KR20090074408A - System and method for setting quality of service dynaimcally in broadband wireless communication system - Google Patents

Abstract

A system and a method for dynamically setting QoS(Quality of Service) in a broadband wireless communication system are provided to efficiently set MAC(Media Access Control) layer QoS by considering resource and latency. A first server manages user class information of a terminal. A second server obtains application layer QoS information from a service request message received from the terminal. A control station(130) forms a QoS parameter set for a lower layer of the application layer by using the application layer QoS information and the user class information. A wireless connection node performs a procedure for generating a MAC layer service flow by using the QoS parameter set comprised by the control station.

Description

System and method for setting dynamic quality of service in broadband wireless communication system {SYSTEM AND METHOD FOR SETTING QUALITY OF SERVICE DYNAIMCALLY IN BROADBAND WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a broadband wireless communication system, and more particularly, to a system and a method for guaranteeing end-to-end quality of service (QoS) in a broadband wireless communication system.

In the past, communication systems have been developed considering only the system's capabilities such as the system's wireless capacity and service speed. However, with the increase of service types, traffic congestion, and diversification of service demand levels of users, current communication systems are operating in consideration of QoS, which means user satisfaction as well as the capability of the system itself. Furthermore, in the wireless communication system, the amount of available resources changes due to the time-varying channel environment and the movement of the terminal, and thus, a policy considering various situations is required to guarantee the QoS. In addition, as users of broadband wireless communication systems require a variety of high-speed services, establishing a QoS policy for effectively controlling the change of radio resources and the generated traffic has emerged as a major issue.

To provide a satisfactory service to the user, end-to-end QoS must be guaranteed. The end-to-end QoS is an application layer QoS between the service provider and the terminal or between the terminal and the terminal, and means the QoS experienced by the user. In order to guarantee end-to-end QoS, an interworking procedure for ensuring overall QoS with an IP layer and a MAC layer (Media Access Control Layer) existing under the application layer is required.

However, in the current broadband wireless communication system, there is no solution for an interworking procedure for guaranteeing the QoS. The MAC layer of the broadband wireless communication system conforms to the Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard. Therefore, the MAC layer QoS processing procedure between the terminal and the base station is defined, but the terminal, the access network, and the core network are There is no general interworking procedure for QoS guarantee up to (Core Network). Accordingly, there is a need for an alternative for interworking management for guaranteeing end-to-end QoS in a broadband wireless communication system.

Accordingly, an object of the present invention is to provide a system and method for guaranteeing end-to-end quality of service (QoS) in a broadband wireless communication system.

Another object of the present invention is to provide a system and method for dynamic QoS setting in a broadband wireless communication system.

Another object of the present invention is to provide a system and method for setting a MAC layer (Media Access Control Layer) QoS in a broadband wireless communication system.

It is another object of the present invention to provide a system and method for efficient MAC layer (Media Access Control Layer) QoS setting considering resource and latency in a broadband wireless communication system.

According to a first aspect of the present invention for achieving the above object, a broadband wireless communication system, a first server for managing user class information of the terminal, and an application layer in the service request message from the terminal (Application Layer) A second server for obtaining Quality of Service (QoS) information, a control station for configuring a QoS parameter set for a lower layer of the application layer by using the application layer QoS information and the user class information; And wireless access nodes performing a service flow generation procedure of a media access control (MAC) layer by using the QoS parameter set configured by the control station.

According to a second aspect of the present invention for achieving the above object, the QoS setting method for a broadband wireless communication system, the first server, the process of managing the user class information of the terminal, and the second server from the terminal Acquiring application layer QoS information from a service request message; configuring, by the control station, a QoS parameter set for a lower layer of the application layer using the application layer QoS information and the user class information; Nodes, performing a service flow generation procedure of a MAC layer by using the QoS parameter set configured by the control station.

According to a third aspect of the present invention for achieving the above object, in a broadband wireless communication system, a control station apparatus includes a receiving unit for receiving user class information and application layer QoS information of a terminal, and using the application layer QoS information. And a transmitter for transmitting the QoS parameter set information to one of a wireless access nodes that perform a service flow generation procedure of the MAC layer and a mapper configuring a QoS parameter set for a lower layer of an application layer. do.

According to a fourth aspect of the present invention for achieving the above object, a method of operating a control station in a broadband wireless communication system includes the steps of receiving user class information and application layer QoS information of a terminal, and using the application layer QoS information. And configuring the QoS parameter set for the lower layer of the application layer, and transmitting the QoS parameter set information to one of the radio access nodes that perform the service flow generation procedure of the MAC layer. .

In the broadband wireless communication system, quality of service (QoS) information of an application layer is used to determine quality of service parameters of a lower MAC layer (Media Access Control Layer) and an IP layer (Internet Protocol Layer). By transmitting to a network entity corresponding to each, it is possible to ensure the end-to-end quality of service.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention will be described for an overall interworking technique in a communication network for setting a Dynamic Quality of Service (QoS) in a broadband wireless communication system. In the following description, the names of network entities (NEs) constituting the system are defined according to respective functions. Accordingly, the name of each network object may vary depending on the intention of the system operator or user who implements the present invention.

1 shows a schematic configuration of a broadband wireless communication system according to the present invention.

As shown in FIG. 1, the broadband wireless communication system according to the present invention includes a terminal 110, a base station 120, a control station 130, an authentication authorization accounting (AAA) server 140, and a operator management server 150. It is configured to include).

