KR100436139B1 - System and Method for Packet Service in the IMT-2000 SGSN - Google Patents

Abstract

The present invention provides a packet service system in an IMT-2000 SGSN configured to perform network resource management and packet call admission control according to QoS (Quality of Service) information required for packet service in an IMT-2000 Serving GPRS Support Node (SGSN). And to a method.

The present invention calculates ATM traffic resources according to the QoS information and determines whether there are available resources in order to support the QoS-specific service required by the IMT-2000 service subscriber in the asynchronous IMT-2000 SGSN. By controlling resource allocation and acceptance of packet service, it allocates and manages available resources at a certain rate by traffic class and concentrates on a specific service so that only a few subscribers can use all resources and can no longer provide services. This can be improved, and by controlling the subscriber to require an appropriate bandwidth when a large bandwidth is required, efficient resource management can be performed to provide services to a large number of subscribers with limited resources. have.

Description

System and Method for Packet Service in the IMT-2000 SGSN

The present invention relates to a packet service system and method in the IMT-2000 SGSN, and more particularly, to perform network resource management and packet call admission control functions according to quality of service (QoS) information required for packet service in the IMT-2000 SGSN. One IMT-2000 SGSN relates to a packet service system and method.

In general, when a packet call is connected to an asynchronous IMT-2000 mobile subscriber, a bandwidth is allocated in an ATM-based packet switch according to a preset QoS value, and then using a GPRS Tunneling Protocol (GTP). It exchanges signaling and traffic information with GGSN and passes it to public IP (Internet Protocol) network for packet service. Here, the GTP is a protocol recommended by the IETF to transfer signals and traffic transmitted and received between the SGSN and the GGSN matched with Fast Ethernet.The packet data call is started by the mobile subscriber performing a packet service attempt and passed through the RNC to the SGSN. In SGSN, it converts to GTP format and delivers. Through the traffic tunneling configured as above, packet service can be received.

The next generation GPRS network includes an MS 11, an RNC 12, an HLR 13, an SGSN 14, a GGSN 15, and an Internet network 16, as shown in FIG. The RNC 12 is a wireless network control system, the HLR 13 is a database for managing the location and all information of the IMT-2000 subscriber, and the SGSN 14 is a GPRS service support system for the Iu interface. It interworks with the corresponding RNC 12 and supports the GPRS service of the MS 11 by interworking with the corresponding GGSN 15 through the GN interface, and the GGSN 15 interworks with an external packet switching network and connects the GN interface. It supports the transmission of packet data service between the MS 11 and the external packet network by interworking with the corresponding SGSN 14 through the IP backbone network. In addition, the Iu interface refers to the interface between the RNC 12 and the Core Network, and the GN interface refers to the interface between the SGSN 14 and the GGSN 15 in the same provider network.

As described above, in the next generation GPRS network, two network nodes exist for the packet service, SGSN 14 and GGSN 15, and the SGSN 14 and GGSN 15 have an MS 11 or PDN (Packet Data). It generates PDP (Packet Data Protocol) context to transmit the incoming traffic from the network, and TEID (Tunneling Endpoint) between RNC 12 and SGSN 14 and between SGSN 14 and GGSN 15 Identifier) to identify the PDP context and send traffic.

Tunneling (Tunneling) for transmitting the traffic is allocated to each node, the bandwidth is determined for each tunneling is different and the bandwidth is determined according to the QoS information required at the time of packet origination.

The mobile subscriber call processing protocol software in the packet exchange will then allocate the appropriate bandwidth according to the required QoS attributes.

Therefore, the resource allocation processing method according to the required QoS value of the packet data call is to be in accordance with the intention of the system developer. Accordingly, a method of maximizing the efficiency of resource usage is required. The need for the ability to control acceptance is required, but so far no technology has been implemented.

An apparatus for allocating ATM resources for signaling and traffic interworking with the RNC 12 in the SGSN 14 of an asynchronous IMT-2000 packet data call includes a main processor for matching the RNC 12 in a hardware configuration. The main processor manages an ATM control board in charge of an ATM function in the SGSN 14, and the ATM control board performs STM-1 matching with the RNC 12.

In addition, one ATM control board has four ports of STM-1 level, one STM-1 port supports a bandwidth of 150 (Mbps), and has one port per one RNC (12) signal. And distributes the required traffic for each QoS.

