KR101104708B1 - Method And System for Paging Personal Subscriber Station in Wibro Network - Google Patents

Abstract

The present invention relates to a method and system for paging a PSS in a WiBro network.

The present invention relates to a method for paging a personal subscriber station (PSS) to a specific FA by a radio access station (RAS) operating as a multi frequency allocation (FA) in a WiBro network, the specific FA comprising: (a) Whenever the PSS performs a DREG procedure to switch from a normal operation mode to an idle mode or performs location registration, the FA where the DREG procedure or the location registration is performed (hereinafter, referred to as “PSS”). FA "); (b) PSS FA information including the PSS FA determined in step (a) as a paging controller for making a paging request to the RAS and managing location information of the PSS when a paging event to the PSS occurs. Sending a message to cause the paging controller to update and store the PSS FA information; And (c) performing a paging procedure to the PSS using the PSS FA when the paging event occurs to the PSS and receives the PSS FA information from the paging controller. It provides a method for paging.

According to the present invention, the RAS does not need to page the PSS to all the FAs assigned to it, so that the paging procedure can be performed only to a specific FA, so that limited frequency resources can be efficiently operated, and the DREG procedure generally performed by the PSS. However, since a specific FA is selected by using location registration, there is no need to use a separate equipment or complicated algorithm to select a specific FA among multiple FAs allocated to RAS.

Wibro, Mobile Internet, FA, Allocation

Description

Method and system for paging pss in wibro network {Method And System for Paging Personal Subscriber Station in Wibro Network}

1 is a view briefly showing a specific FA selection method used in a conventional wireless communication system,

2 is a diagram showing the configuration of a system for paging a PSS in a WiBro network according to a preferred embodiment of the present invention;

3 is a diagram illustrating a method for paging a PSS in a WiBro network according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

200: PSS 210: RAS

220: ACR 230: IP network

240: paging controller 250: HA

260: AAA 270: Internet

The present invention relates to a method and system for paging a personal subscriber station (PSS) in a WiBro network. More specifically, whenever the PSS performs a procedure for switching from the normal execution mode to the idle mode or performs location registration, a radio access station (RAS) is referred to as the above procedure or the above. Determining the frequency assignment (FA) where location registration is performed (hereinafter referred to as “FA”), transmits and updates / stores the FA information of the PSS to the paging controller, and a paging event to the PSS is generated from the paging controller. The present invention relates to a method and system for paging a PSS in a WiBro network that performs a paging procedure to the PSS using the FA included in the received FA information when receiving the FA information of the PSS together with the paging request message.

As computer, electronic, and communication technologies have made rapid progress, various wireless communication services using wireless networks have been provided. Accordingly, a service provided by a mobile communication system using a wireless communication network is developing not only a voice service but also a multimedia communication service for transmitting data such as circuit data, packet data, and the like.

Recently, IMT-2000 (International Mobile Telecommunication 2000) (eg, CDMA (Code Division Multiple Access) 2000 1X, 3X, EV-DO), a third generation mobile communication system that has been standardized by ITU-R due to the development of information communication. And WCDMA (WideBand CDMA) are commercially available. IMT-2000 is a mobile communication system aimed at realizing direct roaming worldwide including personal mobility and service mobility, the same level of call quality as wired telephone, high speed packet data service and various application services by combining wired and wireless network. As a result, as well as improving existing voice and WAP service quality, various multimedia services (AOD, VOD, etc.) may be provided at a higher speed.

However, the existing mobile communication system has a limitation in providing high-speed wireless Internet due to a high base station construction cost and high usage rate of the wireless Internet, and a limited screen size of the mobile communication terminal. In addition, wireless local area network (WLAN) technology has limitations in providing public services due to problems such as radio wave interference and a narrow coverage area. Therefore, WiBro (Wireless Broadband Internet), a high-speed portable Internet service that guarantees portability and mobility and can use high-speed wireless Internet service at a low price, has emerged.

WiBro service uses various types of portable mobile terminals such as laptops, PDAs, and handheld PCs to access various information and contents through internet access in indoor and outdoor stationary environments and mobile environments with walking speeds and low to medium speeds. It is a service. WiBro system uses the 2.3 GHz frequency band and provides mobility of 60 km / h per hour. The downlink transmission rate is 24.8 Mbps, but the uplink transmission rate is 5.2 Mbps. System.

