JP2001352570A - Mobile station calling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely deliver paging signals from an exchange to a mobile station in a URA connection state and to make the exchange surely receive paging response signals from the mobile station. SOLUTION: In this mobile station calling method, the paging signals are sent out from the CS domain 101 of the exchange 100 to a serving base station control station 103, the paging signals are transmitted to a drift base station control station 104 together with URA paging signals and the drift base station control station holds the paging signals and also transmits the URA paging signals to the mobile station 105. The mobile station transmits cell updating signals through the drift base station control station to the serving base station control station, the PS domain 102 of the exchange performs the processing of relocation and the mobile station is moved to the control of the drift base station control station. The paging signals held by the drift base station control station are transmitted to the mobile station and the mobile station returns the paging response signals through the drift base station control station to the exchange.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for calling a mobile station, and more particularly to a method for calling a mobile station in a URA connection state.

[0002]

2. Description of the Related Art In a third-generation digital mobile telephone system, a mobile station is connected to a network even without transmitting / receiving packets, and this state is called a URA connected state. A cell connection (Cell Connect) that is actually transmitting and receiving packets
ed) Distinct from state. The URA here is
UTRAN Routing Area (UTRAN Routing Area), and UTRAN (UMTS Terrestrial Radio)
Access Network) is UMTS (Universal Mobile Tel)
ecommunication System) means a global radio access network. Hereinafter, the concept of the URA connection state will be described with reference to FIG. The top-level switching center 100 is a functional part for circuit switching,
Voice data transmission / reception processing, call processing, CS (Circuit Switch) domain that performs management of the previous location information of the mobile station, and a packet exchange function part, and packet data transmission / reception processing Has a PS (Packet Switch) domain that manages the latest location information of mobile stations, etc.
The respective switching processing functions of communication by circuit switching mainly using voice communication and communication by packet switching mainly using data are executed. Here, the location information of the mobile station indicates information of a service area where the mobile station is located. The exchange 100 has a plurality of base station controllers under its control, and each base station controller has a function of controlling the base station. Further, each base station controls a mobile station within its service area. The base station control station is called a serving base station control station when its subordinate base station is transmitting and receiving data to and from a mobile station within its service area. In the following,
Data transmission / reception refers to transmission / reception of packet data. Also, when a mobile station moves from the service area of one base station to the service area of another base station,
A base station control station having a base station in a moved service area under its control is called a drift base station control station.

[0003] In FIG. 4, in the URA connection state, the mobile station 105 is initially located within the service area 108 of the base station 106 under the control of the serving base station control station 103. It is shown that the mobile station has moved into the service area 109 of the base station 107 under the control of the station 104. At this time, in the case of the URA connection state, normally, the control of the mobile station 105 is shifted from the control of the serving base station control station 103 to the control of the drift base station control station 104. Is not done.

FIG. 5 explains the relationship between the cell connection state and the URA connection state. When the mobile station is transmitting and receiving data to and from the base station, the connection state of the mobile station to the network is a cell connection (Cell Connect).
ed) State 201. Here, the cell (Cell) is
In the service area, the mobile station can communicate with the base station. Also, between the mobile station and the base station,
When the state in which no data is transmitted or received continues for a predetermined time or more, the connection state of the mobile station to the network becomes URA.
The connection state 202 is set.

FIG. 6 illustrates a conventional method of calling a mobile station in a URA connection state. As a configuration of the communication system in this case, as shown in FIG. 6, an exchange 100, a serving base station control station 103, a drift base station control station 104, and a mobile station 105 are shown. Further, the switching center 100 includes a CS domain 101 and P
And an S domain 102. After the mobile station 105 performs data transmission and reception with the PS domain 102 of the exchange 100, there is no data transmission or reception for a predetermined time or more.
When a call is generated from the CS domain 101 of the exchange 100 to the mobile station 105 in the RA connection state, the CS domain 101 having the call processing function inquires the PS domain 102 of the location of the mobile station 105. (Step S401) The mobile station 10 stored in the PS domain 102 from the PS domain 102 based on packet communication performed immediately before with the mobile station 105.
5 is received (step S
402), the CS domain 101 sends a paging (calling) signal to the serving base station control station 103 controlling the base station controlling the service area where the mobile station 105 is located (step S403). Accordingly, serving base station control station 103 transmits a URA paging signal to the base station control station (step S
404), when receiving the URA paging signal, the base station control station transmits the URA paging signal from the subordinate base station via radio (step S405).

