WO2006103726A1

WO2006103726A1 - Disaster area communication line capture system and mobile communication system

Info

Publication number: WO2006103726A1
Application number: PCT/JP2005/005668
Authority: WO
Inventors: Yoshiaki Ohnishi; Yasuharu Ebisawa; Toshio Fujishiro
Original assignee: Fujitsu Limited
Priority date: 2005-03-28
Filing date: 2005-03-28
Publication date: 2006-10-05
Also published as: JPWO2006103726A1; JP4513859B2

Abstract

[PROBLEMS] To provide a disaster area communication line capture system for reducing a congestion due to shortage of a communication band caused by increase of communication with a disaster area caused, for example, by an earthquake, in a mobile communication system and an IP telephone system using the ATM communication as a core network. [MEANS FOR SOLVING PROBLEMS] The disaster area communication line capture system includes disaster area registration means for registering information identifying a disaster area, disaster area communication judgment means for judging whether a signal is a communication signal to the disaster area according to the registered information in the disaster area registration means, and route selection means for route-selecting the communication signal to the disaster area to signal compression means having a signal compression function according to the judgment result of the disaster area communication judgment means.

Description

Disaster area communication line acquisition system and mobile communication system

[0001] The present invention relates to a mobile communication system having a network using an asynchronous transfer mode (ATM synchronous transfer mode) communication or the like as a core network or an IP telephone system using an internet protocol (IP) network. In particular, the present invention relates to a disaster area communication line acquisition system and a mobile communication system that reduce occurrence of a communication band shortage that occurs when a disaster such as a large-scale earthquake occurs and communication is concentrated in the disaster area. Background art

A mobile communication system using ATM communication as a core network is used in a mobile communication system represented by F OMA (registered trademark) of NTT DoCoMo, Inc. In these mobile communication systems, there are restrictions on outgoing calls and incoming calls to disaster areas as countermeasures in the event of a large-scale earthquake and other disasters. There are disaster message dials provided by the group and i-mode disaster message board services, etc., and transmission to disaster areas is suppressed.

[0003] Also, in mobile communication systems using ATM communication as a core network, public switched telephone networks (PSTN) communication signals are transmitted using ATM adaptation layer type 1 (AAL1: ATM adaptation layer). type 1), and the base transceiver station (BTS: base transceiver station), radio network controller (RNC: radio network controller) and LS-level mobile communication equipment that constitutes the mobile communication system. -Communication signals between MSC (local mobile switching center) are transmitted using ATM adaptation layer type 2 (AAL2).

[0004] FIG. 8 is a diagram for explaining cell frames of AA1 and AAL2, and shows cell frame formats of AAL1 and AAL2. Both AAL1 and AAL2 have a 5-byte ATM cell header. AAL1 has a 48-byte payload. AAL2 has a 6-bit start field and multiple variable-length packets in the portion corresponding to the 48-byte payload of AAL1. Each variable-length packet consists of a 3-byte header and a variable-length packet payload. It is made. Details of the ATM cell header, start field, and variable length packet header are omitted. AAL1 is generally suitable for continuous bit streams such as telephone services. AAL2 is generally suitable for variable bitstreams such as low-bit-rate audio signals with signal compression.

FIG. 9 is a diagram (1) illustrating a mobile communication system using ATM communication as a core network, and FIG. 10 is a diagram (2) illustrating a mobile communication system using ATM communication as a core network. 210 is the PSTN for region B, 211 is the subscriber phone, 216 is the GS mobile mobile switching center (G-MSC), 220 is the PSTN for region C, 221 is the subscriber phone, 226 is the G-MSC, 207 Is a TS mobile switching center (T-MSC), 206 is a G-MSC in area A, 205 is a multimedia processing equipment (MPE), 204 is an L-MSC, 203 is an RNC, 202 is a BTS, 201 is a mobile station (MS).

FIG. 9 shows a route through which the communication signal of the subscriber telephone 211 in the region B and the region C is transmitted to the MS 201 in the region A that is the communication partner.

[0007] FIG. 10 shows the signal form transmitted from the regional B subscriber telephone 211 to the MS 201 in the area A shown in FIG.

