JP3002308B2 - Adjacent call bandwidth reservation connection method in mobile communication network - Google Patents

Abstract

PURPOSE:To provide the reservation connection system without forced interruption of a speech even when a mobile station enters an adjacent speech band having no idle speech channel in which an idle speech channel of a mobile communication network is efficiently utilized. CONSTITUTION:The mobile body communication network is made up of a mobile station 6 having a means to send mobile information (position information and direction information) of its own station to radio base stations A-G, a radio base control station 4 formed to discriminate an adjacent speech zone existing in the progressing direction of the mobile station 6 based on the mobile information signal sent from the mobile station in the speech state or in the holding state and sending a reservation instruction signal of an idle speech channel to a radio base station of an adjacent zone, and the radio base stations A-G retrieving the idle speech channel of its own station based on a reservation instruction signal sent from the radio base control station 4 to acquire (reserve) the channel and allocating a reserved speech channel to the mobile station 6 when the mobile station in the speech state or the holding state enters the speech zone of its own station from other station speech zone to implement required line connection control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adjoining speech band reservation connection system in a mobile communication network, and more particularly, to a case where a mobile station during a call moves from one speech band to another speech band adjacent to the band. And a preferred adjacent call band reservation connection method.

[0002]

2. Description of the Related Art In general, mobile communication (for example, automobile telephone)
Then, a communication network is configured by arranging a plurality of radio base stations at predetermined intervals, and when a mobile station moves from one speech band to another speech band adjacent to the band during a call, the communication partner Are switched to connect the communication line. However, if there is no free communication channel in the adjacent communication band, the connection of the communication line in the communication band cannot be made, so that the communication of the mobile station is forcibly interrupted with the entry into the new communication band. Will be.

Conventionally, in order to prevent such a failure, when a mobile station is in a call in one call band, a search is made for a free call channel in another call band adjacent to the call band and the mobile station is searched for a call. When a mobile station moves from one call band to any adjacent call band, a reserved call channel of a destination call band is allocated to the mobile station and a call line is connected. Has been adopted. However, in this method, it is not possible to identify in which direction the mobile station is moving, so that it is necessary to reserve an empty call channel of all adjacent call bands for one mobile station. is there. As a result,
If there are a large number of mobile stations during a call, a situation occurs in which all of the prepared free communication channels are reserved and it is impossible to respond to a new call by another mobile station. In addition, since the conventional method cannot predict in advance which adjacent call band the mobile station actually enters, an empty call channel exists in the call band even in some adjacent call bands. In such a case, it is not possible to give an advance notice of line disconnection. As a result, the mobile station in a call state enters the call band without knowing that there is no free call channel in the adjacent call band in the traveling direction,
A failure occurs in which the call is forcibly interrupted.

On the other hand, the radio base station is provided with a function of accepting a reservation of a communication line connection, and a communication band called by the mobile station (when the calling mobile station moves to another communication band before the line connection, If there is no free call channel in that call band)
There has been proposed a method in which a radio base station in the communication band monitors a communication channel of the own station in response to a reservation request of a mobile station, and performs necessary line connection control in response to the occurrence of an idle communication channel (for example, a method has been proposed). See JP-A-2-262729). However, this method reserves a line connection of a communication band to which the mobile station currently belongs, and does not reserve a line connection of a communication band other than the communication band belonging to the mobile station (for example, an adjacent communication band).

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mobile communication system in which an available communication channel of a communication network can be used very efficiently, and a mobile station enters an adjacent communication band having no available communication channel. It is still another object of the present invention to provide an improved reservation connection method that does not involve forced interruption of a call.

[0006]

In order to achieve the above object, in the reservation connection method according to the present invention, a mobile information signal indicating the position and traveling direction of the own station is transmitted to the radio base station. Using a mobile station equipped with means for. The movement information signal is sent to the radio base station via the radio base station. The radio base station controls the progress of the mobile station based on a mobile information signal sent from a mobile station in a call state or a hold state (including a case where there is no vacant channel and the line connection is in a hold state; the same applies hereinafter). An adjacent communication band in the direction is determined, and a reservation command signal for an idle communication channel is transmitted to the wireless base station in the adjacent band. On the other hand, the radio base station searches and captures (reserves) its own vacant communication channel based on the reservation command signal sent from the radio base control station, and the mobile station in the communication state or the hold state is used by another station. When entering the communication band of the own station from the communication band, a reserved communication channel is allocated to the mobile station to perform necessary line connection control.