[0006] Upon receiving the URA paging signal, the mobile station 105 requests the base station control station that transmitted the URA paging signal, that is, the drift base station control station 104, to update the cell including the location information of the mobile station. A cell update (Cell Update) signal is transmitted (step S406),
The drift base station control station 104 transfers a cell update signal to the serving base station control station 103 using an uplink signal (step S407). Here, signal transfer refers to transmitting an input signal as it is without processing it. Upon receiving the cell update signal, the serving base station control station 103 sends a relocation required signal including the location information of the mobile station 105 to the PS domain 102 (step S408). PS domain 102
Corresponds to the notified position of the mobile station 105 in response to the relocation required signal,
The control is shifted from the control of the serving base station control station 103 to the control of the drift base station control station 104 (step S409).

At this time, CS domain 1 of exchange 100
No response is returned to the CS domain 101 in response to the paging signal transmission from step 01 (step S403).
In the CS domain 101, the paging response wait times out (step S410). Therefore, based on the information obtained in step S402, the CS domain 101 sends out a paging signal to the serving base station control station 103 again (step S411), and the serving base station control station 1
03 transmits a paging signal via wireless communication (step S412). However, at this time, the mobile station 105
Is the base station 10 under the control of the serving base station control station 103.
6 does not exist in the service area 108, no paging signal arrives, and therefore, no incoming call response from the mobile station 105 is made.

[0008]

As described above, in the conventional mobile station paging method, when a call is made from the CS domain of the exchange in the URA connection state, the paging signal transmitted from the CS domain is transmitted to the mobile station. , The mobile station did not respond. This is because, in the example of FIG. 6, the position of the mobile station 105 recognized by the CS domain 101 is determined by the serving base station, which is held in the PS domain 102 by the packet communication performed immediately before, which is known in step S402. Station control station 1
03, the mobile station 105 is already in the service area 1 of the base station 107 under the control of the drift base station control station 104.
This is because it has moved within 09. However, since the response (paging response) from the mobile station includes various information such as information on the capability of the mobile station and the number information, if there is no paging response from the mobile station, the CS domain performs call processing. Cannot be completed, and the call is not connected.

The present invention has been made in view of the above circumstances, and in a URA connection state, a mobile station moves from a service area of a base station under the control of a serving base station control station to a base station under the control of a drift base station control station. Even when moving to the service area of the station, a paging signal can be transmitted from the CS domain of the exchange to the mobile station via the drift base station control station, and therefore, a response from the mobile station to the CS domain can be transmitted. It is intended to provide a mobile station calling method that can be returned.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 relates to a method of calling a mobile station, and when a mobile station calls a mobile station from an exchange station when the mobile station is in a URA connection state. Transmitting a paging signal from the CS domain of the exchange to the serving base station controller according to the position of the mobile station at the time of previous data transmission / reception, and the serving base station controller piggybacks the paging signal on the URA paging signal. By transmitting to the drift base station control station, the drift base station control station holds the paging signal and transmits the URA paging signal to the mobile station, and the mobile station transmits a cell update signal to the drift base station control station. The PS domain of the exchange performs relocation processing by transmitting to the serving base station controller via When the mobile base station transmits from the control of the serving base station control station to the control of the drift base station control station, the drift base station control station transmits the held paging signal to the mobile station. Is returned to the exchange via the drift base station control station.

Further, the invention according to claim 2 relates to the mobile station paging method according to claim 1, wherein, when the paging signal transmitted from the drift base station control station does not reach the mobile station, the CS domain of the exchange station. Retransmits the paging signal to the mobile station via the drift base station control station, whereby the mobile station returns a paging response signal to the exchange via the drift base station control station.

According to a third aspect of the present invention, there is provided the mobile station calling method according to the second aspect, wherein the CS domain of the switching center retransmits the paging signal due to a timeout of waiting for a paging response signal from the mobile station. It is characterized by performing.

According to a fourth aspect of the present invention, there is provided the mobile station calling method according to the second or third aspect, wherein
The S domain knows the drift base station control station to which the paging signal should be transmitted by inquiring the PS domain of the switching center about the location of the mobile station after the relocation.

