JP2877947B2 - Switching method for intra-station intra-station channel switching method and intra-station inter-station intra-station channel switching function in mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] Intra-system channel switching method between intra-station systems in a mobile communication system in which base stations of different radio systems coexist for one switching station, and intra-station channel switching used in such a mobile communication system Regarding an exchange having an inter-system intra-station channel switching function, it can enter the conventional inter-system inter-station channel switching process, activate the inter-system inter-station channel switching process, and actually realize inter-system intra-station channel switching. When the mobile terminal moves between base station areas having different wireless systems, the switching station starts an inter-system channel switching process, and once returns a signal addressed to the own switching station to the own station. Sends out to the trunk, takes it in to its own station via another return trunk paired with this return trunk, and executes inter-system channel switching processing. Sea urchin to configure.

[Industrial applications]

The present invention relates to an intra-station intra-station intra-station channel switching method and an inter-exchange station having an intra-station inter-station intra-station channel switching function in a mobile communication system in which base stations of different radio systems exist for one exchange.

In a car telephone exchange system, one exchange (1
In general, one station uses one radio system, but there is a request that one exchange controls two or more radio systems.

[Conventional technology]

Generally, in mobile communication, unlike a fixed telephone, a terminal has a channel switching function which is a special function because a terminal moves freely during a call.

As a method for such channel switching, conventionally,
Three types of intra-station channel switching, inter-station channel switching, and inter-system inter-station channel switching have been proposed.

(1) Regarding intra-office channel switching method In such intra-office channel switching method, as shown in FIG. 4, a plurality of areas controlled by one automobile telephone exchange (AMS) 101 are all the same wireless system, The intra-station channel switching method switches the intra-station channel when the mobile terminal 102 moves between areas of the same radio scheme in the same station.

(2) Inter-office channel switching method In such an inter-office channel switching method, as shown in FIG. 5, a plurality of areas controlled by each of the AMSs 101-1 and 101-2 are all the same. When the mobile terminal 102 moves between areas of the same wireless scheme between these stations, the mobile station 102 switches channels between these stations.

(3) Inter-system inter-station channel switching system In the inter-system inter-station channel switching system, as shown in FIG. 6, a plurality of areas controlled by the mobile telephone exchange (AMS) 101-1 and another area are controlled. Automotive Telephone Switching Office (AMS) 101-
Multiple areas controlled by 3 (diagonally shaded areas)
Are different radio systems, and when the mobile terminal 102 moves between areas of different radio systems between these stations,
Switching between channels between these stations is the inter-system channel switching system.

In FIGS. 4 to 6, reference numeral 103 denotes a mobile telephone exchange 1
01,101-1,101-2,101-3 wireless base station (MB
S).

[Problems to be solved by the invention]

However, conventionally, there has not been found any one having a channel switching function that crosses areas of different wireless schemes within the same station (inter-system intra-station channel switching scheme).

Therefore, it is very costly to newly develop such an inter-system intra-station channel switching system.

The present invention was conceived under such circumstances, and entered the conventional inter-system inter-station channel switching process,
In processing, start the process of switching channels between stations between systems,
In fact, it is an object of the present invention to provide an intra-station intra-station channel switching method and an exchange having an intra-station inter-station intra-channel switching function in a mobile communication system capable of realizing inter-station intra-station channel switching.

[Means for solving the problem]

 FIG. 1 is a block diagram showing the principle of the present invention.

In FIG. 1, reference numeral 1 denotes a mobile telephone exchange, and this mobile telephone exchange 1 places areas E1 and E2 of different radio systems under its control via radio base stations 3-1 and 3-2. I have. The mobile terminal 2 can freely move between these areas E1 and E2.

The mobile telephone exchange 1 has a two-way trunk 4
-1, 4-2, return trunks 5-1 and 5-2, outgoing trunks 6, and channel switching trunks 7 are provided, and the bidirectional trunks 4-1 and 4-2 are connected to the radio base stations 3-1 and 3- 2 and the return trunks 5-1 and 5-2 are connected to each other in the own station (the return trunks 5-1 and 5-2 form a pair that outputs a signal to one side when the signal is input to the other side). Is)
The outgoing trunk 6 is connected to a subscriber terminal 9 via a fixed network exchange 8.

