present invention.

FIG. 4 is a timing chart showing output signals of respective units for describing an operation of generating a transmission / reception switching frame signal according to the first embodiment of the present invention.

FIG. 5 is a sequence diagram showing a phase comparison operation (when the result is normal) in the first embodiment of the present invention.

FIG. 6 is a sequence diagram showing a phase comparison operation (when the result is abnormal) and a subsequent control operation in the first embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a base station device according to a second embodiment of the present invention.

FIG. 8 is a timing chart for explaining a transmitting circuit selecting operation (in the case of a synchronous operation) of the radio unit according to the second embodiment of the present invention.

FIG. 9 is a timing chart for explaining a transmission circuit selection operation (in the case of an asynchronous operation) of the wireless unit according to the second embodiment of the present invention.

FIG. 10 is a block diagram showing a basic configuration of a PHS.

[Explanation of symbols]

 11, 12 antenna 13 radio section (# 1) 14 radio section (# 2) 15 radio control section (# 1) 16 radio control section (# 2) 17 transmission / reception switching frame signal generation section (# 1) 18) Transmission / reception switching frame signal generation unit (# 2) 19 ... Synchronization circuit 20 ... Comparison circuit 21 ... Line control unit 22 ... CPU unit 23 ... RAM 24 ... Control bus 25 ... PLL circuit (# 1) 26 ... PLL circuit ( # 2) 41, 42 ... Antenna 43 ... Radio unit (# 1) 44 ... Radio unit (# 2) 45 ... OR generation unit 46 ... Transmission circuit selection signal generation unit (# 1) 47 ... Transmission circuit selection signal generation unit (# 2) 48 ... Wireless control unit (# 1) 49 ... Wireless control unit (# 2) 50 ... Line control unit 51 ... Out-of-synchronization detection circuit Z1, Z2, ..., Zm ... Area CS1-CSm ... Base station PS1- PSn: Terminal INW: Service Service integrated digital network (ISDN network) SNW… Subscribed telephone network PNW… Packet network CC… Center CC1… Location registration management device CC2… Base station operation management device

Claims (6)

[Claims] In a base station apparatus of a wireless communication system having a plurality of radio units, a phase of a transmission / reception switching frame signal for controlling transmission / reception switching of the plurality of radio units is compared and monitored, and a phase error is set to an allowable value. A base station apparatus for a wireless communication system, wherein the operation of at least one of the plurality of wireless units is stopped when the number exceeds the predetermined number. 2. The method according to claim 1, wherein after the operation of at least one radio unit is stopped, the phase error of the transmission / reception switching frame signal is controlled to be equal to or less than an allowable value, and then the operation of the stopped radio unit is restarted. The base station apparatus of the wireless communication system according to claim 1. 3. The system according to claim 2, wherein after restarting the operation of the stopped radio unit, the phase of a transmission / reception switching frame signal for controlling transmission / reception switching of the plurality of radio units is compared and monitored. A base station device of a wireless communication system. 4. A base station apparatus of a simplified portable telephone system having at least four communication slots and a plurality of radio units, wherein said base station apparatus of said radio communication system transmits and receives control slot signals. Based on the phase of the transmission / reception switching frame signal of the unit, the phase of the transmission / reception switching frame signal for controlling transmission / reception switching of the plurality of radio units is compared and monitored, and when the phase error exceeds an allowable value, the signal of the control slot is The base station apparatus of a wireless communication system according to any one of claims 1 to 3, wherein operation of a wireless unit other than the wireless unit transmitting and receiving the wireless communication is stopped. 5. The base station apparatus of a wireless communication system according to claim 1, wherein said allowable value can be changed from outside the base station apparatus. 6. A base station apparatus for a radio communication system having a plurality of radio units, wherein all the radio units transmit a signal obtained by calculating a logical sum of a transmission circuit selection signal for selecting a transmission circuit of each of the plurality of radio units. A base station apparatus for a wireless communication system, wherein the base station apparatus is used as a transmission circuit selection signal for selecting a circuit.