JP2003224882A - Cdma mobile communication system and recording medium thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a CDMA mobile communication system adopting the cdmaOne/IMT2000 (W-CDMA) system and recording medium thereof capable of attaining adjacent station connection control in a call station busy state ((1) MS call processing in a BTS busy, (2) adjacent station information update processing in the MS, (3) BTS busy control between BSC and MS). <P>SOLUTION: When the MS detects a BTS busy state of its own station in a calling state, the MS searches a vicinity BTS from an internal neighbor list and uses the BTS to make a call (1). The MS receives the neighbor list having the information of the BTS containing the MS and its vicinity BTS in the case of position registration/parameter update/hand-off and updates the internal neighbor list on the basis of the neighbor list (2). A BSC informs the MS about the busy state/busy release of the BTS and the MS uses the BTS except the busy BTS to perform a call processing and hand-off processing on the basis of the BTS busy information received from the BSC (3). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to cdmaOne.
(Trademark registration) / IMT2000 (International M-obil
e Telecommunications 2000) related to a control method of a communication channel (resource) in a mobile communication system, particularly, in a mobile terminal (MS) call processing and a mobile terminal (MS) when a base station wireless device (BTS) is busy. The present invention relates to a CDMA mobile communication system capable of performing adjacent station information update processing and BTS busy control between a base station controller (BSC) and a mobile terminal (MS).

In recent years, the number of subscribers in mobile communication services has increased remarkably, and the traffic volume of mobile communication systems has also increased in proportion thereto. Under these circumstances, a more flexible resource control technique for mobile communication systems is needed to provide communication services more comfortably. The cdmaOne and IMT20
00 is both CDMA (Code Divi-sion Multiple Acce
ss: Code Division Multiple Access mobile communication system, in particular, IMT2000 is a W-CDMA (W-ideband-Code Division) defined by ITU (International Telecommunication Union).
Multiple Access: Wideband code division multiple access).

[0003]

2. Description of the Related Art FIG. 16 is a block diagram of a general CDMA mobile communication system. In FIG. 16, 1 is a mobile terminal (MS: Mobile Station), 2 is a base station wireless device (BT)
S: Base Transceiver Station), 3 a base station controller (BSC: Base Station Controller), 4 a network monitoring device (NMC: Network Management Center),
6 is a mobile switching center (MSC: Mobile Switching Center).

CdmaOne / IMT2000 (W-C
In a CDMA mobile communication system adopting the (DMA) system, a plurality of BTS2 ₁ , BTS2 ₂ are subordinate to BSC3.
Is placed to prevent the occurrence of dead zones. Also,
Each of the BTSs 2 ₁ and BTS _{2 2} also has a plurality of call channels (resources) so that a plurality of MSs ₁ can simultaneously make calls within the call area.

The BSC3 / BTS2 allocates one speech channel (resource) in the BTS2 each time a call from the MS1 occurs. When all the communication channels (resources) of BTS2 are captured and there is no free space, that BTS
When an outgoing call occurs in the service area covered by No. 2, the BSC3 abandons the outgoing call as BTS2 busy. Also, in the case of the MS 1, if the location-registered BTS 2 cannot make a call, it waits until the resource of the BTS 2 becomes available.

[0006]

The conventional CDMA mobile communication system has the following problems. First,
Since the conventional mobile terminal (MS) cannot recognize whether the first candidate base station wireless device (BTS) receiving the pilot signal is congested, resources of other base station wireless devices (BTS) are not recognized. Even if it is free, a call is made to the base station wireless device (BTS) receiving the pilot. As a result, the call connection fails.

Second, conventional base station radio equipment (BTS)
Since the load is not distributed according to the resource status of
Calls concentrate on a specific base station wireless device (BTS), which causes call connection failure and deterioration of serviceability. In addition, since the base station wireless device (BTS) used for a call cannot be selected due to the availability of the resource of the base station wireless device (BTS), the resource cannot be effectively used.

Third, specific base station radio equipment (BTS)
If there is a sudden increase in traffic volume during a specific time zone, or if there is another connectable base station wireless device (BTS), the call is not switched to that base station wireless device (BTS). This leads to inability to connect and deterioration of serviceability. The present invention has been made to solve the above problems, and enables improvement of the call connection rate at the time of congestion of a base station wireless device (BTS) and load distribution of call processing for a sudden increase in traffic. It is an object of the present invention to provide a CDMA mobile communication system and its recording medium.

[0009]

A first invention for solving the above-mentioned problems is to provide a plurality of base station radio devices under the control of a base station control device, and to provide a service area covered by each base station radio device. In the mobile communication system, which comprises a plurality of call channels that enable calls from a plurality of mobile terminals at the same time, and assigns one call channel in the base station wireless device each time a call from the mobile terminals occurs, When a call response is not returned in response to a call request from the mobile terminal to the first candidate base station wireless device, the mobile terminal is the next candidate base station radio that is an adjacent station triggered by a call response waiting timeout. It is provided with means for determining a device and means for transmitting a call request to the determined next candidate base station wireless device.

According to the first invention, the mobile terminal (M
Even when the nearest base station wireless device (BTS) receiving the pilot signal cannot accept the call when the call is made from S) on the neighbor list (adjacent station information list) Can establish a communication path with the second candidate base station wireless device (BTS).

A second aspect of the present invention arranges a plurality of base station radio devices under the control of the base station control device and enables simultaneous transmission from a plurality of mobile terminals within a service area covered by each base station radio device. In a mobile communication system comprising a plurality of call channels and allocating one call channel in the base station radio device every time a call is originated from the mobile terminal, the base station controller which is a base station side device, and the The base station wireless device is means for notifying the mobile terminal of the neighbor station information list upon location registration, handoff, or system parameter update, and neighbor station information held in the mobile terminal. Means for updating the list to the latest information.

According to the second invention, the mobile terminal (M
S) manages the base station wireless device (BTS) near the communication area to which the mobile terminal (MS) belongs on the neighbor list (adjacent station information list), and the base station controller (BSC).
The latest neighbor list (adjacent station information list) can always be managed by the neighbor list (adjacent station information list) update message received from.

According to a third aspect of the present invention, a plurality of base station radio devices are arranged under the control of a base station control device to enable simultaneous transmission from a plurality of mobile terminals within a service area covered by each base station radio device. In a mobile communication system comprising a plurality of call channels and assigning one call channel in the base station radio device every time a call is originated from the mobile terminal, the base station radio subordinate to the base station control device A means for detecting a busy occurrence or a busy release of the device, a means for notifying the location registered mobile terminal of the busy occurrence or the busy release of the base station wireless device, the mobile terminal of the base station wireless device When a notification of busy occurrence or busy cancellation is received, if the notified base station wireless device is in the neighboring station information list, the status of the base station wireless device is changed to busy or Means for transitioning to the no longer busy state,
And a means for issuing a call request while avoiding the base station wireless device in a busy state at the time of outgoing after the transition.

