KR20010015245A - Method of selecting and setting service option from multi service option in digital mobile communication system - Google Patents

Abstract

PURPOSE: To eliminate the need for performing the negotiation of service options every time of call connection, to shorten call connection time and to suppress the processing burdens of a switchboard. CONSTITUTION: Plural radio base stations 4 and home location register devices 5 are housed in a CDMA mobile communication network 1 and a mobile terminal 6 performs telephone conversation/communication through a radio section with the radio base station 4. The service option OS selected from plural voice compression rates most preferentially applied beforehand to subscriber data for each mobile terminal 6 in the visitor location register 3a of the switchboard 3 is fetched from the home location register device 5 and set. The switchboard 3 performs the first call connection with the mobile terminal 6 by the service option OS and the service option OS supported by the mobile terminal 6 is confirmed by service negotiation and stored at the time of the call connection. The stored service option OS is specified to the mobile terminal 6 at the time of the call connection thereafter.

Description

Method of selecting and setting service option from multi service option in digital mobile communication system}

The present invention relates to a call connection performed between a switching center and a mobile terminal according to a multiservice option in a CDMA type digital cellular mobile telephone system (TIA / IS-95A standard). In particular, the present invention relates to one of the multi-service options in a digital mobile communication system in order to initially specify a service option (voice compression rate) through the first call connection when a call connection occurs after performing a second call connection. To select and set service options.

Prior art

In the recent CDMA type digital cellular mobile telephone system (TIA / IS-95A standard), a multi-service option has been introduced. For example, in the early stages, the speech compression rate is only 8 kbps / Q-CELP. Each exchange only supports this voice compression technology. Recently, however, voice compression rates with improved sound quality, such as 13 kbps / Q-CELP or 8 kbps / EVRC, have been developed. That is, a plurality of speech compression rates are defined as service options.

In the CDMA type digital cellular mobile telephone network, on the exchange side, it is necessary that the exchange side supports any one of all voice compression rates. In addition, the switching center needs to specify a service option corresponding to the voice compression ratio supported by the mobile terminal. However, in the current form of transmission, for example, the home location register (HLR) or visitor location register (VLR) that manages subscriber data does not manage service options corresponding to the voice compression rate supported by the mobile terminal.

For this reason, when making a call connection, the switching center designates a service option set by the switching station at the highest priority. If the mobile terminal is able to support the service option designated by the switching center at the highest priority, the switching center redirects the service option to the mobile terminal. As a result, the switching center negotiates a service option with the mobile terminal as to whether the switching station can establish a call state with the mobile terminal by the service option.

As a procedure for this negotiation, the specification procedure, "EIA / IS-95A + TSB-74, Section 7.6.4.1.2 / Service Configuration and Negotiation" and "ARIB / STD-T53, Section 7.6.4.1.2 / Service Configuration and Negotiation "is known.

As a conventional example of the CDMA-type digital cellular mobile telephone network described above, "non-telephone call connection system" of JP-A-10-32645, "wireless packet voice reception call apparatus" of JP-A-10-304455, and JP-2658938 Digital mobile object data communication exchange systems and digital mobile object communication exchanges and digital mobile object data communication protocol converters provided therein and "Digital mobile data communication systems" of JP-2758861 are known. However, in any of these inventions, each current switching center does not process a service option corresponding to the voice compression rate that each mobile terminal supports as subscriber data by means of a home location register (HLR) or a visitor location register (VLR).

In this way, in each of the above conventional examples, each time the call connection is made, it is necessary to execute negotiations with the mobile terminal that cannot support the service option specified by the exchange. That is, in each of the above conventional examples, it is unnecessary for the switching station to repeatedly perform negotiations with the same mobile terminal every time a call connection is made. As a result, there is a disadvantage in that the length of the call connection time becomes long, and thus the processing load on the switching center increases.

1 is a block diagram showing a method for selecting and setting a service option from a multi-service option in a digital mobile communication system according to the present invention, and the configuration of an embodiment of the system.