[0007] The movement information indicating the position and the traveling direction of the mobile station includes movement information indicating that the mobile station has entered an overlapping area with the adjacent speech band, for example, a mechanical or optical gyro. Detection is performed by a known direction detecting means using a compass or a communication satellite, a method of comparing and measuring the electric field strength of a communication radio wave between the mobile station and the wireless base station, or the like.

[0008]

When the mobile station, the radio base station, and the radio base control station of the mobile communication network are configured as described above, the line connection is reserved only for the adjacent call band in the traveling direction of the mobile station in the talking state or the holding state. It becomes possible to perform control, and it becomes possible to effectively use an available communication channel of an adjacent communication band other than the traveling direction of the mobile station for another mobile station.
In addition, it is possible to prevent a failure in which a free communication channel of a specific communication band is all reserved by a mobile station in a communication state in a neighboring adjacent communication band.

[0009] Particularly in the case of a car telephone, the mobile station frequently changes the traveling direction to a call state or a hold state, and a single call is often completed within a single call band. For this reason, even if only the adjacent communication band in the traveling direction of the mobile station is to be reserved, it is extremely efficient to reserve the line connection of the adjacent communication band for all the mobile stations in the talking state or the holding state. bad. However, a problem of this kind is that when a mobile station in a call state or a hold state in one call band reaches an overlapping area with an adjacent call band in the traveling direction, a reservation command signal is sent to the radio base station in the adjacent band. The above problem can be easily solved by configuring the radio base station to transmit.

[0010] In addition, in the prior art, it was not possible to identify which adjacent call band the mobile station actually enters. Therefore, as long as an empty call channel exists in a part of the adjacent call band, the line is uniformly used. Although it was not possible to give an advance notice of cutoff, according to the reservation connection method of the present invention, the line connection is reserved only for the adjacent communication band in the traveling direction of the mobile station. Before the mobile station in the state or the hold state enters the adjacent communication band that is not in the idle communication channel, it is possible to configure so as to notify both parties of the line cutoff. Moreover,
As a preferable additional effect of being able to give an advance notice of line disconnection, the radio base station stops the line connection when the mobile station in the talk state or the hold state enters the talk band of the own station having no free talk channel. The system may be configured so that the line connection is performed again after waiting for a subsequent call, or the line connection may be suspended and the communication channel of the own station monitored, and the necessary line connection control performed in response to the occurrence of an idle communication channel. It is possible to arbitrarily select either of the configurations to perform the configuration. The line connection control by the latter configuration is as follows.
It can be configured to be performed automatically or when there is a request from one or both of the callers.

[0011] When the latter configuration is selected, the radio base station determines the next adjacent speech band in the traveling direction after the mobile station enters a speech band having no free speech channel, and determines the next adjacent speech band. Also transmits an idle communication channel reservation command signal to the wireless base station. For this reason, the mobile station that has moved from one call band to another call band moves to the next adjacent call band without succeeding in connecting to the line in the call band of the movement destination (that is, in the hold state). Even in such a case, it is possible to reserve the line connection control for the next adjacent call band. In this case,
The transmission of the reservation command signal by the radio base station is performed when the mobile station that has entered the speech band with no vacant channel reaches the overlapping area of the speech band and the next adjacent speech band for the above-described reason. It is desirable to configure.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the drawings. FIG. 1 to FIG. 3 are system diagrams showing the entire configuration of an embodiment of an adjacent traffic band reservation connection system according to the present invention. Each of these figures shows a reservation connection system having the same structure. However, in order to explain three kinds of different line connection control operations, the expressions are slightly changed. FIG. 4 shows a functional configuration of an example of a mobile station used in the present embodiment. FIG. 6 to FIG.
5 is a flowchart illustrating a line connection control operation according to an embodiment of the present invention. Please also refer to the following description of operation.

1 to 3, reference numeral 1 denotes a subscriber telephone unit, 2 denotes an exchange, 3 denotes a central control unit attached to the exchange, 4
Is the radio base station, 5 is the central control unit attached to the station,
Reference numeral 6 denotes a mobile station, _{A to G} denote a plurality of radio base stations arranged at predetermined intervals, and Z _{A to} Z _G denote communication bands (service areas in which communication can be performed) shared by these radio base stations. In FIG. 4, reference numeral 40 denotes a communication antenna device with a radio base station (not shown); 41, a radio transmitting / receiving device; 42, a voice communication signal control device; 43, a mobile station telephone device;
5 is a transmitter and receiver of the telephone apparatus, 46 is a central control unit attached to the mobile station, 47 is a voice guidance signal generator, 48 is a mobile information processor, and 49 is a mobile information detector.