[0008] The communication signal of the subscriber telephone 211 is transmitted to the PSTN 210 by a synchronous transfer module (STM:

synchronous transport module) is transferred to G-MSC216 via the line. The G-MSC 216 transfers the communication signal to the T-MSC 207 corresponding to the upper station by the AAL1 signal via the ATM line. The T-MSC 207 transfers the communication signal to the G-MSC 206 in area A, which is the communication destination, using an AAL1 signal. G—SMC206 transfers the communication signal to L-MSC204 that covers the area where MS201 of the communication destination exists using AAL1 signal. The L-MSC 204 transfers the communication signal to the MPE 205 that inserts a ringing tone using the AAL1 signal. The MPE 205 inserts a ringing tone or the like as necessary in the call sequence, compresses the communication signal, and transfers it to the L-MSC 204 as an AAL2 signal. In the compression, for example, an AMR (adaptive multi rate) method is used in which an audio signal is compressed stepwise to 1.95-12.2 kbit / sec according to the interference state or the like. The communication signal transferred by the AAL2 signal is transmitted from the LM SC 204 via the RNC 203 to the MS 201 as the communication destination from the BTS 202 to the MS 201 via the AAL2 signal. Transferred with AAL2 signal.

FIG. 11 is a diagram for explaining an IP telephone system. The communication signal of the IP phone 411 in region B is connected to the IP network via a gateway (GW), and the communication signal is transmitted to the Telecommunications Standards Department (ITU-T) of the International Telecommunication Union. : International telecommunication union-telecommunication standardization sector) Recommendation G. 11 (hereinafter referred to as G. 711 and ti.) Coded data of 64 kbit / sec is transferred in accordance with the voice coding method defined in j. The communication signal of subscriber phone 421 of C is transferred to the IP network as G.711 code data via PSTM420 via the STM line via GW422, and the communication signal from regions B and C is the G.711 code. The data is transferred to the IP phone 401 in area A, which is the communication destination, via the GW 402 as digitized data.

[0010] In order to guarantee the call quality to the ATM network as described above, it is necessary for the network side to guarantee the bandwidth declared by the ATM subscriber. However, if many subscriber calls are concentrated due to a disaster, etc., bandwidth calculation processing becomes heavy, and it takes time to process calls and calls, resulting in congestion due to inability to handle calls. It is assumed that

[0011] When a virtual channel (VC: virtual channel) is set in a terminal of an ATM network including relay exchanges where calls are concentrated in this way, the bandwidth of the virtual path (VP: virtual path) is changed in steps. A technology for performing bandwidth management is disclosed (for example, see Patent Document 1)

[0012] Further, a technique for multiplexing a variable-length packet such as an AAL2 short cell into a virtual connection in a fixed-length packet transfer network such as an ATM network is disclosed (for example, see Patent Document 2). ).

Patent Document 1: Japanese Patent Laid-Open No. 10-308745

Patent Document 2: Japanese Patent Laid-Open No. 11 122252

Disclosure of the invention

[0013] (Problems to be solved by the invention)

Fig. 12 is a diagram for explaining a mobile communication system using ATM communication as a core network when a disaster occurs. The system configuration in FIG. 12 is the same as the system configuration in FIG. Figure 12 shows the case where a disaster such as an earthquake occurred in area A. In Region A as shown in Figure 12. In the event of a disaster, communications from Region B, Region C, and other regions (not shown) to Region A will increase, G-MSC206 processing will increase, and G-MSC206 and L-MSC 204 There is a greater possibility that congestion will occur due to a lack of bandwidth in the line between the two.

[0014] When congestion is likely to occur due to the occurrence of a disaster or the like as described above, a system for restricting traffic to the disaster area by restricting transmission to the disaster area and suppressing traffic to the disaster area is a system. It is taken.

Similarly, even in FIG. 11, when a disaster occurs in area A, incoming calls in area A increase, resulting in insufficient bandwidth of GW 402.