2 is a diagram showing the contents of a typical subscriber data of an embodiment of the present invention, (a) shows subscriber data of a home location register device, and (b) shows subscriber data of a typical visitor location register. .

3 is a diagram showing the configuration of subscriber data in a visitor location register in one embodiment of the invention;

4 is a sequence diagram illustrating a processing sequence in which an operation is performed according to an embodiment at the time of reception of a mobile terminal, (a) is a diagram illustrating a processing sequence in which a receiving connection including service option negotiation is performed; (b) shows a processing sequence in which a receive connection is performed that does not include service option negotiation.

5 is a flowchart illustrating a processing sequence in which an operation is performed according to an embodiment at the time of reception of a mobile terminal.

6 is a sequence diagram illustrating a processing sequence in which an operation is performed according to an embodiment at the time of transmission of a mobile terminal, (a) illustrates a processing sequence in which a transmission connection including service negotiation is performed, and (b) Shows a processing sequence in which a transmit connection including service negotiation is performed.

7 is a flowchart illustrating a processing sequence in which an operation is performed according to an embodiment at the time of transmission of a mobile terminal.

* Explanation of symbols for the main parts of the drawings

1: mobile communication network 2, 3: switching center

4: wireless base station 5: HLR

6: mobile terminal

SUMMARY OF THE INVENTION The present invention has been made to solve the above shortcomings, and it is an object of the present invention to provide a method and system for selecting and setting a service option from a multi-service option in a digital mobile communication system. When a first call connection occurs after performing the connection, the exchange station initially designates a service option confirmed by the switching center according to the result of negotiation performed between the switching station and the mobile terminal when the switching station performs the first call connection. Can be. According to the present invention, when the switching center performs a second call connection and thereafter a call connection occurs, according to the result of the negotiation performed between the switching station and the mobile terminal when the switching station performs the first call connection. The service option confirmed by the switching center may be initially designated. Therefore, there is no need to negotiate the service option every time a call connection is made. Therefore, the time length of the call connection can be shortened, and thus the processing load on the switching center can be suppressed.

In order to achieve the above object, according to the present invention, there is provided a method for selecting and setting one service option of a multi-service option in a digital mobile communication system for setting a voice compression rate that a mobile terminal can support. A first processing step of setting service options to which the switching center is applied with the highest priority in advance to subscriber data for each mobile terminal stored in the visitor location register of the switching center; A second processing step in which the switching center performs a first call connection to the mobile terminal by the service option set in the first processing step, wherein the switching station may support the mobile terminal at the time of the first call connection; Identifying a service option, storing the service option, wherein the switching center includes a second processing step for specifying the service option stored at the subsequent call connection by the switching center.

The first processing step includes: setting a service option memory area for subscriber data for each mobile terminal stored in the visitor location register of the switching center; The switching center has a process of setting service options applied to the service option memory area in advance at the highest priority.

The second processing step may further include storing, in the service option memory area, the service option confirmed by the switching center by service negotiation whether the first call connection with the mobile terminal was performed by reloading the service option into the service option memory area. Process, and when the switching center performs a subsequent call connection with the mobile terminal, the switching center performs the call connection by initially specifying a stored service option.

In a digital mobile communication system, a switching center provided with a visitor location register storing a service option selected from a plurality of voice compression rates each mobile terminal can support accommodates a plurality of wireless base stations. The system also includes a communication network connected to a home location register, which is a database where subscriber data is stored. The digital mobile communication system further comprises: first processing means for setting a service option that the switching center applies to a subscriber data for each mobile terminal stored in the visitor location register of the switching center in advance at the highest priority; Second processing means for performing a first call connection to the mobile terminal by a service option set in the first processing means, wherein, in the first call connection, the switching station is capable of supporting the mobile terminal; A service option is identified, the service option is stored, and the switching center is provided with second processing means for designating this service option which the switching center stores at a subsequent call connection.

