JP3105852B2 - Mobile communication system and channel switching method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system and a channel switching method thereof, and more particularly, to a mobile communication system capable of forcibly switching a currently used communication channel without interrupting communication. It relates to a channel switching method.

[0002]

2. Description of the Related Art A conventional mobile communication system of this kind and a channel switching method thereof will be described with reference to the drawings.

FIG. 4 is a block diagram showing an example of a conventional mobile communication system.

FIG. 4 shows the contents of this conventional mobile communication system disclosed in Japanese Patent Application Laid-Open No. 63-159529, in which a mobile terminal 104 is connected to a public base under the control of an exchange 103 via a radio base station 101. It is connected to the telephone network 105, and the communication path at this time uses the communication path 135.

[0005] When the exchange 103 detects that the usage rate of the communication path 135 with the radio base station 101 has become equal to or more than a reference value, the exchange 103 sends a signal to the remote processor 114 of the radio base station 101. A forced communication channel switching instruction order a is transmitted.

[0006] The radio base station 101 measures the communication level of the mobile terminal, and when it finds a mobile terminal 104 lower than the communication level instructed by the exchange 103, it issues a communication channel switching request order b of the mobile terminal 104 to the exchange 103. To the communication control device 132. This is done under the expectation that if the communication channel is switched to another radio base station, the communication level will increase.

[0007] The switching center 103, as in the prior art, the mobile terminal 1
When 04 is switched to the wireless base station 102, it is determined that communication is possible, and the communication channel is forcibly switched from the communication path 135 to the communication path 136.

[0008]

In this conventional mobile communication system and its channel switching method, an unnecessary mobile terminal to be subjected to forced communication channel switching is selected by a radio base station, thereby enabling unnecessary channel switching. Although it is possible to alleviate the congestion of the signal path between the radio base station and the exchange, but when the function has to be temporarily stopped for the purpose of strengthening the function of the radio base station side, Although the "maintenance regulations" prohibit the call connection process using the relevant device after the restriction, there is no remedy method such as moving the communication calls that exist in the device, and the function is performed by the communication calls that exist for a long time. There was a problem that the reinforcement work could not be performed smoothly, which hindered a user who tried to communicate thereafter.

The reason for this is that, for example, in the case of a system stop for the purpose of function enhancement, etc., after the maintenance call is enforced, the call is stopped after there is no communication call in the corresponding device. The radio base station equipment is treated as maintenance,
In the worst case, the mobile station cannot enter standby because it ignores its existence.

[0010]

SUMMARY OF THE INVENTION A mobile communication system according to the present invention comprises a plurality of radio base station equipment for transmitting and receiving to and from a plurality of mobile stations in respective service zones; Telecommunications line equipment for exchanging communication signals from the PSTN to the plurality of radio base station equipments; and an operation and maintenance monitoring console connected to the telecommunications line equipments and performing maintenance monitoring of the entire system. The console, when trying to stop the function of the specific first wireless base station equipment due to factors including maintenance and inspection of the plurality of wireless base station equipment and reinforcement of the equipment, the specific first wireless base station equipment Receiving a response to the station facility for a radio status inquiry for all channels of the telephone call being processed;
A response to the inquiry of the unused channel to the second radio base station equipment in the plurality of radio base station equipment is received, and the channel of all the communication calls of the first radio base station equipment is transmitted to the second radio base station equipment. Notifying means for notifying the communication line equipment to switch to an unused channel of the second radio base station equipment,
Further, the operation and maintenance monitor has display means for displaying respective response information from the first and second wireless base station equipment to the inquiry about the wireless status and the unused channel.