According to a fifth aspect of the present invention, there is provided a method for calling a mobile station, wherein when the mobile station calls the mobile station from the exchange when the mobile station is in a URA connection state, the mobile station is called from the CS domain of the exchange. A paging signal is transmitted to the serving base station control station according to the position at the time of previous data transmission / reception, and the serving base station control station transmits the paging signal to the URA.
Carry on the paging signal and transmit to the mobile station via the drift base station control station, the mobile station holds the paging signal and transmits the cell update signal to the serving base station control station via the drift base station control station By doing so, when the PS domain of the exchange performs relocation processing and shifts the mobile station from the control of the serving base station control station to the control of the drift base station control station, the paging held by the mobile station A paging response signal is returned to the exchange via the drift base station control station in response to the signal.

According to a sixth aspect of the present invention, there is provided the mobile station paging method according to any one of the first to fifth aspects, wherein the CS domain of the exchange exchanges the PS domain with the PS domain of the switching station to inquire the PS domain last time. It is characterized by knowing the position when transmitting and receiving data.

According to a seventh aspect of the present invention, there is provided the mobile station paging method according to any one of the first to sixth aspects, wherein the drift base station control station transmits the paging response signal to the initial state from the mobile station. It is characterized in that it is included in the UE message and returned to the exchange.

[0017]

According to the configuration of the present invention, when the mobile station calls the mobile station from the switching station when the mobile station is in the URA connection state, the serving base station is transmitted from the CS domain of the switching station according to the position of the mobile station at the time of the previous data transmission and reception. When the paging signal is transmitted to the control station, the serving base station control station piggybacks the paging signal on the URA paging signal and transmits the paging signal to the drift base station control station. The drift base station control station temporarily holds the paging signal and transmits a URA paging signal to the mobile station. Then, when the mobile station transmits the cell update signal to the serving base station control station via the drift base station control station, the PS domain of the exchange performs relocation processing, and places the mobile station in the serving base station control station. The control is shifted from the control to the control of the drift base station control station. In this state, the paging signal held by the drift base station control station is transmitted to the mobile station, so that the paging signal reliably reaches the mobile station, and the paging signal is transmitted by the mobile station to the drift base station in response to the paging signal. Since the information is returned to the exchange via the central office, the exchange can reliably receive the paging response signal.

In another configuration of the present invention, in the above configuration, when the paging signal transmitted by the drift base station control station does not reach the mobile station due to a bad radio wave condition or the like, the CS domain of the exchange station is changed. Since the paging signal is retransmitted to the mobile station via the drift base station control station according to the position of the mobile station after the relocation, the paging signal reliably reaches the mobile station, and the mobile station responds to the paging signal with a paging response. Since the signal is returned to the exchange via the drift base station controller, the exchange can reliably receive the paging response signal.

In still another configuration of the present invention, when the mobile station calls the mobile station from the exchange when the mobile station is in the URA connection state, the mobile station is moved from the CS domain of the exchange to the position of the mobile station at the last data transmission / reception. Accordingly, when the paging signal is transmitted to the serving base station control station, the serving base station control station superimposes the paging signal on the URA paging signal and transmits the paging signal to the mobile station via the drift base station control station. Arrives at the mobile station. And
While the mobile station temporarily holds the paging signal,
By transmitting the cell update signal to the serving base station controller via the drift base station controller, the switching station PS
The domain performs the relocation process and shifts the mobile station from the control of the serving base station controller to the control of the drift base station controller. In this state, the paging response signal is returned to the exchange via the drift base station control station in accordance with the paging signal held by the mobile station, so that the exchange can reliably receive the paging response signal.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. The description will be specifically made using an embodiment. In the following, since the mobile station 105 first communicates with the PS domain 102 of the exchange 100 and has not transmitted or received data for a predetermined time or more,
In the state of transition to the RA connection state, the mobile station 10 moves from the service area 108 of the serving base station control station 103 to the service area 109 of the drift base station control station 104, and then moves from the CS domain 101 of the exchange 100 to the mobile station 10.
An example in the case where an incoming call to the terminal 5 occurs will be described.