As described above, the conventional technique allocates resources to service requests for each data call, but the method for efficient resource management in the IMT-2000 SGSN system is not applied. In addition, bandwidth is used differently according to the type of packet service. If only the bandwidth-intensive specific service is allocated, another specific service capable of serving a large number of subscribers may be restricted. Resource management according to traffic class is required, but the technology has not been implemented so far.

In order to solve the above problems, the present invention is to perform the network resource management and packet call admission control function according to the QoS information required for packet service in the IMT-2000 SGSN, the purpose is to.

In addition, the present invention is to calculate the ATM traffic resources according to the QoS information in order to support the service for each QoS requested by the IMT-2000 service subscriber in the packet service attempt in the asynchronous IMT-2000 SGSN to determine whether there is available resources The purpose of the present invention is to efficiently manage resources by controlling resource allocation and acceptance of requested packet services.

In addition, the present invention allocates and manages the available resources at a certain ratio for each traffic class in the asynchronous IMT-2000 SGSN, which concentrates on a specific service so that only a few subscribers can use all the resources and can no longer provide the service. Its purpose is to help improve what can happen.

In addition, the present invention, by controlling the subscriber to request the appropriate bandwidth when a large bandwidth is asynchronously in the asynchronous IMT-2000 SGSN, efficient resource management to provide services to a large number of subscribers with limited resources, the object There is this.

1 is a diagram showing the configuration of a next-generation General Packet Radio Service (GPRS) network related to the present invention.

2 is a block diagram schematically illustrating a configuration for packet service in an IMT-2000 SGSN according to an embodiment of the present invention.

3 is a flowchart illustrating a packet service method in an IMT-2000 SGSN according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating a resource allocation process in FIG. 3.

Explanation of symbols on the main parts of the drawings

11: MS (Mobile Station) 12: RNC (Radio Network Controller)

13: HLR (Home Location Register)

14: Serving GPRS Support Node (SGSN)

15: Gateway GPRS Service Node (GGSN)

16: Internet Network

20: Packet Session Management Module

30: ATM resource management module

In the IMT-2000 SGSN according to an embodiment of the present invention for achieving the above object, a packet service system performs a packet call processing function, translates QoS (Quality of Service) information of a requested packet call, and calculates a bandwidth. A packet session management module for requesting resource allocation; And an ATM resource management module configured to receive a resource allocation request from the packet session management module and manage an ATM (Asynchronous Transfer Mode) resource according to the traffic class and bandwidth of the QoS information.

Here, the ATM resource management module manages bandwidth information of an ATM control board matched with a Radio Network Controller (RNC), allocates all available resources by traffic class in advance, and then allocates the bandwidth required for each traffic class. It is characterized by allocating or limiting resources by determining whether to accept according to the situation of available resources.

In addition, the ATM resource management module allocates the resources that can be provided by a system in advance by a certain ratio for each traffic class, and then calculates the resources allocated for each packet call and determines whether to allow or limit the resources. It is characterized in that to provide a packet service requiring less bandwidth by requiring less bandwidth at the time.

Meanwhile, in the IMT-2000 SGSN according to an embodiment of the present invention, a packet service system requests a packet service from a mobile station (MSN) to a serving GPRS support node (SGSN) in order to achieve the above object. After receiving the accept process, transmitting a packet data protocol (PDP) context activation request message to a corresponding SGSN to request creation of a PDP context; Calculating available resources in the SGSN and allocating resources for the PDP context according to bandwidth based on QoS information in the PDP context creation message; Allocates radio resources between a Gateway GPRS Service Node (GGCN) and an RNC, and between an RNC and the MS, and performs a request and response to create a PDP context from the SGSN to the corresponding GGCN, thereby transmitting packets between the RNC and the SGSN and between the SGSN and the GGSN. Tunneling for traffic transmission and reception and generating a PDP context, characterized in that made.

In this case, the PDP context activation request message includes parameters for packet call setup, and the corresponding parameters include QoS information.