[0011] A channel switching method for a mobile communication system according to the present invention comprises a plurality of radio base station facilities for transmitting and receiving to and from a plurality of mobile stations in respective service zones; Telecommunications line equipment for exchanging communication signals to the plurality of radio base station equipment, and an operation and maintenance monitoring console connected to the telecommunications line equipment and performing maintenance monitoring of the entire system, When the function of the specific first wireless base station equipment is to be stopped due to factors including maintenance and inspection and equipment reinforcement of the plurality of wireless base station equipments,
Receiving a response to the inquiry about the radio status of all the channels of the telephone call being processed to the radio base station equipment of the plurality of radio base station equipments, and receiving a response to the second radio base station equipment among the plurality of radio base station equipments. Receiving a response to a channel inquiry and notifying the communication line facility to switch the channel of all of the speech calls of the first radio base station equipment to an unused channel of the second radio base station equipment. Notify by means.

A channel switching method for a mobile communication system according to the present invention comprises: a plurality of radio base station-side equipment for transmitting and receiving to and from a plurality of mobile stations in respective service zones; Telecommunications line equipment for exchanging communication signals from the communication system to the plurality of radio base station equipment, and an operation and maintenance monitor connected to the telecommunications line equipment and performing maintenance monitoring of the entire system. When the function of the specific first wireless base station is to be stopped due to factors including maintenance and inspection of the plurality of wireless base station equipment and reinforcement of the equipment, the "channel switching essential parameter request" is sent to the first wireless base station. The radio base station equipment relays the telecommunication line equipment to the radio base station equipment and transmits the radio base station equipment. To send a "wireless state inquiry", the mobile station in the call is the "radio state inquiry"
After receiving the “radio status report”, the first radio base station equipment transmits the “radio status report” to the first radio base station equipment after measuring the status of the channel in use. Switching destination radio base station equipment that can be reflected as
After selecting a station and editing as a "channel switching parameter notification", relaying the communication line equipment to the operation and maintenance console and transmitting it, the operation and maintenance console receives the "channel switching essential parameter notification", Requesting channel switching by transmitting a `` wireless channel instruction '' containing an instruction for channel switching to the telecommunication line equipment, the telecommunication line equipment receiving the `` wireless channel instruction '',
Based on the instruction content, a “wireless channel trajectory request” for activating an unused channel to the second wireless base station equipment serving as the switching destination and the “in-use first wireless base station equipment serving as the switching source” When a "channel switching command" for stopping the channel is transmitted, and the second radio base station equipment serving as the switching destination receives the "radio channel activation request", the switching burst is activated and the synchronization burst is transmitted during the call. When the first radio base station equipment of the switching source receives the “channel switching command”, the first radio base station equipment transmits the content to reflect the “channel switching designation” to the first radio base station equipment. When the radio base station equipment receives the "communication channel activation completion" from the mobile station during the call, the radio base station equipment notifies the telecommunication line equipment as a "channel switching completion report", When the telecommunications circuit facilities is to receive the "channel switching completion report", it is transmitted to the operation and maintenance monitoring console by editing the "forced handover success notification" based on the contents of the report.

[0013]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a system configuration according to an embodiment of the present invention.

In FIG. 1, a digital car telephone system according to the present embodiment comprises a mobile station 1, radio base station-side facilities 2 and 3 for transmitting and receiving radio waves to and from the mobile station 1, and radio base station-side facilities 2 and 3. , 3 and a telecommunications line facility 4 for connecting a call signal from the ISDN 6 or PSTN 7 to the radio base station-side facilities 2 and 3, and an operation and maintenance monitor 5 for monitoring the operation and maintenance of the entire system. Make up.

Hereinafter, these components will be described in detail.

1) Mobile Station 1 This mobile station 1 satisfies the function based on the standard RCR-STD27 of the digital car telephone system.

2) Radio Base Station-Side Facilities 2, 3 In this embodiment, the following two types of equipment are collectively shown for the radio base station-side facilities 2, 3 respectively. Each of the radio base station-side facilities 2 and 3 is functionally the same facility.

Radio transceivers 21 and 31 Devices that enable communication with the mobile station 1 using antennas 23 and 33 using radio.

