JPH01311636A - Communication system in mobile body communication system - Google Patents

Abstract

PURPOSE:To make a frequency switching operation classified by every zone at a mobile station by using the same frequency repeatedly effectively and to reduce a load on a processing by employing an intermittent minimum zone system. CONSTITUTION:An area whose service area i.e. the size of the zone 20 is remarkably small compared with the arranging interval of a road station 10 and in which no mobile station loaded on a subscriber vehicle 12 reacts according to a radio wave 18 transmitted from the road station 10 actually i.e. no radio area exists. Therefore, in such intermittent minimum zone system, the same frequency can be used effectively repeatedly on an adjacent road station 20. In such a way, it is possible to make the switching control of the frequency at every zone unnecessary by the mobile station, and to reduce the load on the processing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mobile communication system, and more specifically, to a communication method in a mobile communication system suitable for communication with a vehicle such as an automobile.

(Prior Art) As a conventional mobile communication system to which the present invention is particularly related, there is a car telephone system, for example.As is well known, a conventional car phone system has two base stations covering a predetermined service zone. Some base stations employ a cellular system in which the zones of adjacent base stations partially overlap to ensure continuity of communication to mobile units.

(Problems to be Solved by the Invention) In the cellular system, different fx? t frequency is used. To effectively utilize the limited frequency band,
Subdivide the zone configuration and return the same frequency to the pupil 1. use. In this case, if radio waves of the same frequency are used in close proximity,
Because radio waves interfere with each other, the same frequency is used in zones that are a certain distance apart. Therefore, as a mobile object moves, it passes through zones with different frequencies, and in order to be able to make calls no matter which zone it travels to, it is necessary to have a mobile station installed on the mobile object have multiple wireless channels. In this way, by subdividing the zone structure and increasing the number of times a single frequency can be used independently within an area, the number of times a frequency can be used independently as a person moves across zones increases. The frequency of frequency switching control increases12, creating a burden on both the base station and mobile station for frequency switching control. Furthermore, this tendency becomes more pronounced as the moving speed of the mobile object increases, and the processing load on the base station and mobile station increases.

Also, in mobile communications, mobile stations are not fixed and are always connected!
! lj around. Therefore, a plurality of radio wave propagation paths exist between the base station and the mobile station, and as a result of these interfering with each other, a rapid and significant change in the amount of radio wave attenuation occurs as the mobile station moves. Therefore, in areas where there is no line of sight, sufficient radio waves cannot be supplied to the mobile station, and a bus between the ground station and the mobile station may not be set up even if the connection route to the general telephone network is established. In this case, the caller is forced to wait until the bus with the mobile station is established.
Also, the bus between the calling terminal and the ground station is held invalid during that time. Furthermore, if a bus connection with the mobile station cannot be established for a predetermined period of time or longer, the caller is notified, for example, by voice guidance from the general telephone network that the connection cannot be established. In this case, the caller had to call the mobile station several times to communicate the business until a connection was established.

It is an object of the present invention to provide a communication method in a mobile communication system that can eliminate the drawbacks of the conventional technology, reduce the processing load on ground stations and mobile stations, and make effective use of the communication network. .

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a plurality of base stations each communicating with a mobile station via a wireless link, and a plurality of base stations accommodating the plurality of base stations. and a plurality of switching stations forming a communication line network for exchanging communications with the base stations, and adjacent ones of the plurality of base stations have an area interposed between them in which the mobile station does not substantially respond to the radio waves of the wireless link. When the communication line network receives information to be transmitted to a mobile station, it temporarily stores the information, restores the connection with the source of the information, and transmits the information to one of the base stations. When the communication network receives information from the mobile station via the base station, it temporarily stores the information and sends it to the destination.

(Function) According to the present invention, when the communication line network receives information to be transmitted to a mobile station, it temporarily stores this information and restores the connection with the source of this information. The communication network then transmits this information to one of the base stations, and then to the destination mobile station.

Furthermore, when the communication network receives information from the mobile station via the base station, it temporarily stores this information and sends it to the destination.