In the first processing means, a service option memory area is set for each mobile terminal in the subscriber data stored in the visitor location register of the switching station, and a service option set in advance in the service option memory area by the switching station in the highest priority is set. do.

In the second processing means, after the setting of the service option performed by the first processing means, the switching center may perform the first call connection with the mobile terminal by reloading the service option in the service option memory area. At that time, the service options confirmed by the exchange by service negotiation are stored. In the second processing means, the switching station specifies the service option when the switching station performs a subsequent call connection with the mobile terminal.

Further, a procedure of storing the service option selected from the plurality of voice compression rates by the first processing means is as follows. First, a service option selected from a plurality of speech compression rates arranged at the priority determined by the switching center is initially designated. Secondly, the mobile station receives a page signal storing this specified service option. If the mobile terminal is unable to support the service option informed by the page signal, the mobile terminal and the switching center between the service option that the mobile station can support and one of the plurality of service options that the switching station has The service request signal and the service response signal are transmitted / received until matching is performed. Thirdly, the matched service option is reloaded and stored in the service option memory area for each subscriber data in the visitor location register.

Further, when the matching is made between a service option that the mobile terminal can support and a service option of a plurality of service options that the switching station has, the mobile terminal and the switching center are between them. The service connection signal and the service connection completion signal are transmitted / received. Accordingly, the system is arranged to be able to set the state of the call at a voice compression rate corresponding to the service option for which the matching has been made.

When the service option that the mobile terminal can support does not match any of the plurality of service options possessed by the switching center, the system is arranged such that the switching center disconnects call connection processing.

In addition, the system is arranged as follows. In the subscriber data of the visitor location register, the mobile terminal can support the electronic serial number, mobile terminal identification number, supplementary service, and when the switching center performs a call connection for each of the mobile terminals, the switching station A service option corresponding to this preferentially designated voice compression rate is provided. The switching center takes information of these items from the home position register device and references the information of the items. The switching center performs a call connection to the mobile terminal.

In addition, the system is arranged as follows. The subscriber data of the home location register device has an electronic serial number, a mobile terminal identification number, a supplementary service, a subscriber's name, and a subscriber's address. With reference to the information of these items, the switching center makes a call connection to the mobile terminal.

A method of selecting and setting one service option from a multi-service option in a digital mobile communication system, and in the apparatus having the above configuration, the switching center has a visitor location register having subscriber data for each mobile terminal. The switching center sets in advance the service option applied by the switching center at the highest priority in the subscriber data. Thus, the switching center performs the first call connection with the mobile terminal. In this call connection, the switching center identifies a service option that the mobile terminal can support, and the switching center stores this service option. The switching center specifies this stored service option for the mobile terminal when performing a subsequent call connection.

In other words, according to the present invention, the switching center is to be confirmed by the switching center according to the result of the negotiation performed between the switching center and the mobile terminal when the switching center performs the first call connection, and then perform the subsequent call connection. In this case, a service option that the mobile terminal can support may be initially designated. As a result, there is no need to negotiate the service option every time a call connection is made. Therefore, the time length of the call connection can be shortened, and thus the processing load on the switching center can be alleviated.

Description of the Preferred Embodiments

Next, an embodiment of a digital mobile communication system according to the present invention and a method for selecting and setting one service option from multiple service options in a system for the system will be described in detail.

As illustrated in Fig. 1, the digital mobile communication system of the present invention includes an ISDN / PSTN which includes a mobile communication network 1, accommodates an exchange station and a cell base station, and is capable of performing communication between mobiles. Switching stations 2 and 3 performing switching access in the mobile communication network 1, respectively, and radios respectively accommodated in the switching center among the switching stations 3 to perform wireless channel access in the corresponding service area (wireless zone). A home position register (HLR) device 5 which is provided in a base station (cell base station) 4, a central control station accommodated in the mobile communication network 1, and is a database storing subscriber data; In the service area (wireless zone) of the radio base station 4, there are a plurality of mobile terminals 6 each performing a call, data transmission, etc. by radio channel connection.

