TW582179B - Implementation of basic call setup transporting layer address and logical point in backward direction in cellular networks with separation of call control and bearer control - Google Patents

Abstract

The present invention relates to enabling and optimizing call setup in a telecommunication network with separated call control and bearer control, i.e., payload transmission. The separation of call control and payload transmission means that the signaling between control nodes like mobile services switching centres, GMSCs and TSCs takes a different route through the network than the payload. This enables the telecommunication network to perform an optimal routing for the payload, using a minimum of resources. Depending on the call case, originating call, terminating call, internal call or transit call, there are only one or maximally two media gateway necessary.

Description

582179 A7 ---- B7 V. Description of the invention (1) Background of the invention A traditional GSM (Global System for Mobile Communications) or UMTS (Universal Mobile #Service) core network user notification control and call control. The notification control refers to the transmission of path selection control signals via the transmission network and the use of necessary resources (retention, release, and setting). The call control refers to the transmission of user and service control signals. Consider, for example, the user status. In the existing Η-ISDN (Integrated Services Digital Network) implementation, the signal transmission and notification control systems are integrated with each other. . The user is directly connected to the control server, such as MSCs (Mobile Services Switching Center) and GMSCs (Gateway MSCs). ‘Here, the control nodes can make application logic for both signal transmission and user-to-face implementation. The present invention discusses the difference between call control and notification control. Summary of the Invention With regard to the implementation aspects of GSM and UMTS, the existing B new method separates the call control from the notification control. According to the present invention, which has separate call control and notification control, the following points are explained: transmission of the media gateway address, termination and, if possible, the selected reverse transmission encoder. This application software system has nothing to do with the selected transmission technology, such as STM, ATM, IP, etc. The transmission method of the call control and notification control signals is changed to achieve the purpose of optimizing the establishment of the user face to face. -4-This paper size is in accordance with China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling in this page) ^ 11 ^ · 丨 :: ---- Order— 丨 —丨 丨 Line. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs and printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs and printed by the Consumer Cooperatives of the Ministry of Economic Affairs. Use a single media gateway. Let the mobile service switching center and TS server have the opportunity to control multiple media gateways by configuring a PC (endpoint digital) for each media gateway in the control node. User-to-face routing for call setup can be significantly optimized. Regarding users of the supplementary services CFNREA, CFB, CFNRY, CFU, face-to-face routing can be significantly optimized. User-to-person routing for supplementary services CW, HOLD can be significantly optimized. As in IAM, optionally, a CODEC list is included, which is obtained after negotiation between the calling mobile service switching center MSC1 and the user device 1, and the terminal mobile service switching center MSC2 can negotiate with the user device 2 CODEC, whereby he can return a signal to the user device 1 via the mobile service switching center MSC1. Thereby, the user device 1 and the user device 2 can use the same CODEC, thereby avoiding the network CODEC and providing better quality. When CODEC is necessary in a network such as STM (Figure 7), an equivalent type of CODEC can be selected to provide the TFO function. The media gateway can be selected by the first control node. To this end, the user's face needs to be modified and does not need to be performed in advance. When a later call control server mobile service switching center MSC2 selects a different media gateway MGW2 and reports this to the first control server, it can connect a selected media gateway MGW1 to the outside. . The first pass-5- This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page) # Order --------- Line, 582179 A7 ----—____ B7_____ 5. Description of the invention (3) The control server can set up the user-facing side to the different media gateway MGW2. Allows conference call devices in the media gateway to poll. The different encoded speech streams of Jiang are combined into a single MPTY. With the help of the following specifications and illustrations, you can clearly understand other further functions and advantages of the present invention. Brief description of the diagrams Figure 1 is a block diagram illustrating the basic call setup from the user device to the user device, in which the media gateway address is transmitted in the reverse direction; Figure 2 is the basic description of the call to the user device Block diagram of call setup, where the media gateway address is transmitted in the reverse direction; Figure 3 is a block diagram illustrating the basic call setup for roaming calls to user devices in its PLMN, where the media gateway address is Reverse transmission; Figure 4 shows the basic call about the call from the GMSC to the ISDN code * and a block diagram of 'where the media gateway address is transmitted in the reverse direction; Figure 5 is a description of the issue from the user device Basic call setup block diagram of the call 'The call is in the GMSC and forwards to the user device, where the media gateway address is transmitted in the reverse direction; Figure 6 illustrates the media gateway, waiting and receiving The block diagram of the basic call setup for the call waiting for the call, in which the media gateway address is transmitted in the reverse direction; and Figure 7 is a description of the call stop on the roaming user device of the PLMN in its home station ' Basic communication of call stop at roaming user device of visitor PLMN-6- This paper size is applicable to Chinese National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling out this page} 0 Order --------- Line-Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 _ 1-B7 V. Description of the invention (4) The block diagram is set, where the address of the media gateway is in accordance with Reverse transmission. Description of the invention (Please read the notes on the back before filling this page) The invention relates to the establishment and optimization of call setup in a telecommunications network with separate call control and notification control. That is to establish a payload connection. The separate call control and payload transmission mean that the signal transmission between control nodes such as mobile service switching center, gateway mobile service switching center and transmission switching center, etc. The route is different from the payload. This allows the telecommunications network to consume the least amount of resources and perform optimal routing processing on a payload. Depending on the call conditions, for outgoing calls, incoming calls, intercom calls, or Is transfer Then, only one or at most two media gateways are required in the network. The present invention is particularly related to a method that includes transmitting the identification information of the selected media gateway in a reverse manner. In other words, the second One control node or another control node will select the media gateway according to the following methods:-call source;-call target (this item is for the selected terminal control node transmission switch or mobile service switching center, and for the code and Decoding is extremely important); or the services (such as voice, transmission, or other) printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy are the same in all cases. However, in some cases, further The information may be related to the selected result of the media gateway, such as: • Invoice Moon Good Service, i port CFB;-Payload encoding method (in the case of compressed speech, for keeping this paper size ^^ Time standard (_CNS) A4 specification (210 X 297 mm) 582179 A7 B7 V. Description of the invention ('The voice information printed by the Employee Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs will Based on the Internet in a compressed state is extremely sensitive, because thereby saves transmission capacity); - the call establishment information frame. The invention relates to the basic call setup 'GSM / UMTS supplementary services CFU, CFB, CFNREA, CFNRY, CW, HOLD, and MPTY, and transmits its transport layer data, logical points, and a cellular network with separate call control and notification control The implementation of various projects such as the selected coding type and the selected frame preparation type of the reverse way. The various call situations are used to clarify the call setup operation 'and to illustrate it by illustration. Each diagram is, for example, a block diagram of a wireless communication system such as a GSM or UMTS core network. It is attached with a control signal transmitted to each control server during the call setup for different traffic situations. Directional arrows with media gateways. In this text and these reference figures, a specific signal is identified by its reference number. Each call in the many traffic situations described in this article involves a fixed terminal or mobile terminal. Such terminals may be, for example, personal computers, transmitters or telephones located within the network. The mobile terminal is referred to herein as a "user device (U E)". User equipment can communicate with the network via an RNC (Radio Network Controller) using the "Radio Resource Control (RRC)" protocol. The logical point is a local reference generated by MGW (Media Gateway), and only the media gateway address can be used to identify the control server, such as msc / vlr (msc / visitor location register), GMSC, TSC connect with a connection in & RNC. For this reason, a certain logic point P in the first media gateway MGW1 is reserved. The reserved logical point will be responded in the DCp resource -8-

