JPH04249936A - Synchronism establishing method and transmission/ reception control system - Google Patents

Abstract

PURPOSE:To reduce multiple station synchronism by taking synchronism establishment by a frame synchronizing code at every mobile station group to which the frame synchronizing code in an identification code is allocated, and deciding whether or not a station is its own station for an identification number. CONSTITUTION:When communication is performed between either first and second radio transmission equipment 2, 4, the frame synchronizing code and a data frame on which the identification number is attached are transmitted. The coincidence of the frame synchronizing code is detected at the frame synchronization detection part 8 of the second communication equipment 4 fitted in the frame synchronizing code, and synchronism is established between both radio communication equipment 2 and 4, and muting is applied to the sound circuit part of a transmission/reception part 6. Therefore, no muting is applied to the radio equipment other than the second radio equipment 4 to which the muting is applied.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention aims to establish synchronization to shorten the mute period during data transmission and reception between a fixed station (hereinafter also referred to as a base unit) and a mobile station (hereinafter also referred to as a slave unit). The present invention relates to a method and a transmission/reception control system. With the development of communication technology, mobile communication systems are now integrated into communication networks. In the communication between the handset and base unit in the mobile communication system, a shift keying modulation modem (hereinafter referred to as MSK modem) is used.
It is possible to transmit and receive not only audio signals but also data. One or more handsets that perform these two types of transmission and reception are provided for one base unit, and communicate via the base unit to other handsets or to a partner terminal device in a public communication network or mobile communication system. It is constructed so that audio signals or data can be transmitted and received simultaneously between the two. Prior to performing the simultaneous transmission and reception, each slave unit that participates in the transmission and reception establishes synchronization with the base unit for each slave unit, and then performs each separate transmission and reception. However, the method for establishing synchronization is as follows.
The communication procedure is exactly the same for the slave units that belong to the base unit, and as mentioned above, MS is used for communication between the slave unit and the base unit.
A K modem is adopted, and the transmission band used for transmitting and receiving MSK data is in the voice band, and the transmitting/receiving control system and the audio transmitting/receiving system are connected in parallel to the transmitting/receiving section on both the transmitting and receiving sides. Due to the
mute). Such muting is not only necessary for the own station, but also when transmitting and receiving is performed at other stations belonging to the base unit. Furthermore, since such a mute function hinders improvement in the response (data transfer speed and program processing speed) between the parent device and the child device, it is necessary to improve it.

0002

[Prior Art] The structure of a conventional data frame used to establish synchronization between each child device and a parent device is a data frame format as shown in FIG. This frame synchronization is used to establish synchronization among all child devices belonging to the parent device. Therefore, when one of the handsets belonging to the base unit of the mobile communication system as shown in FIG. 6 is already in communication, when a call is generated from another handset or the base unit, the Since the frame synchronization is the same, the communicating handset causes the audio system extender 74 and compressor 82 of its own station to perform a mute function in response to the frame synchronization. This mute operation is as follows. As shown in FIG. 6, for example, under the control of the CPU 42 of the fixed station 30, a data frame is sent to the mobile station 31 via the modem 60, the amplifier 50, and the radio section 52. In the mobile station 31, a modem 86 receives frame data received via a radio section 70 and an amplifier 72. modem 86
has a frame synchronization determination unit that identifies the frame synchronization code, and this determines whether the input frame synchronization code matches the frame synchronization code of the own station, and based on the match, the base unit and the own station, that is, the slave Establish synchronization with the machine. The frame synchronization code used to establish this synchronization is
This is an inverted version of the frame synchronization code placed on the data frame transmitted from the mobile station 31 to the mobile station 31, thereby identifying the direction. Establishment of this synchronization causes all slave units in communication to perform mute operations. This mute operation is a period required for the CPU 90 to judge the identification code received following frame synchronization after the synchronization is established and to obtain a match, that is, a period until reception of the identification code is completed. Then, only the child device for which the match has been found receives the data in the received data frame (see FIG. 7).

