CN1241424C - Method for building transmission load supporting in general mobile communication system - Google Patents

Abstract

The invention relates to a method for establishing a transmission bearer in a Universal Mobile Telecommunications System (UMTS Universal Mobile Telecommunications System). Using the mapping relationship between the IP address of the MSC Mobile Services Switching Center and the ATM address of the MSC, when the MSC supporting IP transmission initiates a communication with the RNC Radio Network Controller (RNC Radio Network Controller) with ATM/IP dual stack When the transmission bearer between is set up, if the IP transmission resource of RNC is exhausted but the ATM transmission resource is still idle; then RNC is to establish the IP transmission bearer information provided by MSC for setting up the transmission bearer, and derives the ATM transmission bearer identification information through the mapping relationship, Furthermore, the idle ATM transmission resource is used to complete the establishment of the transmission bearer through the IWU and the MSC. Due to the adoption of the method for establishing the transmission bearer of the present invention, when the transmission bearer is established between the MSC supporting IP transmission and the RNC with ATM/IP dual stack, the idle ATM transmission resources can be used to complete the transmission bearer through the IWU and the MSC The establishment of the transmission bearer can be successfully completed.

Description

A method for establishing a transmission bearer in a universal mobile communication system

technical field

The invention relates to the field of mobile communications, in particular to a method for establishing a transmission bearer in a Universal Mobile Telecommunications System (UMTS Universal Mobile Telecommunications System).

technical background

UMTS (Universal Mobile Telecommunication Systems: Universal Mobile Communication System) is a third-generation mobile communication system using the WCDMA air interface. The UMTS system is also usually referred to as the WCDMA communication system. The UMTS system uses the same structure as the second generation mobile communication system, which includes some logical network elements. Different network units can be grouped functionally or from different subnetworks (Subnetworks) to which they belong.

Functionally, network units can be divided into RAN Radio Access Network and CN Core Network. The radio access network includes two functional entities, the radio network controller (RNCRadio Network Controller) and the wireless base station (Node B) of WCDMA, which are used to handle all wireless-related functions, and the CN is controlled by the mobile service switching center (MSC Mobile ServicesSwitching Center) and Serving GPRS Support Node (SGSN Serving GPRS Support Node), which handles the switching and routing of all voice calls and data connections in the UMTS system and external networks. The above two units together with user equipment (User Equipment, UE) constitute the whole UMTS system. Its system structure is shown in Fig. 1.

The interface between the core network and the access network in the 3G network is the interface (Iu) between the RNC and the core network, as shown in FIG. 2 .

The protocol structure of each interface of UTRAN is designed according to a common protocol model. The design principle is that layers and surfaces are logically independent of each other. If desired, one part of the protocol structure can be modified without changing other parts, as shown in Figure 3.

1. "Layers" in the horizontal direction

From the perspective of layers in the horizontal direction, the protocol structure mainly includes two layers: the wireless network layer and the transmission network layer. All the protocols related to the terrestrial radio access network are included in the wireless network layer, and the transport network layer refers to the standard transmission technology selected by UTRAN, which has nothing to do with the specific functions of UTRAN.

2. The "face" in the vertical direction

For the plane in the vertical direction, there are control plane, user plane, transmission network control plane and transmission network user plane included in the former two.

a) Control surface

The control plane includes application protocols (that is, RANAP Radio AccessNetwork Application Part, RNSAP Radio Network Subsystem Application Part, and NBAP Node B Application Part) and transmission of these The signaling bearer of the application protocol.

Application protocols are used to establish bearers for radio access bearers or radio links at the radio network layer. The bearer parameters of the application protocol are not directly related to the user plane technology, but are some common bearer parameters.