First Embodiment Hereinafter, as a first embodiment, the serving base station control station
When a paging signal from the CS domain of the exchange is received, the paging signal is piggybacked on the URA paging signal, transmitted to the drift base station control station and held in memory, and held after completion of relocation. A process for transmitting the paging signal to the mobile station will be described. In this example, the CS domain 101, P
The functions and operations of the switching station 100 including the S domain 102, the serving base station control station 103, and the mobile station 105 are as follows.
It is similar to that shown in FIG. Each base station control station
In addition to the same functions and operations as in the example shown in FIG. 4, a memory is provided so that a paging signal from the exchange can be temporarily held.

FIG. 1 is a diagram showing a mobile station calling method according to a first embodiment of the present invention. Next, a mobile station calling method of this example will be described with reference to FIG. Mobile station 1
05 performs data transmission / reception with the PS domain 102 of the switching center 100, and then performs no data transmission / reception for a predetermined time or more.
When a call is issued from the CS domain 101 to the mobile station 105, the CS domain 101
Inquire about the location of the mobile station 105 at step 02 (step S101). In contrast, the PS domain 102
The information of the serving base station control station 103 covering the service area where the mobile station 105 is located is stored in the CS domain 1
01 (step S102). The CS domain 101 of the switching center 100 includes a serving base station control station 103
, A paging (calling) signal is transmitted (step S103). The serving base station control station 103 that has received this paging signal transmits a URA paging signal to each base station control station (step S104).
However, at this time, the serving base station control station 103 piggybacks the paging signal from the CS domain 101 on the URA paging signal transmitted to each base station control station. Here, the sharing means that, for example, the URA paging signal and the C
This means that the paging signal from the S domain 101 is sent together as it is.

When each base station control station receives the URA paging signal from the serving base station control station 103, it temporarily stores the paging signal from the shared CS domain 101 in a memory (not shown). (Step S1
05), transmitting only the URA paging signal to the service area covered by each base station control station (step S1)
06). The mobile station 105 in any one of the service areas
When receiving a URA paging signal, cell update (Cell U)
pdate) signal to the base station control station that transmitted the URA paging signal, ie, the drift base station control station 104A.
(Step S107). The drift base station control station 104A transfers the uplink signal transmission signal including the cell update signal from the mobile station 105 to the serving base station control station 103 (Step S108). When the serving base station control station 103 determines that the uplink signal transmission signal from the drift base station control station 104A includes the cell update signal from the mobile station 105, the serving base station control station 103 includes location information of the mobile station 105. A required signal is sent to the PS domain 102 (step S109). The PS domain 102 activates a relocation process by receiving the relocation required signal (step S110). By the relocation process, the mobile station 1
The control of 05 is transferred from the serving base station control station 103 to the drift base station control station 104A.

After completion of the relocation process, the drift base station control station 104A transmits the paging signal from the CS domain 101 stored in the memory to the mobile station 105 via radio (step S111). Mobile station 1
05, when receiving the paging signal, returns a paging response signal to the drift base station control station 104A (step S112). The drift base station control station 104A, which has received the paging response signal from the mobile station 105,
00 is the first message from the mobile station 105 that includes this paging response signal in the CS domain 101,
Send an initial UE (User Equipment) message. As a result, the CS domain 101 becomes the mobile station 10
5 can be received.

As described above, according to the mobile station calling method of this example, the paging signal from the CS domain of the exchange is piggybacked in the URA paging signal from the serving base station controller to the drift base station controller. Submit,
The paging signal is stored in the drift base station control station. Then, based on the cell update signal from the mobile station, after the PS domain performs relocation processing by the relocation request signal transmitted by the serving base station control station, the drift base station control station stores the relocation processing in a memory. To send the paging signal to the mobile station,
Since the paging signal surely reaches the mobile station and the paging response signal sent by the mobile station is returned to the CS domain of the exchange via the drift base station control station, the exchange can receive the paging signal from the mobile station. Paging response signal
It can be received reliably.

Second Embodiment Next, as a second embodiment, in addition to the processing of the first embodiment,
After the relocation, the drift base station control station transmits a paging signal to the mobile station via radio, but if the paging signal does not reach the mobile station due to a temporary poor radio wave condition, the paging signal is held in the PS domain. A process for retransmitting a paging signal using the relocated position information will be described. In this example, CS
Exchange 10 including domain 101 and PS domain 102
0, the serving base station control station 103, the drift base station control station 104A, and the function and operation of the mobile station 105 are as follows.
It is similar to that shown in FIG.