According to the third aspect of the present invention, it is possible to establish the control of the base station radio unit (BTS) busy between the base station controller (BSC) and the mobile terminal (MS). The fourth invention is
A plurality of base station radio devices are arranged under the control of a base station control device, and a plurality of communication channels are provided to enable transmission from a plurality of mobile terminals at the same time within a service area covered by each base station radio device, In the mobile communication system in which one communication channel is assigned to the base station wireless device each time a call is generated from a mobile terminal, the network monitoring device uses the statistical information to determine the base station wireless device and time zone in which traffic is concentrated. And means for requesting the base station wireless device to transmit the base station wireless device busy notification to the mobile terminal during the time period.

According to the fourth aspect of the invention, the load concentrated on the base station radio equipment (BTS) can be dispersed based on the statistical information. A fifth aspect of the present invention includes a step of discarding a call request when a call from a mobile terminal is available on a base station side when there is no free space for a normal call radio channel of a base station wireless device, and a call for the call request. Selecting a next candidate base station wireless device from the adjacent station information list triggered by a response waiting timeout; retransmitting a call request to the selected next candidate base station wireless device; and the base station wireless device The mobile terminal stores a program for executing a step of establishing a communication path with the base station wireless device after receiving a call response from the mobile station.

According to the fifth aspect of the invention, the mobile terminal (M
Even when the nearest base station wireless device (BTS) receiving the pilot signal cannot accept the call when the call is made from S) on the neighbor list (adjacent station information list) Can provide a control method for establishing a communication path with the second candidate base station wireless device (BTS).

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In addition, in order to facilitate understanding through all the drawings, the same portions are denoted by the same reference numerals. FIG. 1 is a configuration diagram of a CDMA mobile communication system according to an embodiment of the present invention, which will be described below as a common configuration block diagram for explaining the present invention.

In FIG. 1, 1 is a mobile terminal (MS: Mobi
le Station), 2 is a base station wireless device (BTS: Base Tra)
nsceiver Station), 3 is a base station controller (BSC: Ba)
seStation Controller), 4 is a network monitoring device (NMC), 5 is an operator, and 6 is a mobile switching center (MSC).
er).

MS1 is cdmaOne / W-CDMA
The mobile terminal of FIG. 1 is a wireless control unit, a call control unit 12, a BTS control unit 13, a neighbor list 14, a neighbor list management unit 15, and a maintenance operation control unit 16. The neighbor list 14 is a list in which candidate information for determining the destination BTS2 when the MS1 communicates is recorded based on the position information of the MS1 and the like. Even if the rank of the BTS2 candidate is high, the busy probability of the BTS2 is not necessarily low due to traffic, failure, or the like.

The BTS 2 is provided with a plurality of call channels (resources) so that it can simultaneously make and receive calls from a plurality of MSs 1 within a call area. The BTS 2 has a radio control unit 21, a call control unit 22, and a radio channel management. Unit 23, buffer management unit 24, CPU usage rate management unit 25, BTS busy control unit 2
6, a maintenance operation control unit 27, a BSC control unit 28, and a statistical processing unit 29.

The BTS2 busy means the case where the radio channel resource (traffic) in the radio section, the buffer in the BTS2, and the CPU usage rate of each card of the BTS2 are in the usage state above a specified value. In the BTS2 busy state, wireless channel resources (traffic) in the wireless section, the buffer in the BTS2, and the CP of each card of the BTS2
Since the U usage rate is full, there is a problem such as delay in incoming / outgoing call processing / call disabled.

The radio channel manager 23 manages normal call resources and handoff resources. M
In S1, if the power intensity of the BTS 2 other than the first candidate is equal to or higher than the specified value of the handoff process, the BT other than the first candidate
It is possible to set S2 as the handoff target. Normal,
The BTS2 other than the first candidate cannot be controlled as a normal call because they are different from the BTS2 closest to the MS1 (the power intensity is the strongest), but when the MS1 moves and the power intensity reaches a specified value or more, Handoff is enabled.

The BSC 3 has a plurality of BTSs under its control,
When the busy occurrence / release of busy of the subordinate BTS is detected, it has a function of notifying the location registered MS of the busy occurrence / release of BTS2. The call control unit 31, the neighbor list management unit 32, and the BTS busy control are provided. Part 33, BT
S control unit 34, handoff control unit 35, statistical processing unit 3
6, maintenance operation control unit 37, NMC control unit 38.

The NMC 4 has a function of requesting the busy notification of the BTS 2 to the BSC 3 in the time zone when the number of calls processed per unit time of the BTS 2 exceeds the specified value based on the information collected by the statistical information. 41, a BTS control unit 42, a statistical processing unit 43, a command control unit 44, a monitor control unit 45, an input control unit 46, and a station data management unit 47.

FIG. 2 is a layout diagram of a base station radio equipment (BTS) for explaining an embodiment of the present invention. In FIG. 2, reference numerals 2 ₁ , 2 ₂ , and 2 ₃ denote base station wireless devices (BTS # 1 to BTS #) arranged in their respective service areas.
In 3), the adjacent station and the service area are arranged so as to overlap each other so that a dead zone does not occur. Reference numeral 1 denotes a mobile terminal (MS), which exists in an area where the service areas of BTS # 1 and BTS # 2 overlap each other, so that a call path can be established from either BTS # 1 or BTS # 2. .

FIG. 3 is a calling sequence diagram in the first embodiment of the present invention. Hereinafter, the details of the calling operation when the MS 1 is in the call control area of the BTS # 1 will be described with reference to FIGS. (1) When the MS 1 communicates, the call controller 12 displays “Origin
ation Message ”() and edit it to the wireless controller 11 B
Make a transmission request for TS2. To determine the destination BTS2, the BTS control unit 13 selects the one recognized as the first candidate BTS2. The BTS control unit 13 selects, as the method of determining the first candidate BTS2, the one having the highest radio field intensity between MS1 and BTS2 and the one that is the first candidate in the neighbor list 14 (only BTS non-busy is targeted).

(2) The BTS # 1 sends "Origin" from the MS1.
When the wireless control unit 21 receives the "ation Message" (), the message is notified to the call control unit 22. The call control unit 22 sends "Base Station Ack" () as a reception response of the "Origination Message" (). The call is transmitted to the MS 1. The call control unit 22 displays “Origination Indicatio”.
Send n ″ () to BSC3.

(3) In the call control unit 31, the "Origination In
The content of "dication" () is scrutinized, and if there is no problem, the call connection processing is continued. In the call control unit 31, in order to secure the radio resource of BTS2, "Allocation R
esource Request ”() is transmitted. (4) The call control unit 22 of the BTS # 1 displays“ Allocation Res
When "ource Request" () is received, the wireless channel management unit 23 is requested to secure the wireless channel. When the wireless channel management unit 23 has no available wireless channel, the call control unit 22 is notified of the resource hunt NG. In the call control unit 22, the result of the radio channel reservation is the resource hunt N
In case of G, go to BSC3 and click “Allocation Resource Response
(Resource busy) ”() is sent.

