KR20020059998A - Architecture of RAN in ALL-IP network and method of interfacing in RAN - Google Patents

Abstract

PURPOSE: A structure of a radio access network in an all-Internet protocol network and an interfacing method thereof are provided to easily construct the radio access network having an open type structure and effectively construct the structure flexible in extension of systems and IP-based network construction. CONSTITUTION: A radio access network of an All-IP network uses an Internet protocol as a basic protocol and has a dispersed structure that each entity and subsystem within the network is independently configured. To transmit data between entities and subsystems in this dispersed structure, new interfaces are defined such as a signaling interface between AGWs(Access Gateways)(AG1), an interface for transmitting traffic between AGWs(AG2), a signaling interface for authentication and initial registration between RNCS(Radio Network Control Function)-MMs(Mobility Management)(Re1), a signaling interface between RNCSs(Re2), an interface for transmitting user data between RNCSs(Re3), a signaling interface between the RNCS and an RBF(Radio Bearer Control Function) within the RAN(Ri1), a signaling interface between the RNCS and a BTS within the RAN(Ri2), an interface for transmitting user data between the RNCS and the BTS within the RAN(Ri3), and an interface for transmitting user data between BTSs(Rb1).

Description

Structure of Wireless Access Network in Integrated Internet Protocol Network and Its Interfacing Method {Architecture of RAN in ALL-IP network and method of interfacing in RAN}

The invention ^{3GPP (3 rd Generation Partnership Projects)} UMTS (Universal Mobile Telecommunication Service), 3GPP2 IMT-2000 (International Mobile Telecommunication) next-generation mobile communication network based integrated Internet Protocol (ALL-IP) radio access network in the network, such as (RAN: Radio Access Network) and its interfacing method.

Currently, the two main mechanisms of 3GPP (3 ^rd Generation Partnership Projects) and 3GPP2 of the International Conference on the Standardization of IMT-2000 system, the entire network, the Internet Protocol (IP: Internet Protocol) converged IP, based networks (All-IP) networks is issued It is expected to include a specification for implementing an All-IP network in the future.

All-IP network is a network using IP for all transmissions from terminal to core network and is expected to be evolved from existing network for compatibility with current mobile communication network.

3GPP defines the All-IP core network as "Release 2000 core that uses IP for the transport of all user data and signaling", and 3GPP2 "produces IP for user data and signaling between all network entities, including the terminal." IP-based network using "."

The all-IP network has an open structure in the form of a data network, which enables effective introduction of various services to be deployed in the future, especially IP-based services, and enables integrated and low-cost maintenance using IP. In addition, by using IP, it is possible to provide a flexible service regardless of access means (PSTN, LAN, HIPERLAN, Cable, Wireless, etc.), and has an advantage of efficiently constructing a multimedia service.

Therefore, a method for facilitating an open network configuration in an RAN system configuration of an All-IP network and effectively configuring a flexible structure for the scalability and IP-based network configuration of each system is required.

The present invention has been proposed to meet the above requirements, and facilitates the configuration of an open structure to the RAN system configuration of the All-IP network and provides a flexible structure to the scalability and IP-based network configuration of each system An object of the present invention is to provide a structure of a radio access network (RAN) and an interfacing method thereof for effectively configuring the same.

1 is an exemplary configuration diagram of a 3GPP2 integrated internet protocol (ALL-IP) network to which the present invention is applied.

2 is a diagram illustrating an embodiment of a wireless access network according to the present invention.

Figure 3 is a detailed configuration diagram of one embodiment of the RNCS of Figure 2 according to the present invention.

Figure 4 is a detailed configuration diagram of one embodiment of the RBF of Figure 2 according to the present invention.

Figure 5 is a detailed configuration diagram of one embodiment of the MM of Figure 2 in accordance with the present invention.

Figure 6 is a detailed configuration diagram of one embodiment of the BTS of Figure 2 according to the present invention.

* Explanation of symbols for the main parts of the drawings

11 mobile station (MS) 12 base station (BTS)

13 base station controller (BSC) / wireless access network (RAN) + packet control function (PCF)

14: mobility manager (MM) 15: external agent (FA)

16: media resource function 17: mobile IP home agent

18: media gateway device 19: border router

20: old MS domain support 21: location server

22: PDE 23: Individual Quality of Service Manager

24: AAA Security Manager 25: Advertising Agent

26: network performance gateway device 27: session control manager

28: Total Service Quality Manager 29: Service Application Department

30: roaming signal gateway device 31: relay line signal gateway device

32: media gateway device control function

The present invention for achieving the above object, in the structure of a wireless access network (RAN) of the next generation mobile communication network-based integrated Internet protocol (ALL-IP) network, using the Internet protocol as a basic protocol, each entity and sub in the network The systems are configured independently to have a distributed structure, and in this distributed structure, a new interface is defined for information transfer between each entity and subsystem.

