Mobile communication system, mobile communication method, and mobile station for providing restriction information.

IS 2 387 183 T3

DESCRIPTION

Mobile communication system, mobile communication method, mobile station and exchange

BACKGROUND OF THE INVENTION

1. Field of the invention

The present invention relates to a mobile communication system, a mobile communication method, and a mobile station.

2. Related Art Description

In conventional mobile communication systems, for example, all passenger mobile stations on a train initiate transmission of a location registration request at the same time as the train crosses from one location registration area to another registration area. location, which causes the problem that overhead is imposed for processing on radio capacity and an exchange.

In addition, there is also another problem, that when a large amount of call processing is done at the same time for a specific event (for example, an application for a TV program or the like), the transmission of call requests to perform the Call processing causes overhead for processing on a radio capacity and an exchange.

To address these issues, current 3GPP specifications define “Domain Specific Access Control (hereinafter referred to as DSAC). According to the DSAC, a mobile communication system is configured to separately restrict processing on a circuit switch and processing on a packet switch if congestion occurs in a network.

Note that a mobile communication system to which DSAC does not apply is configured to restrict (prohibit) all processing on a circuit-switched and a packet-switched when congestion occurs on a circuit-switched network or a network-switched network. packages. Consequently, a mobile station cannot perform call / receive processing and location registration processing through either the circuit switch or the packet switch.

Furthermore, a mobile communication system to which the DSAC is applied has a configuration in which, when congestion occurs in a circuit-switched network or a packet-switched network, all processing is prohibited in a domain in which it has been congestion occurred, that is, on an exchange (a circuit switch or a packet switch) in the network where the congestion occurred. Therefore, the mobile station cannot perform call / receive call processing and location registration processing through exchange (circuit switched exchange or packet switched exchange) in the network in which it is located. has produced congestion.

With reference to Figures 1 to 3, description will be provided of an operation to restrict the processing performed on each exchange in a mobile communication system to which a conventional DSAC is applied.

As shown in Figures 1-3, in step S1000, an MSC circuit switched exchange or SGSN packet switched exchange detects congestion in a circuit switched network or a packet switched network.

In step S1001, the congestion-sensing exchange (the circuit-switched exchange MSC or the packet-switched exchange SGSN) transmits, to the radio network controller RNC, "a restriction indication CS" or "an indication of PS restriction ”to order to restrict all processing in the MSC circuit switched exchange or SGSN packet switched exchange.

In step S1002, the radio network controller RNC creates broadcast information including the CS restriction indication or the received PS restriction indication. In step S1003, the radio network controller RNC transmits the broadcast information created through a radio base station BTS to a location registration area belonging to the radio network controller RNC.

As a result, the mobile station cannot perform call / receive call processing and location registration processing through exchange (circuit switched exchange or packet switched exchange) in the network in which it is located. produces congestion.

[Non-patent document 1] 3GPP TS.24.008 V6.1.2.0 (6.c.0), released March 2006

[Non-patent document 2] 3GPP TS.25.331 V6.5.0, released March 2005

IS 2 387 183 T3

In general, a critical factor in congestion in a network is specific processing such as location registration processing, call processing, and the like. Therefore, in many cases, it is sufficient to restrict only some of such processing on an exchange, that is, it is not necessary to restrict all processing on the exchange.

However, a mobile communication system to which the aforementioned conventional DSAC is applied is configured to restrict all processing in a circuit switch or a packet switch for all mobile stations belonging to a specific location registration area. For this reason, there is a problem that such unnecessarily prohibitive restriction affects call reception processing of a mobile station in the area, processing which essentially should not be restricted, or location registration processing by a mobile station moving towards the specific location registration area.

3GPP TR 23.898, V.7.0.0, "Access Class Barring and Overload Protection" refers to prior art CS or PS domain specific access control.

SUMMARY OF THE INVENTION

The present invention has been made in view of the foregoing problems. Accordingly, it is an object of the present invention to provide a mobile communication system, a mobile communication method, and a mobile station, which can avoid congestion by restricting only the processing that causes the congestion without affecting processing that essentially should not be restricted. .

The object is achieved by the content of the independent claims. Examples are further provided to facilitate understanding of the invention.