(Please read the notes on the back before filling out this page) 0 ----: ---- Order ----- I-- • Line ^ -ϊ I nnn · 582179 Printed by the Consumers ’Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs A7 invention description (The message is sent back to the control server, and the control server is passed to another media gateway MGW2 or RN C, and thus the AAL2 connection is established. In this setup step This logical point P will be included to identify what reserved resources should be established in the connection of the first media gateway MGW1. This logical point P is equivalent to the terminal used in the h.GCP standard standardized by the ITU The aforementioned control nodes, such as one of the control servers, can provide application logic. Strictly distinguishing the application logic from the user-to-face processing part can provide intensive application development and execution advantages. There are control nodes such as GMSC, MSC, TSC, and HLR (transmit signals only) in the above system. The interface of these control nodes may be, for example, N-ISUP for call control signal transmission, and media gateway control. DCP for m signal transmission, and A map of signals transmitted between servers, etc. The aforementioned control nodes, such as one of those control servers, can provide application logic. This application logic is strictly distinguished from the user-to-face processing part, which can provide dense Application development and implementation advantages. In the above system, there are control nodes such as GMSC, MSC, TSC, and HLR (transmit signals only). The interface of these control nodes can be, for example, N- ISUP, DCP for media gateway control signal transmission, and MAP for transmission of connectionless signal transmission between control servers, etc. Media gateway (MGW) can modify or exchange user-facing . He can perform such items as statement generation, dial tone generation, echo cancellation, data processing, C0DEC (Transmission Encoder) processing of voice calls, etc.-9-'Paper size applies Chinese national standard (cl ^ i) A4 specifications (21G χ 297 issued _ f Jing first read the> on the back and then fill in this page) · ---- r --- order --------- line 582179 A7 B7 V. Invention description (). The transmission gateway (GW) can perform notification of the signaling message talks. In the UMTS and ISDN networks with ATM core network, the interconnecting network from ATM / AAL5 to MIMO is connected to the signal transmission gateway. This signal transmission gateway can relay the N-ISUP signal and exchange the lower-level transmission layer that carries the control signal. Therefore, the signal transmission gateway GW will usually communicate with, for example, GMSC or The TSC servers are juxtaposed. The backbone network can transmit user-facing and control signals, and can be designed according to, for example, STM, ATM or IP. The media gateway is an edge node of the backbone network. (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. Except for many people in the industry, the following is the abbreviation AAL2 ATM adjustment layer used in this article. Type 2 ACM address complete information ATM Asynchronous Transfer Mode BICC Call Control CCD Conference Call Device CIC Circuit Identification Digital CFB Call Forward Busy Line CFNREA Call Forward Non Reachable CFNRY Call Forward No Response CFU Unconditional Call Forward CM Connection Management CPG Call Forward Message CW Call waiting supplementary service -10- Order --------- line. This paper size applies to Chinese National Standard (CNS) A4 (210 X 297 mm) 582179 A7 _B7 V. Description of the invention (8) Economy Ministry of Intellectual Property Bureau employee consumer cooperatives print DCP device control agreements, such as H.GCP DPC target point digital DTAP direct transmission application department GMSC gateway MSC HLR home location register HOLD call holding supplementary service IAM initial address Messaging IP Internet Protocol ISDN Integrated Services Digital Network ISUP ISDN User Division MAP Mobile Application Special Section MGW Media Gateway MSC Mobile Service Switching Center MPTY Multi-party supplementary service OPC Calling point Digital PC Endpoint Digital P Logical point RANAP Radio Proximity Network Application Specialist RNC Radio Network Controller SigGW Signal Transmission Gateway STM Synchronization Transmission Mode TSC Transmission Switching Center UE User Equipment (Mobile) In the new network architecture described in this article, N-ISDN is used as call control-11-(Please read the precautions on the back before filling this page) Order- ------- The paper size of the paper is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) 582179 Α7 Β7 5. For the description of invention (9), and STM, AAL2 or IP is used for Notification control and application provided to users face to face. How to generate the control dial tone will not be further described in this article, and it can be processed according to its »or I; it can be processed in I mode. The media gateway address can be transmitted to B1cc ISDN as, for example, a secondary Layer transport address is used. To find the address of the transmission switching center and / or the media gateway, certain IN services, routing analysis, or B-number analysis can be used. The transport switching center is then selected to place an outgoing call to ISDN. And according to the capacity of the call you want to process, such as what CODEC, encoding, compression, frame production method, etc.], declaration mechanism, dialer or modem, etc., click here to select the media gateway. For simplicity, only B-digital analysis is cited in this example. The selection method is mainly based on its goals. According to its goal, a set of media gateways with different capacities can be found. Then select the media gateway with the required capacity, such as CCDs, modem support, and Internet connectivity. All resources reserved by the server must be released by that server. However, in order to simplify the information flow, the release of the media gateway resource is not described here. This example assumes a one-to-one relationship between the first control node GMSC / TSC server in the core network (CN) and the first media gateway in the CN. · In order to be able to receive incoming calls on different media gateways, but still send the control signal (IA M) to the same gateway mobile service switching center, the gateway mobile service switching center and must Each media gateway has -12- This paper size is applicable to China National Standard (CNS) A4 specification (210 X 297 public love) (Please read the precautions on the back before filling this page) · 丨 丨 -L-- -Order · --III I--Line. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179