Radio base station controllers 22, 32 These are devices for controlling the radio transmission / reception 21, 32, enabling communication relating to call control with the telecommunication line equipment 4, and mainly with the server 52 of the operation and maintenance monitoring console 5. Communication for operation and maintenance.

3) Telecommunications line facility 4 The telecommunications line facility 4 in the present embodiment is an electronic exchange for mobile communications. The mobile communication electronic exchange 41 is opposed to the radio base station-side facilities 2 and 3 to realize circuit switching with a communication call and to perform communication with another network (ISDN).
6, PSTN7) and a series of devices that enable line switching.

4) Operation / Maintenance Monitor 5 In the present embodiment, the operation / maintenance monitor 5 is a server 52, a workstation (WS) 51, and an L connecting the two devices.
This is made up of AN52. The server 52 receives a request to the radio base station-side facilities 2 and 3 and the telecommunications line facility 4 and a response to the request through the network in the own network,
The hardware and software for processing the response contents are collectively shown. The server 52 has the following two types.

Communication server A server that performs communication processing with the network and the workstation (WS) 51.

Database server A server that stores a series of databases such as the names of the radio base station-side facilities 2 and 3 and the number of lines, which are a huge number.

A workstation (WS) 51 is an engineering workstation that holds a bitmap display, and communicates with a communication server 52 via a LAN 53.

FIG. 2 is a sequence diagram showing an example of the operation in the present embodiment.

Next, a channel switching operation procedure according to the present embodiment will be described with reference to FIGS.

1) When the operation / maintenance monitoring console 5 recognizes that the line screen has been opened, the operation / maintenance monitoring console 5 transmits a “line use state request” to the radio base station side equipment 2 which is the corresponding equipment.

2) Upon receiving the "line use status request", the radio base station side equipment 2 immediately confirms the line use status in its own equipment, edits the "line use status response", and edits the "line use status response".
Reply to

3) Upon receiving the "line use status response", the operation and maintenance monitor 5 immediately reflects the contents on the screen and displays the line in use on all the lines in use.

4) The operation and maintenance monitor 5, which recognizes that the channel (CH) on which the line is being used is displayed on the screen of the operation and maintenance monitor 5, selects “channel switching” to the radio base station side equipment 2. "Required parameter request" is sent.

5) "Channel switching essential parameter request"
The wireless base station-side equipment 2 that has received the message finds the corresponding mobile station 1 and transmits a “wireless state inquiry” to the mobile station 1 in a format based on RCR-STD27.

6) The mobile station 1 that has received the “wireless status inquiry” uses a method based on RCR-STD27,
“Wireless status report a” is transmitted to the wireless base station side equipment 2.

7) The radio base station-side equipment 2 that has received the “radio status report a” attaches a symbol that can recognize the radio base station-side equipment and the received electric field strength to the top three other cells as candidates based on the contents. To the operation and maintenance monitoring console 5 as "notification of channel switching essential parameter".

8) "Notification of channel switching essential parameter"
The operation and maintenance console 5 that has received the command switches the screen to the switching destination cell selection screen and displays the received essential parameters on the screen.

9) When the operation / maintenance monitoring console 5 recognizes that the candidate cell on the switching destination candidate cell selection screen has been selected, it issues a “line use status request” to the radio base station side equipment 3 which is a switching destination candidate. Send

10) The switching-destination radio base station-side equipment 3 receiving the "line use status request" performs the same operation as in 2) above, and replies to the operation and maintenance console 5 with a "line use status response". I do.

11) Upon receiving the "line use status response" from the switching destination radio base station equipment 3, the operation and maintenance monitor 5 immediately transmits the switching source radio base station equipment 2 including the channel selected in the above item 4). "Line usage status response" received with the channel
Is switched to a screen which can preferentially display the empty channel of the switching destination radio base station side equipment 3 from the contents of the above, and the response content is reflected on the display.