The channel switching trunk 7 switches the channel so as to be an optimum channel depending on the position of the mobile terminal 2.

That is, when the mobile terminal 2 communicates via the wireless base station 3-1 employing the first wireless system, the mobile telephone exchange 1 performs an exchange process corresponding to the first wireless system, 2 switches to communication via the wireless base station 3-2 employing the second wireless system different from the first wireless system, the channel is connected to one of the paired return trunks 5-1 and 5-2. A first processing means for switching (portion A above the dotted line in FIG. 1) and a second processing means for the signal transmitted through the pair of return trunks 5-1 and 5-2
Second processing means (in FIG. 1, a dotted line in FIG. 1) for performing a switching process corresponding to the wireless system of FIG. 1 and allowing the mobile terminal 2 to communicate via the wireless base station 3-2 adopting the second wireless system. And a lower part B).

(Operation)

In the above-mentioned intra-station intra-station channel switching method in the mobile communication system of the present invention, for example, it is assumed that a call is made between the subscriber terminal 9 and the mobile terminal 2 in the area E1. Other areas with different
When the mobile terminal 2 moves to E2, in this station 1,
The inter-method channel switching process is started, the channel switching trunk 7 is switched, and a signal addressed to the own station is once sent to the returning trunk 5-1 of the own station.
Then, it is taken into its own station via another return trunk 5-2 that forms a pair, and the inter-system channel switching processing is executed. As a result, the signal addressed to the own station is transmitted to the bidirectional trunk 4- for the area E2.
2. The mobile terminal 2 that has entered the area E2 is accessed via the wireless base station 3-2.

Further, in the exchange 1 having the intra-station intra-station channel switching function of the present invention, when the mobile terminal 2 communicates via the radio base station 3-1 employing the first radio system,
The first processing means performs an exchange process corresponding to the first wireless system.

When the mobile terminal 2 switches to communication via the wireless base station 3-2 that employs a second wireless system different from the first wireless system, the first processing unit uses the pair of return trunks. One of 5-1 and 5-2 (return trunk 5
-1), channel switching is performed, and the second processing means performs switching processing corresponding to the second wireless system on the signals transmitted through the pair of return trunks 5-1 and 5-2. Then, the mobile terminal 2 performs communication via the wireless base station 3-2 employing the second wireless system.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention. In FIG. 2, 1-1 and 1-2 are mobile telephone exchanges as mobile telephone exchanges, and the mobile telephone exchange 1-1 is a mobile telephone exchange. And areas E1 and E2 of different wireless systems are assigned to the wireless base stations 3-11 and 3-1.
2 and under its control, the mobile telephone exchange 1-2
Is the area E3, E4 of the same wireless system, the wireless base station 3-21,
It is under its control via 3-22.

For example, a D60 type exchange is used as the mobile telephone exchange 1-1, and a D10 type exchange is used as the automobile telephone exchange 1-2, for example.

The radio system (the first radio system) in the area E1 is the current radio system (current car, new ship, airplane telephone), and the radio system in the area E2 (the second radio system) is the large-capacity radio system (the large-capacity radio system). In the case of a car phone, the wireless system in the areas E3 and E4 is the above-mentioned current wireless system.

Further, the mobile terminal 2 can freely move between these areas E1 to E4.

By the way, the mobile telephone exchange 1-1 has a mobile telephone two-way trunk (MBWT) 4-11, 4-12, a local bidirectional trunk (IOBWT) 5-1, 5-2, as a return trunk.
Outgoing trunk (OGT) 6, Channel switching trunk (CXT) 7-
11, a channel switching memory (CXM) 7-12, and a common line two-way trunk (CSBWT) 10-11 are provided, and a car telephone two-way trunk 4-11, 4-12 is provided for the radio base station 3-11, 3-
12 and the two-way trunks 5-1 and 5-2 in the own station are mutually connected in the own station (the two-way trunks 5-1 and 5-2 in the own station output to one another when a signal is input to the other). The outgoing trunk 6 is connected to a subscriber terminal 9 via a fixed network exchange 8.