As the current mobile communication network evolves into an all-IP network, which is an IMT-2000 network, in order to effectively control and manage new services and user data, the core network includes an ANSI-41 domain and a new service and In order to provide Internet-based services, IP multimedia (IP Multi Media) domains are classified.

Therefore, in order to efficiently control the control traffic and data transmission of the existing service and the new packet-related service in the All-IP wireless network, the wireless network entity based on the Internet protocol can be configured like the components of the core network. In order to configure such an open and distributed structure in the wireless network, a common interface between each subsystem and entity in the wireless network should be defined as shown in FIG. 2.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a 3GPP2 integrated internet protocol (ALL-IP) network to which the present invention is applied.

The mobile station (MS) 11 is within the range of any base transceiver system (BTS) 12, and the information of the mobile station 11 is controlled by the base station 12 and the base station controller (BSC: Base) that controls it. Information transmitted from the base station controller 13 is transmitted to the mobile station 11 via the base station 12.

The mobile station 11 is a wireless terminal including an ALL-IP terminal, a conventional mobile terminal (non-IP terminal), a personal digital assistant (PDA), and the like, which the user can carry and communicate with while moving, and forwards the data when receiving the data. The channel is used, and the reverse channel is used for transmission.

The text message transmitted and received at the mobile station 11 is connected to the base station controller 13 through the base station 12 for high frequency signal processing and call processing.

The base station (BTS) 12 connects the mobile station 11 to the base station controller 13, and includes an antenna, a digital channel unit (DCU), and a timing / frequency control unit (TCU). Unit), a radio frequency unit (RFU), and a global positioning system (GPS). In addition, the base station 12 performs a wired / wireless conversion function of communicating with the mobile station 11 over the air and communicating with the base station controller 13 by wire.

A wireless access gateway (WAG) includes a conventional base station controller (BSC), a packet control function (PCF) and a packet data serving node (PDSN) (foreign agent (FA) (15). This function can be linked to or separated from a system, and performs a wireless controller, voice and data gateway functions, etc. The functions of each component will be described in detail as follows.

A base station controller (BSC) 13 controls and manages one or more base stations (BTSs) 12 and performs traffic and signaling, mobility management, mobile station (MS) 11 management, and the like, associated with call processing.

The radio access network (RAN) is composed of a base station controller (BSC) 13 and a base station (BTS) 12.

The packet control function unit (PCF) 13 may exist inside the base station controller (BSC) 13 or may be implemented as a separate system outside, and may be transmitted from a mobile station (MS) transmitted from a radio access network (RAN). Data of the 10) to a packet data service node (PDSN) (external agent (FA) 15).

A packet data service node (PDSN) performs the function of an external agent (FA) 15, forwards incoming and outgoing packets for packet data of a mobile station (MS) 11 to an appropriate path, and performs a mobile station (MS) 11 It plays an end role to set and manage the connection layer protocol.

A mobility manager (MM) 14 performs handoff management between wireless access gateway devices or between networks.

The media resource function (MRF) 16 performs a management function of allocating / releasing resources of the media gateway devices 18.

The media gateway (MGW) 18 performs functions such as protocol and address translation when the user's data is transferred to a public switched telephone network (PSTN) or another network.

The media gateway control function (MGCF) 32 controls and manages the media gateway devices 18.

The Mobile IP Home Agent 17 manages the IP address of the external agent as a table of the location information of the mobile IP as a table, and transmits the transmission data to the subscriber through tunnel and encryption as necessary. Perform.

The border router (BR) 19 provides a function of connecting a hierarchical communication network (for example, an IP network) operating at a protocol level such as a core network.

The existing MS domain support unit 20 supports functions such as call processing, mobility management, service management, resource management, security management, and service management, which were provided in the existing line-type wireless network for the non-IP mobile terminal. To this end, it includes an existing network entity (that is, a home location register (HLR), a mobile switching center (MSC) server, a service control switch (SCP), etc.).

The position server 21 has positional information, a function such as a moving position center, and a linkage function with a position measurement device (PDE) 22.

Quality of Service Managers 23 and 28 manage network authentication and all voice and data service logic.

Authorization, Authentication, and Accounting (AAA) The security manager 24 provides Internet protocol functions that support authentication, authorization, and billing functions.

The advertising agent (ADA) 25 performs a function of providing an advertisement message for the service application capability to the requesting terminal.

The service application 29 provides an operator with an environment in which new services and application services can be created.

A network capability gateway device (NCGW) 26 manages resources required to provide a service to a network user and provides a function for accessing network resources necessary for executing a service application.

The Session Control Manager (SCM) 27 sets up and manages sessions, states, and handoffs through various networks.

The roaming signaling gateway (R-SGW) 30 performs a function of converting packet signals into a signaling scheme of a circuit switched network or a signaling scheme of a circuit switched network into packet signals.

Trunk Signaling Gateway (T-SGW) 31 performs the function of converting the signaling method of the public switched telephone network (PSTN) and the signaling method of the core network.