(5) In the call control unit 31, "Allocation Res
When the “ource Response (resource busy)” () is received, the call disconnection process is executed. Thereafter, the call disconnection process is executed with the MSC 6 and the MS 1 disconnects the call (on-hook) with the MS 1. (6) In the call control unit 12, the "Base Station" from the BTS2
After receiving "Ack" (), "Traffic Channel Assignment M"
At this time, the call control unit 12
Start the "Traffic Channel Assignment Message" reception waiting timer. (7) In the call control unit 12, "Traffic Channel Assignment"
Message "Origination Message" for adjacent BTS2 triggered by timeout of reception waiting timer
() Is transmitted and the calling process is continued. In MS1,
The BTS control unit 13 determines the next candidate BTS2.

(8) BTS # 2 receives "Origin" from MS1.
When the wireless control unit 21 receives the "ation Message" (), the message is notified to the call control unit 22. The call control unit 22 sends "Base Station Ack" () as a reception response of the "Origination Message" (). It is sent to the MS 1. In the call control unit 22, "Origination Indication"
() Is transmitted to BSC3.

(9) In the call control unit 31, the "Origination In
The content of "dication" () is scrutinized, and if there is no problem, the call connection processing is continued. In the call control unit 31, in order to secure the radio resource of BTS2, "Allocation R
esource Request ”() is transmitted. (10) The call control unit 22 of the BTS # 2 displays“ Allocation Re
When "source Request" () is received, the wireless channel management unit 23 is requested to secure the wireless channel. In the wireless channel management unit 23, when there is a free wireless channel,
The call control unit 22 is notified of the resource hunt OK. In the call control unit 22, if the result of securing the wireless channel is the resource hunt OK, the call control unit 22 notifies the BSC 3 of “Allocation Resource Respon
Send se (normal) ”(“ 10 ”).

(11) In the call control unit 31, the "Allocation Re
If source response (normal) ”(“ 10 ”) is received,
Call processing is continued. In order to continue the calling process, the call control unit 31 sets “Begin Forward Traffic Comm.
and "(" 11 ") is transmitted to establish a traffic channel connection between MS1 and BSC3. FIG. 4 is a calling sequence diagram in the second embodiment of the present invention.

The calling operation when the MS 1 is in the call control area of the BTS # 1 will be described in detail below with reference to FIGS. (1) When the MS 1 communicates, the call controller 12 displays “Origin
ation Message ”() and edit it to the wireless controller 11 B
Make a transmission request for TS2. To determine the destination BTS2, the BTS control unit 13 selects the one recognized as the first candidate BTS2. The BTS control unit 13 selects, as a method of determining the first candidate BTS2, the one having the highest radio field intensity between MS1 and BTS2 and the one that is the first candidate in the neighbor list 14.

(2) The BTS # 1 sends "Origin" from the MS1.
When the wireless control unit 21 receives the "ation Message" (), the message is notified to the call control unit 22. The call control unit 22 sends "Base Station Ack" () as a reception response of the "Origination Message" (). The call is transmitted to the MS 1. The call control unit 22 displays “Origination Indicatio”.
Send n ″ () to BSC3.

(3) In the call control unit 31, the "Origination In
The content of "dication" () is scrutinized, and if there is no problem, the call connection processing is continued. In the call control unit 31, in order to secure the radio resource of BTS2, "Allocation R
esource Request ”() is transmitted. (4) The call control unit 22 of the BTS # 1 displays“ Allocation Res
When "ource Request" () is received, the wireless channel management unit 23 is requested to secure the wireless channel. When the wireless channel management unit 23 has no available wireless channel, the call control unit 22 is notified of the resource hunt NG. In the call control unit 22, the result of the radio channel reservation is the resource hunt N
In case of G, go to BSC3 and click “Allocation Resource Response
(Resource busy) ”() is sent.

(5) In the call control section 31, the "Allocation Res
When the “ource Response (resource busy)” () is received, the call disconnection process is executed. Thereafter, the call disconnection process is executed with the MSC 6 and the MS 1 disconnects the call (on-hook) with the MS 1. (6) In the call control unit 12, the "Base Station" from the BTS2
After receiving "Ack" (), "Traffic Channel Assignment C"
Wait for the reception of "ommand". At this time, the call control unit 12
Start the "Traffic Channel Assignment Command" reception wait timer.

(7) In the call control unit 12, the "Traffic Channe
l Assignment Command “Origination Meme for adjacent BTS2 triggered by timeout of reception waiting timer.
ssage "() is sent and call processing is continued. MS1
Then, the BTS control unit 13
The next candidate BTS2 (= BTS # 2) is selected, and the call control unit 1
Notify 2.

(8) The BTS # 2 sends "Origin" from the MS1.
When the wireless control unit 21 receives the "ation Message" (), the message is notified to the call control unit 22. The call control unit 22 sends "Base Station Ack" () as a reception response of the "Origination Message" (). The call is transmitted to the MS 1. The call control unit 22 displays “Origination Indicatio”.
Send n ″ () to BSC3.

(9) In the call control unit 31, the "Origination In
The content of "dication" () is scrutinized, and if there is no problem, the call connection processing is continued. In the call control unit 31, in order to secure the radio resource of BTS2, "Allocation R
esource Request ”() is transmitted. (10) The call control unit 22 of the BTS # 2 displays“ Allocation Re
When "source Request" () is received, the wireless channel management unit 23 is requested to secure the wireless channel. When the wireless channel management unit 23 has a free wireless channel, the call control unit 22 is notified of resource hunt OK. In the control unit 22, the result of securing the wireless channel is the resource hunt O.
If it is K, go to BSC3 and click “Allocation Resource Response
(Normal) ”(“ 10 ”) is sent.

(11) In the call control section 31, the "Allocation Relocation"
If source response (normal) ”(“ 10 ”) is received,
Call processing is continued. In order to continue the calling process, the call control unit 31 sets “Begin Forward Traffic Comm.
And "(" 11 ") is transmitted to connect the traffic channel between MS1 and BSC3. FIG. 5 is a neighbor list update sequence diagram according to the third embodiment of the present invention.

The operation of the neighbor list update call when the MS 1 is in the call control area of the BTS # 1 will be described in detail below with reference to FIGS. (1) The MS 1 performs location registration processing with the base station / exchange when the power is turned on or when the communication area changes. The call control unit 12 selects "Regi" for the BTS2 having the strongest radio wave strength among the pilot signals received from the plurality of BTSs 2.
stration "() is transmitted (hereinafter, BTS control unit 1
In B3, this BTS2 is the first candidate BTS) BT
"Registration" () for S2 is the wireless controller 1
Sent at 1.

(2) The BTS # 1 receives the "Regist from the MS1.
When the radio controller 21 receives "ration" (), the message is notified to the call controller 22. The call controller 22 sends "Registration" () to the BSC 3. (3) The call controller 31 The contents of "Registration" () are scrutinized, and if there is no problem, the location registration process is continued, and the call control unit 31 transmits "Location" () to the MSC 6 to request the location registration process.