[0016] In the present invention, in a mobile communication system or IP telephone system in which a network using ATM communication or the like is used as a core network, a communication band is insufficient due to an increase in communication to the disaster area due to a disaster such as an earthquake. It is an object of the present invention to provide a disaster area communication line acquisition system and a mobile communication system that improve the situation in which congestion occurs. (Means for solving problems)

According to a first aspect of the present invention, in a mobile communication system using ATM communication as a core network, a disaster area registration means for registering information for identifying a disaster area, and a disaster area registration means 1 based on the registration information of the disaster area registration means. A disaster area communication discriminating means for discriminating a communication signal to the area, and a route selection for selecting a communication signal to the disaster area to a signal compression means having a signal compression function based on a discrimination result of the disaster area communication discriminating means A disaster area communication line acquisition system characterized by comprising:

[0017] Further, the second invention provides a disaster area registration means for registering information for specifying a disaster area in an IP telephone system using an IP network, and a disaster area based on the registration information of the disaster area registration means. A disaster area communication discriminating means for discriminating a communication signal to the area; and a signal compression means for compressing the communication signal to the disaster area based on the discrimination result of the disaster area communication discrimination means! It is a disaster area communication line acquisition system.

[0018] According to the first and second inventions, congestion due to a lack of communication bandwidth due to communication to a disaster area that is expected to increase during a disaster can be reduced by compressing a communication signal to the disaster area. Therefore, it is possible to provide a disaster area communication line acquisition system that can be suppressed. [0019] The third invention adds a first identifier indicating the determination result of the disaster area communication determination means of the first invention and a second identifier indicating the signal compression result of the signal compression means to the communication signal. It is a disaster area communication line acquisition system characterized by

[0020] In addition, the fourth invention uses the third identifier indicating the determination result of the disaster area communication determining means of the second invention and the fourth identifier indicating the signal compression result in the signal compression means as the communication signal. It is a disaster area communication line acquisition system characterized by being added.

[0021] According to the third and fourth inventions, the communication signal to the disaster area is compressed even when the area including the disaster area communication determination unit and the area including the signal compression unit are different. It is possible to provide a disaster area communication line acquisition system capable of performing the above. (The invention's effect)

According to the present invention, it is possible to suppress congestion due to insufficient communication bandwidth. Brief Description of Drawings

FIG. 1 is a diagram (1) for explaining the outline of the present invention.

FIG. 2 is a diagram (1) illustrating the system operation of the present invention.

FIG. 3 is a diagram (2) illustrating the system operation of the present invention.

FIG. 4 is a diagram (1) illustrating a control process of the system of the present invention.

FIG. 5 is a diagram (2) for explaining the outline of the present invention.

FIG. 6 is a diagram (3) illustrating the system operation of the present invention.

FIG. 7 is a diagram (2) illustrating a control process of the system of the present invention.

FIG. 8 is a diagram for explaining cell frames of AAL1 and AAL2.

FIG. 9 is a diagram (1) illustrating a mobile communication system using ATM communication as a core network.

FIG. 10 is a diagram (2) illustrating a mobile communication system using ATM communication as a core network.

FIG. 11 is a diagram for explaining an IP telephone system.

[FIG. 12] A diagram illustrating a mobile communication system using ATM communication as a core network in the event of a disaster.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the details of the present invention will be described with reference to the drawings. In the drawings, the same or similar elements are denoted by the same reference numerals. (Example 1)

1 is a diagram (1) for explaining the outline of the present invention. 101 is MS, 102 is BTS, 103 is RNC, 104 is L-MSC, 105 is MPE, and 106 is G-MSC. 110 is a PSTN, 111 is a subscriber phone, 114 is an L-MSC, 115 is an MPE, and 106 is a G-MSC. 120 is a PSTN, 121 is a subscriber phone, 124 is an L-MSC, 125 is an MPE, and 126 is a G-MSC. It is assumed that a large-scale disaster has occurred in region A. In addition, area B subscriber telephone 111 and area C subscriber telephone 121 communicate with MS 101 in area A where the disaster occurred. However, MS101 is a collective term for MSs that are located in the area A where disasters occur in a single MS and are under the control of BTS102.