The signaling bearer of the application protocol is usually established by O&M Operation and Maintenance.

b) User plane

The user plane includes data flow and data flow bearer. The data flow is the various frame protocols of the relevant interface.

c) Transmission network control plane

The transport network control plane does not contain the information of the wireless network layer, and is completely located in the transport network layer. It includes the Access Link Control Application Protocol (ALCAP Access Link Control Application Protocol) (the ALCAP protocol is used to establish a transmission bearer for the user plane) and the signaling bearer of the ALCAP protocol.

The transport network control plane is between the control plane and the user plane. The introduction of the transmission network control plane makes it possible for the application protocol of the wireless network layer control plane and the transmission and bearing technology of the user plane data to be independent of each other. The signaling bearer of ALCAP is usually also established by O&M.

d) Transmission network user plane

The data bearer in the user plane and the signaling bearer in the application protocol also belong to the transport network user plane. In real-time operation, the transmission bearer of the transmission network user plane data is directly controlled by the transmission network control plane, while the signaling bearer of the application protocol is established by the O&M.

UMTS currently has three versions, R99 version, R4 version and R5 version. Among them, the transmission technology on the wireless access network side of the R99 and R4 versions is based on ATM Asynchronous Transfer Mode. Due to the many advantages of IP technology itself and the impact of the global IP wave, the trend of UMTS network evolution to all-IP has been To be sure, in the R5 version, the access network lists IP transmission as the ground network transmission mode selection parallel to ATM transmission.

As can be seen from the previous introduction, because the UTRAN interface protocol stack has a structure in which the wireless network layer and the transmission network layer are separated, IP transmission can be introduced with the least impact on the wireless network layer.

As shown in Figure 4, it is the process of establishing user data transmission bearer between MSC and RNC when using ATM transmission, which includes:

Step 1: If it is necessary to establish a new user data transmission bearer between MSC and RNC (for example: a user in RNC initiates a voice call), the radio access network application part (RANAP) of MSC will provide The transmission bearer allocates a binding identifier (BID Binding ID), and at the same time allocates the required transmission resources for user data. The MSC sends the binding identifier and the MSC's own ATM transport layer address to the radio access network application part of the RNC through a radio network control plane establishment request message.

Step 2: After the radio access network application part of the RNC receives the above message, it will pass the ATM transport layer address and the binding identifier to the access link control application protocol (ALCAP Access Link) of the transport network control plane of the RNC. Control Application Protocol), and requires the access link control application protocol to initiate the establishment of the transport bearer.

Step 3: RNC's access link control application protocol sends an ALCAP establishment request message to MSC's access link control application protocol, which contains the binding identifier and ATM transport layer address received in the second step . After receiving the ALCAP establishment request message, the MSC can associate the transport bearer establishment request with the user data to be transmitted in the first step through the binding identifier and transport layer address therein.

The process of establishing user data transmission bearer between MSC and RNC when using IP transmission:

ATM is a connection-oriented protocol, and the ALCAP protocol is required to establish an ATM/AAL2 connection between MSC and RNC when establishing a user data transmission bearer. And IP is different from ATM, IP is a connectionless protocol, so it does not need to access the link control application protocol to establish a connection.

If RNC and MSC are pure IP transmission nodes, the process of establishing user data transmission bearer between them:

Step 1: If it is necessary to establish a new user data transmission bearer between MSC and RNC (for example: a user in RNC initiates a voice call), the radio access network application part (RANAP) of MSC will provide The transmission bearer allocates an idle UDP User Datagram Protocol (UDP User Datagram Protocol) port, and the MSC sends the UDP port number and the MSC's own transport layer address, which is the IP address of the MSC, to the RNC through a wireless network control plane establishment request message Radio access network application part.

Step 2: After receiving the above message, the radio access network application part of the RNC also allocates an idle UDP port for the transmission bearer, and the RNC establishes a response message through a wireless network control plane, and sends the UDP port number and the RNC own The transport layer address is the IP address of the RNC sent to the application part of the radio access network of the MSC. So far, the RNC and the MSC respectively know the transmission bearer resource allocated by the opposite end for the user data, that is, "IP address + UDP port number", and the user data transmission bearer is also established.