It should be noted that only a portion of the wireless base station 4 is shown, although only a plurality of wireless base stations 4 are accommodated in each of the switching centers 2, 3. In most cases, the switching centers 2 and 3 are provided as a switch board provided with a mobile communication control station which accommodates a plurality of wireless base stations 4. That is, the switching centers 2 and 3 are provided as switching stations connected to this mobile communication control station. However, only the switching station is shown in FIG. In the following description, the switching center explains that the mobile terminal 6 performs call processing by the radio zone of the radio base station 4.

The switching centers 2, 3 provide visitor location registers (VLR) 2a, 3a, respectively. Each switching center 2,3 also provides a memory device, not shown. Each of these visitor location registers (VLR) 2a, 3a is a database in which memory areas are allocated to the memory device.

Next, the operation of the system configured above will be described. First, the operation of each part will be described. 2 (a) and 2 (b) show the contents of normal subscriber data. FIG. 2A illustrates subscriber data of the home location register (HLR) device 5, and FIG. 2B illustrates subscriber data of a typical visitor location register (VLR) 2a and 2b. It is. Fig. 3 shows the contents of the subscriber data in the visitor location register (VLR) 2a, 3a corresponding to the present invention.

In Fig. 1, subscriber data of the mobile terminal 6 referenced by the switching center 3 when performing a call connection is stored in advance in the home position register (HLR) device 5. The subscriber data taken by the switching center 3 from the home position register device 5 is temporarily stored in the visitor position registers (VLRs) 2a and 3a installed in the switching centers 2 and 3.

The subscriber data referenced by the switching centers 2 and 3 when call connection is performed during normal operation is managed by the home position register (HLR) device 5 singularly. On the other hand, the switching centers 2 and 3 are necessary for performing call connection processing at high speed. On the other hand, the position registration sequence signal is transmitted to the mobile terminal 6 at the time of the mobility assisted handover process (CDMA / soft hand process). For high speed performance, the switching center 2,3 takes subscriber data of the mobile terminal 6 from the home location register (HLR) device 5 and sends it to the visitor location register (VLR) 2a, 3a. Store the subscriber data.

The switching centers 2, 3 provide visitor location registers (VLR) 2a, 3a, respectively. Each switching center 2,3 also provides a memory device, not shown. Each visitor location register (VLR) 2a, 3a is a database in which memory areas are allocated to the memory device.

In Fig. 2A, subscriber data of the plurality of mobile terminals 6 is stored in advance in the home position register (HLR) device 5. The mobile terminal 6 moves to the service area of the radio base station 4 which the switching centers 2 and 3 house in it. The switching centers 2 and 3 make a channel connection with the mobile terminal 6 in the radio zone. In FIG. 2B, visitor location registers (VLRs) 2a and 3a of the switching center 2 are subscriber data required for a call connection from a home location register (HLR) device 5 to the mobile terminal 6. Take a bay. The visitor location registers (VLRs) 2a, 3a temporarily store this subscriber data.

As illustrated in FIG. 2B, subscriber data of a plurality of mobile terminals 6 stored in a home location register (HLR) device 5 may include ESN: Electronic Serial Number, MIN: Mobile Terminal Identification, and SS: Supplementary. It contains information with Service, NAME: Name of Subscriber and ADDR: Address of Subscriber. With reference to the information (subscriber data) of these items, the switching centers 2 and 3 perform a call connection with the corresponding one of the plurality of mobile terminals 6.

As illustrated in Fig. 3, the subscriber data stored in the visitor location register (VLR) 2a, 3a includes ESN: Electronic Serial Number, MIN corresponding to the present invention; There is a memory area for Mobile Terminal Identification Number (ID), and SS: Supplementary and SO: Service Option.

The information (subscriber data) in the visitor location register (VLR) 2a, 3b of Fig. 3 is referred to by the switching center 2,3. The memory area for storing a service option (SO) is for storing a service option which the mobile terminal 6 relies on as a service option that can be supported by referring to subscriber data. This service option corresponds to the voice compression rate preferentially designated by the switching center 2.