(4) When the MSC 6 receives the "Location" (), the MSC 6 places the MS in the current communication area (BTS # 1).
The location registration information of 1 is updated. When the location registration process can be normally performed, the MSC 6 responds to the "Location" () with a "Locat-ion Updating Accepted" to the BSC 3.
Send (). (5) The call control unit 31 displays “Location Updating Accepte
When receiving "d" () and recognizing that the location registration process in MSC6 has been completed normally, "Reg-istrat" is sent to BTS2.
Send “ion Accepted” ().

(6) When the call control unit 22 receives "Registration Accepted" () from the BSC 3,
Recognizing that the location registration process in SC6 ended normally,
Send "Registration Accepted Order" () to MS1. “Registr-ation Accepted Order” to MS1
() Transmission is performed by the wireless control unit 21. (7) In the wireless control unit 11, the “Registra from BTS # 1
The call control unit 12 receives the "tion Accepted Order" ().
Notify to. In the call control unit 12, the “Registrat-ion Acce
Accepts "pted Order" () and recognizes that location registration has been completed successfully.

(8) The call control unit 31 transmits the neighbor list 14 for the communication area (BTS # 1) to the MS 1 whose location has been registered. The call control unit 31
The neighbor list 14 for the BTS # 1 is obtained from the neighbor list management unit 32. In the call control unit 31, the MS1
To send neighbor list 14 to “Neighbo-r Li
st Update ”() is sent.

(9) In the call control unit 22, the "Neighbor List"
Receive "Update" () and send "Neighbor List Up" to MS1.
Send "date" (). "Neighbor List" to MS1
Upd-ate "() transmission is performed by the wireless control unit 21. (10) The wireless control unit 11 receives the" Neighbor List Upd ".
ate ”() is notified to the call control unit 12. Call control unit 1
When the “Neighbor List Update” () is normally accepted, the 2 sends to the neighbor list management section 15 the neighbor list 1
Request the update process of 4. Neighbor list management unit 15
Updates the neighbor list 14 with the information of "Neighbor List Update" ().

FIG. 6 shows B in the fourth embodiment of the present invention.
It is a TS busy generation / cancellation sequence diagram. Below, Figure 1
And referring to FIG. 2 and following the reference numeral of FIG.
Details of the BTS busy generation / cancellation operation when in the call control area of TS # 1 will be described. (1) The call control unit 22 uses the "Allocation Res
When the "ource Request" () is received, the wireless channel management unit 23 is requested to secure the resources for the normal call. The wireless channel management unit 23 calls the call control unit 22 when the resources for the normal call are not available. The call control unit 22 notifies the BSC 3 of “Allocation Resource Responp” because the acquisition of the wireless channel has failed.
se (resource busy) ”() is sent.

(2) The call control unit 31 uses the "Allocation Resou
rce Response (resource busy) ”() is received and B
The TS busy controller 33 is notified of the BTS2 busy occurrence. In the BTS busy control unit 33, "BTS Busy Information (BTS Busy Information (B
(TS # 1 busy occurrence) ”() is notified. The BTS busy control unit 33 displays“ BTS Busy Information (BTS Busy Information) ”.
# 1 busy occurrence) "(), the call controller 31 requests the message transmission to the MS 1. The call controller 31 informs the BTS 2 of" BTS Busy Information (BTS #
1 Busy occurs) ”() is transmitted.

[Table 1] and [Table 2] show "BTS Busy Inf".
"ormation". For MS1 during a call,
Forward traffic channel messages [Table 1]
To notify the BTS2 busy information. The BTS2 busy information is notified to the non-calling MS1 using the paging channel message [Table 2]. The MSG_ID code described in each table is IS95 / 1.
Use the Reserved code in S2000. IS95 is recommended TIA / EIA / IS-95-
IS2000 is the recommended TIA / EIA / I
Refers to S-2000.

[0050]

[Table 1]

[0051]

[Table 2]

(3) In the call control unit 22, the "BTS Busy Infor
mation (BTS # 1 busy occurrence) "() is received," BTS Busy Information (BTS # 1 busy occurrence) "() is transmitted to the MS 1." BTS Busy Informati
The transmission of "on (BTS # 1 busy occurred)" () is performed by the wireless control unit 21. (4) In the maintenance operation control unit 16, the wireless control unit 11 sends "BT".
S Busy Information (BTS # 1 busy occurred) ”()
If it accepts, the neighbor list 1 is sent to the BTS controller 13.
Request to update the BTS # 1 information of No. 4. BTS controller 1
In 3, the BTS # 1 of the neighbor list 14 is updated to BTS busy.

(5) In the BTS busy control unit 26, when all the resources of the radio channel management unit 23, the buffer management unit 24, and the CPU usage rate management unit 25 have a vacancy (margin), "Busy Information (Busy Information ( Busy release) "
Send (). “Busy Information” to BSC3
(Release Busy) “() At the time of transmission, it is transmitted through the route of BTS busy control unit 26-maintenance operation control unit 27-BSC control unit 28.

(6) In the BTS controller 34, "Busy Infor"
mation (release busy) ”(), BTS
The busy control unit 34 is notified. BTS busy control unit 3
In No. 3, “BTS Busy Information (BTS # 1 Busy Release)” for all MS1s in the communication area of BTS # 1.
Notify (). In the BTS busy control unit 33, "BT
S Busy Information (BTS # 1 Busy Release) ”()
In order to notify the message, the call control unit 31 is requested to send a message to the MS 1. The call control unit 31 sends "BTS" to BTS2.
Busy Information (BTS # 1 busy release) "() is transmitted. The contents of" BTS Busy Information "are as shown in [Table 1] and [Table 2] described above.

(7) In the call control unit 22, "BTS Busy Infor"
When “mation (BTS # 1 busy release)” () is received, “BTS Busy Information (BTS # 1 busy release)” () is transmitted to the MS 1. “BTS Busy Informati
Transmission of “on (BTS # 1 busy release)” () is performed by the wireless control unit 21. (8) In the maintenance operation control unit 16, the wireless control unit 11 sends “BT”.
S Busy Information (BTS # 1 Busy Release) ”()
If it accepts, the neighbor list 1 is sent to the BTS controller 13.
Request to update the BTS # 1 information of No. 4. BTS controller 1
In 3, the BTS # 1 of the neighbor list 14 is updated to BTS non-busy.

FIG. 7 is a calling sequence diagram in the fifth embodiment of the present invention. Hereinafter, the BTS busy generation / cancellation operation when the MS 1 is in the call control area of the BTS # 1 will be described in detail with reference to FIGS. (1) In the BTS busy control unit 26, when the free space (margin) of any one of the radio channel management unit 23, the buffer management unit 24, and the CPU usage rate management unit 25 exceeds the allowable value, the BSC 3 receives “Busy Information”. (Busy)
Send (). “Busy Information” to BSC3
(Busy occurrence) ”() At the time of transmission, it is transmitted through the route of BTS busy control unit 26 → maintenance operation control unit 27 → BSC control unit 28.