The terminal 110 is an end device for the user to access the network to use the service. In addition, the base station 120 is a device for managing radio resources for accessing the network of the terminal, and can be represented by a radio access station (RAS) or a base station (BS).

The control station 130 is a device that performs a gateway function of a subnet including a plurality of base stations, and may be represented as an access control router (ACR) or an access service network_gateway (ASN_GW). The control station 130 manages a service flow (SF), a connection, and mobility of the terminal 110. Here, the service flow is generated by dividing uplink and downlink. The control station 130 also determines specific QoS parameters by reflecting the system operator's policy for QoS.

Since the control station 130 determines the QoS parameters according to the operator policy, when the operator policy is changed, the control station 130 determines other QoS parameters even if they are the same input variable. When the operator policy is changed, alternatives to the QoS parameters determined and used before the policy change are as follows.

First, the control station 130 maintains the QoS parameters already set until the end of the service. Second, the control station 130 newly sets the QoS parameters set through the DSC (Dynamic Service Change). However, the service flow cannot be newly created or deleted. Third, the control station 130 newly sets QoS parameters already set through the DSC. However, the service flow may be newly created or deleted.

The AAA server 140 manages authentication information and charging information of the terminals. The authentication information refers to information on a service use qualification of each of the terminals with respect to terminals allowed to provide a service from a corresponding provider. The authentication information may be expressed as a user level. For example, the user level may be classified into premium, gold, silver, bronze, and the like. Here, the function of managing the user grade may be performed in a device called a subscription profile repository (SPR). The SPR may be a part of the AAA server 140 and may be included in another server or exist as a separate server.

The charging information is information about a fee that a user must bear for using a service of the terminal. Charging is charged for the time period in which the actual service flow is active. When the terminal moves, the control stations responsible for the time, intermediate and end points of the traffic flow may be different. At this time, the AAA server 140 counts the charging time by being informed of the actual serving time from each control station. Alternatively, the control station transfers the activation time information accumulated as the terminal moves to another control station, so that the AAA server 140 is notified of the accumulated activation time information from the serving control station at the end of service. Count the time. If the terminal 110 has a SIM (Subscriber Identity Module) card, the terminal 110 may directly charge. When the terminal 110 directly charges, the charging time information is provided from the AAA server 140 to the terminal 110, received from the control stations to the terminal 110, or the terminal 110. Is directly counted by).

The operator management server 150 is a device for network management of an operator and may be expressed as a Wibro System Manager (WSM) or an Element Management System (EMS). The operator management server 150 transmits information on network configuration to devices in an access service network (ASN) and manages devices in the ASN. Here, the ASN means one or more subnet sets managed by the same operator.

The QoS interworking management proposed by the present invention will be briefly described with reference to FIG. 1 as follows.

When a user wants to use a specific service using the terminal 110, the terminal 110 enters a network by performing an initial access procedure with the base station 120 and then communicates with a counterpart node according to the corresponding service. To perform. Here, if the service is Voice over Internet Protocol (VoIP), the opposite node is another terminal. If the service is video streaming, the opposite node is a service providing server.

In order to guarantee QoS of a service flow per unit (per-flow), the BS 120 and the control station 130 may use a MAC, Media Access Layer (IP), IP, etc. according to the characteristics of the service requested by the UE 110. QoS parameters of the Internet Protocol Layer and the Ethernet Layer must be set. To this end, the control station 130 checks application layer QoS information through a service request message of the application layer transmitted from the terminal 110, the base station 120 and the control station 130 Configure QoS parameters to be used in.

The control station 130 configures a QoS parameter set according to the authentication information and the application layer QoS information of the terminal. Here, the QoS parameter set includes QoS parameters of the MAC layer, the IP layer, and the Ethernet layer. For example, the MAC layer QoS parameter is a QoS parameter of Institute of Electrical and Electronics Engineers (IEEE) 802.16, the IP layer QoS parameter is a DiffServ Code Point (DSCP), and the QoS parameter of the Ethernet layer is a Class of Service (CoS). Can be However, according to the policy, the control station 130 may not directly output the DSCP and the CoS. In this case, the operator inputs a QoS table type, DSCP, CoS mapping table to the operator management server 150, so that the base station 120 and the control station 130 Reference can be made to DSCP and CoS. That is, the control station 130 marks DSCP and CoS according to the QoS class type for downlink packets, and the base station 120 determines the DSCP and CoS according to the QoS class type for uplink packets. Mark. And, for uplink traffic transmitted from the control station 130 to the core network, the control station 130 remarks that it is marked by the base station 120. In addition, the control station 130 determines a CS rule (ClaSsification Rule) for distinguishing a plurality of service flows included in one terminal. Here, although the CS rule may be different or the same for each terminal, the present invention assumes that the CS rule is set differently for each terminal, and the control station 130 determines the CS rule. For example, the reference parameter of the CS rule may be 5 tuples or 6 tuples information. The five tuple information includes a source IP address, a destination IP address, a source port, a destination port, and a protocol ID. The six tuple information includes the five tuple information and a type of service (ToS).

The QoS parameter set and the CS rule configured by the control station 130 are transferred to the terminal 110 or the base station 120 and used for setting QoS parameters in an access network. Here, the wireless access network means a network including the control station 130, the base station 120, and the terminal 110.