A first example is summarized as a mobile communication system that includes a radio network controller and an exchange, in which the exchange includes a congestion factor detector configured to detect a congestion occurrence factor showing processing that produces the occurrence of congestion on the exchange, and a restriction indication transmitter configured to transmit a restriction indication by processing, to the radio network controller based on the detected congestion occurrence factor, the restriction indication commanding a type of processing that should be restricted in the exchange, and the radio network controller comprises: a broadcast information transmitter configured to transmit , to a mobile station, broadcast information including the received restriction indication.

In the first example, the exchange is any one of a circuit-switched exchange and a packet-switched exchange.

In the first example, the processing type shows at least one of location registration processing and call processing.

A second example is summarized as a mobile communication method to perform mobile communication through a radio network controller and an exchange, including: detecting, in the exchange, a congestion occurrence factor showing processing that produces the appearance of a congestion in the interchange; transmitting, on the exchange, a processing restriction indication to the radio network controller based on the detected congestion occurrence factor, the restriction indication commanding a type of processing that should be restricted on the exchange; transmitting, at the radio network controller, to a mobile station, broadcast information including the received restriction indication; and restricting, at the mobile station, the processing corresponding to the restriction indication included in the received broadcast information.

A third example is summarized as a mobile station configured to perform mobile communications through a radio network controller and an exchange, including: a broadcast information receiver configured to receive broadcast information transmitted from the radio network controller ; a parser configured to analyze a specific processing on a specific exchange to be restricted based on a processing restriction indication, which is included in the received broadcast information; and a processor configured to restrict specific processing on the specific exchange analyzed.

A fourth example is summarized as an exchange used in a mobile communication system, which includes: a congestion factor detector configured to detect a congestion occurrence factor displaying processing that results in the occurrence of congestion on the exchange; and a restriction indication transmitter configured to transmit a restriction indication to a radio network controller in the mobile communication system based on the detected congestion occurrence factor, the restriction indication commanding a type of processing that should restrict yourself in the exchange.

BRIEF DESCRIPTION OF THE VARIOUS VIEWS OF THE DRAWINGS

Fig. 1 is a diagram illustrating an operation when performing CS restriction or PS restriction in a conventional mobile communication system;

FIG. 2 is a sequence diagram showing an operation when CS restriction is performed in the conventional mobile communication system;

Fig. 3 is a sequence diagram showing an operation when PS restriction is performed in the conventional mobile communication system;

Figure 4 is a functional block diagram of an exchange according to a first embodiment of the present invention;

Figure 5 is a functional block diagram of a radio network controller according to the first embodiment of the present invention;

Fig. 6 is a diagram showing an example of radio network controller information according to the first embodiment of the present invention;

restriction to be received in FIG. 7 is a diagram showing an example of radio network controller information according to the first embodiment of the present invention;

restriction to be received in FIG. 8 is a diagram showing an example of radio network controller information according to the first embodiment of the present invention;

restriction to be received in FIG. 9 is a diagram showing an example of radio network controller information according to the first embodiment of the present invention;

restriction to be received in FIG. 10 is a diagram showing an example of radio network controller information according to the first embodiment of the present invention;

restriction to be received in Figure 11 is a functional block diagram of a mobile station according to the first present invention;

Embodiment of Fig. 12 is a diagram illustrating an operation when performing CS location registration restriction in a mobile communication system according to the first embodiment of the present invention;

Fig. 13 is a sequence diagram showing an operation when CS location registration restriction is performed in the mobile communication system according to the first embodiment of the present invention;

Fig. 14 is a diagram illustrating an operation when PS location registration restriction is performed in the mobile communication system according to the first embodiment of the present invention;

Fig. 15 is a sequence diagram showing an operation when PS location registration restriction is performed in the mobile communication system according to the first embodiment of the present invention;

Fig. 16 is a diagram illustrating an operation when CS call restriction is performed in the mobile communication system according to the first embodiment of the present invention;

Fig. 17 is a sequence diagram showing an operation when CS call restriction is performed in the mobile communication system according to the first embodiment of the present invention;

Fig. 18 is a sequence diagram showing operations when performing the call restriction CS and the location registration restriction CS in the mobile communication system according to the first embodiment of the present invention;

Fig. 19 is a sequence diagram showing operations when performing the call restriction CS and the location registration restriction PS in the mobile communication system according to the first embodiment of the present invention; and Fig. 20 is a sequence diagram showing an operation when the CS location registration restriction is canceled in the mobile communication system according to the first embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION (Configuration of a mobile communication system according to the first embodiment of the present invention)

The configuration of a mobile communication system according to a first embodiment of the present invention will now be described with reference to Figures 4 to 12.