(Example) Next, an example of a communication method in a mobile communication system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows an embodiment in which the mobile communication system according to the present invention is applied to land transportation, particularly road traffic for vehicles including automobiles, as a road-to-vehicle individual communication system. A plurality of road stations 1O are arranged at predetermined intervals, for example, at intervals of several hundred meters to several kilometers, along roads and expressways. This interval may be set to an appropriate value depending on, for example, the vehicle speed allowed on the road. The roadside station 10 is a ground station that functions as a base station that communicates wirelessly with the subscriber vehicle 12 on the road. .

The roadside station 10 has a transceiver 14, which is connected to the participating vehicle 1.
Mobile station 16 mounted on 2, that is, an on-vehicle device (not shown)
A vehicle 12 that transmits and receives radio waves per day between
One of the characteristics of this embodiment is that the roadside station 10 is
The size of the zone 20 is much smaller than the interval, and the roadside stations IO are arranged intermittently. The diameter may be, for example, on the order of several tens of meters to 100 meters. Therefore, between two adjacent zones 20, there is an area where the mobile station 1B does not substantially respond to the radio waves transmitted by the roadside station 1O, that is, a "no radio wave" zone. "Compensation ball" exists and the vehicle I2 is allowed to enter the road station lO only while it is included in the zone 20.
You can communicate with. This communication takes place at high speed.

As you will see from now on, in the 1st son ceremony, the adjacent street station 2
The same frequency can be effectively used repeatedly for 0 as well. Therefore, basically, the road station 10 and the mobile station 16
It is sufficient to use a single frequency for the entire system for the radio link between In the case of a system that enables full-duplex communication, a pair of different frequencies are used for upper and lower frequencies.

As a result, it is not necessary to switch frequency zones as in the conventional cellular system, so that the processing load on the mobile station 16 can be significantly reduced. Because of these characteristics, the wooden sword method is called the "intermittent minimal zone method", and zone 20 is called the "intermittent minimal zone method".
It is called the "minimum zone".

The roadside station IO constitutes a part of the road-to-vehicle individual communication line network 22, and in this embodiment, a general telephone line network 24, a data exchange network 25, a system center 26, a user center 28, etc. are connected via the line network 22. Other communication facilities can be accessed. In this embodiment, the road-to-vehicle individual communication line network 22 has a station hierarchy configuration as illustrated in FIG. It is a communication line network that conducts communications.

This will be explained in detail later.

In such an intermittent minimum zone method, it is possible to increase the speed of communication between the mobile station 16 and the roadside station 1O, and a variety of services including high-speed data communication can be provided. For example, the road-to-vehicle individual communication network 22 is used for navigation purposes that guide member vehicles 20 such as cars to appropriate routes depending on road congestion and weather conditions, and for the purpose of efficiently managing the operation of a large number of vehicles 20. Non-conversational voice and data communications may be made between centers 28 and 28 and mobile station 16 via the center.

Referring to FIG. 1, the road-to-vehicle individual communication network 22 in this embodiment includes a district station 30 that accommodates a plurality of roadside stations 10 arranged in a certain district, and a plurality of district stations 30 in this embodiment. It has a hierarchical structure consisting of a regional station 32 that accommodates a certain region, and a general station 34 that accommodates several of these regional stations 32.

These switching stations 30, 32, and 34 including the roadside station 10 are referred to as ground stations. District bureau 30, regional bureau 32 and general bureau 3
In this embodiment, the lines between the four lines form a tree-like line network consisting of trunk lines and trunk lines 3B such as diagonal lines.
The communication between the general stations 34 constitutes a set line network.The present invention is not limited to this network type, but may be configured, for example, by a station hierarchy configuration according to the type of road such as a general road or an expressway. Other aspects such as a linear mesh may also be used.
Needless to say.

A trunk line 38 for the general telephone line network 24 and the data exchange network 25 is connected to a central office 34, for example. The telephone line network 24 is a telephone switching network that mainly exchanges and controls voice, and the data switching network 25 is a packet switching network that mainly exchanges and controls data. The telephone line network 24 is particularly compatible with packet switching networks because it transmits digital signals in the form of packets or the like.
For example, a communication terminal 3 such as a telephone that transmits and receives audio signals or an information device that exchanges data is housed therein. In the figure, only one terminal 3 is accommodated in the five-line network 24, but in reality, a plurality of terminals are accommodated therein.

The system center 26 is, for example, an information processing system that processes navigation for the participating vehicle 12. Further, the user center 28 is an information processing system that independently manages the operation of the subscribed vehicles 12 belonging to a specific user. Of course, these are inter-regional 11 and district stations 12.
may be connected to.