[0024] The communication of the subscriber telephone 111 is connected to the G-MSC 116 at the gateway station for connecting to the mobile communication network via the PSTN 110 !. When the G-MSC 116 determines that the call from the subscriber phone 111 is a communication to the disaster area, the AAL1 signal obtained by converting the communication signal from the subscriber phone 111 into a cell at the MPE 115 via the subordinate L-MSC 114 is converted to the AAL2 The signal is compressed and transferred to area A via T-MS C107. Similarly, the communication of the subscriber telephone 121 is connected to the G-MSC 126 via the PSTN 120 to the gateway station for connection to the mobile communication network. When the G-MSC 126 determines that the call from the subscriber phone 121 is to the disaster area (specific area), the communication signal from the subscriber phone 121 is converted into a cell by the MPE 125 via the subordinate L-MSC 124. The compressed AAL1 signal is compressed into an AAL2 signal and transferred to region A via T-MSC107. In the compression, for example, an audio signal of 64 kbit / sec or 32 Kbit / sec is compressed to 1.95-12.2 kbit / sec. Communication signals from region B and region C to region A are connected to MS 101 via G-MSC 106, T-MSC 104, RNC 103, and BTS 102.

[0025] Therefore, the signals processed by G-MSC106 and T-MSC104 in area A are AAL2 signals that have been compressed and the communication bandwidth has been reduced, so there are many more than in normal times (when no disaster has occurred). Call processing can be performed.

FIG. 2 is a diagram (1) illustrating the system operation of the present invention. In the system configuration of the region A and the region B in FIG. 1, the system operation will be described based on signals in the system. Similar to the explanation in Figure 1 above, assume that a large-scale disaster occurs in region A. In addition, the subscriber telephone 111 in area B communicates with MS 101 in area A where the disaster occurred. However, MS101 is a collective term for MSs that are located in the area A where disasters occur, and that are under the control of BTS102.

[0027] The system operation of the present invention will be described for each symbol in FIG.

[0028] (1) Call MS 101 in area A where the disaster occurred from subscriber phone 111. The communication signal of 111 telephones is connected to the G-MSC 116 via the PSTN 110 as a 64 Kbit / sec signal on a synchronous transport module (STM) line and converted to an AAL1 signal. The disaster area communication discriminating means 62 of the G-MSC 116 analyzes the other party number, compares it with the disaster area registration means 61 in which information indicating the disaster area is registered, and the communication signal is a communication signal to the disaster area. Is determined.

[0029] (2) As a result of the determination, if the communication signal is a communication signal to the disaster area and can be compressed by the MPE 115 under the G-MSC 116, the route selection means of the G-MSC 116 63 The AAL1 signal is routed to the MPE 115 via the L-MSC 114 by the route selection means provided in the G-MSC 116. At that time, the G-MSC 116 uses the IAM (initial address message) signal, which contains the other party's telephone number information, which is a call control protocol signal, to indicate the result of determining whether the communication is to the disaster area. Add a regional identifier and transfer it to another exchange.

[0030] (3) The MPE 115 recognizes that the received AAL1 signal is a communication signal for the disaster area based on the disaster area identifier of the transferred IAM signal, and converts it into an AAL2 signal. At that time, the MPE 115 adds a disaster compression identifier indicating that the communication is to the disaster area subjected to signal compression to the IAM signal and transfers it to another switch or the like. Note that the disaster compression identifier can be configured in a pair with the disaster area identifier. The L-MSC 114 routes the communication signal compressed into the AAL2 signal so as to return to the G-MSC 116 via the L-MSC 114.

[0031] (4) The route selection means 63 of the G-MSC 116 transfers the communication signal compressed and returned to the AAL2 signal to the T-MSC 107, which is the upper hierarchy, in order to transfer it to the area A.

(5) The T-MSC 107 transfers the communication signal compressed into the AAL2 signal to the G-MSC 106 that manages the area A.

[0033] (6) The communication signal compressed into the AAL2 signal is an L- Forwarded to MSC104. The L-MSC 104 transfers the communication signal based on the disaster compression identifier added to the IAM signal and the disaster area identifier. The transfer destination is RNC 103 if compressed by the disaster compression identifier, and MPE 105 if uncompressed. Note that the MPE 105 has a sound source such as a ringing tone and a ringback tone, and the communication signal is connected to the MPE 105 when connection to the sound source is required in call processing.