If the UE in the awake mode or the sleep mode moves and leaves the subnet of the anchor control station where the initial QoS parameter is set, to handover to another subnet, the QoS parameter Maintaining method is as follows. First, if the anchor control station of the handed-over terminal is not changed, the anchor control station performs tunneling with the control station of the subnet including the terminal to transmit QoS parameters to the serving base station or L2 extension ( Extension directly delivers QoS parameters to the serving base station. Here, the L2 extension means that the control station connects to the base station not included in its subnet by IP communication. In this case, when the ASN is changed, the tunneling method is preferable. When the ASN is not changed, both the tunneling method and the L2 extension method may be applied.

On the other hand, when changing the anchor control station of the handed over terminal, the anchor control station transmits the CS rule and QoS parameters to the control station of the subnet including the terminal, the control station receiving the QoS parameters to the serving base station Pass CS rules and QoS parameters.

In addition, when the terminal in the idle mode (Idle Mode) moves to hand over to another subnet out of the subnet of the anchor control station, CS rules and QoS parameters are transferred from the anchor control station to the control station of the subnet including the terminal.

In addition, when the terminal 110 performs handover between heterogeneous networks, since the QoS parameters may not be the same between the heterogeneous networks, the QoS parameters may not be transferred and used. In general, a terminal performing heterogeneous network handover performs an initial network entry process in a new system and then performs a QoS configuration procedure. As a result, a service delay occurs due to the initial network entry process. Therefore, the control station 130 may reduce the delay time until the QoS parameter setting by transmitting an input variable for QoS setting to the target system control station. The input variable transmission method is as follows.

First, the control station 130 informs the target control station of the address of the control station 130, and the target control station informs the target system control station of the address of the control station 130. The target system control station acquires an input variable in cooperation with the control station 130. Second, the control station 130 obtains the address of the target system control station from the target control station, and informs the control station 130 of the address of the target system control station. In addition, the control station 130 transmits an input variable in cooperation with the target system control station. Here, the number and type of input variables may be different between the two systems. In this case, there may be a separate switching device that is responsible for switching between different input variables. The target system control station having obtained the input variable in the above-described manner determines the QoS parameter and the CS rule using the input variable and performs DSC to reflect the new QoS parameter.

In addition, user rating information is transferred between the AAA server 140 and the target system AAA server in a manner similar to the input variable transmission method described above. And, there may be a separate conversion device for converting the user rating information.

At this time, because heterogeneous manganese is different, there is a billing problem. The billing method is as follows. First, the target system AAA server calculates the billing to be received by the target system operator according to the usage time and usage, and notifies the AAA server 140. Second, the AAA server of the target system aggregates the usage time and usage amount and notifies the AAA server 140, and the AAA server 140 calculates the charge to be paid to the target system operator.

According to an embodiment of the present invention, the charging rule may be the same as or different from the CS rule. The subject delivering the charging rule may be a control station or a SIM card embedded in the terminal, like the CS rule. In the case of the CS rule, the equipment in the ASN can be managed for the downlink, and the terminal can be managed for the uplink. However, in the case of the charging rule, the management subject varies depending on whether the subject of statistics collection is ASN or terminal. If the ASN is a subject, the equipment in the ASN manages billing for both downlink and uplink, and if the terminal is a subject, the terminal manages billing for both downlink and uplink.

Although not shown in FIG. 1, network objects that allocate IP addresses, for example, Dynamic Host Configuration Protocol (DHCP) for Simple IP and Home Agent (HA) for Mobile IP The existence of the Foriegn Agent (FA) is self-evident. In addition, although not shown in FIG. 1, the existence of a Domain Name Server (DNS) that manages a mapping relationship between NAI (Network Access Identifier) and the IP address is obvious.

2 illustrates signal exchange between network objects in a broadband wireless communication system according to a first embodiment of the present invention. 2 illustrates a case of using a one-way service, and illustrates signal exchange when a DSA (Dynamic Service Addition) is started by a terminal.

Referring to FIG. 2, the terminal 210 transmits a service request message of an application layer, for example, a SIP INVITE message, to the IMS server 240 (step 201). Here, the service request message includes application layer QoS information. For example, application layer QoS information included in the service request message is shown in Table 1 below.

 Type of information    Yes  Media type    Audio / video, port number, real time  Media properties    Codec information  Connection data information    IPv4 / IPv6, network address  Bandwidth information    Request rate (whether high or low)

In this case, the terminal 210 may transmit the SIP INVITE message only when the IP address of the IMS server 240 is known. An example of a method in which the terminal 210 obtains an IP address of the IMS server 240 is as follows. For example, when the IP address of the IMS server 240 is already stored in the terminal 210 by the terminal manufacturer, when the IP address of the IMS server 240 is input by the terminal user, the terminal When the DHCP server informs the IP address allocation of 210, there may be a case where a separate terminal 210 and the IMS server 240 are acquired through an interworking procedure.

Upon receiving the SIP INVITE message, the IMS server 240 requests authentication information of the terminal 210 from the AAA server 250 (step 203).

The AAA server 250 receiving the request for authentication information transmits authentication information for the terminal 210 to the IMS server 240 (step 205). For example, the authentication information may be user rating information of the terminal 210. Here, the user grade is determined by a service policy, and may be classified, for example, as premium, gold, silver, bronze, or the like.