First, the mobile station shown in FIG. 4 will be described. The mobile information detecting device 49 is a device for detecting information on the position and traveling direction of the mobile station. It is configured using the mechanical gyrocompanse. In addition, the movement information indicating the position of the mobile station, particularly the movement information indicating that the mobile station has entered the overlapping area of the adjacent communication band is, for example, comparatively measuring the electric field strength of the radio wave emitted from the receivable radio base station. This can also be detected. The movement information processing device 48 includes, in addition to the movement information obtained by the movement information detection device 49,
This is a device for processing so that various types of movement information signals generated in the mobile station can be used. The mobile information signal subjected to necessary processing by the mobile information processing device 48 is transmitted to the wireless base station (not shown) together with other necessary signals via the wireless transmitting / receiving device 41 and the antenna device 40 under the control of the central control device 46. )).

Next, with reference to FIG. 1, mobile station 6 will be described line connection control when moving from passband Z _D drawings center to passband Z _C of the left side of the drawing. The position of the mobile station 6 and the direction in which the mobile station 6 is moving are determined by the mobile station 6.
It can be easily identified by analyzing the movement information signal sent from.

The base control station 4, upon identifying that the mobile station 6 has reached the overlap region Z _CD with passband Z _C moves the passband Z _D, passband in the traveling direction of the mobile station 6 It is configured (programmed) to determine Z _C and transmit a reservation command signal for an idle communication channel to the radio base station C. Upon receiving the command signal, the radio base station C immediately searches for a free communication channel of the own station, and if there is a free communication channel, captures the channel and reserves it for the mobile station 6. Next, the radio base station 4 determines that the mobile station 6 has exceeded the overlap area Z _CD and
_When it is determined that the terminal has entered _C , a connection command signal for a communication line is transmitted to the wireless base station C. The radio base station C that has received the command signal allocates a reserved communication channel to the mobile station 6 and executes necessary line connection control.

The reservation control adjacent communication lines may also be performed before the mobile station 6 has reached the overlap region Z _CD. However, the call and possibly be finished within passband Z _D of the mobile station 6, considering the possibility of Hen' traveling direction of the mobile station 6 after the adjacent communication line reservation, reservation control, the mobile station 6 is a limit region of passband Z _D, in other words, it is more desirable to carry out when it reaches the overlap region Z _CD with passband Z _C of the traveling direction and passband Z _D.

As a result of the search for a free communication channel by the radio base station C, if all the communication channels are reserved or in use and there is no vacancy, the radio base station C notifies the radio base control station 4 of “no free communication channel”. Send a notification signal of
The notification signal is also transferred to the radio base station D and the exchange 2 via the radio base control station 4.

The radio base station D that has received the report signal indicating “no available communication channel” transfers the report signal to the mobile station 6 by radio. Radio transmitting / receiving device 41 of mobile station 6
(See FIG. 4) extracts the notification signal from the radio frequency signal from the radio base station D and retransmits the notification signal to the central control unit 46. The device translates the content of the notification signal and provides voice guidance. The signal is sent to the signal generator 47. Voice guidance signal generator 4
7 generates a line cut-off notice signal by voice, for example, "Your mobile station will soon enter another call band, but the call will be cut off because there is no free call channel in the new call band." Handset 25 of telephone device 23
Alert the caller via. On the other hand, in the exchange 2 receiving the notification signal, the central control device 3 operates the voice guidance signal generation device (not shown) to generate a similar voice announcement signal, and joins using the handset of the telephone device 1. Alert the other party.

When the mobile station 6 in the talking state or the holding state enters the local station communication band ZC having no vacant channel, the radio base station _C ,
The line connection to the mobile station 6 is interrupted, and a necessary line connection control is performed (programmed) again after waiting for a subsequent call, or the line connection to the mobile station 6 is suspended and the self-connection is stopped. The communication channel of the station is monitored, and a configuration (program) is performed so as to perform necessary line connection control in response to the occurrence of an idle communication channel.