(2) In the BTS controller 34, "Busy Infor"
mation (busy occurrence) ”() is received, BTS
The busy control unit 33 is notified. BTS busy control unit 3
In No. 3, “BTS Busy Information (BTS # 1 busy occurred)” for all MS1s in the communication area of BTS # 1.
Notify (). In the BTS busy control unit 33, "BT
S Busy Information (BTS # 1 busy occurrence) "()
In order to notify the message, the call control unit 31 is requested to send a message to the MS 1. The call control unit 31 sends "BTS Bu" to the BTS.
sy Information (BTS # 1 busy occurrence) "() is transmitted. The contents of" BTS Busy Information "are as shown in [Table 1] and [Table 2] described above.

(3) In the call control unit 22, the "BTS Busy Infor"
mation (BTS # 1 busy occurrence) "() is received," BTS Busy Information (BTS # 1 busy occurrence) "() is transmitted to the MS 1." BTS Busy Informati
The transmission of "on (BTS # 1 busy occurred)" () is performed by the wireless control unit 21. (4) In the maintenance operation control unit 16, the wireless control unit 11 sends "BT".
S Busy Information (BTS # 1 busy occurrence) "()
If it accepts, the neighbor list 1 is sent to the BTS controller 13.
Request to update the BTS # 1 information of No. 4. BTS controller 1
In 3, the BTS # 1 of the neighbor list 14 is updated to BTS busy.

(5) When the MS 1 communicates, the call controller 1
In step 2, "Origination Message" () is edited, and the wireless controller 11 is requested to send to the BTS. Destination BTS
For the determination, the BTS control unit 13 selects the one recognized as the first candidate BTS. The BTS control unit 13 selects, as the method of determining the first candidate BTS, the one having the highest radio field strength between MS1 and BTS2 and the one that is the first candidate in the neighbor list 14 (only BTS non-busy is targeted).

After that, the calling process is performed using BTS # 2. 8 and 9 are calling sequence diagrams in the sixth embodiment of the present invention. Hereinafter, the details of the handoff operation when the MS 1 is in the call control area of the BTS # 1 will be described with reference to FIGS. 1 and 2 and along the reference numerals of FIGS. 8 and 9. (1) In the BTS busy control unit 26, when the free space (margin) of any one of the radio channel management unit 23, the buffer management unit 24, and the CPU usage rate management unit 25 exceeds the allowable value, the BSC 3 receives “Busy Information”. (Busy occurs) ”
Send (). When sending "Busy Information (busy occurrence)" () to the BSC, the BTS busy control unit 26-> maintenance operation control unit 27-> BSC control unit 28 is transmitted.

(2) In the BTS controller 34, "Busy Infor"
mation (busy) ”() is received, BTS
The busy control unit 33 is notified. BTS busy control unit 3
In No. 3, “BTS Busy Information (BTS # 1 busy occurred)” for all MS1s in the communication area of BTS # 1.
Notify (). In the BTS busy control unit 33, "BT
S Busy Informatio (BTS # 1 busy occurred) ”()
In order to notify the message, the call control unit 31 is requested to send a message to the MS 1. The call control unit 31 sends "BTS" to BTS2.
Busy Information (BTS # 1 busy occurrence) "() is transmitted. The content of" BTS Busy Information "is as shown in [Table 1] and [Table 2] described above.

(3) In the call control unit 22, the "BTS Busy Infor
mation (BTS # 1 busy occurrence) "() is received," BTS Busy Information (BTS # 1 busy occurrence) "() is transmitted to the MS 1." BTS Busy Informati
The transmission of "on (BTS # 1 busy occurred)" () is performed by the wireless control unit 21. (4) In the maintenance operation control unit 16, the wireless control unit 11 sends "BT".
S Busy Information (BTS # 1 busy occurred) ”()
If it accepts, the neighbor list 1 is sent to the BTS controller 13.
Request to update the BTS # 1 information of No. 4. BTS controller 1
In 3, the BTS # 1 of the neighbor list 14 is updated to BTS busy.

(5) When the MS 1 communicates, the call control unit 1
In step 2, "Origination Message" () is edited, and a transmission request for the BTS2 is sent to the wireless controller 11. Destination BT
In the determination of S2, the BTS control unit 13 selects the one recognized as the first candidate BTS. The BTS controller 13
As the method for determining the first candidate BTS, the one having the highest radio field intensity between MS1 and BTS2, and the one that is the first candidate in the neighbor list 14 (only BTS non-busy is selected) are selected.

Thereafter, the call origination process is performed using BTS # 2. (6) The call control unit 12 executes handoff with an adjacent BTS in order to secure (handoff) a plurality of communication channels. The call control unit 12 determines the information of the adjacent BTS to the BTS control unit 13 from the received radio field intensity and the neighbor list 14. In FIG. 1, since the first candidate BTS # 1 is BTS busy and is not used as a normal call, the BTS busy controller 33 sets the first candidate BTS # 1 to the handoff BTS.
To choose as.

(7) The call control unit 12 transmits "Pilot Strength Measurement Message" () to the BTS # 2. “Pilot Strength Measurement Message”
The transmission of () is performed by the wireless control unit 11. (8) In the call control unit 22, the "Pilot StrengthMeasurement Message" () received on the traffic channel is
Send to BSC3.

(9) In the call control unit 31, the "Pilot Strength
Measurement Message ”(), handoff control unit 3
Notify 5. After that, the handoff control unit 35 determines that the MS1
A handoff sequence between BTS # 1 /
Perform a 2-way handoff using BTS # 2.
10 and 11 are handoff sequence diagrams in the seventh embodiment of the present invention.

Hereinafter, the details of the handoff operation when the MS 1 is in the call control area of the BTS # 2 will be described with reference to FIGS. 1 and 2 and along the reference numerals of FIGS. 10 and 11. (1) In the BTS busy control unit 26, when the free space (margin) of any one of the radio channel management unit 23, the buffer management unit 24, and the CPU usage rate management unit 25 exceeds the allowable value, the BSC 3 receives “Busy Information”. (Busy occurs) ”
Send (). “Busy Information” to BSC3
(Busy occurrence) ”() At the time of transmission, it is transmitted through a route of BTS busy control unit 26 → maintenance operation control unit 27 → BSC control unit 28. In this example, the wireless channel management unit 23
The following shows the case where the free (margin) of the Traffic Channel resource of exceeds the allowable value.

(2) In the BTS controller 34, "Busy Infor"
mation (busy (Traffic Channel busy) occurs) ”
When () is received, the BTS busy control unit 33 is notified. The BTS busy control unit 33 sends “BTS Busy Information” to all MSs 1 in the call area of BTS # 2.
(BTS # 2 busy occurred) ”() is notified. BTS
In the busy control unit 33, "BTS Busy Information (BT
S # 2 busy occurrence) "(), the call controller 31 requests the message transmission to the MS 1. The call controller 31 informs the BTS 2 of" BTS Busy Information (BTS
# 2 Busy In) ”() is transmitted.“ BTS Busy In
The contents of "formation" are described in [Table 1] and [Table 2] above.
As shown in.

