JP6362969B2 - Radio communication system and radio network controller - Google Patents

Description

  The present invention relates to a radio communication system that performs a radio call between a mobile station and a mobile station via a base station, a radio call between a mobile station and a command board via a base station, and in particular, between base stations. The present invention relates to a digital mobile communication system that can reduce the frequency interference and expand the call area.

FIG. 4 shows a schematic configuration example of a wireless communication system related to this technical field. In this wireless communication system, an SCPC method (Single Channel Per Carrier) in which one carrier is assigned to one channel for transmitting voice data is used. The SCPC digital wireless system is defined by, for example, the digital communication system standard ARIB STD-T61.
In FIG. 4, a radio network controller 401 includes a plurality of mobile stations (mobile station (A)) connected via an operation console (also referred to as a command console, control console, or communication console) 406 and a base station (A) 402. 404, a function of exchanging the line of the mobile station (B) 405 connected via the base station (B) 403).

FIG. 1 shows a block diagram of a radio network controller according to the present technical field and the present invention, and a circuit switching mechanism will be described.
In FIG. 1, the failure monitoring IF unit 101 has a function of monitoring the internal state of the radio network controller and notifying an external device of the state.
The call control unit 102 has a function of controlling system call connection and call disconnection.

The switching control unit 103 is a main function of the radio network controller, and as described with reference to FIG. 4, the switching control unit 103 functions as a switch for exchanging lines between the console 406, the mobile station (A) 404 and the mobile station (B) 405. Have.
The operation unit IF unit 105 is an interface of the operation console 108. Specifically, the operation unit 108 has a function of analog / digital (A / D) conversion of sound from the operation console 108, and digital / analog (D / A) converted sound. It has a function of outputting to the console 108.

The base station (A) IF unit 106 has a speech encoding / decoding function and an interface function with the base station 109. The base station (B) IF unit 107 also has the same function as the base station (A) IF unit 106.
The concentrator / distributor 104 has a function of concentrating / distributing ARCNET for transmitting control information in the radio network controller and a function for transmitting voice signals as a highway function (HighWay).

  Patent Documents 1 and 2 below describe SCPC digital radio systems related to ARIB STD-T61.

JP 2011-71703 A JP 2013-48323 A

  In the wireless communication system described above, when a speech coding method based on the CELP (Code-Excited Linear Prediction) method is used as a speech coding method, past speech data is stored due to its nature. In addition, since coding is performed by reuse, there is a problem in that the data after speech coding does not match unless the beginning of speech data input to the speech coding unit is the same between a plurality of base stations.

Here, in a radio communication system in which a plurality of base stations perform radio transmission at the same frequency, when interference is reduced by synchronizing radio transmission between the plurality of base stations and transmitting at the same timing, transmission is performed between the plurality of base stations. Even if the timing is matched, there is a problem that the effect of reducing interference cannot be expected unless the transmission data match.
The present invention has been made to solve the problems of the background art, and in a system that synchronizes between a plurality of base stations, the timing of transmitting data between the plurality of base stations matches the transmission data. The purpose is to let you.

  A typical first configuration of the wireless communication system of the present invention for solving the above-described problems is as follows. That is, in a radio communication system including a plurality of base stations, a plurality of mobile stations, and a radio channel controller that wirelessly connects them, the radio channel controller and the plurality of base stations are synchronized, and the radio channel When the control device simultaneously transmits data at the same frequency from at least two adjacent base stations of the plurality of base stations, the control device issues a reset instruction to the encoding units of these at least two adjacent base stations, and A wireless communication system, wherein two adjacent base stations reset an encoding unit based on the reset instruction.

  Moreover, the typical 2nd structure of the radio | wireless communications system of this invention is as follows. That is, in a radio network controller that wirelessly connects a plurality of base stations and a plurality of mobile stations, the plurality of base stations are synchronized and data is transmitted to at least two adjacent base stations of the plurality of base stations. A radio network controller characterized by transmitting a reset instruction for resetting encoding units of at least two adjacent base stations when transmitting simultaneously at the same frequency.

  ADVANTAGE OF THE INVENTION According to this invention, when several base stations carry out radio transmission simultaneously with the same frequency, the same data can be transmitted reliably.