The IMS server 240 having obtained the authentication information confirms that the terminal 210 is entitled to the service, and transmits the service request message, for example, a SIP INVITE message to the service providing server 260. Transmit (step 207). In this case, when the terminal 210 uses an identifier other than an IP address as destination information when transmitting a message, the IMS server 240 acquires an IP address of the service providing server 260 in cooperation with a DNS server. Afterwards, the SIP INVITE message is transmitted.

Upon receiving the SIP INVITE message, the service providing server 260 transmits a response message to the control station 230, for example, a SIP 183 message (step 209).

Subsequently, the control station 230 configures a QoS parameter set for the service flow requested by the terminal 210 based on the QoS information and the authentication information of the application layer included in the service request message, and the CS rule. And determine the charging rule (step 211). Here, the QoS parameter set includes a MAC layer QoS parameter and an IP layer QoS parameter. For example, the QoS parameter set includes the parameters shown in Table 2 and Table 3 below. Table 2 below shows QoS parameters of the MAC layer specified in the IEEE 802.16 standard, and Table 3 below shows QoS parameters proposed by the present invention.

  parameter   Explanation  SFID   Service flow identifier  Traffic priority   Priority between services if the QoS parameters are identical  Maximum Sustained Traffic Rate   Maximum allowed transfer rate of SDU  Maximum Traffic Burst   Maximum amount of data that can be sent at one time  Minimum Reserved Traffic Rate   Minimum guaranteed rate of SDU  Maximum Latency   Maximum delay from CS to radio transmission  Tolerated jitter   Permissible value of delay time change  Uplink Grant Scheduling Type   Type of uplink polling service  Unsolicited Grant Interval   Grant time interval for uplink UGS  Unsolicited Polling Interval   Polling time interval for uplink rtPS  SDU Size   Only use if fixed size  Time base   Unit time for rate measurement

 parameter  Explanation  Whether the IP header is compressed and how it is compressed 1.No compression 2.PHS (Payload Header Suppression) method 3.ROHC (RObust Header Compression) method Whether to use a Traffic Encryption Key (TEK) DSC Allowed Maximum number of DSCs allowed per service flow  Handling of QoS Parameters Not Exchanged Through DSC  1. A way to reuse old values. 2. Using the system's initialization values. 3. The QoS parameter is not supported. Whether to allow active service flows to switch to provisional service flows using DSC   In the preliminary service flow, SFID exists. It means service flow without traffic movement. Whether to allow status transition timers from active to redundant by service flow   Lower priority than existing idle timers and sleep timers. State transition timer value from active to reserve per service flow Service Reliability  Target Error Rate, etc.  Call Release Condition  Duration threshold when the minimum transfer rate is not met. Whether to perform an Automatic Repeat reQuest (ARQ)   Symmetric service?  Whether to raise the service level of the other terminal temporarily to its own level at the cost of the two-way service request such as VoIP and the terminal with the relatively low class of service. Is it possible to handover to another provider's network using the same wireless technology?  Show tolerance if the Network Access Provider (NAP) or Network Service Provider (NSP) is different Is it possible to handover to another wireless network using another wireless technology?  Show tolerance if NAP or NSP are different   How to handle an initial access request that exceeds the awake mode terminal limit  1.Forcibly switching among the awake mode terminals that are connected to a low priority terminal that does not flow for a certain time to sleep mode or idle mode. 2. Allow initial access to Idle mode. 3. Allows initial access to sleep mode. However, if the sleep mode terminal limit is exceeded, initial access to the idle mode is allowed.  Maximum allowable uplink bandwidth, maximum allowable downlink bandwidth, maximum allowable uplink / downlink bandwidth sum  Number of acceptable QoS service flows and number of best effort (BE) service flows  Number of uplink / downlink can be set separately

QoS parameters as shown in Table 2 and Table 3 are set for the requested service flow. Here, the parameters shown in Table 2 may be configured differently or defined by different names according to the standard applied to the system. In this case, even a single service flow may be set by classifying QoS parameters according to data types. Among various data transmitted and received through one service flow, there may be data that should not be lost due to being relatively important. In this case, data that should not be lost should guarantee a relatively high level of QoS. Therefore, it is necessary to differentiate QoS parameters by data type. For example, the higher the importance of data, the greater the number of retransmissions.

Subsequently, the control station 230 transmits an application layer message including a QoS parameter set, for example, a SIP 183 message, to the terminal 210 (step 213). Here, the control station 230 may transmit the QoS parameter set through a separate application layer message. In addition, the application layer message may include at least one of a CS rule and a charging rule.

The terminal 210 receiving the QoS parameter set starts a DSA. That is, the terminal 210 transmits a DSA-REQ message to the base station 220 (step 215). Here, the DSA-REQ message includes the QoS parameter set. In addition, when QoS parameters are differentiated according to data types, the DSA-REQ message includes type-specific QoS parameter information configured in an array form. In this case, a name tag for distinguishing a service between the terminal 210 and the control station 230 is required. Therefore, the terminal 210 generates and uses a specific name tag for each service flow to perform the DSA. For example, a PRID (PRovisioning instance ID) may be used as the name tag, and the PRID is a value for identifying an instance of a policy class.

Upon receiving the DSA-REQ message, the base station 220 checks the MAC layer QoS parameter included in the DSA-REQ message and performs Call Admission Control (CAC) using the MAC layer QoS parameters (step 217). .

If the CAC result call (Call) is accepted, the base station 220 accepts the call to the control station 230, that is, the base station 220 to the control station 230 for the terminal 210 Notify that resource reserve is available.