The WiBro system uses Time Division Duplex (TDD) as a duplex method and Orthogonal Frequency Division Multiple Access (OFDMA) / Time Division Multiple Access (TDMA) as a multiple access method to effectively use the allocated frequency spectrum. ).

Here, the TDD scheme is a bidirectional transmission scheme in which downlinks and uplinks are alternately assigned in time in the same frequency band.

In addition, OFDMA / TDMA is a multiple access method similar to TDMA, in which all subcarriers spread over the entire bandwidth are allocated to one user for a predetermined time period and to another user for the next predetermined time. (Multipath) has the property to prevent interference.

On the other hand, in the wireless communication system, the number of FAs (Frequency Assignment) operated by each base station is limited. Therefore, the base station needs a procedure for selecting an FA to form a call channel with a plurality of terminals using a wireless communication system in order to efficiently operate limited frequency resources.

In the existing CDMA 2000 1x system, a particular FA is selected from a plurality of FAs using a hashing method, and other FD (Forced Distribution) or OFD (Optional Forced Distribution) methods are used.

1 is a diagram briefly illustrating a specific FA selection method used in a conventional wireless communication system.

The hashing method is a method of uniformly allocating a mobile identification number (MIN) to each FA using a hashing function as shown in FIG. 1A.

In the FD method, as shown in FIG. 1B, when a subscriber attempts to make a call, the base station forcibly allocates a call to the FA having the smallest call volume.

The OFD method is a mixed form of hashing and FD. If the threshold is set and the call amount is below the threshold, the FA is allocated by the hashing method as shown in FIG. 1C. If the call amount is above the threshold, the FD method is used as shown in FIG. How to allocate FA.

Thus, the existing wireless communication system defines a method of selecting a specific FA among a plurality of FAs in order to efficiently manage network resources, so when paging from a base station to a terminal, paging to a specific FA instead of the entire FA. You can try

However, in the WiBro system, unlike a conventional wireless communication system, a method for selecting a specific FA among a plurality of FAs is not defined in the standard. Therefore, in order to efficiently manage network resources, a method of selecting and paging a specific FA from a plurality of FAs is urgently required.

In order to meet such a demand, the present invention provides a method in which the RAS determines the FA in which the above procedure or location registration is performed every time the PSS performs a procedure for switching from the normal execution mode to the idle mode or performs the location registration. When the FA information is transmitted to the paging controller to update / store, and when a paging event occurs to the PSS and receives the FA information of the PSS together with the paging request message from the paging controller, the paging to the PSS is performed using the FA included in the received FA information. An object of the present invention is to provide a method and system for paging a PSS in a WiBro network performing a procedure.

In order to achieve this object, the present invention provides a radio access station (RAS: Radio Access Station, RAS) operating as a Multi Frequency Assignment (FA) in a WiBro network. A method of selecting a specific FA and paging a personal subscriber station (PSS) to a specific FA, the method comprising: (a) the PSS is in a normal operation mode; Determining a FA (hereinafter referred to as a "PSS FA") in which the procedure or the location registration is performed each time a procedure for switching to the idle mode or performing location registration in the UE; (b) PSS FA information including the PSS FA determined in step (a) as a paging controller for making a paging request to the RAS and managing location information of the PSS when a paging event to the PSS occurs. Sending a message to cause the paging controller to update and store the PSS FA information; And (c) performing a paging procedure to the PSS using the PSS FA when the paging event occurs to the PSS and receives the PSS FA information from the paging controller. It provides a method for paging.

For still another object of the present invention, the present invention provides a personal subscriber station (PSS) as a specific FA by selecting a specific FA among multi frequency assignments (FA) in a WiBro network. A system for paging a Personal Subscriber Station (hereinafter referred to as a "PSS"), wherein the PSS performs a procedure for switching from a normal operation mode to an idle mode or registering a location. Every time the PRS FA is determined, the FA or the location registration is performed (hereinafter, referred to as a "PSS FA") to generate PSS FA information including the PSS FA, and a paging event to the PSS is generated to paging. A radio access station (RAS: Radio Access Station (RAS)) for performing a paging procedure to the PSS using the PSS FA when receiving a request; Manages the location information of the PSS and updates and stores the PSS FA information received from the RAS, and if the paging event to the PSS occurs, the RAS that manages the PSS by referring to the location information of the PSS; A paging controller for transmitting PSS FA information; And an access control router (ACR) for receiving packet data from an external Internet network, performing a packet routing function, and transmitting and receiving various signals and messages including the PSS FA information between the RAS and the paging controller. It provides a system for paging the PSS in a WiBro network, characterized in that "ACR".