(3) In the call control unit 22, "BTS Busy Infor"
mation (BTS # 2 busy occurrence) "() is received," BTS Busy Information (BTS # 2 busy occurrence) "() is transmitted to the MS 1." BTS Busy Informati
The transmission of “on (BTS # 2 busy)” () is performed by the wireless control unit 21. (4) In the maintenance operation control unit 16, the wireless control unit 11 sends “BT”.
S Busy Information (BTS # 2 busy occurrence) "()
If it accepts, the neighbor list 1 is sent to the BTS controller 13.
Request to update the BTS # 2 information of No. 4. BTS controller 1
In 3, the BTS # 2 of the neighbor list 14 is updated to BTS busy.

After that, in order for the MS to be able to release the resource for normal call of BTS # 2, the handoff is performed with the adjacent BTS to secure the communication channel. (5) The call control unit 12 executes handoff with an adjacent BTS in order to secure (handoff) a plurality of communication channels. The call control unit 12 determines the information of the adjacent BTS to the BTS control unit 13 from the received radio field intensity and the neighbor list 14. The BTS control unit 13 selects the second candidate BTS # 1 as the handoff BTS.

(6) The call control unit 12 transmits "Pilot Strength Measurement Message" () to BTS # 2. “Pilot Strength Measurement Message”
The transmission of () is performed by the wireless control unit 11. (7) The radio control unit 21 receives the “Pilot StrengthMeasurement Message” () received on the traffic channel.
To the BSC3.

(8) In the call control unit 31, the "Pilot Strength
Measurement Message ”(), handoff control unit 3
Notify 5. After that, the handoff control unit 35 determines that the MS1
A handoff sequence between BTS # 1 /
Perform a 2-way handoff using BTS # 2.
The call control unit 12 sets the B of the BTS # 2 after the 2-way handoff.
To alleviate the TS busy, the communication channel with BTS # 2 is released.

12 and 13 are handoff sequence diagrams in the eighth embodiment of the present invention. Below, Figure 1
The details of the handoff operation when the MS 1 is in the call control area of the BTS # 2 will be described with reference to FIGS. 12 and 13 and with reference to FIGS. (1) In the BTS busy control unit 26, when the free space (margin) of any of the radio channel management unit 23, the buffer management unit 24, and the CPU usage rate management unit 25 exceeds the allowable value, the BSC “Busy Information” (Busy)
Send (). “Busy Information” to BSC3
(Busy occurrence) ”() At the time of transmission, it is transmitted through the route of BTS busy control unit 26 → maintenance operation control unit 27 → BSC control unit 28. The case where the allowable value is exceeded or the CPU usage rate of the CPU usage rate management unit 25 exceeds the allowable value is shown.

(2) In the BTS controller 34, "Busy Infor"
mation (busy (system busy) occurrence) "() is received, the BTS busy control unit 33 is notified.
In the TS busy control unit 33, “BTS B-usy Information (BTS
# 2 busy occurrence) ”() is notified. The BTS busy control unit 33 sends a message to the MS1 to the call control unit 31 to notify“ BTS Busy Information (BTS # 2 busy occurrence) ”(). Request: Call control unit 31
Transmits "BTS Busy Information (BTS # 2 busy occurred)" () to BTS2. “BTS Busy Informa
The contents of "tion" are as shown in [Table 1] and [Table 2] described above.

(3) In the call control unit 22, the "BTS Busy Infor
mation (BTS # 2 busy occurrence) "() is received," BTS Busy Information (BTS # 2 busy occurrence) "() is transmitted to the MS 1." BTS Busy Informati
The transmission of “on (BTS # 2 busy)” () is performed by the wireless control unit 21. (4) In the maintenance operation control unit 16, the wireless control unit 11 sends “BT”.
S Busy Information (BTS # 2 busy occurrence) "()
If it accepts, the neighbor list 1 is sent to the BTS controller 13.
Request to update the BTS # 2 information of No. 4. BTS controller 1
In 3, the BTS # 2 of the neighbor list 14 is updated to BTS busy.

After that, in order for the MS to be able to release the resource for normal call of BTS # 2, the handoff is performed with the adjacent BTS to secure the call channel. (5) In the call control unit 12, a plurality of call channels are set. In order to secure (handoff), the handoff is performed with the adjacent BTS. The call control unit 12 determines the information of the adjacent BTS to the BTS control unit 13 from the received radio field intensity and the neighbor list 14. The BTS control unit 13 selects the second candidate BTS # 1 as the handoff BTS.

(6) The call control section 12 transmits "Pilot Strength Measurement Message" () to BTS # 2. “Pilot Strength Measurement Message”
The transmission of () is performed by the wireless control unit 11. (7) The radio control unit 21 receives the “Pilot StrengthMeasurement Message” () received on the traffic channel.
To the BSC3.

(8) In the call control unit 31, the "Pilot Strength
Measurement Message ”(), handoff control unit 3
Notify 5. After that, the handoff control unit 35 executes the handoff sequence with the MS, and the BTS # 1 / B
Perform a 2-way handoff using TS # 2. The call control unit 12 sends the BT of BTS # 2 after the 2-way handoff.
To alleviate the S busy, the communication channel with BTS # 2 is released.

FIG. 14 is a calling sequence diagram in the ninth embodiment of the present invention, and FIG. 15 is a time series diagram of BTS statistical information used in the operation of FIG. Hereinafter, with reference to FIG. 1, FIG. 2, and FIG. 15, along with the reference numerals of FIG. 14, the details of the calling operation when the MS 1 is in the call control area of the BTS # 1 will be described. (1) The BTS controller 42 in the NMC 4 sends “BTS Busy Request” to the BSC 3 at the time when the BTS busy occurs.
(BTS # 1 busy occurred) ”() is transmitted.

(2) In the NMC controller 38, "BTS Busy R
When equest (BTS # 1 busy occurrence) "() is received, the BTS busy control unit 33 is notified via the maintenance operation control unit 37. The BTS busy control unit 33 notifies the BTS
“BTS Busy Inf” for all MS1s in the # 1 call area
ormation (BTS # 1 busy occurrence) ”() is notified. The BTS busy control unit 33 displays“ BTS Busy Informa ”.
activation (BTS # 1 busy occurrence) "(), the call control unit 31 is requested to send a message to the MS 1. The call control unit 31 requests the BTS 2 to" BTS Busy Informati ".
on (BTS # 1 busy occurs) ”() is transmitted.
The contents of “BTS Busy Information” are described in [Table 1] above.
And as shown in [Table 2].

(3) In the call control unit 22, the "BTS Busy Infor
mation (BTS # 1 busy occurrence) "() is received," BTS Busy Information (BTS # 1 busy occurrence) "() is transmitted to the MS 1." BTS Busy Informati
The transmission of "on (BTS # 1 busy occurred)" () is performed by the wireless control unit 21. (4) In the maintenance operation control unit 16, the wireless control unit 11 sends "BT".
S Busy Information (BTS # 1 busy occurrence) "()
If it accepts, the neighbor list 1 is sent to the BTS controller 13.
Request to update the BTS # 2 information of No. 4. BTS controller 1
In 3, the BTS # 1 of the neighbor list 14 is updated to BTS busy.