As shown in Fig. 12, the mobile communication system according to the present embodiment is provided with an exchange (a circuit switched exchange MSC or a packet switched exchange SGSN), a radio network controller RNC, a plurality of base stations BS # A and BS # B and a plurality of mobile stations UE # 1 and UE # 2.

IS 2 387 183 T3

Circuit switched exchange MSC is a device responsible for circuit switched services and is configured to perform location registration processing for a circuit switched network of a mobile station UE and to perform communication restriction in the switched network by circuits.

Furthermore, the packet switched exchange SGSN is a device responsible for packet switched services and is configured to perform location registration processing for a packet switched network of mobile station UE and to perform communication restriction on the packet switched network.

As shown in Figure 4, the MSC or SGSN switching exchange is provided with a congestion factor detector 11 and a restriction indication transmitter 12.

The congestion factor detector 11 is configured to detect a congestion occurrence factor showing processing that causes congestion to occur in the MSC or SGSN switch exchange.

Specifically, the congestion factor detector 11 is configured to detect which processing caused the occurrence of congestion in the MSC or SGSN switch exchange.

For example, the congestion factor detector 11 may be configured to detect the occurrence of congestion based on CPU usage. For example, if a process with CPU usage greater than a predetermined threshold is detected (for example, a location registration process or a calling process), the congestion factor detector 11 determines that this process caused the occurrence of congestion.

Note that the congestion factor detector 11 may be configured to detect that congestion is caused by a single congestion factor or it may be configured to detect that congestion is caused by a plurality of factors.

The restriction indication transmitter 12 is configured to transmit, to the radio network controller RNC, a restriction indication by processing to command a type of processing (eg, location registration processing or call processing) that should be restricted in the MSC or SGSN switch exchange, based on the congestion occurrence factor detected by the congestion factor detector 11.

For example, if the restriction indication transmitter 12 detects a process with CPU usage greater than a predetermined threshold (for example, a location registration process or a calling process), the restriction indication transmitter 12 may be configured to transmit a restriction indication (for example, a location registration restriction indication or a call restriction indication) for ordering to restrict the corresponding processing (eg, location registration processing or call processing) on ​​the UE mobile station side.

Note that the restriction indication transmitter 12 may be configured to transmit a restriction indication to restrict a single processing or it may be configured to transmit a restriction indication to restrict a plurality of processes.

The radio network controller RNC is a device responsible for performing the radio communication control processing with the mobile stations UE.

Furthermore, the radio network controller RNC is configured to exchange predetermined information with the mobile station UE via a radio network and is configured to notify the MSC / SGSN switch exchange of the predetermined information exchanged with the mobile station UE.

As shown in Fig. 5, the radio network controller RNC is provided with a restriction indication receiver 21 and a broadcast information transmitter 22.

The restriction indication receiver 21 is configured to receive a restriction indication transmitted from the MSC / SGSN switch exchange.

The broadcast information transmitter 22 is configured to create broadcast information including the restriction indication received by the restriction indication receiver 21 for transmitting the information to the mobile station UE.

In this case, the broadcast information transmitter 22 is configured to separately create and transmit broadcast information for the circuit-switched network and broadcast information for the packet-switched network.

Note that broadcast information transmitter 22 may create and transmit broadcast information to restrict a processing or it may create and transmit broadcast information to restrict a plurality of processing.

IS 2 387 183 T3

FIG. 6 shows an example of broadcast information created by broadcast information transmitter 22.

As shown in Figure 7, the broadcast information used in a conventional mobile communication system is configured such that "SIB3 (System Information Block Type 3, System Information Block Type 3)" defined by 3GPP would include an indication normal restriction, a CS restriction indication, and a PS restriction indication.