Preferably, the resource allocation process includes receiving a PDP context activation request message from a packet session management module, interpreting QoS information, and determining a traffic class and bandwidth based on the QoS information; Requesting a resource allocation module from an ATM resource management module based on the traffic class and bandwidth in the packet session management module; Calculating, by the ATM resource management module, resources currently available and required resources to determine the state of the currently available resources according to the traffic class to determine whether to accept them; Generating, by the ATM resource management module, a response message for determining whether to accept the resource, and notifying the packet session management module; Receiving the response message from the packet session management module and confirming whether to accept the resource; And performing a packet call setup operation when the packet session management module accepts the requested resource.

Also preferably, the resource allocation process may further include determining a smaller bandwidth when the packet session management module rejects the requested resource and re-requesting resource allocation from the ATM resource management module. It features.

Further preferably, the resource allocation process further comprises the step of limiting the call while transmitting a rejection message for the PDP context creation request when the resource allocation request is rejected.

Alternatively, the resource allocation process designates a bandwidth usage ratio for all available resources for each traffic class, and manages, calculates, and adjusts the bandwidth for each traffic class according to the specified ratio.

Here, the traffic class is divided into a streaming class, a call class, an interactive class, and a background class, and the bandwidth is also differently allocated according to each class. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, a configuration for packet service in the IMT-2000 SGSN according to an embodiment of the present invention is largely divided into two modules, that is, a packet session management module 20 that handles packet call processing, and ATM resource management. ATM resource management module (30) which is in charge of the ATM-based IMT-2000 packet exchanger that supports different bandwidths according to service attributes. It is made to manage.

The packet session management module 20 is responsible for a packet call processing function, and requests resource allocation to the ATM resource management module 30 by translating the QoS information of the requested packet call and calculating a bandwidth.

The ATM resource management module 30 manages bandwidth information of an ATM control board matched with the RNC, receives a resource allocation request from the packet session management module 20, and allocates resources according to the requested traffic class and bandwidth. After allocating the total available resources by traffic class in advance, the bandwidth required for each traffic class is determined according to the situation of the resources currently available to allocate or limit the resource.

In addition, the ATM resource management module 30 is to allocate the resources available in advance according to the traffic class, the resources that can be provided in one system in advance by assigning a predetermined ratio for each traffic class, and then is assigned to every packet call Calculate resources to determine whether to allow or limit them, to require less bandwidth in case of resource shortages, to allocate only available resources for each traffic class, and to provide many services by specific traffic classes. It helps to improve the problems provided.

If traffic class services that require a lot of bandwidth are concentrated and all allocated as required, they will be limited to other traffic class services that require less bandwidth. By providing a service, a large number of subscribers can be sufficiently serviced, and an unnecessary bandwidth can be allocated to prevent resource waste.

The QoS information is described in Table 1 below.

QoS Quality of service Explanation RELIAB_CLSS Confidence rating Represents the nature of the transmission of data and indicates the rating of data transmission trust. DLY_CLSS Delay Display the grade for data delay (delay class 1 to delay class 4) PRECED_CLSS Ranking Indicates the rank that maintains the service (high, normal, low priority) PEAK_THRPU Throughput Indicates the maximum amount of throughput for user data MEAN_THRPUT Average throughput Indicates the maximum amount of throughput for user data DLVR_ERR_SDU Whether to send error SDU Indicates whether to send or discard SDUs detected as an error (Yes: send, No: discard) DLVR_ORDER Command Indicates whether or not to forward UMTS bearers to SDUs in order (Yes: transfer command, No: transfer command) TRAFFIC_CLS Traffic class Calls, Streaming, Interactive, Background Separated Calls: VoIP, Video Conferencing, Video Calls, etc. Streaming: Live Streaming Video, Audio, etc. Interactive: Web Browsing, Interactive Email, Server Access, etc. Background: Background Email, SMS, Downloading, etc. MAX_SDU_SIZE Maximum SDU Size Refers to the maximum allowed SDU size MAX_BIT_UP Max Bit Uplink Maximum number of uplink bits to transmit in time (unit kbps) MAX_BIT_DN Bit downlink Maximum number of downlink bits transmitted in time, in kbps RESIDUAL_BER Surplus Bit Error Rate Bit error rate not detected among bit errors of transmitted SDUs SDU_ERR_RTO SDU error rate SDU error rate detected as an error TRAF_H_PRIOR Traffic handling priority Refers to a class for handling the relative importance of all SDUs belonging to a UMTS bearer compared to the SDUs of other bearers. TRANS_DELAY Transmission delay Refers to delay for sending SDU G_MAX_BIT_UP Guaranteed Bit Rate for Uplink Number of uplinks transmitted and guaranteed by UMTS of one session in time, in kbps G_MAX_BIT_DN Guaranteed Bit Rate for Downlink Number of downlinks transmitted and guaranteed by UMTS of one session in time, in kbps

The packet service method in the IMT-2000 SGSN according to an embodiment of the present invention will be described with reference to the flowchart of FIG. 3.