Upon receipt of the call acceptance, the control station 230 determines whether to allow the requested service. In this case, it is assumed that the service is allowed. Accordingly, the control station 230 generates a service flow for the service and allocates a service flow ID (step 221). Here, the method of determining whether to allow the service of the control station 230 is as follows.

First, the control station 230 determines according to whether the base station 220 accepts the call. That is, the control station 230 allows a service when the call is accepted by the base station 220. Second, the control station 230 directly obtains the QoS allowance range information of the corresponding terminal. In the second scheme, the control station 230 must obtain the QoS tolerance information. In this case, the control station 230 may obtain the QoS allowance range information from the AAA server 250 or the operator management server. When the QoS allowance range information is provided from the AAA server 250, the control station 230 may perform ASN initial operation or change the QoS allowance range information after the authentication of steps 303 and 305 is completed. Obtain the QoS tolerance information from the AAA server 250.

After allowing the service according to one of the methods described above, the control station 230 notifies the base station 220 that the service is allowed (step 223).

The base station 220 notified that the service is allowed transmits a DSA-RSP message to the terminal 210 (step 225), and the terminal 210 transmits a DSA-ACK message to the base station 220 ( Step 227).

Thereafter, the service providing server 260 transmits a service processing notification message, that is, a SIP 200 OK message to the terminal 210 (step 229), and transmits service data (step 231).

In the interworking procedure described with reference to FIG. 2, after the base station performs CAC, the control station determines whether to allow the service. However, at the time when the terminal transmits the DSA-REQ message, the service flow ID for the corresponding service is not assigned. Therefore, according to another embodiment of the present invention, the base station may perform CAC after the control station determines whether to allow the service and allocates the service flow ID.

3 illustrates signal exchange between network objects in a broadband wireless communication system according to a second embodiment of the present invention. 3 illustrates a case in which a terminal uses a unidirectional service, and illustrates a signal exchange when a DSA is started by a base station.

Referring to FIG. 3, the terminal 310 transmits a service request message of an application layer, for example, a SIP INVITE message, to the IMS server 340 (step 301). Here, the service request message includes application layer QoS information. For example, QoS information included in the service request message is shown in Table 1.

In this case, the terminal 310 needs to know the IP address of the IMS server 340 to transmit the SIP INVITE message. An example of a method in which the terminal 310 obtains an IP address of the IMS server 340 is as follows. For example, when the IP address of the IMS server 340 is already stored in the terminal 310 by the terminal manufacturer, when the IP address of the IMS server 340 is input by the terminal user, the terminal When the DHCP server notifies when the IP address is allocated at 310, there may be a case where a separate terminal 310 is obtained through an interworking procedure of the IMS server 340.

Upon receiving the SIP INVITE message, the IMS server 340 requests authentication information of the terminal 310 from the AAA server 350 (step 303).

The AAA server 350 receiving the request for authentication information transmits the authentication information for the terminal 110 to the IMS server 340 (step 305). For example, the authentication information may be user rating information of the terminal 110. Here, the user grade is determined by a service policy, and may be classified, for example, as premium, gold, silver, bronze, or the like.

The IMS server 340 acquiring the authentication information confirms that the terminal 310 is entitled to the service, and transmits the service request message, for example, a SIP INVITE message to the service providing server 360. Transmit (step 307). In this case, when the terminal 110 uses an identifier other than an IP address as destination information when transmitting a message, the IMS server 340 acquires the IP address of the service providing server 360 in conjunction with DNS. After that, the SIP INVITE message is transmitted.

Upon receiving the SIP INVITE message, the service providing server 360 transmits a response message to the SIP INVITE message, for example, a SIP 183 message, to the control station 330 (step 309).

Subsequently, the control station 330 configures a QoS parameter set for the service requested by the terminal based on the QoS information of the application layer and the authentication information, and determines a CS rule and a charging rule (step 311). For example, the QoS parameter set includes the parameters shown in Table 2 and Table 3. The information shown in Table 2 is the QoS parameters of the MAC layer specified in the IEEE 802.16 standard, and the information shown in Table 3 is the QoS parameters proposed by the present invention. QoS parameters as shown in Table 2 and Table 3 are set for the requested service flow. In this case, even one service flow may be set by classifying QoS parameters according to data types.

Subsequently, the control station 330 transmits QoS parameter information for the service requested by the terminal to the base station 320 (step 313).

Upon receiving the QoS parameter information, the base station 320 checks the MAC layer QoS parameter received from the control station 330 and performs CAC based on the MAC layer QoS parameter (step 315).

If the CAC result call is accepted, the base station 320 notifies the control station 330 of the call acceptance (step 317). That is, the base station 320 notifies the control station 330 that the resource margin for the terminal 310 is secured.

The control station 330 notified of the call acceptance generates a service flow for the requested service and assigns a service flow ID (step 319).

Subsequently, the base station 320 allocates a TCID (Traffic Connection ID) to the terminal 310 and transmits a DSA-REQ message including a MAC layer QoS parameter using the TCID (step 321).

After receiving the DSA-REQ message, the terminal 310 confirms the DSA-REQ message, creates a connection by opening a physical port and forming a traffic interface between layers, and the base station. In step 323, the DSA-RSP message is transmitted.

Upon receiving the DSA-RSP message, the base station 320 transmits a DSA-ACK message to the terminal 310 (step 325).

Thereafter, the service providing server 360 transmits a service processing notification message, that is, a SIP 200 OK message to the terminal 310 (step 327), and transmits service data (step 329).