The general office 34, interregional office 11, and district office 12 each have a unique office code. Among them, by representing the codes of the general station 34 and the inter-regional 11 in a station hierarchy structure, the registered ground station code 52 (third
) is formed. Mobile station 1 mounted on subscriber vehicle 12
6 is registered in the central office 34 in a large company that owns a large number of participating vehicles nationwide, as in this embodiment, and the central office 34 uses a unique mobile station code 5.
4 is given.

Therefore, nationwide, the on-vehicle device or mobile station 16 is identified by the ground station code 52 and the mobile station code 54. Note that the participating vehicle 12 may be registered with the inter-region 32 or the district office 30.

The vehicle-specific code for identifying the mobile station 16 is composed of a static code 50 and a dynamic code 60 in this embodiment, as shown in FIG. The static code 50 is a code that identifies the mobile station 1B registered in the central office 34, and includes a ground station code 52, a mobile station code 54, and a system code 5B for identifying this system. The system code 56 is a code that specifies this system to distinguish it from other systems, and may be omitted inside this system.Therefore, the static code 50 is a code for identifying each mobile station 16 within the system. In addition to functioning as a number, it is also a regular telephone line! P24, data exchange network 25 or center 2
There is a close relationship with the numbering system for incoming calls to the mobile station 16 from the 6.2nd.

The mobile station 16 of the participating vehicle 12 has a vehicle code generator (not shown), which is a functional unit that generates a vehicle code assigned to the mobile station 16. This vehicle code includes a ground station code 52 that specifies the registration station to which the mobile station 16 is originally registered, and a mobile station code 54 of the mobile station 16. These codes are set in the vehicle code generator, and are read out and transmitted in response to polling from the roadside station 10, which will be described later.

For example, the mobile station 16 is registered in the general office AO shown in FIG. The ground station code 52 of this mobile station 16 is, for example, r
AOJIJ, mobile station 1 in its general office
If the mobile station code 54 of No. 8 is rMO3J, the mobile station 16 is identified by the static vehicle code rAOJIMO3J.

The dynamic code 60 is a code corresponding to the movement state of the participating vehicle 12, and is effectively used to grasp the current situation of the participating vehicle 12 and navigate. Therefore, it is a vehicle-specific code related to the driving area and movement status of the subscriber vehicle 12, and is a code unique to the general telephone line network 24, data exchange network 25,
It plays an important role in searching the vehicle location for individual communication from the center 26, 28, providing route guidance information to the travel destination of the subscriber vehicle 12, etc. Therefore, in this embodiment, the operation of the subscriber vehicle 12 is The driving area code 64 includes a destination code 62 indicating the destination and a driving area code 64 indicating the current driving area. Ru. In addition to this, a link code that specifies the set communication link may also be included.

The general office 34 updates the dynamic data of registered participating vehicles, and updates the road-to-vehicle individual communication network 22. An information processing unit that stores and processes information sent from the system center 2G and user center 28) (IPU) 20, and a packet switching unit that performs connection processing for the trunk line 36) (P
SU) has 21. When the information processing unit 20 receives message information addressed to the subscriber vehicle 12 from the communication terminal 3, for example, it verifies whether the mobile station code of the subscriber vehicle 12 is registered. When the mobile station code of the joining vehicle 12 is registered in this information processing unit 20, the mobile station code 54 of the joining vehicle 12 is registered in the unit 20.
and the information contents of the individual communication are temporarily stored. Then, the information processing unit 20 adds the latest driving area code 64 to the stored message information and transmits it from the exchange unit 21. Furthermore, after storing the message information, the information processing unit 20 instructs the exchange unit 21 to perform recovery processing with the communication terminal 3. With this instruction, the communication terminal 3 can immediately release the line after transmitting the message information. It should be noted that, as in this embodiment, all the seven users of the participating vehicles 12 registered in the central office 34 may search for the driving area using the AVM (automobile vehicle monitor) system of the user center. Of course, the search by the AVM system can also be performed in the same way, for example, in the participating vehicle 12 registered with the base station 32. Furthermore, if the vehicle is not found as a result of the verification, the general office 34 simultaneously starts verification with other stations.