Instead, as shown in Figures 8 to 10, the mobile communication system according to the present invention is configured so that the broadcast information transmitter 22 adds a restriction indication (a location registration restriction indication, a origin restriction indication, or the like) to "SIB3" and broadcast them to a plurality of mobile stations UE.

Specifically, as shown in FIG. 8, the broadcast information transmitter 22 may be configured to add information elements that display restriction indications such as a location registration restriction indication, a call restriction indication, a restriction indication. call reception restriction, and similar to "SIB3" and to define "presence or absence of a CS constraint (true or false)" and "presence or absence of a PS constraint (true or false)" for each of the information elements.

For example, if the CS restriction is "true", the location registration restriction indication is "true", and the restriction indication other than these is "false", the mobile station UE may determine that "only the Location Register Processing in MSC Circuit Switched Exchange ”.

Furthermore, as shown in FIG. 9, the broadcast information transmitter 22 may be configured to add information elements showing restriction indications respectively to the information element showing the restriction indication CS and the information element showing the restriction indication. PS restriction indication in the “SIB3” and to define the “presence or absence of a location registration restriction”, “presence or absence of a call restriction”, "Presence or absence of a call reception restriction" and the like respectively in the information elements showing the added restriction indications.

For example, if the location record processing in the MSC circuit-switched exchange and the call processing in the SGSN packet-switched exchange are restricted, "access class" in the information element showing the restriction indication CS is "true", and only "location record restriction indication" in information element showing restriction indication in information element showing restriction indication CS is "true", "access class" in information element showing the PS restriction indication is "true", and only "the call restriction indication" in the information element showing the restriction indication in the information element showing the restriction indication PS is "true".

Furthermore, as shown in FIG. 10, the broadcast information transmitter 22 may be configured to add an information element showing a restriction indication separately from the information element showing the restriction indication CS and the information element. showing the PS restriction indication in “SIB3” and to define the “presence or absence of a location record restriction”, “presence or absence of a call restriction”, "Presence or absence of a call reception restriction", and the like in each of the information elements showing the added restriction indications.

According to the example of FIG. 10, the broadcast information transmitter 22 may define the "presence or absence of a location registration restriction", "presence or absence of a call restriction", "presence or absence of a location restriction. call reception ", and the like regardless of" the presence or absence of the CS restriction "and" the presence or absence of the PS restriction ".

For example, even if both the CS constraint and the PS constraint are "false", the mobile station UE is restricted in processing that the information element showing a restriction indication is "true".

Note that broadcast information transmitter 22 may be configured to create and transmit broadcast information that includes a restriction indication if congestion occurs in radio capacity.

As shown in Fig. 11, the mobile station UE is provided with a broadcast information receiver 31, an analyzer 32, a location register processor 33, a call processor 34, and a call reception processor 35.

The broadcast information receiver 31 is configured to receive broadcast information transmitted from the radio network controller RNC.

Analyzer 32 is configured to analyze specific processing on the specific exchange (the MSC circuit-switched exchange or the SGSN packet-switched exchange) that is going to

ES 2 387 183 T3 be restricted based on the restriction indication included in the broadcast information received by the broadcast information receiver 31 (see FIG. 6).

Location register processor 33, call processor 34, and call receive processor 35 are configured to suppress specific processing on the specific exchange (the MSC circuit switched exchange or the SGSN packet switched exchange) analyzed by analyzer 32.

Specifically, the location registration processor 33 is configured to transmit a location registration request CS or a location registration request PS to the circuit switched exchange MSC or to the packet switched exchange SGSN to perform registration processing of Location.

Furthermore, the location register processor 33 is configured to suppress the location register processing on the specific exchange (the MSC circuit switched exchange or the SGSN packet switched exchange) analyzed by the parser 32.

Specifically, the call processor 34 is configured to perform call processing by transmitting a CS call request or a PS call request to the MSC circuit switched exchange or SGSN packet switched exchange.

In addition, the call processor 34 is configured to suppress call processing on the specific exchange (the MSC circuit-switched exchange or the SGSN packet-switched exchange) analyzed by the analyzer 32.