Hereinafter, an operation of establishing a packet call in a next generation GPRS is called an operation of creating a PDP context. The creation of a corresponding PDP context means that a path for a subscriber to transmit and receive a packet data service is established. It means that you can receive.

In the IMT-2000 SGSN according to an embodiment of the present invention, the packet service method can be largely divided into a PDP context creation request process, a resource allocation process, and a PDP context creation process. There is tunneling for.

First, the PDP context creation request process is as follows.

Each node of the MS, RNC, SGSN, GGSN, and HLR generates and stores a PDP context, which is information about packet services, and the MS first performs a service request message (IMT-2000 subscriber packet service) to perform packet service. Service Request Message) is transmitted to SGSN via RNC.

Accordingly, the SGSN receives a service request message from the MS via the RNC and transmits a corresponding service accept message to the MS.

Accordingly, after receiving the service accept message from the SGSN via the RNC, the MS transmits a PDP context activation request message to the SGSN. In this case, the PDP context activation request message includes a parameter for establishing a packet call. Parameters) and QoS information among the parameters.

Secondly, the resource allocation process is as follows.

The SGSN receives a PDP context activation request message from the MS via the RNC and allocates network resources for the requested PDP context. The SGSN allocates resources according to bandwidth based on the requested QoS information. In this case, the SGSN calculates the available resources to efficiently manage.

That is, the SGSN calculates available resources and allocates resources for the requested PDP context according to bandwidth based on the requested QoS information.

Third, the process of generating the PDP context is as follows.

The SGSN performs a call setup procedure on the requested PS (Packet Service) call to request creation of a PDP context with a GGSN serving as a radio resource allocation procedure and a gateway to an external packet network and has a response procedure. . Here, the PS call refers to a call made by the mobile subscriber to receive a wireless packet (data) service instead of a voice service.

Accordingly, after tunneling for packet traffic transmission and reception between the RNC and the SGSN and between the SGSN and the GGSN and generating the PDP context between each node, the SGSN performs a PDP context generation response to the MS.

Meanwhile, the resource allocation process will be described in detail with reference to the flowchart of FIG. 4.

In the next generation GPRS service, a session is called to enable a set of services such as a PDP context and traffic path resource allocation generated for one packet service.

The SGSN manages two modules for resource management and allocation, and divides and processes the packet session management module 20 for packet call processing and the ATM resource management module 30 for ATM resource management.

First, the packet session management module 20 is a module that manages a resource allocation request and a series of other packet call processing operations, and receives a PDP context activation request message from the MS via the RNC (step S1). QoS information is analyzed among the parameters in the received PDP context activation request message (step S2) to determine the traffic class and bandwidth based on the analyzed QoS information (step S3).

Then, the packet session management module 20 performs a resource allocation request to the ATM resource management module 30 based on the determined information (ie, traffic class and bandwidth) (step S4).

Accordingly, the ATM resource management module 30 receives a resource allocation request from the packet session management module 20 (step S5), calculates currently available resources and required resources, and calculates resources currently available according to the traffic class. After determining the state of (step S6), it is determined whether to accept or reject the resource allocation request (step S7), and generates a response message for determining whether to accept the resource, the packet session management module ( 20) (step S8).

Here, for efficient resource management, the operator can specify the bandwidth usage ratio for each available traffic class for all available resources, and manage, calculate, and adjust the bandwidth for each traffic class according to the specified ratio. . In this case, the traffic class is divided into four classes of streaming, call, two-way, and background, and bandwidths are allocated differently according to each class.

For example, 30 (%) for streaming service, 20 (%) for conversation service, 30 (%) for interactive service, and background service (background). Service) allows the operator to designate according to the current service status in the network at a rate of about 10%.