V. Description of the Invention (The Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs prints an endpoint number, and the ISDN user can be terminated here. Outside the DPC to which the I AM is sent, the gateway mobile service The switching center can be derived to the media gateway set up by the user of the ISDN. In order for a round-trip switching center to control more than one media gateway for outgoing (dial in) traffic, the The transmission switching center requires an endpoint number for each controlled media gateway. For a selected media gateway, the transmission parent switching center must use a certain OC. According to the selected OPC, the The transmission parent switch can be distinguished from the ISDN user-facing side received from different media gateways. Another alternative for different media gateways to receive or send the user-facing side is if the user If the area is routed to different media gateways, then different signal transmission routes are used between different servers. Another alternative is to use different media gateways to receive or send users to the media. 'Is If the user loops to the different media gateways, then different signal transmission routes are adopted between different servers. The third way is to direct the user to different media gateways. An alternative to receiving or sending to a transmission exchange, and controlling the transmission of signals between servers, is that if the user goes to the surface to different media gateways, then different CICs will It is applied to different media gateways. The OPC used in the IAM message is used to identify the speaking media gateway, instead of transmitting the concept that the media gateway address is in the IA M message. Standards are applicable to China National Standard (CNS) A4 specifications (210 X 297 public love) --------- · .1 Order-------- Line · (Please read the precautions on the back before filling (In this page) 582179 A7 B7 Printed invention description by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs (CN is also feasible, as shown in the case of media gateways, so it will require that each of these media gateways be controlled There should be m different endpoint numbers in the control server. An alternative solution for transmitting information from one server to another server is to use different signal transmission routes if the user goes to the surface to different media gateways. If The transmission switching center can receive call calls from m media gateways, then m different ## transmission routes are needed to point to the radio network controllers. Various signals are used in the attached drawings. Names. Some of them are still according to their traditional nature. DTAP messages are defined in GSM 04.08 V8.0.0 and UMTS 24.08 V3.0.0. RANAP messages are defined in UMTS 25.413 V1.0.2. MAP messages are defined in GSM 09.02 V6.3.0 and UMTS 29.002. V3.3.2. According to the present invention, the AAL2 message is controlled as a notification. The DCP message is used for communication between control nodes and media gateways related to resource requests and assignments, and will be described in detail later. ISDN messages are used for signal transmission between each network control node and the external ISDN network. Figure 1 shows a diagram from user device to user device, where the media gateway address is transmitted in the reverse direction. Here, although the call is initiated by a first control node mobile service switching center MSC1, the media gateway MGW1 is still selected by another second control node mobile service switching center MSC2. Then, the address of the media gateway MGW1 and a logical point, together with ISUP ACM / CPG / APM or some new information, are transmitted back to the calling mobile service switching center MSC1 in a reverse manner. The action service-14- This paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) ------------------ r --- order- ------- line (please read the notes on the back before filling this page) 582179 A7 B7 V. Description of the invention () The switching center MSC2 can negotiate a CODEC with a user device B, and transfer the CODEC type. To user device A. This eliminates the need for a CODEC at the media gateway MGW1. In this way, better speech quality can be provided by avoiding transmission coding. At the same time, less transmission capacity is required for transmitting the encoded voice ', and the CODEC hardware can be omitted. The mobile services switching center MSC1 will then order RNC1 to set up the user's face-to-face connection to the media gateway MGW1, and order the connection. After that, the mobile service switching center MSC2 will also order RNC2 to set up the user's face-to-face connection to the media closet MGW1. Therefore, only one media gateway is required for this traffic example. The following signals are applied to the traffic example shown in Figure 1. 1. DTAP, CM service request 2. DTAP, Setup (CODEC (x, y, z)) 3. DTAP, Call Proceeding 4. ISDN, IAM (OPC, DPC, CIC, CODEC (x, y)) call settings It is requested by the calling mobile service switching center MSC1 for the CODEC (X'y) used. 5 · MAP, SendRouting Information request The gateway 4 GMSC1 will ask the home address register HLR for routing information. Sent to 6. MAP, SendRouting Information response. If the caller has notified the message, GMSC1 in the gateway mobile service exchange 1 will receive the forward code and its content. 7 · ISDN, Address Complete Message (ACM) The AC Ｍ Xin Xin-15- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) Order --------- Line _ · Printed by the Employees 'Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 B7 13 V. Description of the invention () Acted by the gateway The service switching center GMSC1 is sent to the mobile service switching center MSC1. 8. ISDN, Initial Address Message IAM (OPC, DPC, CIC) The IAM message will be sent by the gateway mobile service switching center GMSC 1 to the mobile service switching center MSC2. 9. RANAP, Paging 10. DTAP, Paging Response 1 1. DTAP, Setup (CODEC (x, y)) 12. DTAP, Call confirmed (CODEC (x)) 1 3 · DCP, resource request (MGW1, CIC) This The mobile service switching center MSC2 selects the media gateway MGW1 and requests resources. 14. DCP, resource response (Pil, Pvll) will reply an entry point Pi2 by the media gateway MGW1. 15 · DCP, Through Connect (Pvll, Pil) The mobile service switching center MSC2 orders the media gateway MGW1 to reversely connect the virtual point Pvll and the entry point Pil. In N-ISUP, the speaking switch is used to perform the reverse operation through the connection. 1 6 · DCP, resource request (MGW1, Pvl 1) resources are requested for outgoing traffic. 1 7. DCP, resource response (Pol) Reply to a connection point Pol from the media gateway MGW1. 18. RANAP, Assignment Request 19. AAL2, Establish Request 20. AAL2, Establish confirm -16-This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the notes on the back before filling (This page) ----- r --- Order ------ Line. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 _B7_ 14 V. Description of Invention () 2 1. RANAP, Assignment Response 22. ISUP, new APM (MGW1, Pil) 23 · ISUP, new APM (MGW1, Pil) 24. DTAP, Progress Message (CODEC (x)) 25. RANAP, Assignment Request is assigned to the media gateway MGW1 〇26. AAL2 , Establish Request 27. AAL2, Establish confirm 2 8. RANAP, Assignment Response 29. DTAP, Alert

3 0. ISDN, Address Complete Message ACM 3 1. ISDN, Call Proceeding CPG 32. DTAP, Connect 33. DTAP, Connect ack 3 4. DCP, Through connect (Pvl 1, Po 1) The mobile service switching center MSC2 orders the The media gateway MGW1 connects the virtual point Pvl 1 and the outgoing point Pol. 3 5 · DCP, Through connect (Pvl 1, Pil) The mobile service switching center MSC2 orders the media gateway MGW1 to connect the entry point Pil and the virtual point Pvll bidirectionally.

3 6. ISUP, Answer Message ANM 3 7. ISUP, Answer Message ANM 3 8. DTAP, Connect 3 9. DTAP, Connect ACK -17- This paper size applies to China National Standard (CNS) A4 (210 x 297 mm) ) (Please read the notes on the back before filling out this page) ----- r --- Order --------- line- 582179 Printed by the Consumers ’Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the Invention (is) FIG. 2 shows a call sent by a user device to the outside of the network. The media gateway address is transmitted in a reverse manner. Here, a user B is calling a user device A that has been servoed. It is assumed that the external N-ISUP does not support the new ISUP reverse message APM. 1. ISDN (Initial Address Message IAM (OPC, DPC, CIC)) A call attempt from an external ISDN network to a mobile terminal requests the establishment of a call. This example is configured with the GMSC1 / TSC and "Signal Gateway SigGwl". 2. DCP, resource request (MGW1, CICil) is selected by Media Gateway II MGW1 for the resources requested by the call identified by its CIC via the ISDN network. 3. DCP, resource response (Pi 1, Pvl 1) The media gateway MGW1 responds to the entry point Pil and the virtual point Pvll. 4. MAP, SendRouting Information request The gateway mobile service switching center GMSC1 will query the home address register H L R for routing information. 5. MAP, SendRouting Information response The gateway mobile service switching center GMSC 1 received the mobile service switching center MSC address ° 6. ISDN, Address Complete Message (ACM) The ACM message will be exchanged by the gateway mobile service The center GMSC 1 is sent to transport exchange 1. 7. Optional DCP, Through connect (Pi 1, Pvl 1) The gateway mobile service switching center GMSC 1 orders the media gateway MGW1 to be connected. -18- This paper standard applies to China National Standard (CNS) A4 specifications (210 X 297 mm) ------------— I—Order · — 丨 —Line (Please read the precautions on the back before filling out this page) Printed by the Employees ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 _B7_ 5. Description of the invention (16) The entry point Pil is connected to the virtual point Pvll. You can choose to borrow a DCP, Through connect (Pil, Pol) message to connect the entire media gateway MGW1. 8. ISDN, IAM (OPC, DPC, CIC, CODEC (X, y)) The IAM information will be sent by the gateway mobile service switching center GMSC1 to the mobile service switching center MSC. The mobile service switching center MSC will select a media gateway MGW2. 9. RANAP, Paging 10. DTAP, Paging Response 1 1 DTAP, Setup (CODEC (x, y)) 12. DTAP? Call confirmed (CODEC (x)) 13, DCP, resource request (MGW2) This media gateway The MGW2 requests resources for the call identified by the CIC. 14. DCP, resource response (Pil, Pv21) will be returned by the media gateway MGW2 with an entry point Pi2 and a virtual point Pv21. 1 5. ISUP, new APM (MGW2, Pi2? CODEC x) 16. DCP, Setup connection (MGW1, MGW2, Pvll, Pi2) The gateway mobile service switching center GMSC1 requests a connection call identified by the virtual CIC Resources, and instruct the media gateway MGW1 to establish a connection toward Pi 2 in the media gateway MGW2. 1 7. AAL2, Establish Request 1 8. AAL2, Establish confirm 19.DCP, Setup connection response (Po 1) The media gateway MGW1 sends back a signal indicating that the outgoing connection has indeed been successfully established and passed -19- This paper size applies to Chinese National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) Order --------- Line: 582179 A7 B7 V. Invention Explanation (1) Go back to the consecutive point P ο 1. (Please read the notes on the back before filling in this page) 2 0. DCP, Through connect (Po 1, Pvl 1) The gateway mobile service switching center GMSC1 orders the media gateway MGW1 to connect to the connection point Pol and virtual points Pvll. You can choose to borrow a DCP, Through connect (Pil, Pol) message to connect the entire media gateway MGW1. 21. Optional DCP, Through connect (Pi2, Pv21) The mobile service switching center MS C commands the media gateway MGW2 to connect the entry point Pil and the virtual point Pv21. 2 2 · DCP, resource request (MGW2, Pv21) requests resources for external traffic. 2 3 · DCP, resource response (Po2) responds from the media gateway MGW2 to enter point P02. 24. RANAP, Assignment Request 25. AAL2, Establish Request 2 6. AAL2, Establish confirm 27. RANAP, Assignment Response 28. DTAP, Alert

29. ISDN, Address Complete Message ACM Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economy 3 0. ISDN, Call Proceeding CPG 3 1. DTAP, Connect 32. DTAP, Connect ack 3 3. DCP, Through connect (Po2, Pv21) The mobile service switching center MSC ordered the media gateway MGW2 to connect the connection point Po2 and the virtual -20- This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 582179 Intellectual Property Bureau of the Ministry of Economic Affairs Printed by employee consumer cooperatives A7 B7___ 18 V. Description of invention () Point Pv21. You can choose to borrow a DCP, Through connect (Pi2, Po2) message to connect the entire media gateway MGW2.