The channel switching trunk 7-11 switches according to the position of the mobile terminal 2 so that an optimal channel is obtained, and the channel switching memory 7-12 stores channel switching information.

The common line two-way trunk 10-11 is an interface for a communication line between the offices. In this example, the common line two-way trunk 10-11 is connected to the common line two-way trunk 10-21 of the mobile telephone exchange 1-2.

Further, the mobile telephone exchange 1-2 has a mobile telephone bidirectional trunk (MBWT) 4-21, 4-22, a channel switching trunk (CXT) 7-21, and a channel switching memory (CXM) 7-2.
2. A common line two-way trunk (CSBWT) 10-21 is provided, and the mobile telephone two-way trunks 4-21 and 4-22 are connected to the radio base stations 3-21 and 3-22.

The channel switching trunk 7-21 switches the channel according to the position of the mobile terminal 2 so that an optimal channel is obtained, and the channel switching memory 7-22 stores channel switching information.

The common line two-way trunk 10-21 is an interface for a communication line between offices. In this example, the common line two-way trunk 10-21 is connected to the common line two-way trunk 10-11 of the mobile telephone exchange 1-1.

The mobile telephone exchanges 1-1 and 1-2 have main control units (CC) 11-1 and 11-2 and main storage units (MM) 12-1 and 12-2 for controlling them, respectively. ing.

According to the above-described configuration, for example, if a call is made between the subscriber terminal 9 and the mobile terminal 2 in the area E1, and the mobile terminal 2 moves to another area E2 having a different wireless system in the same station, Starts the inter-system inter-station channel switching processing in the station 1-1, switches the channel switching trunk 7-11, and once sends out a signal addressed to the own station to the own station bidirectional trunk 5-1. Trunk 5
-1 is fetched into the local station via another local bidirectional trunk 5-2, that is, after capturing the local bidirectional trunk 5-1 on the outgoing line of the mobile telephone exchange 1-1, it is used for inter-office use. By editing the signal, linking it to the reception queue instead of the transmission queue, and taking it into the own station via the other intra-station bidirectional trunk 5-2 paired with the intra-station bidirectional trunk 5-1, the inter-station interface is obtained. After processing,
In the station 1-1, an inter-system inter-station channel switching process is executed. As a result, the signal addressed to the own station accesses the mobile terminal 2 entering the area E2 via the two-way car telephone trunk 4-12 and the radio base station 3-12 for the area E2.

Thus, for one mobile telephone exchange 1-1,
The states are separated (see the dotted line in FIG. 2). If the switching destination is different, the same station is regarded as another station, and the part A above the dotted line in FIG. Terminal 2 is the first
When communication is performed via the wireless base station 3-11 employing the wireless system (the wireless system of the area E1), an exchange process corresponding to the first wireless system is performed using a current wireless exchange program P1, which will be described later. When the mobile terminal 2 switches to communication via the wireless base station 3-12 employing the second wireless system (wireless system in the area E2) different from the first wireless system, the mobile station 2 performs a bidirectional trunk 5-1 in its own station. , 5-2 (two-way trunk 5-1 in the local station) for switching channels, and means for performing such processing is referred to as first processing means. ]
And the lower part B (the lower part B describes the exchange processing corresponding to the second wireless system with respect to the signal transmitted through the paired local bidirectional trunks 5-1 and 5-2. The mobile terminal 2 communicates via the radio base station 3-12 adopting the second radio system by using the large-capacity radio exchange program P2. Is referred to as second processing means.) And the inter-station processing is started independently, and the two-way trunk 5-
By using 1,5-2, the call line is looped back, and the inter-station signal is connected to the reception queue instead of the transmission queue. Channel switching can be realized.