After that, the MS is controlled by the BTS controller 13 so as to avoid using the BTS # 1 for communication. (5) The BTS controller 42 in the NMC sends "BTS Busy Request" to the BSC 3 at the time when the BTS busy is released.
(BTS # 1 busy release) ”() is transmitted. (6) In the NMC control unit 38,“ BTS Busy Request (BT
S # 1 busy release) ”() is received, the BTS busy control unit 33 is notified via the maintenance operation control unit 37. In the BTS busy control unit 33, all MSs 1 in the talk area of BTS # 1 are notified. In contrast, “BTS Busy Information (B
TS # 1 busy release) ”() is notified. The BTS busy control unit 33 notifies the“ BTS Busy Information (BTS #
1 Busy release) ”() to notify the call control unit 3
1 request to send a message to MS1. Call control unit 3
1 sends "BTS Busy Information (BTS # 1
(Releasing busy) ”() is sent.“ BTS Busy Infor
The contents of "mation" are as shown in [Table 1] and [Table 2] described above.

(7) In the call control unit 22, "BTS Busy Infor"
mation (BTS # 1 busy release) "() is received," BTS Busy Information (BTS # 1 busy release) "() is transmitted to the MS 1." BTS Busy Informati
Transmission of “on (BTS # 1 busy release)” () is performed by the wireless control unit 21. (8) In the maintenance operation control unit 16, the wireless control unit 11 sends “BT”.
S Busy Information (BTS # 1 Busy Release) ”()
If it accepts, the neighbor list 1 is sent to the BTS controller 13.
Request to update the BTS # 2 information of No. 4. BTS controller 1
In 3, the BTS # 1 of the neighbor list 14 is updated to BTS non-busy.

After that, the MS is controlled by the BTS controller 13 to use the BTS # 1 for communication. (Supplementary Note 1) A plurality of base station wireless devices are arranged under the control of a base station control device, and a plurality of communication channels that enable simultaneous transmission from a plurality of mobile terminals within a service area covered by each base station wireless device are provided. In the mobile telephone system, wherein the mobile terminal allocates one call channel in the base station wireless device each time a call from the mobile terminal occurs, the mobile terminal sends a call request to the first candidate base station wireless device. In the case where the call response is not returned to the mobile terminal, the mobile terminal determines a next candidate base station wireless device that is an adjacent station when the call response waiting time-out occurs, and to the determined next candidate base station wireless device. A CDMA mobile communication system comprising: means for transmitting a call request.

(Supplementary Note 2) The means for determining the next candidate base station wireless device by the mobile terminal causes the mobile terminal to hold a neighbor station information list, and refers to the neighbor station information list at the time of call origination. 2. The CDMA mobile communication system according to appendix 1, wherein the CDMA mobile communication system has a function of selecting a base station radio device of a call destination. (Supplementary Note 3) A plurality of base station wireless devices are arranged under the control of a base station control device, and a plurality of communication channels that enable simultaneous transmission from a plurality of mobile terminals within a service area covered by each base station wireless device are provided. In the mobile communication system, wherein the base station controller and the base station wireless device, which are base station side devices, are provided in the mobile communication system in which one mobile phone channel is allocated to the base station wireless device each time a call from the mobile terminal occurs. , At the time of location registration, at the time of handoff, and at the time of updating system parameters, the means for notifying the mobile station of the adjacent station information list and the adjacent station information list held in the mobile terminal are updated to the latest information. A CDMA mobile communication system comprising: means for updating.

(Supplementary Note 4) A plurality of base station radio devices are arranged under the control of a base station control device, and a plurality of mobile terminals capable of transmitting simultaneously from a plurality of mobile terminals within a service area covered by each base station radio device are provided. In a mobile communication system having a call channel and allocating one call channel in the base station radio device every time a call is originated from the mobile terminal, in the base station radio device subordinate to the base station control device, Means for detecting a busy occurrence or busy release, means for notifying the base station wireless device busy occurrence or busy cancellation to the location-registered mobile terminal, and the mobile terminal busy occurrence for the base station wireless device Alternatively, when the notification of releasing the busy is received, if the notified base station wireless device is in the adjacent station information list, the status of the base station wireless device is set to busy or busy. A CD comprising means for making a transition to a G-cancelled state and means for making a call request while avoiding the base station wireless device in the busy state at the time of transmission after the transition.
MA mobile communication system.

(Supplementary Note 5) A plurality of base station radio devices are arranged under the control of the base station control device, and a plurality of mobile terminals capable of simultaneously transmitting from a plurality of mobile terminals within the service area covered by each base station radio device are provided. In a mobile communication system having a call channel and allocating one call channel in the base station radio device every time a call is originated from the mobile terminal, a base station radio device as a first candidate at the time of calling and receiving a call Means for performing a call connection using the next candidate base station wireless device with resource busy, means for generating a handoff from the mobile terminal to the first candidate base station wireless device after the call connection,
A CDMA mobile communication system comprising means for establishing a plurality of call paths using a resource for handoff other than a resource for normal call which is resource busy.

(Supplementary Note 6) A plurality of base station radio equipments are arranged under the control of the base station control equipment, and a plurality of mobile terminals capable of transmitting simultaneously from a plurality of mobile terminals within the service area covered by each base station radio equipment are provided. In a mobile communication system comprising a call channel, wherein each time a call from the mobile terminal occurs, one call channel is assigned to the base station radio device, wherein the mobile terminal is the base station from the base station controller. Upon reception of a wireless device busy occurrence notification, means for performing handoff with a non-congested adjacent base station wireless device and switching a communication path, and upon receipt of the base station wireless device busy cancellation notification, the first candidate base station A CDMA mobile communication system comprising: means for performing handoff with a wireless device to secure a plurality of communication paths.

(Supplementary Note 7) A plurality of base station radio devices are arranged under the control of a base station control device, and a plurality of base station radio devices are allowed to simultaneously originate calls from a plurality of mobile terminals within a service area covered by each base station radio device. In a mobile communication system having a call channel and allocating one call channel in the base station radio device every time a call is originated from the mobile terminal, the base station radio device uses a CPU usage rate and an internal buffer. Means for detecting a temporary increase in the rate, means for analyzing the base station wireless device and time zone in which the traffic is temporarily concentrated from statistical information, and the base station wireless device for the base station during the time zone. Means for requesting transmission of a station wireless device busy notification to the mobile terminal.

(Supplementary Note 8) A plurality of base station radio equipments are arranged under the control of a base station control equipment, and a plurality of mobile terminals capable of transmitting simultaneously from a plurality of mobile terminals within a service area covered by each base station radio equipment. In a mobile communication system comprising a call channel, wherein one call channel is assigned to the base station radio device every time a call is originated from the mobile terminal, the network monitoring device includes the base station radio device in which traffic is concentrated. And means for analyzing the time zone from the statistical information, and means for requesting the base station radio apparatus to transmit the base station radio apparatus busy notification to the mobile terminal during the time zone. CD to do
MA mobile communication system.