3 4. ISUP, Answer Message ANM 35. ISUP, Answer Message ANM Figure 3 illustrates the roaming call to the user device in its PLMN, and the media gateway address is transmitted in the reverse direction. It is assumed that the external N-ISUP does not support the new ISUP reverse message APM. The transmission encoder link is optional. It is not necessary to link the transmission encoder with an uncompressed voice to still transmit the voice. 1. ISDN (Initial Address Message IAM (OPC, DPC, CIC)) A call attempt from an external ISDN network to a mobile terminal requests the establishment of a call. In this example, the gateway mobile service switching center / transmission switching center, namely GMSC / TSC1, and "Signal Gateway SigGwl" 〇2. MAP, SendRouting Information request The gateway mobile service switching center GMSC / TSC1 will ask HLR for address information. 3. MAP, SendRouting Information response The gateway mobile service switching center GMSC / TSC1 received the roaming number of the mobile service switching center outside the PLMN. The roaming number received by the home address register HLR will be analyzed, and it can be received by the transmission switching center in the B-number analysis. 4. DCP, resource request (MGW1, CIC) The media gateway MGW1 requests the resources identified by the CIC for the call by ISDN. 21-This paper standard applies the Chinese National Standard (CNS) A4 specification (210 X 297 (Mm) (Please read the precautions on the back before filling out this page) ----- r --- Order --------- Line Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 B7 19 V. Description of the invention () The selected one of the transmission exchange of the route 1. 5. DCP, resource response (Pil, Pvl 1) will be returned by the media gateway MGW1 an entry point Pil and a virtual point Pvll. 6. ISDN, Address Complete Message ACM sends the ACM message from the gateway mobile service switching center GMSC / TSC1 to the transport exchange 1 ° 7. DCP, Through connect (Pil, Pvll) The gateway mobile service switching center GMSC / TSC1 instructs the media gateway MGW1 to switch on the entry point Pil and the virtual point Pvl1. You can choose to borrow a DCP, Through connect (Pil, Pol) message to connect the entire media gateway MGW1. 8. ISDN, IAM (OPC, DPC, CIC, optional CODEC (X, y)) The IAM message will be sent by the gateway mobile service switching center GMSC / TSC1 to the transmission switching center TSC2. The transmission switching center TSC2 will select a media gateway MGW2. 9 DCP, resource request (MGW2) The transmission switching center TSC2 requests resources from the media gateway MGW2 for a call identified by the CIC. 1 0 · DCP, resource response (Pi2, Pv21) will be returned by the media gateway MGW2 with an entry point P i 2 and a virtual point Pv21. 1 1. ISUP, new APM (MGW2, Pi2, optional CODEC (x)) 12. DCP, Setup Connection (MGW1, MGW2, Pvll, Pi2) The gateway mobile service switching center GMSC / TSC1 pair is identified by the virtual CIC To make a call request resource and order the media gateway MGW1 -22- This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) ------------- ----: --- Order · ------ 丨 (Please read the precautions on the back before filling this page) 582179 A7 B7 20 V. Description of the invention () Toward the media gateway MGW2 P i 2 establishes a connection. 13. AAL2, Establish Request 14. AAL2, Establish confirm 15 DCP, Setup Connection response (Pol) The media gateway MGW1 sends back a signal indicating that the outgoing connection has been successfully established and returns a outgoing point Pol. 16 DCP, Through connect (Pol, Pvl 1) The gateway mobile service switching center GMSC / TSC1 orders the media gateway MGW1 to connect the connection point Pol and the virtual point Pvll. You can choose to link CODEC X to the link. 17. DCP, Through connect (Pi2, Pv21) The transmission switching center TSC2 commands the media gateway MGW2 to connect the entry point Pi2 and the virtual point Pv21. 1 8 · DCP, Setup connection (MGW2, Pv21) The transmission switching center TSC2 requests resources for the outgoing call identified by the virtual CIC, and instructs the media gateway MGW2 to establish a connection toward the transmission switching center TSC2. 1 9 · DCP, Setup Connection response (Po2, CIC) The media gateway MGW2 sends a signal indicating that the outgoing connection has indeed been successfully established and returns a outgoing point Po2. 20. DCP, Through connect (Po2, Pv21) The transmission switching center TSC2 orders the media gateway MGW2 to connect the connection point P02 and the virtual point Pv21. 2 1. ISDN, Initial Address Message IAM (OPC, DPC, CIC) The -23- This paper size applies to China National Standard (CNS) A4 (210 χ 297 mm) (Please read the precautions on the back before filling in this (Page) ----- r --- Order --------- Line _ Printed by the Employees 'Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 B7 21 V. Inventions Explanation () The IAM message will be transmitted from TSC2 to T2.