FIG. 2 is a diagram showing a mobile station calling method according to a second embodiment of the present invention. Next, a mobile station calling method of this example will be described with reference to FIG. Mobile station 1
05 performs data transmission / reception with the PS domain 102 of the switching center 100, and then performs no data transmission / reception for a predetermined time or more.
When a call is issued from the CS domain 101 to the mobile station 105, the CS domain 101
Inquiry about the location of the mobile station 105 is made (step S201). In contrast, the PS domain 102
The information of the serving base station control station 103 covering the service area where the mobile station 105 is located is stored in the CS domain 1
01 (step S202). The CS domain 101 of the switching center 100 includes a serving base station control station 103
, A paging signal is transmitted (step S20).
3). The serving base station control station 103 that has received the paging signal transmits a URA to each lift base station control station.
The paging signal is transmitted (step S204). At this time, the serving base station control station 103 includes the CS domain 1 in the URA paging signal to be transmitted to each base station control station.
The paging signal 103 from 01 is piggybacked.

When each base station control station receives the URA paging signal from the serving base station control station 103, it temporarily stores the paging signal from the shared CS domain 101 in a memory (not shown). (Step S2
05), transmitting only the URA paging signal to the service area covered by each base station control station (step S2)
06). The mobile station 105 in any one of the service areas
When receiving a URA paging signal, cell update (Cell U)
pdate) signal to the base station control station that transmitted the URA paging signal, ie, the drift base station control station 104A.
(Step S207). The drift base station control station 104A transfers the uplink signal transmission signal including the cell update signal from the mobile station 105 to the serving base station control station 103 (Step S208). When the serving base station control station 103 determines that the uplink signal transmission signal from the drift base station control station 104A includes the cell update signal from the mobile station 105, the serving base station control station 103 includes location information of the mobile station 105. A request signal is sent to the PS domain 102 (step S209). The PS domain 102 activates the relocation process by receiving the relocation required signal (step S210). By the relocation process, the mobile station 1
The control of 05 is transferred from the serving base station control station 103 to the drift base station control station 104A. The above processing is
This is the same as the case of the first embodiment shown in FIG.

After the end of the relocation process, the drift base station control station 104A transmits the paging signal from the CS domain 101 stored in the memory to the mobile station 105 via radio (step S211). The mobile station 105 cannot receive a paging signal from the drift base station control station 104A due to a poor radio wave condition, so that the CS domain 101 of the exchange 100 waits for an incoming response waiting for a paging signal from the mobile station 105. (Step S212). This gives C
In the S domain 101, the paging signal is retransmitted. Before transmitting the paging signal to be retransmitted, the CS domain 101 inquires the PS domain 102 of the exchange 100 about the location of the mobile station 105 again ( Step S213). On the other hand, PS domain 102
Is the drift base station control station 104A covering the service area where the mobile station 105 after the relocation is located.
Is returned to the CS domain 101 (step S2).
14).

[0030] The CS domain 101 transmits a paging signal to the drift base station control station 104A (step S).
215). Drift base station control station 104A that has received the paging signal transmits a paging signal to mobile station 105 via radio (step S216). Mobile station 1
05 returns a paging response signal to the drift base station control station 104A when receiving a paging signal (step S217). The drift base station control station 104A
When receiving a paging response signal from the mobile station 105,
For the CS domain 101, this is the first message from the mobile station 105 including this paging response signal.
Transmit an initial UE message (step S21)
8). As a result, the CS domain 101 becomes the mobile station 1
05 can be received.

As described above, according to the mobile station calling method of this example, the paging signal from the CS domain of the exchange is piggybacked in the URA paging signal from the serving base station controller to the drift base station controller. Submit,
The paging signal is stored in the drift base station control station. After the PS domain performs relocation processing based on the relocation required signal transmitted by the serving base station control station based on the cell update signal from the mobile station, the drift base station control station stores the relocation data in the memory. Is transmitted to the mobile station, but when the mobile station cannot receive the paging signal due to a temporary poor radio wave condition, the CS domain determines the location of the mobile station after the relocation. Since the mobile station sends a paging signal to the mobile station via the drift base station control station where the mobile station is located,
By returning the paging response signal from the mobile station to the CS domain via the drift base station control station, the switching station can reliably receive the paging response signal from the mobile station.