In the latter case, it is desirable to include an appropriate question for confirming the intention of the caller in the voice guidance signal of the line cut-off notice. Then, after listening to the voice guidance, the caller can indicate whether to stop the call or to wait for an available call channel to continue the call. The intention to cancel the call is indicated by on-hook of the handset or by dialing, for example, a # symbol. On the other hand, the intention to continue the call is indicated by, for example, dialing the * symbol. When there is an indication of the intention to continue the call, it is desirable to add voice guidance as to whether to wait while holding the handset or to put the handset on hook and wait.

When one or both of the callers desire to continue the call, the base station control station 4 transmits a communication channel monitoring command signal to the base station C. The radio base station C which has received the command signal immediately starts monitoring the local station communication channel, if the free communication channel occurs before the mobile station 6 enters the own station passband Z _C is the communication channel After the mobile station 6 enters, the call channel is allocated to the mobile station and necessary line connection control is executed. On the other hand, when the mobile station 6 is empty communication channel is not generated prior to entering the own station passband Z _C is
Even after the mobile station 6 enters, the communication channel of the own station is continuously monitored, and a necessary line connection control is executed after the occurrence of an empty communication channel.

In the above-described line connection control, as shown in FIG. 2, the mobile station 6 transmits three or more communication bands (for example, Z _C , Z _D , Z
_{The same} operation can be performed even when entering the overlapping area Z _CDF of _F ). That is, the fact that the mobile station 6 has moved to the talking state or the hold state and has moved to the overlapping band Z _CDF can be identified by, for example, comparing and measuring the electric field strengths of the radio waves emitted from the radio base stations C, D, and F. . Further, the traveling direction of the mobile station 6 can be easily detected by, for example, a gyrocompass mounted on the mobile station. As a result,
The radio base station 4 is a mobile information processing device 48 of the mobile station 6.
(Figure 4) by analyzing the movement information sent from, it is possible to estimate that the mobile station 6 is moving the overlap region Z _CDF toward the example passband Z _F.
Subsequent line connection control is exactly the same as in FIG.

FIG. 3 shows that the mobile station 6 has a communication band D on the right side of the drawing.
It enters the passband Z _D drawing from the center _E, shows the line connection control when without vacant communication channel in the passband will move to the passband Z _C remains left side of the drawing connection line is suspended . In this case, the mobile station 6 which was in a passband Z _E has reached the overlap zone Z _DE between passband Z _E moves the passband Z _D is the same as in the case of FIG. 1, the radio from the mobile station 6 The identification can be made by analyzing the mobile information signal sent to the base control station 4.

When the mobile station control station 4 identifies that the mobile station 6 has reached the overlapping area Z _DE of the communication band Z _E and the communication band Z _D , the radio base station D becomes free for the radio base station D in the communication band Z _D. A reservation command signal for the communication channel is transmitted. Upon receiving the command signal, the wireless base station D immediately searches for a free communication channel of its own, and if there is no free communication channel, transmits a report signal indicating “no free communication channel” to the wireless base station control station 4. I do. This report signal is transferred to the radio base station E and the exchange 2 via the radio base control station 4, and based on the report signal, both the callers are notified of the line interruption by voice.

When one or both of the callers desire to continue the call, the radio base station 4 sends a radio channel monitoring command signal to the radio base station D. The radio base station D that has received the command signal is to start monitoring the local station communication channel, through the central region of the left passband Z _D of the mobile station 6 is pending before the vacant communication channel is generated It is assumed that the movement has been made to the overlapping area Z _CD with the speech band Z _C.

When the base station control station 4 identifies that the mobile station 6 has entered the overlapping area Z _{CD while} being in the hold state, the next adjacent speech band in the traveling direction of the mobile station (ie, the speech band Z _C ). Is determined, and a reservation command signal for an idle communication channel is transmitted to the wireless base station C in the adjacent band. As a result, the radio base station C takes over the operation of the radio base station D and starts searching for its own communication channel. If there is an available channel, the radio base station C captures the channel and reserves it for the mobile station 6. I do. The wireless base control station 4, upon identifying that the mobile station 6 enters to passband Z _C beyond the overlapping region Z _CD, sending a connection command signal communication line to the radio base station C. The radio base station C that has received the command signal allocates a reserved communication channel to the mobile station 6 and executes necessary line connection control. On the other hand, as a result of the search for an empty communication channel by the radio base station C, if all the communication channels are reserved or in use and there is no available communication, the radio base station C sends a “No available communication channel” to the radio base control station 4. Send a notification signal. Subsequent line connection control is exactly the same as in FIG. In order to prevent unnecessary reservation, when the mobile station 6 enters to overlap region Z _CD it is desirably configured to stop the channel reservation in passband Z _D.