The IP address and UDP port number in the wireless network control plane message in the above two steps are transmitted through the existing transport layer address information element (IE: Information Element) and the binding identifier IE of the wireless network control plane.

If the transport protocol stacks of MSC and RNC are different, for example, when MSC only has IP protocol stack and RNC only has ATM protocol stack, if a transport bearer needs to be established, the interworking unit IWU is needed. For nodes that only support ATM transmission, the interworking unit can shield all the characteristics of IP transmission nodes, and establish transmission bearers with nodes that only support IP transmission through the interworking unit, just like the same ATM transmission node establishes transmission bearers.

Between the IP transport node and the interworking unit, an IP ALCAP protocol is required to assist the interworking unit and the ATM transport node to establish ATM transmission bearer.

Since MSC and RNC may have ATM/IP dual stack in addition to IP single stack and ATM single stack, there are 9 kinds of intercommunication combinations. In the current UMTS protocol, the processing methods for these 9 cases are shown in Table 1. Shown: Iu-CS interface user plane transmission signaling interworking scheme MSC-RNC The transport bearer address information contained in the wireless network control plane establishment request message sent by the MSC to the RNC Transport bearer address information contained in the wireless network control plane establishment response message sent by the RNC to the MSC Remark 1 ATM - ATM -E.164TLA-Binding Id RNC initiates ATM-ALCAP without IWU 2 ATM-IP -E.164 TLA-Binding Id RNC initiates IP-ALCAP requires IWU 3 IP-ATM -E.164 TLA-Binding Id RNC initiates ATM-ALCAP requires IWU 4 IP-IP -IP address-UDP port -IP address-UDP port ALCAP is not required 5 ATM-ATM&IP -E.164 TLA-Binding Id RNC initiates ATM-ALCAP without IWU 6 IP-ATM&IP -IP address-UDP port -IP address-UDP port- ALCAP is not required 7 IP&ATM-ATM -E.164 TLA-Binding Id Does not require IWURNC to initiate ATM-ALCAP 8 IP&ATM-IP -IP address-UDP port -IP address-UDP port- ALCAP is not required 9 IP&ATM - IP&ATM -IP address-UDP port -IP address-UDP port- ALCAP is not required

Table 1 Iu-CS interface user plane transmission signaling interworking scheme

In the 6th and 9th cases in Table 1, that is, when the MSC supporting IP transmission (only with the IP protocol stack or with the ATM/IP dual stack) initiates and establishes the transmission bearer between the RNC with the ATM/IP dual stack , the MSC will preferentially use IP to initiate the establishment of the transmission bearer with the RNC, that is, the wireless network control plane establishment request message sent to the RNC contains the idle UDP port number allocated for the user data bearer and the MSC's own IP address. When the IP transmission resources of the RNC are exhausted but the ATM transmission resources are still free, since the MSC cannot carry the ATM transmission bearer address information in the wireless network control plane establishment request message at the same time, the RNC cannot use the idle ATM transmission resources to establish a transmission bearer with the MSC. .

Contents of the invention

The purpose of the present invention is exactly in UMTS wireless communication system, when the MSC (only having IP protocol stack or having ATM/IP dual stack) that supports IP transmission initiates and has the transmission bearer between the RNC that has ATM/IP dual stack to set up, if The RNC's IP transmission resources are exhausted but the ATM transmission resources are still free, then the RNC can use the IP transmission bearer information provided by the MSC to derive the MSC's ATM transmission bearer information, and use the idle ATM transmission resources to complete the establishment of the transmission bearer through the IWU and the MSC.