22. ISDN, Address Complete Message ACM

23. ISDN, Call Proceeding CPG

24. ISDN, Call Proceeding CFG

25. ISUP, Answer Message ANM 2 6. ISUP, Answer Message ANM The ANM message will pass through the transmission switching center TSC2. 2 7. ISDN, Answer ANM The ANM message will pass through the gateway mobile service switching center GMSC / TSC1. Figure 4 shows an example of pre-call transmission from the gateway mobile service switching center GMSC / TSC1 to an ISDN user identified by the ISDN code, where the media gateway address is transmitted in the reverse direction. For CFNREA in the mobile service switching center, the same processing method as CFNREA in the gateway mobile service switching center GMSC / TSC1 can be applied. Therefore, only the CFNREA signal transmission in the GMSC will be described later. It is assumed that the external N-ISUP does not support the new ISUP reverse message APM. The inward linking of the transmission encoder is optional. There is no need to link inward with a transmission encoder for uncompressed speech and still be able to transmit speech. 1. ISDN (Initial Address Message IAM (OPC, DPC, CIC)) An external ISDN network attempts to establish a call from a mobile terminal. This example is configured with the gateway mobile service switching center / transmission switching center, namely GMSC / TSC1, and "Signal Gateway SigGwl" 0 2. MAP, SendRouting Information request The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this r) # Order --------- line. 582179 Intellectual Property Bureau, Ministry of Economic Affairs Printed by employees' consumer cooperatives A7 B7 22 V. Description of the invention () The service switching center GMSC / TSC1 will inquire about the address register HLR of this home for routing information. 3. MAP, SendRouting Information response If a notification message is required to be sent to the calling end, the gateway mobile service switching center GMSC / TSC1 will receive the forward number and instructions. The preamble number received by the HLR of the home address register will be analyzed, and the transmission switching center TSC2 can be received in the B-number analysis. 4. DCP, resource request (MGW1, CIC) The media gateway MGW1 selects the incoming call request resource identified by the CIC by the ISDN network's transmission exchange 1. 5. DCP, resource response (Pil, Pvl 1) will be returned by the media gateway MGW1 with an entry point Pil and a virtual point Pvll. 6. ISDN, Address Complete Message ACM sends the ACM message from the gateway mobile service switching center GMSC / TSC1 to transport exchange 1. The ACM message may include an out-of-band notification message. In this way, signal transmission can be saved, and the declaration mechanism can be transmitted inwardly or outwardly to the user and face to face. 7. Optional DCP, Connection announcement machine (Pil) Optionally, if an in-band notification message is required, the announcement mechanism can be connected. 8. Optional DCP, Disconnection announcement machine (Pil): After the notification, the announcement mechanism is disconnected. 9. DCP, Through connect (Pil, Pvl 1) The gateway mobile service switching center GMSC / TSC1 orders the media gateway MGW1 to connect to the -25- This paper standard applies to China National Standard (CNS) A4 specifications ( 210 X 297 mm) (Please read the notes on the back before filling out this page) -----; ---- Order- 丨 丨 —— 丨 ― 丨 · 582179 A7 B7 V. Description of the invention (23) Out point Pil and virtual point Pvll. 10. ISDN, IAM (OPC, DPC, CIC, optional CODEC (x, y)) The IAM message will be sent by the gateway mobile service switching center GMSC / TSC1 to the transmission switching center TSC2. The transmission switching center TSC2 will select a media gateway MGW2 and an optional CODEC X. 1 1 · DCP, resource request (MGW2) The media gateway MGW2 requests resources for a call identified by the CIC. 12. DCP, resource response (Pi2, Pv21) will be returned by the media gateway MGW2 with an entry point P i 2 and a virtual point Pv21. 1 3. ISUP, new APM (MGW2? Pi2? Optional CODEC (x)) 14. DCP, Setup connection (MGW1, MGW2, Pvll, Pi2) The gateway mobile service switching center GMSC / TSC1 pair is identified by the virtual CIC The connected call requests resources and instructs the media gateway MGW1 to establish a connection toward Pi2 in the media gateway MGW2. 1 5. AAL2, Establish Request 16. AAL2, Establish confirm 17. DCP, Setup Connection response (Pol) The media gateway MGW1 sends back a signal indicating that the outgoing connection has been successfully established and returns a outgoing point P ο 1. 1 8. DCP, Through connect (Po 1, Pvl 1) The gateway mobile service switching center GMSC / TSC1 commands the media gateway MGW1 to connect the connection point Pol and the virtual point Pvll. You can choose to link CODEC X to the link. 19. DCP, Through connect (Pi2, Pv21) The transmission exchange center-26- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) Order --------- Line 1 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 B7____ 5. Description of the invention (24) TSC2 orders the media gateway MGW2 To switch on the entry point Pi2 and the virtual point Pv2 1. 2 0. DCP, Setup connection (MGW2, Pv21) The transmission switching center TSC2 requests resources for the outgoing call identified by the virtual CIC, and instructs the media gateway MGW2 to establish a connection toward the transmission switching 2. 2 1. DCP, Setup Connection response (Po2, CIC) The media gateway MGW2 sends a signal indicating that the outgoing connection has been successfully established ’and returns a outgoing point P 02. 2 2. DCP, Through connect (Po2, Pv21) The transmission switching center TSC2 commands the media gateway MGW2 to connect the connection point P02 and the virtual point Pv21. Optional connection of CODECx to the link. 23. ISDN, Initial Address Message IAM (OPC, DPC, CIC) # The IAM message will be transmitted from TSC2 to T2.

24. ISDN, Address Complete Message ACM

25. ISDN, Call Proceeding CPG

26. ISDN, Call Proceeding CPG

27. ISDN, Answer Message ANM 28. ISDN, Answer Message ANM The ANM message will pass through the transmission switching center TSC2. 29. ISDN, Answer ANM The ANM message will pass through the GMSC / TSC1.

Fig. 5 is a diagram illustrating a call example from a user device in a GMSC with call forwarding to a user identified by the user device code, wherein the media gateway address is transmitted in the reverse direction. In this example, the user device A -27- ___ This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) ------------------- -Order --------- line (please read the notes on the back before filling this page) 582179 A7 _ ^ _ B7_ 25 V. Description of the invention () Call user device B. When the user device B cannot be accessed, a CFNREA with a notification function is started in the gateway mobile service switching center GMSC1. This front pass transfer is completed via the third-party user device C. Therefore, the call will be routed to the gateway mobile service switching center GMSC2, and then he will contact the mobile service switching center MSC2, where the user device C can be located. Then, the mobile service switching center MSC2 selects the media gateway MGW2, and then returns to the mobile service switching center MSC1 from there. Then, the mobile service switching center MSC1 instructs RNC1 to establish a connection to the media gateway MGW2. Regarding the subsequent forward transfer to the user device in the GMSC, here, it is not through the gateway mobile service switching center GMSC2, but must include the gateway mobile service switching center GMSC2, and the gateway mobile service Switching Center GMSC3. When the mobile service switching center MSC1 has transmitted the CODEC table J to the mobile month good service switching center MSC2, the mobile service switching center MSC2 will negotiate with the user device B to select a codec from the list and Reciprocate it. Then, the user device A must use the CODEC, and at the same time, there is no need to perform any coding operation on the network. In this example, the claim mechanism uses CODEC X, and user device C uses CODEC y. 1. DTAP, CM service request 2. DTAP, Setup (CODEC (x, y)) 3. DTAP, Call Proceeding 4. ISDN, IAM (OPC, DPC, CIC, CODEC (x, y)) by the calling mobile service The switching center MSC 1 requests the establishment of a call. -28- This paper size applies to Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the notes on the back before filling this page) Order ---------- Line, Ministry of Economic Affairs Printed by the Intellectual Property Bureau employee consumer cooperative 582179 A7 B7 V. Description of the invention ('26 5. MAP, SendRouting Information request ^ The service exchange center GMSC1 will inquire about the address register HLR of this home office and the Intellectual Property Bureau of the Ministry of Economic Affairs The information is printed by the employee's consumer cooperative..., MAP needs to send a message 6. MAP, SendRouting Information response w ^ ^ # #German Center will provide a notification message, then the gateway mobile service x GMSC1 will receive the preamble number and instructions. 7. DCP, resource request (MGW1, CIC) the media ^ MGW1 requests resources for the call identified by the CIC. # YV 道 器 8. DCP, resource response (Pil, Pvl 1) will reply to an entry point by the media MGW1 Pil and virtual point Pvll. 9. ISUP, new APM (MGW1, Pil, CODEC x) need to be informed, so the gateway mobile service switching center GMSC1 chooses MGW1 and CODEC X. 10. DTAP, Progress (CODEC x) 1 1. RANAP, Assignmen t Request (MGW1, Pil) 12. AAL2, Establish Request 13. AAL2, Establish Confirm 1 4. RANAP, Assignment Response 1 5. ISDN, Address Complete Message ACM The ACM message is sent by the gateway mobile service switching center GMSC1 To the mobile service switching center MSC1. The ACM message may include an out-of-band notification message. This saves signal transmission, the declaration mechanism is inward, or the link is transmitted with the user face to face. 16. DCP, Connection announcement machine (Pil) If you need frequency 29- This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page > ----- ^- --Order --------- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 ______B7_ Heart 27 V. Description of the Invention () In-band notification information can be connected to this declaration mechanism. 1 7. DCP, Disconnect announcement machine (Pil), after the notification has been made, the announcement mechanism is disconnected. 18. ISDN, IAM (OPC, DPC, CIC, CODEC (X, y)) The IAM message will be sent from the gateway mobile service switching center GMSC1 to the gateway mobile service switching center GMSC2. 1 9. MAP, SendRouting Information request The gateway mobile service switching center GMSC2 will inquire about the home address register HLR for routing information. 2 0. MAP, SendRouting Information response The gateway action service switching center GMSC2 will receive the MS address from the home address register HLR. 2 1. ISDN, IAM (OPC, DPC, CIC, CODEC (X, y)) The IAM message will be sent by the gateway mobile service switching center GMSC2 to the mobile service switching center MSC2. The mobile service switching center MSC2 will select the media gateway MGW2. 22. RANAP, Paging 2 3. DTAP, Paging Response 24. DTAP, Setup (CODEC (x, y)) 25. DTAP, Call confirmed (CODEC y) 2 6. DCP, resource request (MGW2, CIC) The router MGW2 requests resources for the call identified by the CIC. 27. DCP, resource response (Pi2, Pv21) will reply to an entry point P i 1 by the media gateway MGW2. -30- This paper size applies to Chinese National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) · # Order ---------- Line ^ Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 B7 Heart 28 V. Description of the invention () 2 8. DCP, Through connect (Pv21, Pi2) The mobile service exchange center MSC2 instructs the media gateway MGW2 to reversely connect Virtual point Pv21 and entry point Pi2. In N-ISUP, the call exchange is reversed. 2 9. DCP, resource request (MGW1, Pv21) requests resources for outgoing traffic. 3 0. DCP, resource response (Pi2, Pv21) The media gateway MGW2 will reply with a connection point P i 2. 3 1. RANAP, Assignment Request 3 2. AAL2, Establish Request 33. AAL2, Establish confirm 3 4. RANAP, Assignment Response 3 5. ISUP, new APM (MGW2, Pi2, CODEC y) 3 6. ISUP, new APM ( MGW2, Pi2, CODEC y) 3 7. ISUP, new APM (MGW2, Pi2, CODEC y) 3 8. RANAP, Assignment Request will subsequently assign the media gateway MGW2. This will also release the connection from RNC1 to the media gateway MGW1. 3 9. DTAP, Progress (CODEC x) 40. AAL2, Establish Request 4 1. AAL2, Establish confirm 42. RANAP, Assignment Response 43. DTAP Alert