(Supplementary Note 9) When a call is issued from a mobile terminal, the step of discarding the call request when the base station side has no free space for the normal call radio channel resource of the base station radio device, and the step of issuing the call request Selecting a next candidate base station wireless device from the adjacent station information list triggered by a call response waiting timeout; resending a call request to the selected next candidate base station wireless device; A computer-readable recording medium recording a program for causing the mobile terminal to execute a step of establishing a communication path with the base station wireless device after receiving a call response from the device.

[0092]

As described above, according to the present invention, the base station wireless device (B
It is possible to provide a CDMA mobile terminal communication system and its recording medium capable of improving the call connection rate when congestion occurs in TS) and distributing the load of call processing against a sudden increase in traffic.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a CDMA mobile communication system according to an embodiment of the present invention.

FIG. 2 is a layout diagram of a base station wireless device (BTS).

FIG. 3 is a calling sequence diagram in the first embodiment of the present invention.

FIG. 4 is a calling sequence diagram in a second embodiment of the present invention.

FIG. 5 is a neighbor list update sequence diagram according to the third embodiment of the present invention.

FIG. 6 is a BTS busy generation / cancellation sequence diagram according to the fourth embodiment of the present invention.

FIG. 7 is a calling sequence diagram in a fifth embodiment of the present invention.

FIG. 8 is a handoff sequence diagram (No. 1) according to the sixth embodiment of the present invention.

FIG. 9 is a handoff sequence diagram (2) in the sixth embodiment of the present invention.

FIG. 10 is a handoff sequence diagram (No. 1) according to the seventh embodiment of the present invention.

FIG. 11 is a handoff sequence diagram (2) according to the seventh embodiment of the present invention.

FIG. 12 is a handoff sequence diagram (No. 1) according to the eighth embodiment of the present invention.

FIG. 13 is a handoff sequence diagram (2) in the eighth embodiment of the present invention.

FIG. 14 is a calling sequence diagram in an embodiment 9 of the present invention.

FIG. 15 is a time series diagram of BTS statistical information.

FIG. 16 is a configuration diagram of a CDMA mobile communication system.

[Explanation of symbols]

1 Mobile terminal (MS) 2 Base station radio equipment (BTS) 3 Base station controller (BSC) 4 Network monitoring device (NMC) 5 operators 6 Mobile Switching Center (MSC) 11 Wireless controller 12 Call control unit 13 BTS controller 14,14 'Neighbor list (neighboring station information list) 15 Neighbor List Management Department 16 Maintenance operation control unit 21 Wireless controller 22 Call control unit 23 Radio Channel Management Unit 24 Buffer management section 25 CPU usage rate management unit 26 BTS busy controller 27 Maintenance operation control unit 28 BSC control unit 29 Statistical Processing Department 31 Call control unit 32 Neighbor List Management Department 33 BTS busy controller 34 BTS controller 35 Handoff control unit 36 Statistical Processing Department 37 Maintenance operation control unit 38 NMC control unit 41 BSC control unit 42 BTS controller 43 Statistical Processing Department 44 Command control unit 45 Monitor control unit 46 Input control unit 47 station data management department

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuko Tangiku             2-53, Jomi, Chuo-ku, Osaka City, Osaka Prefecture             Inside Fujitsu Kansai Chubu Nettech Co., Ltd. (72) Inventor Kenji Ogawa             2-53, Jomi, Chuo-ku, Osaka City, Osaka Prefecture             Inside Fujitsu Kansai Chubu Nettech Co., Ltd. (72) Inventor Kengo Chikushi             2-53, Jomi, Chuo-ku, Osaka City, Osaka Prefecture             Inside Fujitsu Kansai Chubu Nettech Co., Ltd. F term (reference) 5K022 EE02 EE21 EE31                 5K067 AA12 CC10 DD23 DD24 EE02                       EE10 EE16 EE24 GG01 HH23                       JJ71

Claims (5)

[Claims] 1. A plurality of communication channels, wherein a plurality of base station radio devices are arranged under the control of a base station control device, and a plurality of mobile terminals can simultaneously make calls within a service area covered by each base station radio device. And a call request from the mobile terminal to the base station wireless device of the first candidate in a mobile communication system that allocates one call channel in the base station wireless device each time a call is generated from the mobile terminal. When a call response is not returned to the mobile terminal, the mobile terminal determines a next candidate base station wireless device that is an adjacent station when a call response waiting timeout occurs, and the determined next candidate base station wireless device. And a means for transmitting a call request to the CDMA mobile communication system. 2. A plurality of communication channels, in which a plurality of base station radio devices are arranged under the control of a base station control device, and a plurality of mobile terminals can simultaneously make calls within a service area covered by each base station radio device. In a mobile communication system that allocates one communication channel in the base station wireless device each time a call is generated from the mobile terminal, wherein the base station control device and the base station wireless device are base station side devices. Is a means for notifying the mobile terminal of the adjacent station information list triggered by any one of location registration, handoff, and system parameter update, and the latest information of the adjacent station information list held in the mobile terminal. And a means for updating the CDM.
A mobile communication system. 3. A plurality of communication channels, wherein a plurality of base station radio devices are arranged under the control of a base station control device, and a plurality of mobile terminals can simultaneously make calls within a service area covered by each base station radio device. In the mobile communication system, wherein the base station radio device assigns one communication channel each time a call is originated from the mobile terminal, the base station control device being under control of the base station radio device being busy. Or means for detecting a busy cancellation, means for notifying the mobile terminal of which location has been registered that the base station wireless device is busy or released, and the mobile terminal is busy or busy for the base station wireless device. When the release notification is received, if the notified base station wireless device is in the neighboring station information list, the state of the base station wireless device is busy or is released. C, characterized in that it comprises means for transition to the state, and means for performing a call request to avoid the base station radio unit busy when placing after the transition
DMA mobile communication system. 4. A plurality of communication channels, wherein a plurality of base station radio devices are arranged under the control of a base station control device, and a plurality of mobile terminals can simultaneously make calls within a service area covered by each base station radio device. In the mobile communication system, wherein the mobile station allocates one communication channel in the base station wireless device each time a call is originated from the mobile terminal, the network monitoring device includes the base station wireless device and time when traffic is concentrated. CDMA mobile having means for analyzing a band from statistical information, and means for requesting the base station wireless device to transmit the base station wireless device busy notification to the mobile terminal during the time period. Communications system. 5. In a call from a mobile terminal, a step of discarding the call request when the base station side does not have a vacant radio channel resource for a normal call of a base station radio device, and a call response to the call request Selecting a next candidate base station wireless device from the adjacent station information list triggered by a wait timeout; resending a call request to the selected next candidate base station wireless device; and from the base station wireless device The computer-readable recording medium having recorded thereon a program for executing the step of establishing a communication path with the base station wireless device after the mobile terminal receives the call response.