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear.

2 is a diagram showing the configuration of a system for paging a PSS in a WiBro network according to a preferred embodiment of the present invention.

A system for paging a PSS in a WiBro network according to a preferred embodiment of the present invention includes a Personal Subscriber Station (PSS) (hereinafter referred to as "PSS") 200, a Radio Access Station (RAS) &Quot; RAS ") 210, access control router (ACR) " ACR " (220), IP network 230, paging controller 240, home agent ( HA: Home Agent (hereinafter referred to as "HA") 250, authentication and billing server (AAA: Authentication Authorization, Accounting, referred to as "AAA") 260, and the Internet 270.

PSS 200 according to a preferred embodiment of the present invention refers to a mobile communication terminal that can use a high-speed wireless Internet service by connecting to a WiBro network, a low power RF (Radio Frequency) / IF (Intermediate Frequency) module and controller functions, services A MAC frame variable control function, a handover function, an authentication and encryption function, etc. according to characteristics and a propagation environment are provided.

In particular, when the PSS 200 attempts to switch from the normal operation mode in which the traffic channel is open to the idle mode for power saving, the PSS 200 transmits the information to the RAS 210. Through this, the WiBro network knows that the PSS 200 has been switched to the idle mode. This process is referred to as a "deregistration (DREG)" procedure, where the idle mode is periodically from the RAS 210 while the PSS 200 is not registered with the RAS 210. This refers to a state of checking only a paging message, and is a concept introduced for the purpose of preventing overhead due to power saving and frequent handover of the PSS 200.

In addition, the PSS 200 performs location registration with the RAS 210. If the WiBro network does not know the location of the PSS 200, since the paging signal must be transmitted through all the RAS 210 installed in the network, the load of the system increases. Therefore, the PSS 200 registers its location in the WiBro network in advance, and when a paging event occurs in the PSS 200, the WiBro network performs a paging message through the RAS 210 that manages the location registered by the PSS 200. Will be sent.

Location registration of the PSS 200 is powered on (Power-Up Registration), or powered off (Power-Down Registration), or when the location registration period preset in the PSS 200 has arrived (Time-Based). Registration), or when a change in the paging group occurs due to movement between paging groups managed by one RAS 210 (Paging Group Registration). In addition, IEEE 802.16e refers to "MAC Hash Skip Threshold Registration." Such location registration is performed by inserting location information in a RNG-REQ (Ranging-Request) message among MAC-related messages defined by WiBro and transmitting the location information to the RAS 210.

The RAS 210 according to a preferred embodiment of the present invention transmits data received from the ACR 220 to the PSS 200 wirelessly as a base station of a WiBro network, and provides a low power RF / IF module and controller function and an OFDMA / TDD packet. It performs MAC frame variable control, 50 Mbps high-speed traffic real-time control, handover function according to scheduling, service characteristics and propagation environment.

In particular, whenever the PSS 200 performs the above-described DREG procedure or location registration, the PSS 200 determines the FA for which the DREG procedure or location registration is performed (hereinafter, referred to as “PSS FA”) to determine PSS FA information including the PSS FA. It generates and transmits the generated PSS FA information to the paging controller 240. In this case, the PSS FA information may be inserted into a location update request message requesting the location information update of the PSS 200 and transmitted to the paging controller 240.

In addition, when a paging event occurs to the PSS 200 and receives a paging request message in which the PSS FA information is inserted from the paging controller 240, the PSS FA information is extracted by extracting the PSS FA information included in the paging request message. To perform the paging procedure to the PSS 200.