In this embodiment, a traveling vehicle table is prepared in the information processing unit 20 of the general office 34. The running vehicle table stores data indicating the current running areas of the 11 vehicles 12 belonging to the local station that are registered as belonging to the general station 34, by station area, and also stores the data showing the current running areas of the 11 vehicles 12 registered as belonging to the general station 34. Data on participating vehicles 12 traveling in the area is stored for each registration station. These data in the running vehicle table are constantly updated. Similar vehicle tables may also be provided at district stations 30 and base stations 32, for example.

The district station 30 is a station that broadcasts the message information received from the base station 32 to all the road stations 10 accommodated by the district station 30 via the trunk line 3B. This is because when the district station 30 receives message information from the base station 32, the area of this district station 30 includes the mobile station that transmits the message information. When the roadside station 1° that has received the message information receives the static code 50 from the mobile station 16, the mobile station 16 currently passing through transmits the message information using the mobile station code 54 included in this code 50. Determine whether the mobile station is 6 or not. Street station 10.

When the code 54 of the mobile station 16 determines that the mobile station is the one to which the message information is to be transmitted, the message information is transmitted to this mobile station.

As conceptually shown in FIG.
is arranged, which is used for the passing vehicle table and the mobile station 16.
The zero-passing vehicle table, which includes a storage area in which information to be transmitted and received from the roadside station is stored, holds data regarding participating vehicles 12 that pass through the minimal zone 20 of the roadside station 1°. These data include vehicle specific codes 50 and 80;
It is constantly updated as the joining vehicle 12 passes.

In this embodiment, the mobile station 16 is a member vehicle 12 such as a car.
This is an in-vehicle device that is mounted on a vehicle and transmits and receives data such as navigation information and operation management information, messages, and image signals to and from the roadside station 10, and displays these signals visually and/or audibly to passengers. Preferably, the vehicle is equipped with a video display, a facsimile transmitting/receiving device, a voice synthesizing device, etc., which provide an image and audio interface to the passenger. The mobile station 16 may also have an automatic operation system for the control mechanism of the participating vehicle 12.
A random number table Fa is provided, and according to this it responds to polling from the road station IO. The roadside station 10 selects an available free channel from among a plurality of channels on the link 18 with the mobile station 18.

Communication between the mobile station 16 of the subscribing vehicle 12 and the base station 1o is carried out by polling using a frame 100 having a format as illustrated in FIG. is 683 milliseconds (11g)
, the transmission rate is 512 t/sec, and a plurality of channels are multiplexed into a large number of time slows 21 included therein. In principle, the required bidirectional communication is completed within this one frame period. A single frequency is used for wireless link 18. In the case of full-duplex communication, a pair of different frequencies are used for upper and lower frequencies. However, these frequencies may be fixed, and the same frequencies are used no matter which roadside station 10's zone 20 the subscribing vehicle 12 moves to.

An introduction section 102 is located at the beginning of the frame 100, and includes a preamble, a synchronization signal, a polling identification signal, a road station IO code, and the like.

Using this, the roadside station 10 polls the mobile station 1B within the zone 20 at a predetermined period, as shown in FIG. The mobile station IS is in the receiving mode in the idle state, and the introduction part 1
When the reception of 02 is completed, it enters the transmission mode.

The introduction section 102 is followed by a vehicle recognition section 104, which includes:
Mobile station 16 responds to polling with vehicle specific code 50.
and 80 are transmitted, and the roadside station 10 recognizes this. Advantageously, by performing two-block repeated transmissions, the recognition rate of participating vehicles 12 is significantly improved. In response to polling, the mobile station 18 selects an available free channel from among a plurality of channels by the road station 10. This channel is used to transmit static vehicle-specific codes 50 and service function codes to the roadside station IO (see FIG. 5).

FIG. 5 shows an embodiment of the vehicle call reception processing sequence. Using the same figure and FIG. 1, from the communication terminal 3
The information message sent from the communication terminal 3 explaining the incoming call processing sequence to the mobile station 16 having the static vehicle code of OJIMO3J is sent via the general telephone line 24 to the static vehicle-specific code including the destination code rAOJIMO3J. The road-to-vehicle communication network 2 with a header in the form of 50
When the code is sent to the information processing unit 20, it is sent to the information processing unit 20 via the exchange 21 of the general office AO, which is the registration station for the vehicle-specific code 50. When the information processing unit 20 receives this message, it checks the registration qualification of the mobile station AOJIMO 3 to receive the call from the communication terminal 3 based on the destination code, and if it satisfies this, it temporarily stores the message (350). When the information processing unit 20 has accumulated the messages, it instructs the exchange unit 21 to restore the line. This allows the communication terminal 3 to quickly end communication after transmitting the message.