44. ISDN, Address Complete Message ACM -31-This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) < Please read the precautions on the back before filling this page) Order ----- ---- Line: Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 _B7_ V. Description of Invention (29)

45. ISDN, Call Proceeding CPG 46. ISDN, Call Proceeding CPG 4 7. DTAP, Alerting 4 8. DTAP, Connect 49. DTAP, Connect ack 50. DCP, Through connect (Pv21, Pi2) The mobile service switching center MSC2 commands The media gateway MGW2 connects the entry point Pi2 and the virtual point Pv21 in both directions. 5 1 · DCP, Through connect (Pv21, Po2) The mobile service switching center MSC2 instructs the media gateway MGW2 to bidirectionally connect the virtual point Pv21 and the entry point Po2. Optionally, a DCP, Through connect (Pi2, Po2) message is used to connect the media gateway MGW2.

52. ISUP, Answer Complete Message ANM 5 3. ISUP? Answer Complete Message ANM

54. ISUP, Answer Complete Message ANM 55. DTAP, Connect

5 6. DTAP, Connect ACK, and Figure 6 are illustrations of waiting for and receiving a waiting call in a media gateway, and the media gateway address is transmitted in the reverse direction. Here, user A calls a user device B that has been servoed, and he may have supplementary services C W and HOLD. After the call from the user A to the user device B is started, another call from the user C on the media gateway MGW2 is transmitted to the terminal of the user device B. The user device B accepts the waiting call of the user C, and therefore the call from A must be temporarily suspended -32- This paper size applies to China National Standard (CNS) A4 ^ (210 X 297 mm) (please first Read the notes on the back and fill in this page) Order --------- Winter A7 ---------- B7 _ Heart 30 '' --------- V. Invention Instructions () (Please read the notes on the back before filling this page) The user who talks from user A to user device B will be contacted by the media gateway MGW1, _ to the media closer mgw2, and the user (B) of user device B will be informed by the media. The idler Yangbao goes around to the media idler MGW2 1 The media asker MGW2 can provide CCDs. After the device B accepts the waiting call, the mobile service switching center MSC commands the media wideband device MGW2 to switch from the previous active call to the waiting word. The active call is currently on hold. It is assumed here that the active call and the waiting call both call the same service item, such as having the same coDEC voice, in order to reuse the AAL2 connection between the radio network controller RNC and the media gateway mgwi. line. In this way, the purpose of fast switching between the active call and the held call can be achieved. At the same time, if you want to make a multi-party call later, you only need to connect a conference call device at the media gateway MGW2. For this traffic situation, this mechanism will require three instead of just two media gateways. If user C is a mobile user of the network, only two media gateways are needed, namely media gateway MGW1 and media gateway MGW2 ^ It is assumed that the external N-ISUP does not support the new lsup reverse message APM. If Bai wants to make a multi-party call later, a conference call device needs to be connected to the media gateway mgw]. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. At present, CCDs only support PCM coding. Therefore, when entering the stop, the same CodEc method as used for individual media gateways must be adopted, such as the CODEC on each call stop. X. Another method is to send an ISUP message such as APM to each gateway mobile service switching center gmSC / TSC to make it connect to the CODEC. -33- This paper size is in accordance with China National Standard (CNS) A4 (210 X 297 mm) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 B7 31 V. Description of the invention () 1. ISDN, Initial Address Message IAM (OPC, DPC, CIC) A call attempt from an external ISDN network to a mobile terminal requests to establish a call. In this example, the gateway mobile service switching center / transmission switching center, that is, GMSC1 / TSC1, and "signal transmission gateway 1 J ° 2 · DCP, resource request (MGW1, CIC) the media gateway MGW1 selects the incoming call request resource identified by the CIC, which is selected by the ISDN network's transmission exchange 1. 3. DCP, resource response (Pil, Pvl 1) will be returned by the media gateway MGW1 an entry point Pil and Virtual point Pvll. 4. MAP, SendRouting Information request The gateway mobile service switching center GMSC1 will ask the home address register HLR for routing information. 5. MAP, SendRouting Information response The gateway action

The service switching center GMSC1 will receive the MSC address of the mobile service switching center. 6. ISDN, Address Complete Message ACM sends the ACM message from the gateway mobile service switching center GMSC1 / TSC1 to the transport exchange 1 0 7. DCP, Through connect (Pil, Pvl 1) the gateway mobile service switching center GMSC1 / TSC1 commands the media gateway MGW1 to switch on the entry point Pil and the virtual point Pvll. 8. ISDN, IAM (OPC, DPC, CIC, CODEC (X, y)) The IAM message will be sent by the gateway mobile service switching center GMSC1 / TSC1 -34- This paper standard applies Chinese national standard (CNS ) A4 size (210 X 297 mm) ---------- I ----- r --- ^ --------- ^ (Please read the precautions on the back first (Fill in this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7-^ _ B7_ V. Description of Invention (32) To the Mobile Service Exchange Center MSC. The mobile service switching center MSC selects a media gateway MGW2. ^ RANAP, Paging l. DTAP, Paging Response 1 1, DTAP, Setup (CODEC (x, y)) 12. DTAP, Call, confirmed (CODEC x) 1 3 DCP, resource request (MGW2) the media gate The router MGW2 requests resources for the call identified by the CIC. 14. DCP, resource response (Pi2, Pv21) will be returned by the media gateway MGW2 with an entry point Pi2 and a virtual point Pv21. 15. ISUP, new APM (MGW2, Pi2, optional CODEC (x)) 16. DCP, Setup Connection (MGW1, MGW2, Pvll, Pi2) The gateway mobile service switching center GMSC1 / TSC1 is identified by the virtual CIC Connect the call request resource and order the media gateway MGW1 to establish a connection towards Pi2 in the media gateway MGW2. 17. AAL2, Establish Request 1 8. AAL2, Establish confirm 19. DCP, Setup Connection response (P0l) The media gateway MGW1 sends back a signal indicating that the outgoing connection has been successfully established and returns a outgoing connection. Point P ο 1. 20. DCP, Through connect (Pol, Pvll) The gateway mobile service switching center GMSC1 / TSC1 commands the media gateway MGW1 to connect the connection point Pol and the virtual point Pvll. 2 1 · DCP, Through connect (Pi2, Pv21) This mobile service exchange center -35- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling in this page)