In the embodiment described with reference to FIGS. 2 and 3, application layer QoS parameters are exchanged using the SIP protocol. Using the SIP protocol is one embodiment, and other application layer protocols may be used according to other embodiments. For example, when the HTTP protocol is used according to another embodiment, the IMS server is replaced with a web server.

QoS parameters and CS rules for a service flow are set through the above-described procedure. At this time, the state of the service flow is divided into an active state, an admitted state, and a provisioned state according to a traffic exchange state and a resource occupancy state. The active state means a state in which traffic is exchanged by occupying radio resources. The permission state refers to a state in which a service flow IDentifier (SFID) and a traffic connection IDentifier (TCID) are allocated and reserved radio resources, but no radio resources are allocated. The ready state means a state in which only QoS parameter information is maintained without being assigned an SFID. The above-described service operation for each service flow is valid when the terminal is in the awake mode, and when the terminal is in the sleep mode or the idle mode, the service flow state when the terminal is in the awake mode is stored. In the sleep mode, the active state or the permit state is basically a resource reservation only state, and the active state is a state in which resources can be allocated to a listening interval. In both the active and allowed states, one may consider the case where resource reservation is not even possible. In the idle mode, neither resource reservation nor allocation is made.

Basically, the change of the service flow state is made through the DSC procedure, and in a special case, the service flow state may be changed without the DSC procedure according to the system and the terminal's promise. For example, when the terminal changes from the idle mode to the awake mode. If the existing service flow status is active or allowed, CAC is performed. At this time, in the case of the service flow for which the CAC is not allowed, the system and the terminal each transition the service flow to a ready state without a DSC procedure or delete the service flow.

In the dynamic QoS setting scheme according to the present invention, it is preferable that the service flow state exists only in an active state or a permit state, or exists only in an active state. This is because, in the dynamic QoS setting method, the terminal and the system add the service flow through the DSA when it is needed and delete the management information of the service flow through the DSD procedure when the service flow is not needed.

In exceptionally case where there is a ready state, DSC triggering for service flow state transition is performed by traffic generation or by a command of a higher layer. For example, when the base station recognizes downlink traffic generation, the base station starts a DSC for the corresponding service flow, that is, transmits a DSC-REQ message to the terminal. When the terminal detects the uplink traffic, the terminal starts the DSC for the corresponding service flow, that is, transmits a DSC-REQ message to the base station. The active state transition of the service flow in the permitted state is also performed similarly to the active state transition in the ready state.

Assume that the service flow management state of the awake mode is active. When the terminal transitions from the awake mode to the sleep mode and returns to the awake mode, the service flow that was active in the awake mode is transitioned back to the active state.

The above descriptions are embodiments for configuring QoS when adding a new service flow through a DSA procedure. After the QoS is set through the DSA procedure, the QoS setting of the service flow may be changed through the DSC procedure. When the QoS change request occurs in the terminal, the application layer of the terminal triggers the MAC layer of the terminal to transmit the DSC-REQ message, and the ASN transmits the QoS change request in PDF. In addition, the PDF determines the request of the terminal and transmits whether to allow the QoS change to the ASN, and the ASN delivers the DSC response message to the terminal. As another case in which DSC is performed, there is a case in which the determination of the base station is performed regardless of the request of the terminal. For example, if the capacity of the backbone network is insufficient or the policy of the operator is changed, the base station recognizes that the QoS parameter or CS rule of the service flow in use should be changed. In this case, the DSC procedure starts from the base station.

4 is a block diagram of a control station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the control station controls the communication unit 402, the message processing unit 404, the data processing unit 406, the QoS mapper 408, the SF management unit 410, and the control unit 412. It is configured to include.

The communication unit 402 provides an interface for communicating with other network objects in the system, that is, a base station, an AAA server, an operator management server, and the like. Although not shown, the communication unit 402 is classified into a transmitter for transmitting a signal and a receiver for receiving a signal.

The message processor 404 generates and interprets control messages exchanged with other network objects in the system. For example, the control message includes a message for exchanging authentication information of the terminal, a message for notifying the SFID of the service requested by the terminal, a message received from the base station for notifying the CAC result of the service, and the like. Here, the authentication information refers to information on the service use qualification of each of the terminals for the terminals that are allowed to provide the service from the service provider. The authentication information may be expressed as a user rating. For example, the user rating may be classified into premium, gold, silver, bronze, and the like.

The data processor 406 processes user data exchanged with the terminal. That is, the data processor 406 identifies the receiving terminal of the user data provided from the core network, and routes the user data so that the user data is delivered to the confirmed terminal.

The QoS mapper 408 configures a QoS parameter set of the IP layer and the MAC layer by using the application layer QoS parameters and the authentication information of the terminal for the service requested by the terminal. For example, the application layer QoS parameters are shown in Table 1, and the QoS parameters of the IP layer and the MAC layer include information as shown in Table 2 and Table 3. In addition, the QoS mapper 408 determines a CS rule for distinguishing a plurality of service flows owned by one terminal.

The SF manager 410 allocates an SFID to a service flow of the terminal, and maintains and manages status information of the assigned SFIDs. In addition, the SF manager 410 determines whether to allow the requested service when a service request is generated from the terminal. At this time, the service acceptance determination method is as follows. First, the SF management unit 410 determines according to whether the base station accepts the call. That is, the SF management unit 410 allows a service when the call is accepted by the base station. Second, the SF management unit 410 directly obtains the QoS allowance range information of the corresponding terminal.