In the example of FIG. 1, the switching center 3 initially performs a call connection with the mobile terminal 6 in the service area of the wireless base station 4 accommodated inside the switching center 3. At this time, a service option SO corresponding to a voice compression rate selected from a plurality of predetermined voice compression rates is designated as a service option applied by the switching center at the highest priority. If the mobile terminal 6 cannot support this service option SO (voice compression rate), the service option corresponding to the voice compression rate that the mobile terminal 6 can support is negotiated through the service option. It is confirmed. After this confirmation, the service option is changed to a service option corresponding to the voice compression rate that the mobile terminal 6 can support.

The switching center 3 selects the service option SO (the number of voice compression rate / service option SOs that can be selected from a plurality of voice compression rates and can be supported by the mobile terminal 6) after the service option negotiation. The visitor location register (VLR) 3a. Subsequently, when the switching center 3 performs a call connection to the mobile terminal 6, the switching center 3 corresponds to a service corresponding to the speech compression rate determined as the highest priority applied by the switching station 3 in advance. Except for the option, the service option SO (voice compression rate) stored by the visitor location register (VLR) 3a is specified for the mobile terminal 6. That is, through the service option negotiation performed when the switching center 3 performs the first call connection, the service option is changed to the service option SO corresponding to the voice compression rate that the mobile terminal 6 can support at present. . Therefore, the service option is set to this service option SO.

Therefore, even for the mobile terminal 6 which cannot support the voice compression rate designated by the switching station 3 as the highest priority, at the time of the second and subsequent connection, the switching station 3 is provided with the service option (SO). You do not need to negotiate). As a result, the time length of the call connection can be shortened, thereby reducing the processing load on the switching center.

4 is a sequence diagram showing a processing procedure of a call connection performed between the switching center 3 and the mobile terminal 6 when the mobile terminal 6 performs reception. 4A illustrates a processing sequence in which a receive connection including service option negotiation is performed, and FIG. 4B illustrates a processing sequence in which a receive connection including service option negotiation is performed. have. 5 is a flowchart showing a processing sequence in which the call connection operation of the switching centers 2 and 3 is performed when the mobile terminal 6 performs reception.

In Fig. 4 (b) and routine A of Fig. 5, when a receive connection is performed, the switching centers 2 and 3 have visitor location registers (VLRs) 2a and 3a for the plurality of mobile terminals 6 to be called. See subscriber data. By this reference, the switching centers 2 and 3 transmit the page signal T1 including the electronic serial number (ESN) or the mobile terminal identification number (ID) MIN (step S1). This page signal T is appended with a service option number which indicates which voice compression rate the switching center 3 uses.

An example of the correspondence between service option (SO) numbers and voice compression rates is shown in Table 1.

Table 1

Service Option NO. Speech compression rate SO1 8 kbps / Q-CELP SO2 13 kbps / Q-CELP SO3 8 kbps / EVRC

The priority of the voice compression rate (service option (SO)) applied in advance by the switching centers (2, 3) is SO1 (8kbps /) as the oath of the voice compression rate which is generally superior in the resultant sound quality and the efficiency of the resultant wireless call. Q-CELP), SO2 (13 kbps / Q-CELP), and SO3 (8 kbps / EVRC). Thus, the SO1 (8 kbps / Q-CELP) (Table 1) is loaded as a default value into the service option SO of the visitor location register (VLR) 2a, 3a.

When reception is made by the mobile terminal 6, subscriber data of the mobile terminal 6 stored in the visitor position register (VLR) 3a is referred to by the switching center 3 (step 32). Thereafter, the page signal including the electronic serial number (ESN) or mobile terminal identification number (ID) MIN and service option number is transmitted to the mobile terminal 6 (step S3). When the switching center 3 performs the first call connection, since the content of the service option SO is SO1 (8 kbps / Q-CELP) of Table 1, which is the default value, the switching center 3 is configured as shown in Table 1 of FIG. Send SO1 (8 kbps / Q-CELP).