Specifically, the call pickup processor 35 is configured to perform call pickup processing by receiving a call pickup notification CS or a call pickup notification PS from the MSC circuit switched exchange or SGSN packet switched exchange. .

In addition, the call pickup processor 35 is configured to suppress call pickup processing on the specific exchange (the MSC circuit-switched exchange or the SGSN packet-switched exchange) analyzed by the analyzer 32.

(Operation of the mobile communication system according to the first embodiment of the present invention)

With reference to Figures 11 to 20, the operation of the mobile communication system according to the first embodiment of the present invention will be described. Note that in the examples of Figures 11 to 20, a base station BS only transfers information, and the description thereof will be omitted.

First, with reference to Figs. 12 to 14, description will be provided of an operation that is performed in a case where a CS location registration restriction or a PS location registration restriction is performed in the monitoring system. mobile communication according to the present embodiment.

If a train moves from location registration area A to location registration area B in step S100, the mobile stations US # 1 of the train users transmit location registration requests (location registration requests CS , location registration requests PS, or location registration requests CS / PS) at the same time, in the location registration area B in step S101.

In step S102, an exchange (an MSC circuit-switched exchange or SGSN packet-switched exchange) receives a large number of location registration requests, which causes congestion.

In step S103, the switch exchange MSC or SGSN transmits, to a radio network controller RNC, a location registration restriction indication (a location registration restriction indication CS or a location registration restriction indication PS) to restrict location registration processing on the exchange.

In step S104, the radio network controller RNC creates broadcast information including the received location registration restriction indication, and in step S105 transmits the created broadcast information via broadcast to location registration area B .

In step S106, receiving and analyzing the broadcast information, the mobile station UE # 1 recognizes that the location registration processing is restricted in the location registration area B and suppresses the location registration processing in the registration area. location B.

Note that even in such a case, since a mobile station UE # 2, which already belongs to the location registration area B, has already performed the location registration processing, the mobile station UE # 2 can perform the processing call and receiving calls.

In particular, at a boundary of a location registration area along a railway, the radio network controller RNC continuously transmits broadcast information including the indication of registration restriction of

ES 2 387 183 T3 location (note that the restriction rate is changed in operation) to prevent location registration processing from being performed at the same time, so that the above-mentioned congestion can be avoided.

Second, with reference to Figures 15 to 17, the description of an operation that is performed in a case where the CS call restriction or PS call restriction is performed in the mobile communication system according to the present will be provided. invention.

In step S201, the mobile stations UE transmit call requests (CS call requests (for example, voice call start requests or TV call start requests)) or PS call requests (for example, call requests). i-mode connection (registered trademark) or mail transmission requests) at the same time if it is a specific event.

In step S202, the exchange (the MSC circuit-switched exchange or the SGSN packet-switched exchange) receives a large number of call requests, which causes congestion.

In step S203, the switch exchange MSC or SGSN transmits, to the radio network controller RNC, a call restriction indication (a call restriction indication CS or a call restriction indication PS) to restrict the processing of calls. call in the exchange.

In step S204, the radio network controller RNC creates broadcast information including the received call restriction indication, and in step S205, it transmits the created broadcast information through broadcast to a specific area.

In step S206, receiving and analyzing the broadcast information, the mobile station UE recognizes that the call processing is restricted in the specific area and suppresses the call processing in the specific area.

Third, with reference to Fig. 18, description will be provided of an operation that is performed in a case where a call restriction CS and a location registration restriction CS is performed in the mobile communication system according to the present embodiment.

In step S301, a plurality of mobile stations UE transmit CS call requests, and in step S302 transmit CS location registration requests.

In step S303, the circuit switched exchange MSC receives a large number of call requests CS and location registration requests CS, which causes congestion.

In step S304, the circuit-switched exchange MSC transmits, to the radio network controller RNC, a call restriction indication CS and a location registration restriction indication CS to restrict CS call processing and call processing. CS location register in circuit switched exchange MSC.

In step S305, the radio network controller RNC creates broadcast information including the call restriction indication CS and the received location registration restriction indication CS, and in step S306 transmits the broadcast information created through diffusion to a specific area.