Third Embodiment Next, as a third embodiment, the paging signal from the CS domain of the exchange, which is included in the URA paging signal from the serving base station control station, is stored in the drift base station control station in memory. Rather, a description will be given of a process for transmitting a URA paging signal including a paging signal from the CS domain when transmitting a URA paging signal to a service area covered by the drift base station control station via radio. In this example, the functions and operations of the switching center 100 including the CS domain 101 and the PS domain 102, the serving base station control station 103, and the drift base station control station 104 are the same as those shown in FIG. . The mobile station 105 has a memory in addition to the same functions and operations as the example shown in FIG. 4, and can temporarily hold a paging signal from the exchange. FIG. 3 is a diagram showing a mobile station calling method according to a third embodiment of the present invention. Next, a mobile station calling method of this example will be described with reference to FIG.

After the mobile station 105 transmits / receives data to / from the PS domain 102 of the exchange 100, there is no data transmission / reception for a predetermined time or more. When a call to the mobile station 105 occurs from the
01 inquires the PS domain 102 about the location of the mobile station 105 (step S301). On the contrary,
The PS domain 102 returns information of the serving base station control station 103 covering the service area where the mobile station 105 is located to the CS domain 101 (step S3).
02). The CS domain 101 of the exchange 100 sends a paging signal to the serving base station controller 103 (step S303). The serving base station control station 103 that has received the paging signal transmits a URA paging signal to each base station control station (step S304). At this time, the serving base station control station 103
Causes the URA paging signal transmitted to each base station controller to be piggybacked with the paging signal 103 from the CS domain 101. The above processing is the same as in the case of the first embodiment shown in FIG.

Each base station control station transmits, via radio, the URA paging signal including the paging signal received from the serving base station control station 103 to the service area covered by each base station control station (step S30).
5). If the mobile station 105 in any of the service areas
When receiving an RA paging signal, a cell update (Cell Upd
ate) signal to the base station control station that transmitted the URA paging signal, that is, the drift base station control station 104 (step S306). Drift base station control station 1
04 transfers the uplink signal transmission signal including the cell update signal from the mobile station 105 to the serving base station control station 103 (step S307). Serving base station control station 10
3 determines that the uplink signal transmission signal from the drift base station control station 104 includes the cell update signal from the mobile station 105, and outputs a relocation required signal including the location information of the mobile station 105. , PS domain 10
2 (step S308). PS domain 10
2 starts relocation processing by receiving the relocation required signal (step S30).
9). By the relocation process, control of the mobile station 105 is transferred from the serving base station control station 103 to the drift base station control station 104.

After the relocation processing, the mobile station 105
A paging response signal corresponding to the paging signal from CS domain 101 stored in the memory is transmitted to drift base station control station 104 via wireless communication (step S
310). The drift base station control station 104
When the paging response signal is received from the mobile station 105, the UE transmits an initial UE message including the paging response signal to the CS domain 101 (step S311). As a result, the CS domain 101 can receive a paging signal from the mobile station 105.

As described above, according to the mobile station paging method of this example, the paging signal from the CS domain of the exchange is piggybacked in the URA paging signal from the serving base station controller to the drift base station controller. The paging signal is stored in the mobile station by transmitting to the mobile station via the drift base station control station.
Then, after the relocation process ends, the mobile station
A paging response signal corresponding to a paging signal from the CS domain is transmitted to the drift base station control station, and the paging response signal is transmitted from the drift base station control station to the CS domain by being included in an initial UE message. Can reliably receive the paging response signal from the mobile station 105.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and there may be design changes and the like without departing from the gist of the present invention. Even this is included in the present invention. For example, the cell (Ce
The size of ll) may be equal to the service area, or may be a size obtained by further dividing the service area.