A method for establishing transmission bearer in a general mobile communication system, is characterized in that: utilizing the mapping relation between the IP address of MSC Mobile Services Switching Center (MSC Mobile Services Switching Center) and the ATM address of MSC, when the MSC supporting IP transmission initiates When the transmission bearer between the RNC Radio Network Controller (RNC Radio Network Controller) with ATM/IP dual stack is established, if the IP transmission resources of the RNC are exhausted but the ATM transmission resources are still idle, the RNC uses the idle ATM transmission resources and The MSC completes the establishment of the transport bearer, and the steps are as follows:

The RNC utilizes the IP transmission bearer information provided by the MSC for establishing the transmission bearer, derives the ATM transmission bearer identification information through the mapping relationship, and initiates the establishment request of the ATM transmission bearer;

After the interworking unit IWU receives the ATM transmission bearer establishment request, it determines the MSC according to the ATM transmission bearer identification information, and establishes an IP transmission bearer with the MSC, and sends an establishment request message to the MSC;

The MSC establishes a transport bearer after receiving the establishment request message from the IWU.

The IP transmission bearer information refers to: the IP transport layer address IE and the binding identifier IE sent by the MSC to the RNC in order to establish the transmission bearer, which are used to uniquely identify the transmission resources allocated by the MSC for the establishment of the transmission bearer.

The ATM transport bearer identification information refers to: the ATM transport layer address IE and the binding identification IE sent by the RNC to the IWU in order to complete the establishment of the transport bearer, which are used to uniquely identify the transmission resources allocated by the MSC for the establishment of the transport bearer.

The binding identifier IE conforms to the existing standard, and is only used to transfer the UDP User Datagram Protocol (UDP User Datagram Protocol) port number assigned by the MSC for the establishment of the transmission bearer.

The binding identifier IE may also carry information identifying the IP address of the MSC corresponding to the above-mentioned UDP port number through free bytes therein.

The method for establishing a transmission bearer in the described universal mobile communication system includes the following steps when establishing a user data transmission bearer:

a. The MSC allocates an idle UDP port number in order to establish the IP transmission bearer of user data, and sends the port number and the corresponding IP address to the RNC through the IP transport layer address IE and the binding identifier IE, which are used to uniquely identify the MSC for Transmission bearer establishment allocated transmission resources;

b, the radio access network application part of the RNC judges whether its IP transmission resource is exhausted, if yes, enters step c, otherwise directly utilizes the IP transmission resource to establish a transmission bearer;

C, RNC finds out the ATM address of MSC by looking up the mapping table, RNC sends the ATM transport layer address and the binding identifier to the transport network control plane of itself, uses the access link control application protocol to initiate the establishment request of the ATM transport bearer;

d. After the IWU receives the ATM transport bearer establishment request, it determines the MSC according to the ATM transport layer address, then uses the IP ALCAP protocol to establish an IP transport bearer with the MSC, and sends an IP ALCAP establishment request message to the MSC. The ALCAP establishment request message contains the binding identifier received by the IWU, and the destination address of the message is the IP address found by the IWU according to the ATM address of the MSC;

e. After receiving the IP ALCAP establishment request message from the IWU, the MSC establishes a transmission bearer according to the destination IP address of the message and the information carried in the binding identifier IE.

Owing to adopting the method for setting up the transmission bearer of the present invention, can initiate and have ATM/IP dual-stack RNC at the MSC that supports IP transmission (referring to MSC can support IP transmission at least, comprise the situation that MSC supports IP and ATM transmission simultaneously) When the transmission bearer between the two is established, if the IP transmission resources of the RNC are exhausted but the ATM transmission resources are still idle, the RNC can use the IP transmission bearer information provided by the MSC to derive the ATM transmission bearer information of the MSC, and use the idle ATM transmission resources The establishment of the transmission bearer is completed through the IWU and the MSC, so that the establishment of the transmission bearer can be successfully completed.

Description of drawings

FIG. 1 is a structural diagram of a 3G network in the prior art;

Fig. 2 is a schematic diagram of the interface between the core network and the access network in the 3G network;

Fig. 3 is the schematic diagram of UTRAN interface protocol stack;

Fig. 4 is in the prior art, the schematic diagram of the transmission bearer establishment flow chart when MSC and RNC are for ATM transmission;

Fig. 5 is a schematic diagram of the intercommunication between the IP transmission node and the ATM transmission node through the interworking unit;

Fig. 6 is a schematic flow chart of establishing a transport bearer in the present invention.