The controller 412 controls the overall function of the control station. For example, the controller 412 performs an interworking procedure with an AAA server for obtaining authentication information of the terminal when a service request is generated from the terminal. In addition, the controller 412 obtains and provides QoS allowance range information for determining whether to allow the service of the SF manager 410. Here, the QoS allowance range information may be obtained from the AAA server or the operator management server. When the QoS allowance range information is provided from the AAA server, the controller 412 obtains the QoS allowance range information from the AAA server when the ASN is initially driven after the authentication information is received or when the QoS allowance range information is changed. do.

5 is a flowchart illustrating an operation procedure of a control station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, in step 501, the control station checks whether authentication information of a terminal requesting a service and application layer QoS information for the requested service are received. For example, the application layer QoS information includes the information as shown in Table 1. The authentication information refers to information on a service use qualification of each of the terminals with respect to terminals allowed to provide a service from a corresponding operator. The authentication information may be expressed as a user rating. For example, the user rating may be classified into premium, gold, silver, bronze, and the like.

When the authentication information and the application layer QoS information are received, the control station proceeds to step 503 to configure a QoS parameter set of the IP layer and the MAC layer, and to distinguish a plurality of service flows owned by one terminal. Determine the rule. QoS parameters of the IP layer and the MAC layer include information as shown in Table 2 and Table 3.

The control station then proceeds to step 505 to transmit the QoS parameter set information to a radio access node that initiates a service flow generation procedure of the MAC layer, e.g., a DSA procedure. Here, the radio access node means a base station or a terminal.

After transmitting the QoS parameter set information, the control station proceeds to step 507 to check whether the call for the service is accepted from the base station. That is, the control station confirms the CAC result of the base station. If the call is not accepted, the control station ends this procedure.

On the other hand, if the call is accepted, the control station proceeds to step 509 to generate a service flow and assign an SFID to the service flow. At this time, when the service flow generation procedure of the MAC layer is started by the terminal, the control station determines whether to allow the service. The service decision method is as follows. First, the control station determines according to whether the base station accepts the call. That is, the control station permits the service when the call is accepted at the base station. Second, the control station directly determines by obtaining the QoS allowance information of the corresponding terminal. Here, the QoS allowance range information may be obtained from the AAA server or the operator management server. When the QoS allowance range information is provided from the AAA server, the control station obtains the QoS allowance range information from the AAA server at the time of initial driving of the ASN or when the QoS allowance range information is changed after receiving authentication information.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram showing a schematic configuration of a broadband wireless communication system according to the present invention;

2 is a diagram illustrating a signal exchange between network objects in a broadband wireless communication system according to a first embodiment of the present invention;

3 is a diagram illustrating a signal exchange between network objects in a broadband wireless communication system according to a second embodiment of the present invention;

4 is a block diagram of a control station in a broadband wireless communication system according to an embodiment of the present invention;

5 is a diagram illustrating an operation procedure of a control station in a broadband wireless communication system according to an embodiment of the present invention.

Claims (25)