FIG. 3 is a diagram (2) illustrating the system operation of the present invention. The difference from FIG. 2 is that MPE115 is not under G-MSC 116 and L-MSC134 and MPE135 are under G-MSC106. It is configured to manage region D, which consists of

[0035] The system operation of the present invention will be described for each code in FIG.

[0036] (11) Make a call from the subscriber phone 111 to the MS 101 in the area A where the disaster occurred. The communication signal of 111 telephones is connected to the G-MS C116 via the PSTN110 as a 64 Kbit / sec signal on the STM line and converted to an AAL1 signal. The disaster area communication discriminating means 62 of the G-MSC 116 analyzes the destination number and collates with the disaster area registration means 61 in which information indicating the disaster area is registered, and the communication signal is a communication signal to the disaster area. Is determined.

[0037] (12) As a result of the determination, the communication signal is a communication signal to the disaster area, and there is no MPE having a signal compression function under the G-MSC116, or there is an MPE but a new signal compression When it is difficult to increase the number of lines to be connected, the route selection means 63 of the G-MSC 116 transfers the AAL1 signal to the T-MSC 107 on the upper level. The G-MSC116 compresses the IAM signal, which is a communication signal to the disaster area, indicating the result of determining whether the communication signal is for the disaster area, and compresses the IAM signal to the disaster area. A disaster compression identifier is added to indicate that this is transferred to another exchange. It is also possible to configure the disaster compression identifier and the disaster area identifier as a pair.

(13) The T-MSC 107 transfers the AAL1 signal to the G-MSC 106 that manages the destination area A.

[0039] (14) The disaster area communication discriminating means 62 of the G-MSC 106 uses the disaster compression identifier added to the IAM signal and the disaster area identifier, and the AAL1 signal is a communication signal to the disaster area. The route selection means 63 of the G-MSC 106 determines that the A Route the AL1 signal to forward to L-MSC134 in Region D, not in the disaster area!

(15) The AAL1 signal transferred through the L-MSC 134 is compressed by the MPE 135 from the AAL1 signal to the AAL2 signal. The compressed AAL2 signal is routed back to the L-MSC 134 and back to the G-MSC 106.

[0041] (16) The L-MSC 104 determines the communication signal from the upper-tier G-MSC 106 based on the disaster compression identifier and the disaster area identifier added to the IAM signal, and is an uncompressed signal. If it is, then it is routed so that it is transferred to the BTS 102 via the RNC 103 if it is a compressed communication signal. In the compression, for example, an audio signal of 64 kbit / sec or 32 Kbit / sec is compressed to 1.95-12.2 kbit / sec. Note that the MPE 105 has a sound source such as a ringing tone and a ring back tone, and the communication signal is connected to the MPE 105 when connection with the sound source is required in call processing.

FIG. 4 is a diagram (1) for explaining the control processing of the system of the present invention. The system in the case where communication is performed from the subscriber telephone 111 in the area B described in FIG. 2 to the MS 101 in the area A which is a disaster area. The control process will be described for each sequence.

[0043] Sequence 21 (hereinafter referred to as S (21)): Subscriber telephone 111 makes a call.

S (22): PSTN 110 that accommodates subscriber telephone 111 transfers an IAM signal, which is a common line signaling call control protocol signal, to G-MSC 116 having PSTN 110 under its control.

[0045] S (23): G-MSC 116 analyzes the other party.

[0046] S (24): The disaster area communication discriminating means 62 of the G-MSC 116 collates with the disaster area registering means 61 in which information indicating the disaster area is registered, and the destination is the disaster area registering means. Determine if it is registered. (It is assumed that the result of discrimination is registered.)

S (25): The route selection means 63 of the G-MSC 116 adds an AAL parameter indicating that the communication signal is an AAL1 signal and a disaster area identifier indicating that the other party is a disaster area to the IAM signal. To L-MSC114.

[0047] S (26): L-MSC 114 connects the communication signal to MPE 115 and converts the communication signal into an AAL2 signal. [0048] S (27): L-MSC 114 indicates that the communication signal is an AAL2 signal indicating that the communication signal is an AAL2 signal, a disaster area identifier indicating that the other party is a disaster area, and that the communication signal has been compressed. Is added to the IAM signal and transferred to the G-MSC116.