In step S307, receiving and analyzing the broadcast information, the mobile station UE recognizes that the call processing CS and the location registration processing CS are restricted in the specific area and suppresses the call processing CS and the registration processing. CS location in the specific area.

Fourth, with reference to Fig. 19, description will be provided of an operation that is performed in a case where the call restriction CS and the location registration restriction PS are performed in the mobile communication system according to the present embodiment.

In step S401, a plurality of mobile stations UE transmit CS call requests, and in step S402 transmit PS location registration requests.

In step S403, the MSC circuit-switched exchange receives a large number of CS call requests, which causes congestion.

In step S404, the circuit switched exchange MSC transmits, to the radio network controller RNC, the call restriction indication CS to restrict the processing of call CS in the circuit switched exchange MSC.

Furthermore, in step S405, the packet switched exchange SGSN receives a large number of PS location registration requests, which causes congestion.

IS 2 387 183 T3

In step S406, the SGSN packet switched exchange transmits, to the radio network controller RNC, a PS location registration restriction indication to restrict PS location registration processing in the SGSN packet switched exchange.

In step S407, the radio network controller RNC creates broadcast information including the call restriction indication CS and the received location registration restriction indication PS, and in step S408 transmits the broadcast information created through diffusion to a specific area.

In step S409, receiving and analyzing the broadcast information, the mobile station UE recognizes that the call processing CS and the location registration processing PS are restricted in the specific area and suppresses the call processing CS and the registration processing. location PS in the specific area.

Fifth, with reference to Fig. 20, description will be provided of an operation that is performed in a case where the CS location registration restriction is canceled.

In step S501, the radio network controller RNC creates broadcast information including a location registration restriction indication CS and transmits the created broadcast information as "SYSTEM INFORMATION" by broadcast.

In step S502, receiving and analyzing the broadcast information, the mobile station UE that has moved to the specific area recognizes that the location record CS is restricted in the specific area and deletes the location record CS in the specific area.

In step S503, the mobile station UE uses "Routing Area Update Request (update type: RA update)" to transmit a PS location registration request to the SGSN packet switching exchange in the specific area.

In step S504, the mobile station UE receives, from the SGSN packet switching exchange, "Routing Area Update Accept, routing area update acceptance (update result: RA updated)" which notifies that location registration processing PS is complete in the specific area.

In step S505, the circuit-switched exchange MSC transmits, to the radio network controller RNC, a CS location registration restriction cancel order to order to cancel the CS location registration processing restriction in the specific area.

In step S506, the radio network controller RNC creates broadcast information including the received CS location registration restriction cancellation command, and in step S507 transmits "Paging Type 1 (bcch modify), (paging type 1 (bcch modification)) ", and then in step S508 transmits the broadcast information created as" SYSTEM INFORMATION "through broadcast to the specific area.

In step S509, receiving and analyzing the broadcast information, the mobile station UE recognizes that the location registration processing restriction is canceled in the specific area.

In step S510, the mobile station UE uses "Routing Area Update Request (update type: combined RALA updating with IMSI attach, update type: RALA update combined with IMSI adherence)" to transmit a CS location registration request to the exchange of SGSN packet switching in the specific area.

In step S511, the packet switched exchange SGSN transmits, to the circuit switched exchange MSC, a CS location registration request for the mobile station UE in response to the "Routing Area Update Request (update type: RALA update combined with IMSI adhesion) ”received.

In step S512, the SGSN packet switching exchange transmits to the mobile station UE "Routing Area Update Accept (update result: combined RA / LA update)" which is a notification of completion of the CS location registration processing in the specific area.

(Advantageous effects of the mobile communication system according to the first embodiment of the present invention)

According to the mobile communication system according to the first embodiment of the present invention, the MSC or SGSN switching exchange restriction indication transmitter 12 specifies and restricts the congestion-producing processing on each exchange, so that an adverse effect on processing that should not be restricted.

Furthermore, according to the mobile communication system according to the first embodiment of the present embodiment, the MSC or SGSN switching exchange restriction indication transmitter 12 continuously transmits restriction indications at a specific place (such as a boundary of a registration area location on a railway) in order to restrict specific processing (location registration processing) at the specific place in advance, so that a state of congestion can be avoided.