Note that in FIG. 6, the ringer detection circuit 3
8 detects a ringer at the time of an incoming call transferred via a down line 36 from an exchange (of a public switched telephone network or a mobile communication system), not shown, and the detection signal is transferred to the CPU 42. Mobile station 3 at fixed station 30
1 is used for call processing. The dial data output of the CPU 42 is also connected to the down line 36. The downlink 36 and uplink 37 are connected to a 2-wire to 4-wire conversion circuit 40. The 2-wire to 4-wire conversion circuit 40 and the ringer detection circuit 38 are connected to the central office line interface section 3.
2. Line 2-4 of the office line interface section 32
The two-wire output of the line conversion circuit 40 is connected to the inputs of an amplifier 46, a compressor 48, an amplifier 50, and a radio section 52, respectively. The output of the radio section 52 is transmitted to an amplifier 54 and an extender 56.
, and is connected to the 2-wire input of the 2-wire to 4-wire conversion circuit 40 via the amplifier 58. Amplifier 46, compressor 48, and amplifier 50, and amplifier 54, expander 56, and amplifier 5
In addition to 8, a modem 60, which will be described later, constitutes the baseband circuit section 34. EEP for speed dialing and identification code
ROM (hereinafter referred to as EEPROM) 44 is a CPU
42 accesses. The output of compressor 48 and the input of expander 56 are connected to the output and input of modem 60, respectively. The input and output of the modem 60 are:
It is connected to corresponding outputs and inputs of the CPU 42. The wireless section 52 includes a control circuit 6 controlled by the CPU 42.
It is placed under the control of 5. The CPU 42 also includes a compressor 4.
8, and a mute control output connected to the mute control inputs 41, 43 of the extender 56. A control program for performing these controls is stored in the ROM 63. Furthermore, the wireless unit 52 of the fixed station 30 is connected to the wireless unit 70 of the mobile station 31 via a wireless line. The reception output of the radio section 70 is connected to the input of a handset 78 via an amplifier 72, an extender 74, and an amplifier 76. The output of the handset 78 is
Radio section 70 via amplifier 80, compressor 82, and amplifier 84
connected to the send input of The output of amplifier 72 and the output of compressor 82 are connected to the input and output of modem 86, respectively. The output and input of the modem 86 are
90 inputs and outputs. The aforementioned amplifier 72
, an expander 74, an amplifier 76, an amplifier 80, a compressor 82, and an amplifier 84, the CPU 90 constitutes a baseband circuit section 71. Identification code PROM (hereinafter referred to as
It's called PROM. ) 92 is provided for accessing the ROM 90. The wireless section 70 is placed under the control of a control circuit 96 controlled by the CPU 90. The CPU90 has
It also has a mute control output connected to the expander 74 and the mute control input of the compressor 82. A control program for performing these controls is stored in the ROM 95.

0004

[Problem to be Solved by the Invention] As mentioned above, when communication is started between the base unit and other slave units belonging to the base unit in a slave unit that is communicating, the synchronization establishment operation described above is not performed. However, at that time, the handset that is in the middle of a call will also perform a similar synchronization establishment operation (hereinafter referred to as
This synchronization establishment operation is called synchronization with other stations). This synchronization establishment operation occurs because, unlike the transmitting side, it is unknown on the receiving side when a data frame will be transmitted to the receiving side. If such a synchronization establishment operation occurs, there will be an instantaneous interruption in the call that has been continuing until then, so it is impossible to prevent the quality of the call from deteriorating. The mute period (the period until the reception of the identification code is completed) as mentioned above delays the response between the base unit and the slave unit, so it is necessary to keep it as short as possible. .

[0005] The present invention was created in view of such technical problems, and it is possible to shorten the mute period during data transmission and reception between a first wireless communication device and a second wireless communication device. The purpose of this invention is to provide a synchronization establishment method and a transmission/reception control method that can be achieved.

[0006]

[Means for Solving the Problem] The invention according to claim 1 provides a first wireless communication device 2, a number of second wireless communication devices each identified by an identification code consisting of a frame synchronization code and an identification number. It is characterized in that the frame synchronization code is used to establish synchronization with the communication device 4. In the invention according to claim 2, as shown in FIG. 1, each of the plurality of second wireless communication devices 4 communicating with the first wireless communication device 2 includes a transmitting/receiving section 6, a frame synchronization detecting section 8, A transmission/reception control section 10;
A wireless communication system having a storage section 12 includes the following components, namely, an identification comprising a frame synchronization code used for identifying each of the plurality of second wireless communication devices 4 and an identification number in the storage section 12. storing the code and the first register 14 provided in the frame synchronization detection section 8;
a reading means 16 for reading out the identification code from the storage section 12; a second register 18 provided in the transmission/reception control section 10; and a reading means 16 for reading out the identification code from the storage section 12; a number setting means 20 to set;
a code setting means 22 for setting a frame synchronization code of the read identification code in the first register 14; a frame synchronization code set in the first register 14;
In response to the frame synchronization detecting section 8 detecting a match with the received frame synchronization code, each second frame synchronization code corresponding to the detection is detected.
A mute control means 23 mutes the audio circuit section of the transmitting/receiving section 6 in the wireless communication device 4, and a code correspondence between the identification number set in the second register 18 and the received identification number. The present invention is characterized in that a reception control means 25 is provided for causing the second wireless communication device 4 to start a reception operation.