[0028]

According to the present invention, since it is possible to reserve a free communication channel only for the communication band in the traveling direction of the mobile station and execute the line connection, an adjacent communication band other than the communication band in the traveling direction can be reserved. Available communication channels can be effectively used for other mobile stations. In addition, when there is no available communication channel in the communication band in the mobile station traveling direction, both the callers can be notified of the line cutoff, so that undesired call forcible cutoff can be prevented, Since the caller can wait until a vacant call channel is generated in the call band in the traveling direction and control the line connection after waiting for the vacant call channel, the service for the customer is further improved. effective.

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment of a reservation connection method according to the present invention.

FIG. 2 is a system diagram for explaining a different processing operation of the embodiment of FIG. 1;

FIG. 3 is a system diagram for explaining still another processing operation of the embodiment of FIG. 1;

FIG. 4 is a system diagram showing an example of a mobile station used in an embodiment of the present invention.

FIG. 5 is a first partial view of a flowchart for explaining the operation of the embodiment in FIG. 1;

FIG. 6 is a second partial view of the flowchart.

FIG. 7 is a third partial view of the flowchart.

FIG. 8 is a fourth partial view of the flowchart.

[Explanation of symbols]

1 ... subscriber telephone equipment 2 ... exchange office 3 ...
Central control device, 4: Radio base control station, 5: Central control device, 6: Mobile station, A to G: Radio base station, 40: Antenna device, 41: Radio transmission / reception device, 42: Voice call signal control device, 43 …
Mobile station telephone device, 44: transmitter, 45: receiver, 46: central control device, 47: voice guidance signal generator, 48: mobile information processing device, 49
... Moving information detection device.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04B 7/26 H04Q ⁷ /00-7/38

Claims (6)

(57) [Claims] An integrated control of a plurality of radio base stations having a plurality of communication channels, one or more mobile stations for performing radio communication between these radio base stations, and a radio base station In a mobile communication network comprising a radio base control station for performing a line connection by allocating a predetermined communication channel to a mobile station in response to a call,
The mobile station has at least means for transmitting a mobile information signal indicating the position and traveling direction of the mobile station to the radio base station. Is determined, the adjacent communication band in the traveling direction of the mobile station is determined based on the mobile information signal transmitted from the mobile station, and the radio base station of the adjacent band is determined. The wireless base station is configured to transmit an idle communication channel reservation signal to the base station, and the wireless base station searches for an idle communication channel of its own station based on the reservation instruction signal sent from the wireless base station control station. When a mobile station in a talk or hold state enters the talk band of the own station from the talk band of another station, the reserved talk channel is assigned to the mobile station and the necessary line connection is made. Adjacent passband reservation connection method, characterized in that it is configured to perform control. 2. The transmission of a reservation command signal by the radio base station is performed when a mobile station in a talking state or a holding state in one communication band reaches an overlapping area with an adjacent communication band in the traveling direction. 2. The adjoining speech band reservation connection method according to claim 1, wherein: 3. The radio base station control station, if there is no free call channel in the adjacent call band in the traveling direction of the mobile station, before the mobile station in the call state or the hold state enters the adjacent band, gives a call to both parties. 3. The adjacent call band reservation connection system according to claim 1, wherein the system is configured to give a notice of line cutoff. 4. A radio base station, when a mobile station in a talk state or a hold state enters a talk band of its own station having no free talk channel, suspends a line connection to the mobile station and waits for a subsequent recall. 4. The adjoining speech band reservation connection method according to claim 3, wherein necessary line connection control is performed again. 5. A radio base station, when a mobile station in a talk state or a hold state enters a talk band of its own station having no free talk channel, suspends a line connection to the mobile station and changes its talk channel. 4. The adjoining call band reservation connection method according to claim 3, wherein the adjoining call band reservation connection system is configured to monitor and perform necessary line connection control in response to occurrence of an idle call channel. 6. The line connection control by the radio base station,
6. The adjoining bandwidth reservation connection method according to claim 5, wherein the method is configured to be performed when a request is received from one or a direction of a caller.