It is a figure which shows the block diagram of the radio network controller which concerns on embodiment of this invention. FIG. 5 is a diagram showing a command list (Table 1) corresponding to system management slot communication according to the embodiment of the present invention. It is a figure which shows the table | surface (Table 2) of the register map of the broadcast reset command which concerns on embodiment of this invention. It is a figure which shows the example of schematic structure of the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows the operation | movement control flowchart figure to embodiment of this invention. It is a figure which shows the communication flowchart figure in the slot communication for system management which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a radio network controller according to the present technical field and the present invention as described in the description of the background art, and the description of the points described in the background art is omitted. The function of the radio network controller can be incorporated into the console.
In FIG. 1, an operation of performing voice communication between the console 108, the mobile station (A) 111, and the mobile station (B) 112 will be described.

When a call is simultaneously made to the mobile station (A) 111 and the mobile station (B) 112 from the console 108, the call control unit 102 receives the call connection request, and the console 108, the mobile station 111, and the operation are transmitted to the exchange control unit 103. The console 108 and the mobile station 112 are instructed to connect the lines via the ARCNET control signal line.
Upon receiving this instruction, the exchange control unit 103 outputs the voice signal input from the console 108 to the mobile station (A) 111 and the voice signal input from the console 108 to the mobile station (B) 112. Connect the HighWay path.
After that, the audio signal input from the console 108 is A / D converted by the console IF unit 105 and output as a digital signal (uLaw) on HighWay.
Thereafter, the data is input to the exchange control unit 103 via the aggregation / distribution unit 104, passes through the pre-connected HighWay path, and also passes through the aggregation / distribution unit 104 to the base station (A) IF unit 106 and the base station (B). The data is output to the IF unit 107.

The base station (A) IF unit 106 and the base station (B) IF unit 107 include a speech encoding unit (encoding unit), and the speech encoding unit encodes the uLaw format into an encoding scheme for wireless transmission. , Output to the base station (A) 109 and the base station (B) 110, respectively.
The base station (A) 109 and the base station (B) 110 transmit speech-encoded speech to the mobile station (A) 111 and the mobile station (B) 112, respectively, on the radio. This is received by the mobile station (A) 111 and the mobile station (B) 112, and the speech-encoded speech is decoded and reproduced.

Here, the radio network controller and the base station move from the base station (A) 109 and the base station (B) 110 by synchronizing the clock with GPS (Global Positioning System) and transmitting them with superframe timing. Radio transmission is performed at the same frequency to the station (A) 111 and the mobile station (B) 112.
As described above, since the same data is transmitted from a plurality of base stations at the same frequency, it is possible to reduce, for example, a wireless insensitive area at the boundary of a plurality of wireless areas.

FIG. 5 shows a flowchart of operation control in the embodiment of the present invention. A description will be given along the operation control flow.
(501): Select a base station to be transmitted on the console. In the above description, the base station (A) and the base station (B) are selected.
(502): Press the handset press button on the console.
(503) (501): Information of (502) is notified to the call control unit via the ARCNET in FIG. 1, and the call connection is started.
(504): In order to transmit voice from the console to the base station (A) and the base station (B), a path setting command is sent to the exchange control unit via the ARCNET.
(505) (506): Paths are connected so that the voice input from the console is output to the base station (A) and the base station (B) by the exchange control unit. At this time, the audio signal input from the console to the exchange control unit via HighWay shown in FIG. 1 is input to the base station (A) IF unit and the base station (B) IF unit.
(507): The exchange control unit writes a reset instruction to the base station (A) and base station (B) voice CODEC in the system management slot communication register, and broadcasts via HighWay to the base station (A) A reset command is sent to the IF unit and the base station (B) IF unit. (Details will be described later (FIG. 6).)
(508) (509): The base station (A) IF unit and the base station (B) IF unit that have received the reset command by broadcast decode the reset command and reset the target audio CODEC unit.
(510) (511): After reset, input audio data is encoded.
(512) (513): A superframe number is assigned to the data after speech coding.
(514) (515): Data is transmitted wirelessly to the base station (A) and the base station (B).

  As described above, the exchange control unit issues a reset instruction to a plurality of base stations, and each base station that has received the reset command resets the target speech codec according to the reset command (particularly (507), (508) , (509)), it is possible to reduce the radio insensitive area at the boundary of the plurality of radio areas.