[0007]

[Operation] When communicating between the first wireless communication device 2 and the second wireless communication device 4, a data frame carrying a frame synchronization code and an identification number is transmitted. The frame synchronization detection unit 8 of the second wireless communication device 4 that matches the frame synchronization code detects the sign of the frame synchronization code, and both wireless communication devices 2 and 4
In the meantime, synchronization is established and the audio circuit section of the transmitting/receiving section 6 is muted.

[0008] Therefore, of the number of second wireless communication devices 4 that can be identified by the identification code, only the second wireless communication device 4 to which the frame synchronization code is assigned can be muted. Therefore, the second wireless communication devices 4 other than the second wireless communication device 4 that has been muted will no longer be muted. Therefore, the degree of being muted can be reduced in terms of probability. Further, the second wireless communication device 4 is muted as described above.
As is clear from the foregoing, since the number of identification numbers is reduced, the number of identification numbers required to identify these second wireless communication devices 4 may also be reduced. This allows a reduction in data transmission time.

[0009]

Embodiment FIG. 2 shows an embodiment of the present invention. The base unit and slave unit in the conventional mobile communication system shown in FIG. 6 are configured into a base unit (fixed station) 26 and a slave unit (mobile station) 28. In addition to the above-mentioned control program, the base unit 26 also stores an initial setting program in its ROM 64, a frame synchronization register 62 is provided in the modem 61, and the slave unit 28 stores an initial setting program in its ROM 94. In addition to storing an initial setting program in addition to the aforementioned control program, and a frame synchronization register 88 provided in the modem 87, the EEPROM 4
The present invention is characterized in that an identification code constituting one characteristic part of the present invention is stored in the PROM 91, and an identification code constituting one characteristic part of the present invention is stored in the PROM 91. The identification code stored in the EEPROM 45 is also R.
The identification code stored in the OM91 is also the same, and consists of a frame synchronization code and an identification number, as shown in the data frame of FIG. This frame synchronization code and identification number have the same bit length as a conventional identification code, for example, 21 bits. Other frame parts in the data frame (
The first protection bit, BCH code, and last protection code) are
Same as before. The other components are shown in FIG. 6, that is, they are conventional components, so please refer to the above-mentioned [Prior Art] section and explain them as necessary in the following description.

2 to 6, the main unit 26 is shown in FIG.
The slave device 28 corresponds to the second wireless communication device 4 in FIG. 1 . radio parts 52, 70,
Control circuits 65, 96, amplifiers 46, 50, 54, 58,
72, 76, 80, 84, compressor 48, 82, expander 5
6, 74 correspond to the transmitting/receiving section 6 in FIG. 1, and the modem 61,
87 corresponds to the frame synchronization detection section 8 in FIG. C.P.
U42,90 corresponds to the transmission/reception control unit 10 in FIG.
PROM45 and PROM91 correspond to the storage section 12. The registers 62 and 88 correspond to the first register 14 in FIG. 1, and the ROMs 64 and 94, 102 in FIG. 4, and S2 in FIG.
corresponds to the reading means 16 in FIG. CPU42,
The registers within 90 correspond to second registers 18 of FIG. The ROMs 64 and 94 and S3 in FIG. 6 correspond to the number setting means 20 in FIG. 1, and the ROMs 64 and 94 and S4 in FIG. 6 correspond to the code setting means 22 in FIG.

Next, the operation of the present invention with the above configuration will be explained below. The base unit 26 is the fixed station 26, and the slave unit 28 is the mobile station 2.
The case where it is set to 8 will be explained. In order to put the fixed station 26 and mobile station 28 of the mobile communication system into operation, when the fixed station 26 and the mobile station 28 are turned on (step 1 in FIG.
00), ROM64 initial setting program, and R
The initial setting program of OM94 is started (1 in Figure 4).
02, see S1 in FIG. 5). By executing the initial setting program read from the ROM64, the EEPROM
The identification code stored in the CPU 45 is read out (see S2 in FIG. 5), and the identification numbers in the identification code are set in the corresponding registers in the CPU (see S3 in FIG. 5).
Also, the frame synchronization code in the identification code read from the EEPROM 45 is set in the frame synchronization register 62 in the modem 61 (see S4 in FIG. 5), and the PRO
The identification number in the identification code read from M91 is CP
The frame synchronization code in the identification code set in the register in U90 (see S3 in FIG. 5) and read out from PROM91 is stored in frame synchronization register 88 in modem 67.
(see S4 in FIG. 5).