12) When the operation / maintenance monitoring console 5 recognizes that the drag and drop operation has been performed from the corresponding channel of the switching source radio base station side equipment 2 to the vacant channel of the switching destination radio base station side equipment 3, it is instructed. A “wireless channel instruction” including a channel as an information element is transmitted to the telecommunication line equipment 4.

13) Upon receiving the “wireless channel instruction”, the telecommunication line equipment 4 transmits a “wireless channel activation request” to the wireless base station equipment 3 to be switched to.

14) Upon receiving the “radio channel activation request”, the radio base station equipment 3 immediately activates the radio channel and transmits “synchronization burst 1” to the mobile station 1 based on the RCR-STD 27.

15) The telecommunications line equipment 4 transmits the “wireless channel activation request” of the item 13) to the wireless base station equipment 3 as the switching destination, and then operates the wireless base station equipment 2 as the switching source. A “channel switching command” reflecting the information element on the switching destination channel in the wireless channel instruction from the maintenance monitoring console 5 is transmitted.

16) Upon receiving the “channel switching command”, the radio base station side equipment 2 sends the mobile station 1 RCR-STD 2
7 "Switch destination wireless channel designation" is transmitted.

17) The mobile station 1 that has received the "designation of the switching destination wireless channel" processes the synchronization burst and the communication burst by the method based on the RCR-STD27.

18) Upon receiving the response to the communication burst from the mobile station 1, the radio base station-side equipment 3 recognizes the completion of the TCH activation by the method based on the RCR-STD 27, and indicates that the channel switching has been completed. The notification is sent to the telecommunication line equipment 4.

19) Upon receiving the “channel switching completion notification”, the telecommunications line equipment 4 requests the wireless base station side equipment 2 that has been the switching source to release the line in the wireless section.

20) Upon receiving the “radio channel release request”, the radio base station side facility 2 releases the corresponding radio section line.

21) The telecommunications line equipment 4 sends the "forced channel switching success notification" to the operation and maintenance console 5 after requesting the "release of wireless channel" of the above 20).

22) The operation and maintenance console 5 that has received the “forced channel switching success notification” displays success of forced channel switching using the window on the screen.

FIG. 3 is a diagram showing transition of the display screen of the operation and maintenance console in this embodiment.

Next, a description will be given, with reference to FIGS. 1 and 3, of a CH switching operation performed by a maintenance person at the operation and maintenance console 5 in the present embodiment.

The maintenance person determines for some reason the function of the radio base station side equipment 2 (hereinafter referred to as ☆☆ 局 station) positioned in FIG. 1 to stop and confirms the existence of a communication call in the relevant equipment in FIG. Open the line screen on the operation and maintenance console shown in FIG.

Check the existing communication call from the line screen display of the station shown in FIG.

One line to be switched is determined, and the screen display of the corresponding line is clicked with the mouse.
Here, as shown in FIG. 3B, CH20 is targeted.

Channel switching essential parameters relating to the CH20 clicked in the above item 2 are displayed on the screen as shown in FIG.

One station determined to be the best from the displayed parameters is determined. Here, the radio base station equipment 3 (hereinafter referred to as xxx station) positioned in FIG. 1 is targeted, and the xxx station on the screen is clicked with a mouse as shown in FIG. 3D.

As shown in FIG. 3 (e), after a part of the line screen of the switching source station and the switching destination station is displayed, the switching destination channel is changed to xxx. One of the stations is determined (here, the switching destination channel is set to XXX station CH3), and the ☆ × ☆ station CH20 is changed to × using the mouse.
XX Drag and drop to station CH3.

As shown in FIG. 3 (f), a message indicating that the channel switching was successful and a display on the line screen indicating that the corresponding communication call has shifted to CH3 indicate that the desired channel switching was successful. Can be confirmed.

As described above, in the digital car telephone system according to the present embodiment, the radio base station-side facilities 2, 3
When the function of only the specific radio base station side equipment 2 is stopped for regular inspection and maintenance, reinforcement of the equipment, etc., the communication call existing in the same equipment can be easily transmitted from the operation and maintenance monitoring console 5. The channel switching function of the telecommunications line equipment 4 can be forcibly activated by a simple remote operation, and the channel can be switched to the line of another radio base station-side equipment 3 which is not affected by the function stoppage.