Detailed ways

The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

For the shortcoming of prior art, the solution of the present invention is:

The RNC uses the MSC's IP transport bearer information, that is, the MSC's IP transport layer address and binding identifier, and derives the ATM transport bearer identifier information through the mapping relationship between the MSC's IP address and ATM address, that is, the MSC's ATM transport layer address and binding identifier. , and then use the idle ATM transmission resource to complete the establishment of the transmission bearer through the IWU and the MSC.

Here, the ATM transport layer address of the MSC is actually the ATM transport layer address terminated at the IWU, and the IWU can uniquely determine the MSC through the transport layer address.

The IP address and UDP port number of the MSC are transmitted through the existing "Transport Layer Address IE" and "Binding Identifier IE" on the wireless network control plane. By whether to expand the binding identifier IE, the present invention can distinguish two kinds of mapping schemes from the IP address of the MSC to the ATM address:

1. The binding identifier IE fully complies with the existing standard, that is, it is only used to transmit the UDP port number of MSC;

2. Expand the Binding Identifier IE. In addition to carrying the UDP port number, the free bytes in it are used to carry information identifying the IP address of the MSC corresponding to the UDP port number.

The considerations for making these two distinctions are as follows:

Excluding well known ports, the UDP port address space of an IP address is only about 65,000 at most, that is, the number of transmission bearers that can be created under an IP address is only 65,000. However, the number of transmission bearers established by the MSC at the same time will be very large, so when the MSC uses IP transmission, the MSC will have multiple IP addresses.

As shown in Figure 6, after the above settings, the present invention may include the following steps when establishing a user data transmission bearer:

a. MSC assigns a transmission resource—a UDP port number—to establish the IP transmission bearer of user data, and sends the port number and the corresponding IP address to the RNC through the IP transport layer address IE and the binding identifier IE for unique identification The MSC establishes the allocated transmission resources for the transmission bearer;

When it is necessary to establish a new user data transmission bearer between the MSC and the RNC, the radio access network application part (RANAP) of the MSC will allocate necessary transmission resources for the transmission bearer, that is, an idle UDP port. The MSC sends the UDP port number and the corresponding IP address to the radio access network application part of the RNC through a radio network control plane establishment request message.

b, the radio access network application part of the RNC judges whether its IP transmission resource is exhausted, if yes, enters step c, otherwise directly utilizes the IP transmission resource to establish a transmission bearer;

After the radio access network application part of the RNC receives the above message, it first judges the use of its transmission resources, and if its IP transmission resources are still sufficient to establish a transmission bearer, then use the IP resources. In this way, in fact, the existing The transmission bearer establishment method in the technology; if the RNC's IP transmission resources have been exhausted, but its ATM transmission resources are still left, the existing protocol does not provide a solution for how to deal with this situation. The present invention adopts the following steps to establish a transmission bearer through the idle ATM transmission resources of the RNC.

C, RNC finds out the ATM address of MSC by looking up the mapping table, RNC sends the ATM transport layer address and the binding identifier to the transport network control plane of itself, uses the access link control application protocol to initiate the establishment request of the ATM transport bearer;

If the RNC finds that its own IP transmission resources have been exhausted, the RNC checks the mapping table to find out the ATM address of the MSC from the IP address of the MSC. Then the RNC transmits the ATM transport layer address and the binding identifier to its own transport network control plane, and uses the access link control application protocol to initiate the establishment of the ATM transport bearer.

d. After the IWU receives the ATM transmission bearer setup request, it determines the MSC according to the ATM transport layer address, then uses the IP ALCAP protocol to set up the IP transmission bearer with the MSC, and sends an IPALCAP setup request message to the MSC. The IP ALCAP The establishment request message contains the binding identifier received by the IWU, and the destination address of the message is the IP address found by the IWU according to the ATM address of the MSC;

e. After the MSC receives the IP ALCAP establishment request message from the IWU, according to the destination IP address of the message and the information carried in the binding identifier IE, it can associate with the resources allocated for the transmission bearer in step a, thereby establishing the transmission bearer.