582179 A7 B7 33 V. Explanation of the invention () The MSC instructs the media gateway MGW2 to switch on the entry point P i 2 and the virtual point Pv21. (Please read the notes on the back before filling out this page) 22. DCP, resource request (MGW2, Pv21) requests resources for outgoing calls. 2 3 · DCP, resource response (Po2) will be returned by the media gateway MGW2 to a connection point Po2. 2 4, RANAP, Assignment Request 25. AAL2, Establish Request 26. AAL2, Establish confirm 2 7. RANAP, Assignment Response 28. DTAP Alert

29. ISDN, Address Complete Message ACM

30. ISDN, Call Proceeding CPG 3 1. DTAP, Connect 3 2. DTAP, Connect ack 3 3. DCP, Through connect (Po2, Pv21) The mobile service switching center MSC instructs the media gateway MGW2 to connect and connect Point Po2 and virtual point Pv21. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

3 4. ISUP, Answer Message ANM 3 5. ISUP, Answer Message ANM 3 6. ISDN, Initial Address Message IAM (OPC, DPC, CIC) The external ISDN network attempts to establish a call with a mobile terminal. In this example, the gateway mobile service switching center / transmission switching center is configured, namely GMSC2 / TSC2, and "Signal Transmission Gateway -36- This paper standard applies to China National Standard (CNS) A4 Specification (210 X 297 (Mm) 582179 A7 B7 34 V. Description of the invention () 2 ". 3 7. DCP, resource request (MGW3, CIC) The media gateway MGW3 selects the incoming call request resource identified by the CIC as the one selected by the transmission exchange 2 of the ISDN network. 3 8. DCP, resource response (Pi3, Pv31) will be responded by the media gateway MGW3 with an entry point P i 3 and a virtual point Pv3 1. 3 9 · MAP, SendRouting Information request The mobile service switching center GMSC2 will ask the HLR of the home address register for routing information.

40. MAP, SendRouting Information response The gateway mobile service switching center GMSC2 will receive the mobile service switching center MSC address. 4 1. ISDN, Address Complete Message ACM sends the ACM message from the gateway mobile service switching center GMSC2 / TSC2 to transport exchange 2. 42. DCP, Through connect (Pi3, Pv31) The gateway mobile service switching center GMSC2 / TSC2 orders the media gateway MGW3 to connect the entry point 卩 3 and the virtual point? ¥ 31. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs (please read the notes on the back before filling this page) 43. ISDN, Initial Address Message IAM (OPC, DPC, CIC) The IAM message will be served by the gateway action The switching center GMSC2 / TSC2 is sent to the Mobile Services Switching Center MSC, which is controlling the media gateway MGW2. 44. DTAP, Setup (CODEC (x? Y)) 45. DTAP, Call confirmed (CODEC x) -37- This paper size applies to China National Standard (CNS) A4 (210 x 297 mm) Intellectual Property Bureau, Ministry of Economic Affairs Printed by Employee Consumer Cooperative 582179 A7 B7 V. Description of Invention (35) 46. DCP, resource request (MGW2) requests resources for incoming calls identified by CIC. 4 7. DCP, resource response (Pi22, Pv22) will be returned by the media gateway MGW2 with an entry point Pi 2 and a virtual point Pv21. 4 8. DTAP Alert

49. ISDN, Address Complete Message ACM 5 0. ISDN, Call Proceeding CPG 5 1. DTAP, HOLD (B)

5 2. DTAP, HOLD ACK 5 3. ISUP, Call Proceeding Message CPG (B held) 54. ISUP3 Call Proceeding Message CPG (B held) 5 5. ISUP, new APM (MGW2, Pi22, CODEC (x)) 5 6 . DCP, Setup connection (MGW3, MGW2, Pv31, Pi22) The gateway mobile service switching center GMSC2 / TSC2 requests resources for the outgoing call identified by the virtual CIC, and orders the media gateway MGW3 towards the media gateway. Pi22 in track device MGW2 establishes the connection. 5 7. AAL2, Establish Request 5 8. AAL2, Establish confirm 5 9. DCP, Setup connection response (Po3) The media gateway MGW3 sends back a signal indicating that the outgoing connection has been successfully established and returns a outgoing connection. Point P 03. 6 0 · DCP, Through connect (Po3, Pv3 1) The gateway mobile service switching center GMSC2 / TSC2 commands the media gateway MGW3 to connect the connection point Po3 and the virtual point Pv31. -38- ^ The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) " (Please read the precautions on the back before filling this page) Order --------- line one 582179 A7 B7, 36 V. Description of the invention (6) DCP, Through connect (Pi22, Pv22) The mobile service switching center MSC commands the media gateway MGW2 to connect the entry point Pi22 and the virtual point Pv22. 62. DCP, Disconnect (Po2, Pv22) 63. DTAP, Connect 64. DTAP, Connect ack 6 5 · DCP, Through connect (Pv22, Po2) The mobile service switching center MSC commands the media gateway MGW2 to connect to the virtual Point Pv22 is connected to point Po2. In this way, the existing users between the radio network controller RN C and the media gateway MGW2 will be connected to the users C user's side.

66. ISUP, Answer Message ANM

67. ISUP, Answer Message ANM Figure 7 shows a roaming user device at a PLMN in his home station stops talking to a roaming user device at a visitor PLMN, where the media gateway address is transmitted in the reverse direction. This example shows a first transmission network that includes a call received from a terminal, an ATM-type PLMN that implements the IAM / APM mechanism, and an STM-type ISUP network that implements the IAM / APM mechanism. The IAM / APM mechanism interoperates between PLMN and other units. Regarding the interviewed PLMN, the detailed content can refer to the description in Figure 2 of the previous disclosure. Similarly, for the details of the PLMN located on the right side of this figure, please refer to the description in Figure 3 of the previous release. Here, a user device B that has been servoed on transmission exchange 1 receives -39- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back first (Fill in this page again) Order --------- Printed by the Consumers 'Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 582179 A7 B7 37 V. Description of the invention () User A Biography Incoming call. Received the I AM message without a CODEC list, and TSC1 will add a CODEC list to the IAM, and forward the IAM to the gateway mobile service switching center GMSC / TSC1, and the other will Query the home location register HLR to obtain a mobile service switching center MSC address. The mobile service switching center MSC belongs to another PLMN and can only be accessed via the STM network. Therefore, the gateway mobile service switching center GMSC / TSC1 forwards the IAM message with the CODEC list to the transmission switching center TSC2, which is controlling the media gateway MGW2. The transmission switching center TSC2 is interoperating with a transmission STM network, and the network includes transmission switching 2 and transmission switching 3. The transmission network will forward the IAM received from the transmission switching center TSC2 together with the CODEC list to the transmission switching center TSC3. The transmission switching center TSC3 can reduce the list if they do not support all CODEC types. The transmission switching center TSC3 then forwards the IAM message with the CODEC list to the MSC. Here, the list can be sent to the user device in the setup message, and the user device will respond to a selected CODEC in the call confirmation message. The mobile service switching center MSC will then select a media gateway MGW4, and return the media gateway MGW4 address, logical entry point and selected CODEC type to the APM, and then back to the transmission switching center TSC3. The transmission switching center TSC3 sets up a user-facing surface between the media gateway MGW3 and the media gateway MGW4 and connects to the selected CODEC. The transmission switching center TSC3 returns the selected CODEC to the transmission switching center TSC2 in an APM message. The transmission switching center TSC2 is connected to the media gateway-40- This paper size is applicable to the national standard (CNS) A4 specification (210 X 297 mm) -----------_ | Order- -------- Line · < Please read the notes on the back before filling this page) 582179 A7 B7_, 38 V. Description of the invention () The selected CODEC in MGW2, and inform it by signal in APM Media gateway MGW2 address, logical entry point and selected CODEC type. The gateway mobile service switching center GMSC / TSC1 is connected to the CODEC, and the user gateway is set up from the media gateway MGW1 to the media gateway MGW2, and then it is clear that the user interface is set up to the transmission Exchange 1. Since all CODECs are of the same type, the CODEC in the media gateway MGW2 and the CODEC in the media gateway MGW3 can enter the TFO mode. In TFO mode, the CODEC can be transmitted, and the compressed CODEC voice can be transmitted to each other on the PCM network. Thereby, since the transmission coding can be ignored, the speech quality can be improved. The foregoing example describes a new method that can be implemented in GSM and UMTS core networks to separate call control and notification control, and the transport layer address and logical point are transmitted in a reverse manner. (Please read the notes on the back before filling out this page) ------ ^ ---- Order --------- line * Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy -41-This Paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Claims (1)