Although the description of the present embodiment is directed to a digital car telephone system (TDMA system) based on the radio industry standard RCR-STD27, the same applies to the radio industry industry standard. R
Based on the CR-STD28, the RCR-STD27 shown in FIG.
It is possible to change the processing of the part based on the digital codeless telephone and the simple portable telephone system.

[0061]

As described above, according to the present invention, there are provided a plurality of radio base station equipment for transmitting and receiving to and from a plurality of mobile stations in each service zone, and the mutual or I / O communication between the plurality of mobile stations.
Telecommunications line equipment for exchanging communication signals from the SDN and PSTN to the plurality of radio base station equipments, and an operation and maintenance console connected to the telecommunications line equipments and performing maintenance monitoring of the entire system; The monitoring console, when trying to stop the function of the specific first wireless base station equipment due to factors including maintenance and inspection of the plurality of wireless base station equipment and equipment reinforcement, etc. Receiving a response to the radio status query for all the channels of the telephone call being processed to the facility, and querying the second radio base station facility in the plurality of radio base station facilities for an unused channel query. Notifying means for receiving the response and notifying the communication line equipment of switching the channels of all communication calls of the first radio base station equipment to unused channels of the second radio base station equipment, It can have the effect shown below.

The first effect is that it is possible to improve the efficiency of the operation of stopping the function of the radio base station equipment, and to make a call during communication in the radio base station equipment whose function is stopped, a temporary equipment failure, and the like. Thus, the communication call in the radio base station equipment can be rescued when the function is expected to stop sometime.

The reason is that the function of the radio base station equipment is stopped by a remote operation from the operation and maintenance monitoring console for monitoring the entire system, and the influence of the function stop is given because there are a plurality of radio base station equipment in the system. This is because a communication call during communication by the wireless base station equipment whose function is stopped can be moved to a channel of the wireless zone covered by the wireless base station equipment which is not affected by the communication.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration according to an embodiment of the present invention.

FIG. 2 is a sequence diagram illustrating an example of an operation according to the present embodiment.

FIG. 3 is a diagram showing transition of a display screen of an operation and maintenance monitoring console in the present embodiment.

FIG. 4 is a block diagram illustrating an example of a configuration of a conventional mobile communication system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mobile station 2, 3 Radio base station side equipment 4 Telecommunication line equipment 5 Operation and maintenance monitoring console 6 ISDN 7 PSTN 21, 31 Radio transceiver 22, 32 Radio base station controller 41 Mobile communication electronic exchange 51 Workstation (WS) 52 server 53 LAN

Claims (10)