Here, a mechanism for issuing a reset command to the voice CODEC, a system management slot communication procedure, and a mechanism thereof will be described.
FIG. 6 is a communication flowchart in the system management slot communication according to the embodiment of the present invention.
FIG. 2 shows a command list (Table 1) corresponding to the slot communication for system management according to the embodiment of the present invention.
FIG. 3 shows a table (Table 2) of the broadcast reset command register map according to the embodiment of the present invention.

The system management slot behaves as a single master serial bus, the exchange control unit becomes a bus master, and the base station IF unit becomes a bus slave to communicate system management information.
As shown in FIG. 6, when receiving the command packet, the base station IF unit returns an acknowledge packet of Package ID = own number. For the system management of this board, it is determined that the communication is completed when the acknowledge packet is normally received.
In this embodiment, the broadcast command (h′4) shown in Table 1 (FIG. 2) is used.
In this embodiment, octets 6 to 37 in Table 2 (FIG. 3) correspond to the base station IF units, and each base station IF unit implements 8 channels of audio CODECs. (= 32 × 8) audio CODEC can be reset at the same time.
Note that the audio CODEC is reset when “1” is set at the bit position of the audio CODEC to be reset, and is not reset when “0”.

  According to the above-described embodiment, when a plurality of base stations are selected and voice is transmitted, it is possible to realize a radio communication system that simultaneously resets and encodes the target voice CODEC, thereby performing radio transmission at the same frequency. It is possible to provide a wireless communication system that can reduce a dead zone at an area boundary that occurs.

According to an embodiment of the present invention, in a radio communication system including a plurality of base stations, a plurality of mobile stations, and a radio network controller that wirelessly connects them,
The radio network controller and the plurality of base stations acquire clock synchronization,
Command data from the radio network controller is transmitted at the same frequency from at least two adjacent base stations of the plurality of base stations,
A means for instructing the base station to reset a desired audio codec;
The base station which has received the reset command is a wireless communication system characterized by comprising means for resetting a target voice codec in accordance with the reset command.

Further, according to the embodiment of the present invention, in the radio network controller of the radio communication system configured by a plurality of base stations, a plurality of mobile stations, and a radio network controller that wirelessly connects them,
Means for performing control to transmit command data at the same frequency to at least two adjacent base stations of the plurality of base stations from the radio network controller;
In the case of transmitting the command data, it comprises means for performing control to acquire clock synchronization to be simultaneously transmitted to a plurality of corresponding base stations,
The radio network controller further comprises means for instructing at least two adjacent base stations of the plurality of base stations to reset a desired voice codec. It is a control device.

In addition, this invention is not limited to the said embodiment, It cannot be overemphasized that it can change variously in the range which does not deviate from the summary.
In addition, the present invention is understood not only as a system for executing processing according to the present invention, but also as an apparatus and method, a program for realizing such a method and system, and a recording medium for recording the program. can do.
Further, the present invention may be configured such that the CPU performs control by executing a control program stored in a memory, or may be configured as a hardware circuit.

101 .. Fault monitoring IF unit, 102 .. Call control unit, 103 ... Exchange control unit, 104 ... Aggregation / distribution unit, 105 ... Console IF unit, 106-107 ... Base station IF unit, 108, 406 ··· Console, 109, 402 ··· Base station (A), 110, 403 · · Base station (B), 111, 404 · · Mobile station (A), 112, 405 · · Mobile station (B), 401... Wireless line control device, 501 to 515... Each operation means (flow).

Claims (2)

A plurality of base stations, and a plurality of mobile stations connected to said plurality of base stations, and radio network controller and said plurality of mobile stations and said plurality of base stations wirelessly connected in a wireless communication system comprising ,
The radio network controller and said plurality of base stations synchronized, the radio network controller, when to transmit simultaneously on the same frequency from the at least two adjacent base stations of said data a plurality of base stations, A wireless communication system, wherein a reset instruction is issued to the encoding units of at least two adjacent base stations, and the at least two adjacent base stations reset the encoding units based on the reset instruction. A radio network controller that is connected to a plurality of base stations and wirelessly connects the plurality of base stations and a plurality of mobile stations ,
When synchronizing with the plurality of base stations and transmitting data simultaneously at the same frequency from at least two adjacent base stations of the plurality of base stations, encoding units of these at least two adjacent base stations A radio network controller that transmits a reset instruction for resetting.