A home subscriber server (HSS) includes at least network elements such as AAA, HLR, EIR, LOC, and UMS.

The Equipment Identity Register (EIR) is a database (DB) for device information.

The location related information DB (LOC) provides the location related information required by the location server 21.

The Policy Repository manages policy data and rules, allows interaction with various policies, and stores data on subscribers, multimedia usage policies, quality of service, validity times and paths.

The home location register (HLR) has information such as subscriber information, IP priority, resources and authority usage for interdomain services.

The All-IP standard model currently in progress in 3GPP2 is based on the IP Multi-Media (IPMM) domain for packets on the core network and the ANSI-41 domain for existing circuit services. Domain is defined.

The basic protocol of IPMM is based on Mobile IP, Session Initiation Protocol (SIP), and the protocol of ANSI-41 domain (IS-2000, IOS, ANSI-41, etc.) The protocol of is used. In addition, the structure of a wireless network is similar to that of an existing network such as a base station (BTS), a base station controller (BSC) and a packet control function unit (PCF) for accessing a packet network.

However, the current structure of the wireless network is in the stage of introducing a concept different from the current structure, such as the use of IP technology for the development and efficient network configuration of the All-IP network in the future.

Accordingly, the present invention proposes an interface within a radio network and a structure of each subsystem for constructing an efficient all-IP radio network.

The wireless network of the future All-IP network uses the Internet protocol as a basic protocol, and each entity and subsystem in the network has a distributed structure. In this distributed structure, a new interface must be defined for information transfer between each entity and subsystem.

The presented interfaces are as follows.

-AG1: Signaling interface between AGW (Access Gateway)

-AG2: Interface for transmitting user traffic between AGWs

Re1: signaling interface for initial registration and authentication between RNCS-MMs

Re2: signaling interface between RNCS

-Re3: Interface for transmitting user data between RNCS

Ri1: signaling interface between RNCS and RBF in RAN

Ri2: signaling interface between RNCS and BTS in RAN

Ri3: Interface for user data transmission between RNCS and BTS in RAN

Rb1: Interface for transmitting user data between BTSs

2a, 2b, 2c: Interfaces already defined in the All-IP document, signaling interface for authentication and initial registration date, data transmission interface and signaling interface between AGW and RBF

In addition, each subsystem performs the following roles (see FIGS. 3 to 6).

As shown in FIG. 3, RNCS (Radio Network Control Function) is a block that performs functions similar to those of the existing network, such as call processing, radio resource management and allocation, and handoff processing of an existing network. Responsible for processing the interface, radio resource management, and mobility management. Each of these functions includes an interface processing unit for interface processing, a wireless channel management unit for managing and assigning / releasing radio channels between a terminal and a wireless network, a wired and wireless link management unit for managing wired and wireless links after a connection is established, and for managing mobility and handoff of users. It is composed of a mobility processing unit.

As shown in FIG. 4, an RBF (Radio Bearer Control Function) is an entity that provides a bearer for transmitting user data after establishing a user connection. The RBF includes a wired link manager that manages a connection and an interface processor that processes an interface.

As shown in FIG. 5, MM (Mobility Management) performs a function of transmitting a user request to an AAA (Authentication / Authorization / Accounting) server of a network for handoff processing and initial user registration and authentication between AGWs and wireless networks. . The MM entity is composed of a mobility processor for signaling transmission between other wireless networks for handoff processing, a signaling processor for user registration / authentication, and an interface processor for interface processing.

As shown in FIG. 6, the BTS performs the same function as the BTS of the existing network for radio interval transmission. The BTS includes a radio link manager and an interface processor under the control of the RNCS.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

As described above, the present invention relates to a specific system configuration for the RAN field in all-IP based IMT-2000 system configuration, which is a major standardization issue in current standardization organizations (3GPP, 3GPP2, ITU, etc.). It is easy to configure the open network in the RAN system configuration of the RAN system, and the flexible structure in the scalability and IP-based network configuration of each system can be effectively configured.

Claims (2)

In the structure of a wireless access network (RAN) of the next generation mobile communication network-based integrated Internet protocol (ALL-IP) network, The Internet protocol is used as a basic protocol, and each entity and subsystems in the network are independently configured to have a distributed structure. In this distributed structure, a new interface is defined for information transfer between each entity and subsystem. The structure of a wireless access network in an integrated Internet protocol network and its interfacing method. The method of claim 1, The interface is, Signaling interface (AG1) between AGWs, interface for transmitting user traffic between AGWs (AG2), signaling interface (Re1) for authentication and initial registration between RNCS-MMs, signaling interface (Re2) between RNCS, and interface for user data transmission between RNCS (Re3), signaling interface between RNCS and RBF in RAN (Ri1), signaling interface between RNCS and BTS in RAN (Ri2), user data transmission interface (Ri3) between RNCS and BTS in RAN, and user data transmission between BTSs The structure of a radio access network and an interfacing method thereof in an integrated internet protocol network, characterized in that the interface (Rb1).