(57) [Claims] 1. A plurality of radio base station facilities for transmitting and receiving to and from a plurality of mobile stations in respective service zones, and a plurality of radio base station facilities for mutual transmission of the plurality of mobile stations or from the ISDN and PSTN to the plurality of radio base station facilities. Telecommunications line equipment for exchanging communication signals, and an operation and maintenance monitoring console connected to the telecommunications line equipment and performing maintenance monitoring of the entire system, wherein the operation and maintenance monitoring console is one of the plurality of radio base station facilities. Specified by factors including maintenance inspections and equipment reinforcement
Receiving a response to the specific first radio base station equipment in response to an inquiry about the radio status of all the channels of the telephone call being processed when the function of the radio base station equipment is to be stopped; A response to the inquiry of the unused channel to the second radio base station equipment in the plurality of radio base station equipment is received, and the channel of all the communication calls of the first radio base station equipment is transmitted to the second radio base station equipment. 2. A mobile communication system, comprising: a notification unit that notifies the communication line facility of switching to an unused channel of the second radio base station facility. 2. The operation and maintenance console further comprises display means for displaying respective response information from the first and second wireless base station equipment to the inquiry about the wireless status and the unused channel. The mobile communication system according to claim 1, wherein 3. A plurality of radio base station facilities for transmitting and receiving to and from a plurality of mobile stations in respective service zones, and a plurality of radio base station facilities for mutual transmission of the plurality of mobile stations or from the ISDN and PSTN to the plurality of radio base station facilities. Telecommunications line equipment for exchanging communication signals, and an operation and maintenance monitoring console connected to the telecommunications line equipment and performing maintenance monitoring of the entire system, wherein the operation and maintenance monitoring console is one of the plurality of radio base station facilities. Specified by factors including maintenance inspections and equipment reinforcement
Receiving a response to the specific first radio base station equipment in response to an inquiry about the radio status of all the channels of the telephone call being processed when the function of the radio base station equipment is to be stopped; A response to an inquiry of an unused channel to a second radio base station equipment in the plurality of radio base station equipment is received, and the channel of all the speech calls of the first radio base station equipment is changed to the second channel. 2. A channel switching method for a mobile communication system, comprising: notifying the communication line equipment by a notification unit so as to switch to an unused channel of the second radio base station equipment. 4. A plurality of radio base station-side facilities for transmitting and receiving to and from a plurality of mobile stations in respective service zones, and the plurality of mobile stations mutually or from the ISDN and PSTN to the plurality of radio base station facilities. Telecommunications line equipment for exchanging communication signals, and an operation and maintenance monitor connected to the telecommunications line equipment and performing maintenance monitoring of the entire system, wherein the operation and maintenance monitor is connected to the plurality of radio base station equipment. When the function of a specific first wireless base station is to be stopped due to factors including maintenance inspection and equipment reinforcement, etc., a "channel switching essential parameter request" is sent to the first wireless base station equipment via the telecommunication line. Relay the equipment and send it,
The radio base station equipment which has received the "channel switching essential parameter request" transmits a "radio state inquiry" to a mobile station in a call, and the method for switching channels in a mobile communication system. 5. The mobile station during a call, after receiving the “radio status inquiry”, transmits a “radio status report” to the first radio base station equipment after measuring the status of the channel in use, and When receiving the "radio status report", the radio base station equipment selects three switching target radio base station equipments that can be reflected as channel switching destinations, and issues a "channel switching parameter notification".
5. The method according to claim 4, wherein after editing, the communication line equipment is relayed to the operation and maintenance console and transmitted. 6. The operation and maintenance monitor, upon receiving the “channel switching essential parameter notification”, transmits a “wireless channel instruction” including a channel switching instruction to the telecommunication line equipment to perform channel switching. 6. The channel switching method for a mobile communication system according to claim 4, wherein 7. Upon receiving the “wireless channel instruction”, the telecommunication line equipment activates an unused channel to the second wireless base station equipment to be switched to based on the content of the instruction. 7. The mobile communication system according to claim 4, wherein the first wireless base station equipment serving as a switching source transmits a "channel switching command" for stopping a channel in use. Channel switching method. 8. The second radio base station equipment serving as the switching destination, upon receiving the “radio channel activation request”, transmits a synchronization burst after activating the switched channel to the mobile station that is in communication, and 8. The original first radio base station equipment, upon receiving the "channel switching command", transmits the content so as to reflect the content in "switch destination radio channel designation". The channel switching method of the mobile communication system according to the above. 9. The second radio base station equipment serving as the switching destination transmits a “communication channel activation completed” message from the mobile station that is currently talking.
9. The channel switching method for a mobile communication system according to claim 4, further comprising the step of notifying the telecommunication line equipment of a "channel switching completion report" upon receipt of the notification. 10. The telecommunications line facility, upon receiving the “channel switching completion report”, edits a “forced handover success notification” based on the content of the report and transmits the edited message to the operation and maintenance console. Claims 4, 5,
10. The channel switching method for a mobile communication system according to 6, 7, 8, and 9.