After completing these setting processes, the fixed station 26,
and the mobile station 28 enters a normal operating state (10 in FIG.
For example, when a data frame is transmitted from the fixed station 26 to the mobile station 28, it is determined whether or not synchronization has been established based on the frame synchronization code in the data frame. Repeat the process (
(See NO. 106 in FIG. 4). The communication direction identification of the frame synchronization code used to establish this synchronization is the same as the conventional one. When synchronization is established (see YES in 106 in Figure 4)
, a mute operation is caused in each mobile station 28 while a match is determined for the identification number (1 in FIG. 4).
(see 08). After that, only the mobile station 28 that has found a match starts receiving data (110 in FIG. 4).
reference).

In the present invention, as described above, a mute operation is generated in each of the mobile stations 28 whose frame synchronization codes match, but the mobile stations 28 to which the mute operation must be generated are different from conventional mobile stations 28. 2
Since the total number of mobile stations to be muted that can be represented by one bit can be reduced to a group of mobile stations to be muted every 16 bits, the rate of occurrence of multi-station synchronization is significantly reduced compared to the conventional method, and the call quality is improved. I can do it. In addition, this reduction in the number of muted mobile stations also reduces the data length of the data frame, which improves the response between the fixed station 26 and the mobile station 28, and speeds up wireless line connections. Become.

[0014] In the above embodiment, the data frame, frame synchronization code, and identification number have specific data lengths, but the essence of the present invention is not limited to this. This will be clear to those skilled in the art.

[0015]

As explained above, according to the present invention, synchronization is established for each mobile station group to which a frame synchronization code in the identification code is assigned, and the identification code in the identification code is Since it is determined whether the number is the own station or not, it is possible to significantly reduce the occurrence of multi-station synchronization that inevitably occurs in mobile communication systems. This improves call quality, and when the identification codes are of the same length, the data length of the data frame can be shortened, which improves communication response and speeds up wireless line connections.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention.

FIG. 3 is a diagram showing a data format of the present invention.

FIG. 4 is a diagram showing the synchronization confirmation processing order of the present invention.

FIG. 5 is a diagram showing a synchronization confirmation processing flow of the present invention.

FIG. 6 is a configuration diagram of a conventional fixed station and mobile station.

FIG. 7 is a diagram showing a conventional data format.

FIG. 8 is a diagram showing a conventional synchronization confirmation processing flow.

[Explanation of symbols]

2 First wireless communication device (fixed station 26) 4 Second wireless communication device (mobile station 28) 6 Transmission/reception unit (wireless unit 5
2, 70, control circuit 65, 96, amplifier 46, 50, 5
4, 58, 72, 76, 80, 84, compressor 48, 82
, extender 56, 74) 8 Frame synchronization detection section (modem 61, 87) 10 Transmission/reception control section (CPU 42, 90)
)12 Storage section (EEPROM45, PROM91)
14 First register (registers 62, 88) 16
Reading means (ROM64, 94, 102 in FIG. 4, S2 in FIG. 5) 18 Second register (register in CPU 42, 90)

Claims (2)

[Claims] 1. Establishing synchronization between a first wireless communication device (2) and a plurality of wireless communication devices (4) each identified by an identification code consisting of a frame synchronization code and an identification number, comprising: A synchronization establishment method characterized by using the frame synchronization code. 2. Each of the plurality of wireless communication devices (4) communicating with the first wireless communication device (2) includes a transmitting/receiving section (6), a frame synchronization detecting section (8), and a transmitting/receiving control section (10). ), and a storage section (12), wherein the storage section (12) includes a frame synchronization code and an identification number used to identify each of the plurality of wireless communication devices (4). a first register (14) for storing an identification code and provided in the frame synchronization detection section (8); a reading means (16) for reading out the identification code from the storage section (12); and a transmission/reception control section. (10); a number setting means (20) for setting the identification number of the read identification code in the second register (18); code setting means (22) for setting a frame synchronization code of an identification code in the first register (14); Mute control means (23) for muting the audio circuit section of the transmitting/receiving section (6) in each wireless communication device (4) corresponding to the detection in response to the frame synchronization detecting section (8) detecting the frame synchronization detecting section (8); ) and the second register (1
8), and reception control means (25) for causing the wireless communication device (4) whose code corresponds to the received identification number to start a reception operation. control method.