By whether to expand the binding identifier IE, two mapping schemes from the IP address of the MSC to the ATM address can be distinguished, namely:

1. The binding identifier IE fully complies with the existing standard, that is, it is only used to transmit the UDP port number of MSC;

2. Expand the Binding Identifier IE, in addition to carrying the UDP port number, use the free bytes in it to carry information for distinguishing different IP addresses of the MSC.

Then, for different mapping schemes, in fact, the MSC and the RNC have slightly different processing methods.

For the first solution, because the binding identifier IE only carries the UDP port number, in order to uniquely determine a user data bearer, after two conversions between the IP address and the ATM address, the IP address must remain unchanged , that is, the IP address detected from the ATM address must be the IP address corresponding to the UDP port number, and cannot be other IP addresses of the MSC. Therefore, it is required that the ATM transport layer address of an MSC can not only uniquely determine an MSC, but must also uniquely determine an IP address of the MSC. For an MSC with multiple IP addresses, there will be at least ATM transport layer addresses corresponding to the number of its IP addresses.

For the second mapping scheme, since the UDP port number is used to carry the binding identifier IE in the wireless network control plane establishment request message sent from the MSC to the RNC, the binding identifier IE has 4 bytes in length, and the UDP port number The number length is only two bytes. Therefore, the two free bytes in the binding identifier IE can be used to carry the information of the IP address corresponding to the UDP port number to distinguish different IP addresses in the MSC. Because the additional IP address information is only interpreted by the MSC filling the information, other network elements do not need to understand its composition rules. Therefore, the format of the additional IP address information can be specified by the MSC manufacturer at the time of implementation, and will not affect the openness of the Iu interface. Here is an example of adding IP address information: assuming that the MSC has 100 IP addresses, the MSC can number the 100 IP addresses, and use the numbers of these IP addresses to represent different IP addresses of the MSC. When the IP transmission resources of the RNC are sufficient, the RNC ignores the additional information in the Binding Identifier IE and only uses the UDP port number therein. This is the flow process in the prior art. If the IP transmission resources of the RNC are exhausted, the RNC initiates the binding identifier of the ATM ALCAP to the IWU and directly adopts the binding identifier IE sent by the MSC. Since the binding identifier IE contains additional IP address information, in step e of the process, the MSC can completely restore the "IP address + UDP port number" only through the binding identifier IE. Therefore, all IP addresses of the MSC only need at least one ATM transport layer address mapping, and it is required that the ATM transport layer address can uniquely correspond to one MSC.

The above two solutions can meet the needs, the difference is:

1. The requirements for the ATM transport layer address space representing MSC are different: the first scheme requires at least one ATM transport layer address corresponding to each IP address of MSC; while the second scheme requires at least one ATM that can uniquely represent MSC The transport layer address is sufficient. Because an MSC may have a large number of IP addresses, the first solution requires each IP address of the MSC to be allocated at least one ATM address, which may have a great impact on the existing ATM address allocation and management mechanism. Introducing the second solution can avoid this problem.

2. Whether it is necessary to extend the binding identification IE used to carry the UDP port number in the wireless network layer establishment request message: the first solution does not need to be extended, and the second solution needs to carry additional information in the binding identification IE To distinguish different IP addresses of MSC.