Accordingly, the packet session management module 20 receives the response message from the ATM resource management module 30 (step S9) and checks whether the ATM resource management module 30 has accepted the resource allocation request. (Step S10), if it accepts the request for resource allocation, the packet call setup process is continued (step S11). In case of rejecting the request for resource allocation, the smaller bandwidth is determined to determine the resource allocation request again. Attempt is made to the ATM resource management module 30 (step S12). At this time, the number of times is limited to two times.

After that, when rejecting the resource allocation request again, the call is restricted while transmitting a reject message for the requested PDP context activation request.

As described above, in order to support the service for each QoS requested by the IMT-2000 service subscriber in the asynchronous IMT-2000 SGSN according to the present invention, the ATM traffic resource is calculated according to the QoS information and whether there are available resources. By determining and controlling resource allocation and acceptance of the requested packet service, allocating and managing available resources at a certain rate by traffic class, and concentrating on a specific service, using all resources with only a few subscribers. It can improve the problem that can not be provided.

In addition, according to the present invention, by controlling the subscriber to request an appropriate bandwidth when a large bandwidth is inadvertently requested, efficient resource management can be performed to provide a service to many subscribers with limited resources.

Claims (10)

A packet session management module which performs a packet call processing function and requires resource allocation by translating quality of service (QoS) information of a requested packet call and calculating a bandwidth; Receiving a resource allocation request from the packet session management module to the ATM resource management module for managing the ATM (Asynchronous Transfer Mode) resources according to the traffic class and bandwidth of the QoS information Packet service system. The method of claim 1, The ATM resource management module manages bandwidth information of an ATM control board matched with a Radio Network Controller (RNC), allocates all available resources by traffic class in advance, and then uses the currently available bandwidth for each traffic class. The packet service system of IMT-2000 SNS, characterized in that to allocate or limit the resource by determining whether to accept according to the situation of the resource. The method of claim 1, The ATM resource management module allocates the resources that can be provided by a system in advance by traffic class at a predetermined rate, and then determines whether to allow or limit the resources allocated to each packet call. Packet service system in IMT-2000 SNS, characterized in that to require less bandwidth to provide a packet service that requires less bandwidth. After requesting packet service from MS (Mobile Station) to Serving GPRS Support Node (SGSN) and receiving corresponding service acceptance, send PDP (Packet Data Protocol) context activation request message to corresponding SGSN to create PDP context Process of doing; Calculating available resources in the SGSN and allocating resources for the PDP context according to bandwidth based on QoS information in the PDP context creation message; Allocates radio resources between a Gateway GPRS Service Node (GGCN) and an RNC, and between an RNC and the MS, and performs a request and response to create a PDP context from the SGSN to the corresponding GGCN, thereby transmitting packets between the RNC and the SGSN and between the SGSN and the GGSN. The packet service method in IMT-2000 SNS, characterized in that the tunneling for the transmission and reception of traffic and generating a PDP context. The method of claim 4, wherein The PDP context activation request message includes parameters for packet call setup, and the parameters include QoS information. The method of claim 4, wherein The resource allocation process may include receiving, by the packet session management module, the PDP context activation request message, interpreting QoS information, and determining traffic class and bandwidth based on the QoS information; Requesting a resource allocation module from an ATM resource management module based on the traffic class and bandwidth in the packet session management module; Calculating, by the ATM resource management module, resources currently available and required resources to determine the state of the currently available resources according to the traffic class to determine whether to accept them; Generating, by the ATM resource management module, a response message for determining whether to accept the resource, and notifying the packet session management module; Receiving the response message from the packet session management module and confirming whether to accept the resource; And performing a packet call setup operation when the packet session management module accepts the requested resource. The method of claim 6, The resource allocation process may further include determining a smaller bandwidth when the packet session management module rejects the requested resource, and requesting resource allocation from the ATM resource management module. -2000 Packet service method in SNS. The method of claim 7, wherein The resource allocation process further comprises the step of limiting the call while transmitting a rejection message for the PDP context creation request when the resource allocation request is rejected. Service method. The method of claim 4, wherein The resource allocation process designates the bandwidth usage ratio of all available resources for each traffic class, and manages, calculates, and adjusts bandwidth for each required traffic class according to the specified ratio. Packet service method in ss. The method of claim 9, The traffic class is divided into a streaming class, a call class, an interactive class, and a background class, and a bandwidth is also allocated differently according to each class.