The information processing unit 20 refers to the traveling vehicle table,
The current location of the receiving mobile station AOJIMO3 is determined from the mobile station location data. As a result, mobile station AOJIMO3
If the current location of is found to be, for example, rAOBlcIJ, then the processing unit 20 creates a dynamic vehicle-specific code 60 containing the address rAOB1cIJ of the district office 30 as the driving area code 64. The unit 20 then reads the stored message, adds the dynamic code 60 to its header, and sends it to the exchange processing unit 21. The exchange processing unit 21 selects the trunk line 36 connected to the inter-area AOBI using the dynamic code 60, and transmits the information.

Relay stations such as the central station 34 and the interregional station 32 identify the dynamic vehicle-specific code 60 added to the message and forward it to the destination station AOBICI. District station AOB
When the ICI receives this message along with the header, it broadcasts it to all the over-the-air stations IO accommodated therein.

This circular includes a delivery request, a message, and the message's destination code "AOJIM03." Each road station 1O temporarily stores the received message in the memory 42. The roadside station 10 polls mobile stations 18 included within its service zone 20 . This polling is performed independently (asynchronously) of the arrival of the message, and is performed at the introduction section 102 of the frame 100 as described above.

Active mobile stations 16 included within the service zone 20 of the road station 10 respond to this polling by generating vehicle codes 50 and 60 in their vehicle code generators and transmitting them back to the road station 10. The vehicle recognition unit 104 is used for this. The roadside station IO temporarily stores the vehicle code returned from the mobile station 16 in the passing vehicle table, and compares the mobile station code 54 of the static vehicle-specific code 50 with the destination code rAIJIMO3J of the message (354).
, when the two match at one of the roadside stations 10, that station 10 reads the transmitted message from the memory 42 and transmits it on the channel of the mobile station AIJIMO3 using the vehicle communication section 108. Mobile station AI that received the message
JIMO3 uses the communication completion unit 110 to send back a reception confirmation response, which is ultimately transferred to the general office AO, which is the registration station, via the ground station. When the information processing unit 20 of the general office AO receives the reception confirmation response signal from the mobile station AOJ 1MO3, it notifies the communication terminal 3 that the message has arrived at the mobile station AOJIMO3, as necessary.

The remaining roadside stations 10 whose vehicle codes do not match in step 354 discard the messages stored in the memory 42 in response to, for example, a cancellation request signal from the district station 30, and end this process (35B).

It should be noted that each station returns an acknowledgment response at each stage of this mobile station incoming sequence, but this is not shown in FIG. 5 to avoid complication of the diagram.

FIG. 6 shows a processing sequence for transmitting a message from mobile station AOJ 1MO3. Same figure and 1st
The vehicle transmission processing sequence from the vehicle code rAOJIMO3J will be explained using the diagram. When the mobile station 16 with the vehicle code rAOJ1A03J enters the zone 20 of the roadside station AOBICI[]5, it is polled by the roadside station AOBICID5 at a predetermined period. As described above, this mobile station 1B is in the reception mode in the idle state, and the introduction section 102
When it finishes receiving, it goes into transmit mode. That is, when the mobile station 16 receives polling, it selects one channel from a plurality of channels from a random number table in response to the polling and transmits it to the road station IO. The roadside station 10 uses this selected channel if it does not overlap with any other mobile station 16 . When a communication channel is specified by the roadside station IO, the mobile station 16 sends a static vehicle code 50 or a dynamic vehicle code 60 from the vehicle recognition unit 104, and also sends message information from the vehicle communication unit 108 to the destination code of the destination. It is also sent to the road station AOBIGID5.