[0049] S (28): The route selection means 63 of the G-MSC 116 recognizes that the communication signal has been compressed based on the disaster area identifier and disaster compression identifier of the IAM signal, and sends the communication signal to the other party. Route to the destination.

[0050] S (29): The G-MSC 116 has an AAL parameter indicating that the communication signal is an AAL2 signal, a disaster area identifier indicating that the other party is a disaster area, and the communication signal is compressed. The IAM signal with the disaster compression identifier indicating is sent to the L-MSC104.

[0051] S (30): L-MSC 104 recognizes that the communication signal has been compressed based on the disaster area identifier and the disaster compression identifier of the IAM signal, and routes the communication signal to the other party.

[0052] As described above, for communications in which the other party is in a disaster area, the L-MSC that has the MPE capable of signal compression in the G-MSC before the communication signal is transferred to the L-MSC in the disaster area. -Route the communication signal to the MSC and compress it into an AAL2 signal. As a result, one communication signal band processed between the G-MSC 106 and the L-MSC 104 in the disaster area is reduced, the number of communication signals that can be processed can be increased, and congestion can be suppressed. Note that G-MSC, L-MSC, and MPE without symbols are generic names.

[0053] Also, in this embodiment, the same means as described above are also configured in the mobile communication system in which the communication system of the 1S core network described as the ATM communication system is the IP communication. Thus, the same effect can be obtained.

(Example 2)

FIG. 5 is a diagram (2) for explaining the outline of the present invention. 301 and 311 are IP phones, 321 is a subscriber phone, 302, 312 and 322 are gateways (GW: gate way), and 320 is a PSTN. It is assumed that a large-scale disaster has occurred in area A. In addition, IP phone 311 in region B and subscriber phone 321 in region C communicate with IP phone 301 in region A where the disaster occurred. However, IP phone 301 is a collective term for IP phones that are in the area A where disasters occur, which is not possible with a single IP phone, and are under the control of GW302. [0054] The communication of the IP phone 311 is connected to the GW 312 as a G.711 signal. When GW312 determines that the IP phone 311-powered call is communication to a disaster area, the G.711 signal is a codec with a high compression rate. -telecommunication standardization sector; ¾0 o * G. 29, hereinafter referred to as G. 729.) Convert to signal and transfer. Similarly, the communication of the subscriber telephone 321 is connected to the GW 322 as an STM line signal via the PS TN 320. When the GW 322 determines that the call from the subscriber telephone 321 is communication to the disaster area, the GW 322 converts the STM line signal into a G. 729 signal, which is a codec with a high compression rate, and transfers it. Communication signals from region B and region C to region A are connected to IP phone 301 as G.729 signals via GW302.

[0055] Therefore, the signal processed by GW202 in area A is a G.729 signal that has been signal-compressed and the communication bandwidth has been reduced. Therefore, more call processing is possible compared to normal operation (when no disaster has occurred). It becomes possible to carry out.

FIG. 6 is a diagram (3) illustrating the system operation of the present invention, and 332 is a GW that manages the IP phone 311 and the PSTN 320. The other symbols are the same as in FIG. 5, and the IP phone 311 and the subscriber phone 321 communicate with the IP phone 301 in the area A where the disaster occurred. However, IP phone 301 is a general term for IP phones that are located in the area A where disasters occur, and are under the control of GW302, which is not possible with a single IP phone.

[0057] The system operation of the present invention will be described for each symbol in FIG.

[0058] (41) Call IP phone 301 in area A where the disaster occurred from subscriber phone 321. The communication signal from the subscriber phone 321 is connected to the GW 332 via the PSTN 320 as a 64 Kbit / sec signal of the STM line. Also, make a call from IP phone 311 to IP phone 301 in area A where the disaster occurred. The communication signal from IP phone 311 is connected to 0 ¹ \ ^ 332 as a G.711 signal. The disaster area communication discriminating means (not shown) of GW 332 analyzes the destination number and collates with the disaster area registration means (not shown) in which information indicating the disaster area is registered, and the communication signal is Determine if it is a communication signal to the affected area.