In a broadband wireless communication system, A first server managing user class information of the terminal; A second server for obtaining Application Layer Quality of Service (QoS) information from a service request message from the terminal; A control station for configuring a QoS parameter set for a lower layer of the application layer by using the application layer QoS information and the user class information; And wireless access nodes for performing a service flow generation procedure of a media access control (MAC) layer using the QoS parameter set configured by the control station. The method of claim 1, The control station, MAC layer QoS parameters, Internet Protocol Layer (IP) QoS parameters, whether or not an Intermediate Protocol (IP) header is compressed and compressed, whether a traffic encryption key (TEK) is used, whether dynamic service change (DSC) is allowed, and service flow Number of DSC allowances per service flow, whether or not to allow provision of service flows for active service flows using DSC, whether to allow status transition timers from active to spare by service flow, and status transition timer values by service flow , Service reliability, call force release condition, whether to perform ARQ (Automatic Repeat reQuest), Symmetric service, whether to handover to another provider's network using the same wireless technology, Whether handover to other wireless network is possible, initial access request processing method exceeding Awake Mode terminal limit, maximum allowable uplink And configuring a QoS parameter set including at least one of a bandwidth, a maximum allowable downlink bandwidth, a maximum allowable uplink / downlink bandwidth sum, an allowable number of QoS service flows, and a number of best effort (BE) service flows. system. The method of claim 1, The application layer QoS information includes at least one of media type information, port number, real time status, codec information, network address, IP format, and request rate. The method of claim 1, The radio access nodes comprise a terminal and a base station. The method of claim 4, wherein The base station communicates with the terminal through a wireless channel, performs call admission control (CAC) based on the QoS parameter set, And if the control station is informed that the CAC result call has been accepted, the control station determines whether to allow the service with reference to the QoS parameter set. The method of claim 5, The control station, after the authentication is completed for the terminal, obtains QoS allowance range information for the terminal from the first server, and determines whether to allow the service based on the QoS allowance range information. The method of claim 5, The control station, if the CAC result call of the base station is accepted, the system, characterized in that for allowing the service without additional procedures. The method of claim 1, The control station classifies a data type according to importance in one service flow and sets different QoS parameters for each data type. In the method of setting the quality of service (QoS) in a broadband wireless communication system, Managing, by the first server, user class information of the terminal; Obtaining, by a second server, application layer QoS information from a service request message from the terminal; Configuring, by the control station, a QoS parameter set for a lower layer of the application layer by using the application layer QoS information and the user class information; Radio access nodes, performing a service flow generation procedure of a media access control (MAC) layer using the QoS parameter set configured by the control station. The method of claim 9, The QoS parameter set is MAC layer QoS parameters, Internet Protocol Layer (IP) QoS parameters, whether or not an Intermediate Protocol (IP) header is compressed and compressed, whether a traffic encryption key (TEK) is used, whether dynamic service change (DSC) is allowed, and service flow Number of DSCs allowed per service flow, whether to allow provision of active service flows for active service flows using DSC, whether to allow status transition timers from active to spare by service flow, and status transition timers by service flow Value, service reliability, call forcible release condition, whether to perform ARQ (Automatic Repeat ReQuest), Symmetric service, whether to handover to another provider's network using the same wireless technology, use different wireless technology Whether handover to other wireless network is possible, initial access request processing method exceeding Awake Mode terminal limit, maximum allowable uplink Bandwidth, maximum allowable bandwidth down-link, the maximum allowable uplink / downlink bandwidth sum acceptable QoS service flow number, BE (Best Effort) characterized in that comprises at least one of a number of service flows. The method of claim 9, The application layer QoS information includes at least one of media type information, port number, real time status, codec information, network address, IP format, and required transmission rate. The method of claim 9, And wherein the radio access nodes comprise a terminal and a base station. The method of claim 12, Performing, by the base station, call admission control (CAC) based on the QoS parameter set; And when the control station is informed that the CAC result call has been accepted, determining whether to allow the service with reference to the QoS parameter set. The method of claim 13, The process of determining whether to allow the service, Acquiring, by the control station, QoS allowance range information for the terminal from the first server after authentication of the terminal is completed; Determining whether to allow a service based on the QoS tolerance information. The method of claim 13, The process of determining whether to allow the service, And if the control station accepts the CAC result call of the base station, allowing the service without a separate procedure. The method of claim 9, The process of configuring the QoS parameter set, And classifying a data type according to importance in one service flow and differently setting QoS parameters for each data type. A control station apparatus in a broadband wireless communication system, A receiver for receiving user class information and application layer (QoS) quality of service (QoS) information of the terminal; A mapper for configuring a QoS parameter set for a lower layer of the application layer by using the application layer QoS information; And a transmitter for transmitting the QoS parameter set information to one of radio access nodes that perform a service flow generation procedure of a media access control (MAC) layer. The method of claim 17, The mapper is MAC layer QoS parameters, Internet Protocol Layer (IP) QoS parameters, whether or not an Intermediate Protocol (IP) header is compressed and compressed, whether a traffic encryption key (TEK) is used, whether dynamic service change (DSC) is allowed, and service flow Number of DSCs allowed per service flow, whether to allow provision of active service flows for active service flows using DSC, whether to allow status transition timers from active to spare by service flow, and status transition timers by service flow Value, service reliability, call forcible release condition, whether to perform ARQ (Automatic Repeat ReQuest), Symmetric service, whether to handover to another provider's network using the same wireless technology, use different wireless technology Whether handover to other wireless network is possible, initial access request processing method exceeding Awake Mode terminal limit, maximum allowable uplink And configuring a QoS parameter set including at least one of a bandwidth, a maximum allowable downlink bandwidth, a maximum allowable uplink / downlink bandwidth sum, an allowable number of QoS service flows, and a number of best effort (BE) service flows. Device. The method of claim 17, The application layer QoS information includes at least one of media type information, port number, real time status, codec information, network address, IP format, and request rate. The method of claim 17, And the wireless access nodes comprise a terminal and a base station. The method of claim 20, And receiving a notification from the base station that the CAC result call has been accepted, wherein the control unit determines whether to allow the service by referring to the QoS parameter set. A method of operating a control station in a broadband wireless communication system, Receiving user class information and application layer (QoS) quality of service (QoS) information of the terminal; Configuring a QoS parameter set for a lower layer of the application layer by using the application layer QoS information; And transmitting the QoS parameter set information to one of wireless access nodes performing a service flow generation procedure of a media access control (MAC) layer. The method of claim 22, The QoS parameter set is MAC layer QoS parameters, Internet Protocol Layer (IP) QoS parameters, whether or not an Intermediate Protocol (IP) header is compressed and compressed, whether a traffic encryption key (TEK) is used, whether dynamic service change (DSC) is allowed, and service flow Number of DSCs allowed per service flow, whether to allow provision of active service flows for active service flows using DSC, whether to allow status transition timers from active to spare by service flow, and status transition timers by service flow Value, service reliability, call forced release condition, whether to perform ARQ (Automatic Repeat ReQuest), Symmetric service, whether to handover to other provider's network using the same wireless technology, and other wireless technologies. Whether handover to other wireless network is available, initial access request processing method exceeding Awake Mode terminal limit, maximum allowable uplink Bandwidth, maximum allowable bandwidth down-link, the maximum allowable uplink / downlink bandwidth sum acceptable QoS service flow number, BE (Best Effort) characterized in that comprises at least one of a number of service flows. The method of claim 22, The application layer QoS information includes at least one of media type information, port number, real time status, codec information, network address, IP format, and required transmission rate. The method of claim 22, And wherein the radio access nodes comprise a terminal and a base station.

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