When the roadside station AOBICID5 receives the vehicle code rAOJIMO3j registered in the mobile station code 54 of the mobile station 16, it temporarily stores this message information and the destination code in the memory 42, and transmits it together with the vehicle code 50 to the upper district station AOBICI. Transfer to. Top district station A
The OBICI identifies its registration station from the vehicle code rAOJ111103J, and transmits its own location information, message information, and destination code to the general office AO, which is the registration station of the mobile station 16. When the information processing processor 20 of the general office AO receives the static vehicle code 50 and the dynamic vehicle code 60, it checks the registration qualification of the mobile station AOJIMO3, and if the registration qualification is satisfied, the mobile station code 54 determines the target vehicle. The mobile station 16, ie, MO3 in this example, is identified and the location data of its corresponding storage location is stored. Further, the information processing processor 20 creates an address of a communication terminal in the telephone network 24 from the received destination code, and adds this address to the message. The message information to which the address has been added is sent from the exchange processing processor 21 via the general telephone line network 24 to the communication terminal 3 indicated by this address. Note that even when the mobile station 16 sends a message, each station returns an acknowledgment at each stage of the mobile station sending sequence, but this is done in the same manner as in Fig. 5 to avoid complication of the diagram. Not shown in Figure 6.

As described above, according to this embodiment, since communication is performed using a single frequency, the mobile station 16 does not need to perform frequency switching control for each zone, and the processing load can be reduced. Further, the road-to-vehicle individual communication line network 22 stores messages sent from the communication terminals 3 accommodated in the general telephone line network 24, etc. within the network, and then transfers them to the telephone line network 24.
After the connection with the mobile station 4 is restored, the accumulated message information is transferred to the mobile station 16. Therefore, the communication terminal 3
The call is not put on hold until a path with B is established, and the hold time of the telephone line network can be shortened.

An embodiment in which the present invention is applied to a road-to-vehicle individual communication system has been described. However, the present invention is not limited thereto, and can be effectively applied to individual communication with any moving object other than a vehicle, such as an individual, ie, a pedestrian in a broad sense.

Note that the embodiments described here are for explaining the present invention, and the present invention is not necessarily limited thereto, and modifications and variations that can be made by those skilled in the art without departing from the spirit of the present invention. Modifications are within the scope of this invention.

(Effects of the Invention) The mobile communication system according to the present invention employs the intermittent minimal zone method as described above. This allows the same frequency to be used repeatedly. Therefore, the mobile station does not need to perform a frequency switching operation for each zone, and the processing load can be reduced. In addition, when a mobile communication system receives information within this network, it temporarily stores this information and restores the connection with the destination, so each resource is not put on hold until the connection with the mobile station is completed. It can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram showing an example of the station hierarchy structure of the communication method in the mobile communication system of the present invention. FIG. A conceptual block diagram showing the applied embodiment as a road-to-vehicle individual communication system, Figure 3 is an explanatory diagram showing an example of the format of the vehicle-specific code in the embodiment, and Figure 4 shows the frame format in the embodiment. An explanatory diagram showing an example; FIG. 5 is a sequence diagram showing an example of the incoming call processing sequence to a mobile station in the same embodiment; FIG. 6 is a sequence diagram showing an example of the outgoing call processing sequence from the mobile station in the same embodiment. It is a diagram. Explanation of the symbols of important parts 3, Communication terminal io, Roadside station 12, Participating vehicle 14, Transmitter/receiver 20, Minimum zone 22, Road-to-vehicle individual communication Line network 24...
General telephone line network 30, 32, 34, switching center, ground station 42, , memory 80, , traveling vehicle table 82, , passing vehicle table 130, , vehicle code generator 132, , , Patent applicant for the station code generation section Oki Electric Industry Co., Ltd. Agent Number: Takao Kazan Takao F 11 code 7 ohm/)G Figure 3 9 Figure ≠Figure

Claims (1)

[Claims] A plurality of base stations each communicating with a mobile station via a wireless link, and a plurality of base stations forming a communication line network accommodating the plurality of base stations and exchanging communications for the plurality of base stations. a switching center, adjacent ones of the plurality of base stations are spaced apart from each other with an area interposed therebetween in which the mobile station does not substantially respond to radio waves of the wireless link, and the communication line When the network receives the information to be transmitted to the mobile station, the network temporarily stores the information, restores the connection with the source of the information, and transmits the information to one of the base stations; A communication system in a mobile communication system characterized in that when information is received from the mobile station via the base station, the information is temporarily stored and sent to a destination.