(42) As a result of the determination, if the communication signal is a communication signal to the disaster area, the route selection means (not shown) of GW332 is used as a call control protocol signal of the IP phone. In SIP (session initiation protocol), the above-mentioned INVITE signal is a call connection signal. Add a disaster area identifier indicating the result of determining whether the communication is to the disaster area

Transfer to GW. If the GW332 has a high compression function, the GW332 converts the G.711 signal, which is the communication signal, into a G.729 signal with a high compression rate, and communicates to the disaster area by compressing the signal into an INVITE signal. Add a disaster compression identifier to indicate that it is present and transfer it to another GW. The disaster compression identifier and the disaster area identifier can be configured in pairs.

[0060] (In (42), if the GW 332 does not have a high compression function, the GW 332 keeps the G.711 signal as the communication signal as it is, and the INVITE signal is uncompressed to the disaster area. Add disaster compression identifier indicating communication and transfer to other GW o)

(43) GW332 routes the communication signal compressed to G.729 signal to GW302 which is the other party.

(44) The GW 302 determines the received communication signal based on the disaster compression identifier and the disaster region identifier added to the INVITE signal, and is a communication to the disaster region and is an uncompressed signal. If the GW 302 has a high compression function, the G.711 signal as the communication signal is converted into a G.729 signal having a high compression rate and routed to the other party. If the communication is not to the disaster area, the signal is already compressed, or the GW 302 does not have a function of high compression, it is routed to the other party without conversion.

FIG. 7 is a diagram (2) for explaining the control processing of the system of the present invention. Communication is performed from the subscription telephone 321 and the IP telephone 311 described in FIG. 6 to the IP telephone 301 in the disaster area A. The system control processing in this case will be described for each sequence.

Sequence 51 (hereinafter referred to as S (51)): Subscriber telephone 321 makes a call.

[0064] S (52): PSTN 320 accommodating subscriber telephone 321 transfers an IAM signal, which is a common line signaling call control protocol signal, to GW 332, which has PSTN 320 under its control.

[0065] S (53): GW332 analyzes the other party.

[0066] S (54): The GW 332 collates with the disaster area registration unit in which the information indicating the disaster area is registered, and determines whether the destination is registered in the disaster area registration unit. (It is assumed that the result of discrimination has been registered.) S (51) -S (54) is the case where GW332 accepts outgoing calls from the subscriber phone, and S (61) -S (63) below is the case where GW332 accepts outgoing calls from IP phone 311.

[0067] S (61): When IP phone 311 makes a call, IP phone 311 uses the SIP call connection signal that is used as the IP phone call control protocol signal. . Transfer 711 signal to GW332.

[0068] S (62): GW332 analyzes the other party.

[0069] S (63): The disaster area communication discriminating means (not shown) of the GW 332 collates with the disaster area registration means in which information indicating the disaster area is registered, and the destination is the disaster area registration means. It is determined whether it is registered in (not shown). (It is assumed that the result of discrimination is registered.)

S (64): The route selection means (not shown) of GW332 determines whether the communication signal to the disaster area is the communication signal to the disaster area if the communication signal is the communication signal to the disaster area. The disaster area identifier indicating is added and transferred to GW302. If the GW332 has a high compression function, the GW332 converts the G.711 signal, which is the communication signal, into a G.729 signal with a high compression rate, and communicates to the disaster area by compressing the signal into an INVITE signal. Add a disaster compression identifier to indicate that it is transferred to another GW. If the GW332 does not have a function for high compression, the GW332 will continue to use the G.711 signal, which is the communication signal, as it is. Add another child and transfer to GW332. (Assumed that G.729 signal was used for transfer.)

S (65): The GW 302 determines the received communication signal based on the disaster compression identifier and disaster region identifier added to the INVITE signal, and if the communication signal is a communication to the disaster region and is an uncompressed signal, When the GW 302 has a function of performing high compression, the G.711 signal as the communication signal is converted into a G.729 signal having a high compression rate and routed to the IP telephone 301 which is the counterpart. If the communication is not to the disaster area, is a compressed signal, or does not have a high compression function in the GW 302, it is routed to the IP phone 301 that is the other party without conversion.