In response, the mobile terminal 6 transmits a page response signal T2 again. If the mobile terminal 6 supports SO1 (8 kbps / Q-CELP) in Table 1, the mobile terminal 6 adds the service option specified by the page signal T1 to the switching center 3. The page response signal T2 is transmitted again.

As a result of the comparison, if the two service options SO coincide (step S6: Yes), the switching center 3 has the mobile terminal 6 as shown in Figs. 4A, 5B and 5; Transmits a voice channel assignment signal T3. Thereafter, the switching center 3 transmits a service access signal T6 to the mobile terminal 6 without performing service option negotiation. On the other hand, the mobile terminal 6 transmits a service connection completion signal T7 to the switching center 3. Thereafter, the state of the call is set to the voice compression rate corresponding to SO1 (8 kbps / Q-CELP) in Table 1 (steps S7, S8, S9).

Next, the case where the mobile terminal 6 does not support SO1 (8 kbps / Q-CELP) will be described.

As shown in Figs. 4A and 5B, if no match is obtained in the comparison made in step S6 (No), the mobile terminal 6 sets the page response signal T2 as a default service option. Add SO1 (8kbps / Q-CELP). Here, the switching center 3 recognizes that it has received a different service option than that specified by the page signal T1. Thereafter, preferentially applied SO2 (13 kbps / Q-CELP) is specified, and the switching center 3 transmits a service request signal T4 (step S10).

When the mobile terminal 6 supports SO2 (13 kbps / Q-CELP), the mobile station 6 transmits a service response signal T5 including SO2 (13 kbps / Q-CELP). Transfer to (3). The switching center 3 recognizes that the service option SO2 is the same as that designated by the switching unit 3 as the service request signal T5.

Next, as in the case of routine A, the transmission / reception of the service connection signal T6 and the service connection completion signal S7 is performed between the mobile terminal and the switching center. Thereafter, the state of the call is set through the medium of the voice compression rate corresponding to the SO2 (12 kbps / Q-CELP).

In addition, the service option (SO) memory area for storing subscriber data stored in the visitor location register (VLR) 3a is reloaded from SO3 (8 kbps / EVRC) to SO2 (13 kbps / Q-CELP) ( Step S11, S12, S13).

Further, in step S12 of routine B, if no match is obtained, i.e., when the mobile terminal 6 does not support SO2 (13 kbps / Q-CELP), the mobile terminal 6 is connected to FIG. As shown in (a) and routine C of FIG. 5, the SO1 (8 kbps / Q-CELP) is transmitted again in the service response signal T5. Therefore, the switching center 3 determines whether this service option SO1 is different from the service option designated by the switching station 3 as the service request signal T4. Thereafter, the switching center 3 designates SO1 (8 kbps / Q-CELP) preferentially applied by the switching center 3 and transmits the service request signal T4 again.

If SO1 (8 kbps / Q-CELP) is supported by the mobile terminal 6, this SO1 (8 kbps / Q-CELP) is sent back to the switching center as a service response signal T5. For this reason, the service option SO1 recognizes that it is the same as that designated by the switching center by the service request signal T4. Thereafter, as in the case of the routine A, transmission / reception of the service connection signal T6 and the service connection completion signal T7 is performed between the mobile terminal and the switching center. Thereby, the state of the call is established through mediation of the voice compression rate corresponding to SO1 (8 kbps / Q-CELP).

Also, when the mobile terminal 6 does not support SO1 (8 kbps / Q-CELP), the mobile terminal 6 does not transmit SO1 (8 kbps / Q-CELP) again as a service response signal T5. Do not. Therefore, a match is not obtained between the switching center and the mobile terminal by any one of the service options corresponding to the voice compression ratios indicated by SO1 to SO3. That is, the switching center determines whether the mobile terminal supports a service option other than the service option corresponding to the voice compression rates represented by SO1 to SO3. As a result, the switching center disconnects the current call connection process (step S18).