The present invention can well solve the problem between the MSC supporting IP transmission (referring to MSC that can support IP transmission at least, including the situation that MSC supports IP and ATM transmission at the same time) and the RNC with ATM/IP dual stack by the above scheme. When the transmission bearer is established, the problem that the transmission bearer cannot be established when the IP transmission resources of the RNC are exhausted but the ATM transmission resources are still free. The RNC uses the IP transmission bearer information provided by the MSC to derive the ATM transmission bearer information of the MSC, and uses the idle ATM transmission resources to complete the establishment of the transmission bearer through the IWU and the MSC, thereby successfully completing the establishment of the transmission bearer.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (6)

1, sets up the method for transmission bearer in a kind of universal mobile telecommunications system, it is characterized in that: utilize the mapping relations between the asynchronous transfer mode ATM address of the IP address of mobile services switching centre MSC and MSC, when the MSC that supports the IP transmission initiate with the radio network controller (RNC) with ATM/IP pair of stacks between transmission bearer when setting up, the ATM transfer resource also has idle if the IP transfer resource of RNC is used up, then RNC uses idle ATM transfer resource and MSC to finish the foundation of transmission bearer, and step is:

The IP transmission bearer information that RNC utilizes MSC to provide for setting up transmission bearer derives ATM transmission bearer identification information by described mapping relations, initiates the foundation request of ATM transmission bearer; Interworking unit IWU determines MSC according to described ATM transmission bearer identification information after receiving that this ATM transmission bearer is set up request, and the IP transmission bearer between foundation and this MSC, sends to MSC and sets up request message;

Described MSC receive IWU set up request message after, set up transmission bearer.

2, set up the method for transmission bearer in the universal mobile telecommunications system as claimed in claim 1, it is characterized in that described IP transmission bearer information is meant: MSC mails to IP transport layer address information element IE and the binding logo information unit IE of RNC in order to set up transmission bearer, is used for unique identification MSC and sets up the transfer resource that is distributed for transmission bearer.

3, set up the method for transmission bearer in the universal mobile telecommunications system as claimed in claim 1, it is characterized in that described ATM transmission bearer identification information is meant: RNC mails to ATM transport layer address information element IE and the binding logo information unit IE of IWU in order to finish transmission bearer to set up, be used for the transfer resource that unique identification MSC distributes for transmission bearer sets up.

4, as setting up the method for transmission bearer in claim 2 or the 3 described universal mobile telecommunications system, it is characterized in that described binding logo information unit IE meets existing standard, be used to transmit User Datagram Protoco (UDP) udp port that MSC distributes for transmission bearer sets up number.

5, set up the method for transmission bearer in the universal mobile telecommunications system as claimed in claim 4, it is characterized in that described binding logo information unit IE except carrying udp port number, utilize wherein idle byte to carry the information of distinguishing the MSC different IP addresses.

6,, may further comprise the steps when it is characterized in that setting up the user data transmission carrying as setting up the method for transmission bearer in claim 1 or the 2 or 3 described universal mobile telecommunications system:

A, MSC are the udp port number that the IP transmission bearer of setting up user data distributes a free time, and this port numbers and corresponding IP address mail to RNC by IP transport layer address information element IE and binding logo information unit IE, be used for unique identification MSC and set up the transfer resource that is distributed for transmission bearer;

The wireless access network applying portion of b, RNC judges whether its IP transfer resource is used up, if enter step c, otherwise directly utilize the IP transfer resource to set up transmission bearer;

C, RNC find the atm address of MSC by looking into mapping table, and RNC passes to oneself transmission network chain of command with ATM transport layer address and binding logo, use Access Link Control Application Protocol to initiate the foundation request of ATM transmission bearer;

After d, IWU receive that this ATM transmission bearer is set up request, determine MSC according to this ATM transport layer address, use the IP transmission bearer between the foundation of IP ALCAP agreement and this MSC then, send IP ALCAP to MSC and set up request message, described IP ALCAP sets up and includes the binding logo that IWU receives in the request message, and the destination address of this message is the IP address that IWU finds according to the atm address of MSC;

After e, MSC receive that the IP ALCAP of IWU sets up request message,, set up transmission bearer according to the information of carrying in the purpose IP address of message and the binding logo information unit IE.

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