[0038]

As described above, according to the mobile station calling method of the present invention, when a call is made from the exchange to the mobile station in the URA connection state, the paging signal from the exchange is transmitted to the serving base station. URA from control station
The paging signal is piggybacked and sent to the drift base station control station and held in the drift base station control station. After the relocation of the mobile station is completed, the paging signal held in the drift base station control station is sent to the mobile station. Since the mobile station returns a paging response signal to the exchange in response to the paging signal, the paging signal from the exchange can be reliably delivered to the mobile station, and the paging from the mobile station can be reliably performed at the exchange. A response signal can be received. According to another mobile station paging method of the present invention, when a call is made to a mobile station from an exchange in a URA connection state, a paging signal from the exchange is sent to a URA paging signal from a serving base station control station. When the paging signal held by the drift base station control station is sent to the mobile station after the relocation of the mobile station is completed, the paging signal is sent to the mobile station. If the paging signal does not reach the mobile station due to a temporary poor radio wave condition, the paging signal is retransmitted from the exchange to the mobile station via the drift base station control station. The signal can be reliably delivered to the mobile station, and the switching station can reliably receive the paging response signal from the mobile station. According to still another mobile station paging method of the present invention, when there is a call from the exchange to the mobile station in the URA connection state, a paging signal from the exchange is sent to the URA paging from the serving base station control station. Carry on the signal and send it to the mobile station via the drift base station control station, hold it in the mobile station, and after the relocation of the mobile station, drift from the mobile station according to the paging signal held in the mobile station. Since the paging response signal is returned to the exchange via the base station control station, the paging signal from the exchange can be reliably delivered to the mobile station, and the exchange can reliably receive the paging response signal from the mobile station. be able to.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a mobile station paging method according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a mobile station paging method according to a second embodiment of the present invention.

FIG. 3 is a flowchart showing a mobile station paging method according to a third embodiment of the present invention.

FIG. 4 is a diagram for explaining the concept of a URA connection state.

FIG. 5 is a diagram for explaining a relationship between a cell connection state and a URA connection state.

FIG. 6 is a flowchart showing a conventional method of calling a mobile station in a URA connection state.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Switching station 101 CS domain 102 PS domain 103 Serving base station control station 104 Drift base station control station 105 Mobile station

Claims (7)

[Claims] When a mobile station calls a mobile station from a mobile station while the mobile station is in a URA connection state, the mobile station transmits a call from the CS domain of the mobile station to a serving base station control station in accordance with the location of the mobile station at the time of previous data transmission / reception. By sending a paging signal, the serving base station control station piggybacks the paging signal on the URA paging signal and transmits it to the drift base station control station, so that the drift base station control station holds the paging signal and The mobile station transmits a URA paging signal to the mobile station, and the mobile station transmits a cell update signal to the serving base station control station via the drift base station control station, thereby enabling the switching station to receive a PURA signal.
When the S domain performs relocation processing and shifts the mobile station from the control of the serving base station control station to the control of the drift base station control station, the drift base station control station sends the held paging signal to the mobile station. A method for calling a mobile station, characterized in that the mobile station returns a paging response signal to the exchange via a drift base station control station by transmitting. 2. When the paging signal transmitted from the drift base station control station does not reach the mobile station, the CS domain of the switching station retransmits the paging signal to the mobile station via the drift base station control station. 2. The mobile station calling method according to claim 1, wherein the mobile station returns a paging response signal to the exchange via a drift base station control station. 3. The system according to claim 1, wherein the CS domain of the switching center is configured to wait for a paging response signal from the mobile station to time out.
3. The method according to claim 2, wherein the paging signal is retransmitted. 4. The switching base station's CS domain knows the drift base station control station to which the paging signal should be transmitted by querying the switching station's PS domain for the location of the mobile station after relocation. The mobile station calling method according to claim 2 or 3. 5. When a mobile station calls a mobile station from a switching station when the mobile station is in a URA connection state, the mobile station transmits a call from the CS domain of the switching station to the serving base station control station according to the position of the mobile station at the time of previous data transmission / reception. A paging signal is transmitted, and the serving base station control station piggybacks the paging signal on the URA paging signal and transmits the paging signal to the mobile station via the drift base station control station. By transmitting an update signal to the serving base station control station via the drift base station control station, the PS domain of the exchange performs relocation processing, and moves the mobile station from the control of the serving base station control station to the drift base station. When transferring to the control of the control station, the mobile station changes the paging response signal according to the paging signal held by the mobile station to the drift base. Mobile station call wherein the returning to the switching station via a station control station. 6. The PS domain of the switching center,
6. The mobile station calling method according to claim 1, wherein a position of the mobile station at the time of previous data transmission / reception is known by inquiring of a domain. 7. The drift base station control station according to claim 1, wherein the drift base station control station returns the paging response signal to an exchange in an initial UE message from the mobile station. Mobile station calling method.