In this way, in the subsequent receiving connection to the mobile terminal 6, when the switching center 3 transmits the page signal T1, the switching center 3 is in the visitor location register VLR 3a. A service option SO (SO1 to SO3) previously stored in a service option (SO) memory area is added to the page signal T1, which is supported by the corresponding mobile terminal 6 and thus exchange offices. It has already been reloaded upon previous call connection with this preferentially specified service option (SO) (SO1 to SO3).

As a result, the service option SO sent back to the page response signal T2 needs to match the service option SO specified by the switching center in advance by the page signal T1. Thus, as in the case of the routine A of FIG. 5, in any one of subsequent call connections, between the mobile terminal and the switching center via transmission / reception of only the service connection signal T6 and the service connection completion signal T7. In the state of the call is set.

Next, the case where the initial call connection is a transmission made from the mobile terminal will be described.

6 (a) and 6 (b) are sequence diagrams showing a processing sequence in which an operation is performed at the time of transmission performed from the mobile terminal 6. FIG. 6A illustrates a processing sequence in which a transmission connection including service negotiation is performed. In FIG. 6B, a processing sequence in which a transmission connection including service negotiation is performed is illustrated. . 7 is a flowchart showing a processing sequence in which the transmission connection operation of the switching center 2 is performed.

In the routines A of Figs. 6A, 7B and 7, in the case of a transmission connection made from the mobile terminal 6 (step 21), an initial signal T2a is transmitted from the mobile terminal 6 to the switching station. Is transferred to (3) (step 22). To this initial signal T2a, one of the service options SO (SO1 to SO3) set in the mobile terminal 6 is added.

The voice channel is established through the transmission of the call allocation signal T3. Thereafter, the corresponding service option S01, S02, or S03 may be matched with the service option SO memory area of the visitor location register VLR 3a. When such a match occurs, transmission / reception of a service connection signal and a service connection completion signal T7 is performed between the mobile terminal and the switching center. Subsequently, the switching center 3 establishes a call connection of the call (steps S23, S24, S25, S26, S27, S28).

In Fig. 6A and routines B and C, when the service option SO is different as in the case of the reception connection (step S25: No), the switching center 3 is a priority determined by the switching station 3; The service option (SO) is designated according to the rank. Then, between the mobile terminal and the switching center, the transmission / reception of the service request signal T4 and the service response signal S5 is performed until a match between the corresponding options SO is obtained (steps S29, S30, S31). ). As a result, the default service option SO stored in the service option SO memory area of the visitor location register VLR 3a is reloaded with the service option for which a match is obtained (steps S32, S33, S34, S35, S36). , S37).

For this reason, in the subsequent incoming connection, the service option OS is connected with the service option SO previously designated by the switching center as the page signal T1. As a result, as in the case of routine A, the call connection transmits / receives the service connection signal T6 and the service connection signal T7 made between the mobile terminal and the switching center. It is set to the state of a currency call.

As is apparent from the above description, in accordance with the method for selecting and setting one service option from the multi-service option in the digital mobile communication system of the present invention, the switching center is configured when the switching center is performed at a subsequent call connection. As a result obtained through the negotiation performed on the first call connection, it is possible to initially specify a service option that the mobile terminal can support.

As a result, it is not necessary for the switching center to negotiate the service option every time the switching center makes a call connection. The time length of the call connection can be shortened, so that the processing load on the switching center can be reduced.

Claims (11)