582179 Patent Application No. 089114352 g Replacement of Chinese patent application scope (August 1992) CS VI. Patent application scope amendment 1 · A method for setting up a call on a wireless communication network with separate call control and notification control, the call control is performed by a control node, and the notification control is performed by at least one media gateway, including ·· Receive a call setup request at the first control node; forward the call setup request from the first control node to subsequent control nodes, and if the call setup request comes from a control node at another network, then Selecting a media gateway and transmitting the address of the media gateway to the subsequent control node; receiving the call setup request at the subsequent control node; and selecting a media gateway at the subsequent control node And if at least one user needs to be refurbished and the media gateway needs to be switched, the media gateway address is transferred to the previous control node in a reverse manner. 2 · The method according to item 1 of the scope of patent application, wherein when the call establishment request is accepted, the subsequent control node becomes the control node in the expensive node, and further includes: selecting a medium in the expensive node. The gateway, and if at least one user needs to be refurbished, and the media gateway needs to be switched, the media gateway address is transferred to the previous media gateway in a reverse manner; and If the remote control node does not serve an end-user device, the child call setup request is forwarded to another subsequent control node. 3. If the method of applying for the item 1 or 2 of the patent scope, in which the paper size of the first control node is applicable (CNS) M specification T7ΐ〇 × 2; 97 mm), please request Patent Fanyuan 8 A BCD for action In service exchange, β, gateway mobile service exchange center and transfer exchange center. • If the method of applying for item No. 丨 or 2 includes transmitting a CODEC list provided by a calling user device to the end user device via the wireless communication network, the CODEC list is used for selection Payload trimming resources, and after selecting the resources, according to the selected shell source, the weekly trimming operation is performed. 5. The method according to item 4 of the scope of patent application, wherein the step of transmitting the codec list is included in the "start address message" and the list is sent. 6. The method according to item 1 or 2 of the patent application scope, further comprising the step of transmitting a selected CODEC type from the user device to the end user device. 7. If the method of claim 6 of the patent application scope further includes selecting another coDEc in response to the information about the selected CODEC type, to further perform transmission coding at the edge of the Kushiro road and at a user device, This eliminates the need for the Tandem Bureau to operate separately. 8. If the method of claim 6 of the scope of patent application, it further includes avoiding the network transmission coding operation required to respond to the information of the selected CODEC type. 9. If the method of the scope of patent application is applied, it further includes the step of transmitting a selected frame type over the entire network. 10 · The method of item i or 2 of the scope of the patent ##, wherein the media gateway selection step: further includes the previous control node to perform the undo operation of the media gateway selection, and the cancellation operation is based on Reverse way to lead back-2- This paper standard Itai ® ® Home Standard ((JNS) A4 specification (210X297 Public Love T M2179 A BCD, patent application park to these previous nodes.) 11 · If the scope of patent application is tenth The method of item 1, wherein the revocation operation of the media interrogator further includes that the control node will retransmit the CODEC list received by the control node to the end user device, and the first time the media gate operation status can be performed Selection, here, the coDEC list is used to select the resources used for trimming, and a selection operation can be adjusted later according to the selected resource. 12. For the method of applying for the scope of patent application, where The selection operation of revoking the media gateway also includes the operation of canceling the selection of the frame type, the encoding type and the address of the media gateway. 13. For the method of item i or 2 of the scope of patent application, where Including back At the request of a certain resource, a logical point reserved at the media gateway can be used to identify the logical point of the reserved resource in the media gateway, in order to process the call payload step. 14. If the scope of patent application is 1 or 2 The method, wherein the step of transmitting the media gateway address to the previous control nodes in a reverse manner further includes transmitting the logical point identification number to the first control node in a reverse manner. 15. A wireless communication network , Including: a plurality of control nodes, including a first control node and at least one other control node, and these control nodes receive information about a call, and one of the other control nodes may provide a plurality of media gateways ( (MGW) at least one media gateway to request resources to handle the user's face-to-face of the call; and -3- i Paper Standards ® ® Home Standard (CNS) A4 specification (210 X 297 mm) D8 application The scope of the patent includes at least one media gateway that contains multiple logical points to connect multiple media gateway resources that can handle the call to the user, and the at least one A media gateway is adapted to respond to a resource request from one of the other control nodes, and identifies one of the many logical points that points to the other control node. Here, the multiple control nodes "、 The accounting system uses at least one media gateway to handle the user's face-to-face conversation. 16. If the wireless communication network of the 15th patent application scope, one of the other technical nodes, The media gateway address can be transmitted in the reverse direction towards the previous control nodes. 17 · If the wireless communication network with the scope of patent application No. 15 or 16, one of the other control nodes can be clicked The identified logical point information of the media gateway is transmitted to the previous control nodes in a reverse manner. One of the at least one media gateway resource of the wireless communication network such as the scope of patent application No. 15 or 16 is a wheel encoder, a communication device, a modem, a dial tone generator, or a statement device. The wireless communication network with the scope of patent application No. 15 or 16 of Hanru. Among the communication between the control node and the media gateway, there is a communication about the internal assets of the media router. Performed. 2．If the wireless communication channel No. 15 or 16 of the scope of patent application is applied, the network adopts N-ISUP interface between control nodes ^ ', μ I beer for call control 4- This paper standard Applicable to China National Standard (CNS) A4 specification (210X297 public director) 21. ^ = The wireless communication network of item 15 or 16 of the patent scope, wherein the _ Θ plane is compressed and transmitted between and within the media gateways.絪 Mei has wireless communication for call control and notification control, and a method for setting up a call. The call control is implemented on the control node, and the child notification control is implemented on at least one media channel, including: Receive the call setup request at the Lang point; 接收 receive the transmission encoder list at the first control node; forward the call setup request and the transmission encoder list from the first control node to the subsequent control node; if at least one user When the surface needs to be trimmed, and the media gate needs to be switched, the media gateway address is transmitted to the previous control node in a reverse manner at the subsequent control node; and if the control node is If the end-user device is not servoed, the call setup request and the transmission encoder list are forwarded, and if a media gateway is already selected, the address of the selected media gateway is forwarded. Transfer to subsequent control nodes. -5-This paper size applies to China National Standard (CNS) A4 (210X 297 mm)