Furthermore, when the mobile terminal 2 moves further and enters the area E4, the conventional inter-system channel switching method is used. That is, the common line bidirectional trunks 10-11 and 10-2
The mobile terminal 2 accesses the mobile telephone exchange 1-2 via the mobile telephone exchange 1 and enters the area E3 via the mobile telephone bidirectional trunk 4-21 for the area E3 and the radio base station 3-21.
To access.

FIG. 3 is a software conceptual diagram showing the relation between programs of the mobile telephone exchange 1-1. That is, the current wireless exchange program P for area E1
1. The large-capacity wireless switching program P2 for the area E2 is linked to the common channel signal control program P3 and the local bidirectional trunk control program P4.

At present, the development of a new wireless system (digital wireless system) has begun, but if this system is applied, three or more wireless systems including the current wireless system, large-capacity wireless system, and digital wireless system will be applied in the future. These can be integrated and handled in the same station.

〔The invention's effect〕

As described in detail above, according to the present invention, it is possible to enter the conventional inter-system inter-station channel switching process, activate the inter-system channel switching process, and actually realize inter-system intra-station channel switching. This eliminates the need for new development for intra-station channel switching between intra-station systems, which can contribute to cost reductions and accommodate wireless systems that are currently operating individually in one exchange. This is advantageous in that the same station can be used in the future, and that a plurality of wireless systems can be handled by the same station in the future.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle of the present invention, FIG. 2 is a block diagram showing one embodiment of the present invention, FIG. 3 is a conceptual diagram of software of one embodiment of the present invention, and FIG. FIG. 5 is a diagram for explaining the inter-station channel switching system, and FIG. 6 is a diagram for explaining the inter-system channel switching system. In the figure, 1 is a mobile telephone exchange, 1-1 and 1-2 are mobile telephone exchanges (mobile telephone exchanges), 2 is a mobile terminal, 3-1,3-2,3-11,3-12, 3-21, 3-22 are radio base stations, 4-1 and 4-2 are two-way trunks, 4-11, 4-12, 4-21 and 4-22 are car phone two-way trunks, 5-1 and 5- 2 is a bidirectional trunk in the local station (return trunk), 6 is an outgoing trunk, 7,7-11,7-21 is a channel switching trunk, 7-12,7-22 is a channel switching memory, 8 is a fixed network switching office, 9 is a subscriber terminal, 10-11 and 10-21 are bidirectional trunks for common lines, 11-1 and 11-2 are main control units, 12-1 and 12-2 are main storage units, 101,101-1,101-2,101-3. Is a mobile telephone exchange, 102 is a mobile terminal, and 103 is a radio base station.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirokazu Matsuura 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Teruki Niwa 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone (72) Inventor Yuki Yasuda 5-7-1 Shiba, Minato-ku, Tokyo NEC Corporation (58) Fields investigated (Int. Cl. ⁶ , DB name) H04B 7/26 H04Q 7/00 -7/38

Claims (2)

(57) [Claims] In a mobile communication system in which base stations of different radio systems coexist for one switching center, if the mobile terminal moves between base station areas of different radio systems, the switching center will Start the channel switching process,
Mobile communication characterized in that a signal addressed to the local exchange is once sent to the return trunk of the local exchange, taken into the local exchange via another return trunk paired with the return trunk, and an inter-system channel switching process is executed. An intra-station channel switching method between intra-station systems in a system. 2. An exchange connected to a plurality of base stations of different radio systems, comprising a pair of return trunks connected to each other and outputting a signal to one of them when the signal is inputted to the other, and a mobile terminal comprising: When communication is performed via a base station that employs the wireless communication method, the mobile terminal performs an exchange process corresponding to the first wireless communication method, and the mobile terminal uses a second wireless communication method different from the first wireless communication method. When switching to communication via the adopted base station, first processing means for performing channel switching to one of the pair of return trunks, and a signal transmitted through the pair of return trunks, Second processing means for performing an exchange process corresponding to the second wireless system and allowing the mobile terminal to communicate via a base station adopting the second wireless system. Characterized in that Switching center having a station channel switching function between station system.