A method of selecting and setting a service option from a multi-service option of a digital mobile communication system for selecting and setting a service option from a multi-service option of a digital mobile communication system to set a voice compression rate supported by a mobile terminal, A first processing step of setting, in subscriber data for each mobile terminal stored in the visitor location register of the switching center, a service option previously applied by the switching center at the highest priority; A second processing step in which the switching center performs a first call connection to the mobile terminal according to the service option set in the first processing step, wherein the service that the switching terminal can support in the first call connection; From the multi-service option of the digital mobile communication system comprising a second processing step of identifying the option and storing the service option, wherein the switching center specifies a service option stored by the switching station upon subsequent call connection. How to choose and set your service options. The method of claim 1, The first processing step, A sub-processing step of setting a service option memory area for subscriber data for each mobile terminal stored in the visitor location register of the switching center; And a sub-processing step of setting, by the switching center, a service option applied to the service option memory area in advance with the highest priority in advance. The service option selection and setting method from the multi-service option of the digital mobile communication system. The method of claim 1, The second processing step, A sub-processing step of storing the service option in the service option memory area by reloading the service option into the service option memory area and confirming by service negotiation whether the switching center has performed a first call connection with the mobile terminal; And further comprising a sub-processing step in which the switching center performs the call connection by initially specifying a stored service option when the switching center performs a subsequent call connection with the mobile terminal. How to select and set service options from service options. A digital mobile communication system belonging to the category of a CDMA digital cellular mobile communication system including an exchange station, The switching center has a visitor location register for storing one service option selected from a plurality of voice compression rates each mobile terminal can support, The switching center accommodates a plurality of wireless base stations, The CDMA digital cellular mobile communication system also includes a communication network connected to a home location register, which is a database storing subscriber data, The digital mobile communication system, First processing means for setting a service option applied by the switching center to the subscriber data for each mobile terminal stored in the visitor location register of the switching center in advance at the highest priority; Second processing means for performing a first call connection to the mobile terminal by a service option set in the first processing means, wherein, in the first call connection, the switching station is capable of supporting the mobile terminal; And a second processing means for identifying a service option, storing the service option, and designating the service option stored by the switching center in a subsequent call connection. The method of claim 4, wherein The first processing means sets a service option memory area for the subscriber data stored in the visitor location register of the switching center for each mobile terminal, and sets a service option previously applied by the switching station at the highest priority in the service option memory area. Digital mobile communication system. The method of claim 4, wherein The second processing means, when setting the service option performed by the first processing means, when the switching center performs the first call connection with the mobile terminal by reloading the service option in the service option memory area. Storing the service option confirmed by the exchange at the service negotiation, And the second processing means specifies the service option when the switching center performs a subsequent call connection with the mobile terminal. The method of claim 4, wherein Processing for storing a service option selected from a plurality of voice compression ratios by the first processing means, (Iii) initially designating a service option selected from a plurality of speech compression rates arranged at a priority determined by the switching center; (Ii) the mobile station receiving a page signal storing the specified service option; (Iii) if the mobile terminal is unable to support the service option informed by the page signal, the mobile terminal and the switching center may be one of a service option that the mobile terminal can support and a plurality of service options that the switching center has. Transmitting / receiving a service request signal and a service response signal between the mobile terminal and the switching center until a match is made between the service options of; (Iii) a digital mobile communication system performed by executing the step of reloading the matched service option into a service option memory area for each subscriber data of the visitor location register. The method of claim 7, wherein The mobile terminal and the switching center transmit / receive a service connection signal and a service connection completion signal therebetween, whereby the mobile terminal and the switching station have a service option that the mobile terminal can support and a plurality of services that the switching center has. And when a match is made between the service options of any one of the options, the digital mobile communication system is set to a state of a call at a voice compression rate corresponding to the service option in which the match is made. The method of claim 7, wherein And the switching station disconnects call connection processing when the service option that the mobile terminal can support does not match any one of a plurality of service options that the switching center has. The method of claim 4, wherein Subscriber data of the visitor location register, Electronic serial number, A mobile terminal identification number, With replacement service, The mobile terminal may support when each switching center performs a call connection for each of the mobile terminals, and is configured with a service option corresponding to a voice compression rate designated by the switching station preferentially, The switching center takes information of these items from the home location register device and references the information of the items, And the switching center performs a call connection to the mobile terminal. The method of claim 4, wherein Subscriber data of the home position register device, Electronic serial number, A mobile terminal identification number, With replacement service, Your name, Consists of the subscriber's address, With reference to the information of these items, the switching center performs a call connection to the mobile terminal.