[0070] As described above, for communication signals whose destination is a disaster area, the GW before the communication signal is transferred to the GW in the disaster area should have a signal compression function. Compress to G.729 signal with high compression ratio. Therefore, one of the GW processing in the disaster area Therefore, the number of communication signals that can be processed can be increased and congestion can be suppressed.

In addition, the apparatus having the compression function described in the second embodiment has a decompression function according to the transmission direction of the communication signal.

Explanation of symbols

[0072] 61 Disaster area registration means

62 Disaster area communication method

63 Route selection means

101, 201 Mobile terminal (MS)

102, 202 Wireless base station equipment (BTS)

103, 203 Radio network controller (RNC)

104, 114, 124, 134, 204 LS floor mobile switch (L-MSC)

105, 115, 125, 135, 205 Multimedia signal processing equipment (MPE)

106, 116, 126, 206, 216, 226 GS Level Mobile Coupling (G-MSC)

107, 207 TS Floor Switch (T-MSC)

110, 120, 210, 220, 320 Public Switched Telephone Network (PSTN)

111, 121, 211, 221, 321 subscriber phone

301, 311 IP phone

302, 312, 322 gateway (GW)

Claims

The scope of the claims

[1] In a disaster area communication line acquisition system used in a mobile communication system with asynchronous transfer mode (ATM) communication as a core network,

Disaster area registration means for registering information identifying the disaster area;

A disaster area communication discriminating means for discriminating a communication signal to the disaster area based on the registration information of the disaster area registration means;

Based on the determination result of the disaster area communication determination means !, a route selection means for selecting a communication signal to the disaster area to a signal compression means having a signal compression function

A disaster area communication line capturing system characterized by comprising:

[2] In the signal compression means according to claim 1, after the communication signal to the disaster area selected by the route selection means is signal-compressed by the route selection means, the communication signal to the disaster area compressed by the signal is converted. A disaster area communication line acquisition system characterized by selecting a route to the route selection means.

[3] A communication signal includes the first identifier indicating the determination result of the disaster area communication determination unit according to claim 1 and the second identifier indicating the signal compression result of the signal compression unit according to claim 2. Disaster area communication line acquisition system characterized by adding.

[4] A disaster area communication line acquisition system, characterized in that, based on the first identifier and the second identifier according to claim 3, a communication signal to the disaster area is determined and signal compression is performed.

[5] The disaster area communication line acquisition system, wherein the signal compression function according to claim 1 converts an AAL1 signal into an AAL2 signal.

[6] For IP telephone systems using the Internet Protocol (IP) network,

Based on the determination result of the disaster area communication determination means !, signal compression means for compressing the communication signal to the disaster area, and

[7] A third identifier indicating a discrimination result of the disaster area communication discrimination means according to claim 6, and a claim A disaster area communication line acquisition system, wherein a fourth identifier indicating a signal compression result in the signal compression means according to item 6 is added to a communication signal.

[8] A disaster area communication line acquisition system, characterized in that a communication signal to a disaster area is discriminated based on the third identifier and the fourth identifier according to claim 7, and the signal is compressed.

[9] The disaster area communication line acquisition system, wherein the signal compression function according to claim 6 converts a G.711 signal into a G.729 signal.

[10] First and second conversion devices that compress communication signals, and communication signals compressed by the first conversion device are transmitted to the first radio base station device under the first conversion device. The communication signal transmitted to the mobile terminal via the second converter and compressed by the second converter is transmitted to the mobile terminal via the second radio base station device under the second converter A storage unit for storing area information;

When the first radio base station apparatus corresponds to the specific area in the area information, the first radio base station apparatus power is transmitted to the mobile terminal in the radio zone of the first radio base station apparatus A control unit that controls the communication signal to be compressed by the second conversion device;

A mobile communication system comprising:

[11] In the mobile communication system according to claim 10,

A gateway station power of a mobile communication system accessed by a communication terminal device that communicates with the mobile terminal in a radio zone of the first radio base station device; a second communication path length to the second conversion device; The mobile communication system characterized in that the first communication path length is shorter than the second communication path length in the first communication path length to the first conversion device.