ACR 220 according to a preferred embodiment of the present invention is a packet access router that accommodates a plurality of RAS (210) handover function between the RAS (210), handover function between the ACR 220, Internet access function, packet routing It performs a routing function and the like and is connected to the IP network 230. The ACR 220 mediates transmission and reception of various signals or messages, including PSS FA information and the like, between the RAS 210 and the paging controller 240.

The IP network 230 according to the preferred embodiment of the present invention connects the paging controller 230, the HA 240, the AAA 250, and the like, and delivers the packet data from an external packet data service such as the Internet 270. Receive and transmit to RAS 210.

The paging controller 240 according to a preferred embodiment of the present invention receives and updates / stores the location information and the PSS FA information of the PSS 200 from the RAS 210 and, if a paging event to the PSS 200 occurs, the PSS ( It serves to transmit the paging request message with the PSS FA information inserted to the RAS 210 which manages the zone where the PSS 200 is located with reference to the location information of the 200.

The HA 250 performs routing to connect and track the location of an external packet data server such as the Internet, and the AAA 260 charges the packet data used in the PSS 200 and accesses from the PSS 200. Authenticate

3 is a diagram illustrating a method for paging a PSS in a WiBro network according to a preferred embodiment of the present invention.

First, when the PSS performs the DREG procedure for switching from the normal execution mode to the idle mode or performs location registration (S300), the RAS determines the PSS FA on which the DREG procedure or location registration is performed (S310). Here, the location registration of the PSS is performed by inserting location information into the RNG-REQ message and transmitting the location information to the RAS as described above.

The RAS transmits the PSS FA information including the PSS FA determined in step S310 to the paging controller, and the paging controller updates and stores the received PSS FA information (S320). In more detail, when the RAS inserts the PSS FA information into a location update request message requesting the location information update of the PSS and transmits the PSS FA information to the paging controller, the paging controller transmits the PSS of the PSS included in the location update request message. A location update response message for updating and storing FA information and / or location information and informing of the location information update is transmitted to the RAS.

Thereafter, when the paging event does not occur by determining whether a paging event for calling the PSS occurs, when a situation in which the PSS is to perform location registration occurs, the process returns to step S300 again and repeats step S320 in step S300 (S330). Here, the situation in which the PSS is to perform location registration refers to a situation in which Power-Up Registration, Power-Down Registration, Paging Group Registration, Time-Based Registration, and MAC Hash Skip Threshold Registration occur as described above.

However, when the paging event occurs, the paging controller transmits the PSS FA information to the RAS with the paging request message to the RAS (S340). More specifically, when a paging event that calls the PSS occurs, the paging controller retrieves the location information of the PSS to determine the RAS that governs the area where the PSS is located, and inserts the PSS FA information into the paging request message and transmits it to the corresponding RAS. .

Upon receiving the paging request message, the RAS extracts the PSS FA information included in the paging request message and calls the PSS using the PSS FA (S350).

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, whenever the PSS performs the DREG procedure or location registration, the FA information of the PSS in which the DREG procedure or location registration is performed is continuously updated and stored, and when the paging event occurs, the stored FA is stored. The paging procedure to the PSS is performed using the FA included in the information, so that the RAS can perform the paging procedure to only a specific FA without efficiently paging the PSS to all the FAs assigned to it. It is effective to operate.

In addition, according to the present invention, since the specific FA is selected by using the DREG procedure or location registration that the PSS generally performs, it is not necessary to use a separate equipment or a complicated algorithm to select a specific FA among multiple FAs assigned to the RAS. There is.

Claims (11)

A wireless access station (RAS: Radio Access Station (RAS)) operating as a Multi Frequency Assignment (FA) in a WiBro network selects a specific FA and selects the specific FA. In the method for paging a personal subscriber station (PSS: "PSS") with the FA, (a) Whenever the PSS performs a procedure for switching from a normal operation mode to an idle mode or performs a location registration, the FA or the location registration is performed. PSS FA "); (b) PSS FA information including the PSS FA determined in step (a) as a paging controller for making a paging request to the RAS and managing location information of the PSS when a paging event to the PSS occurs. Sending a message to cause the paging controller to update and store the PSS FA information; And (c) performing a paging procedure to the PSS using the PSS FA when the paging event occurs to the PSS and receives the PSS FA information from the paging controller. Method for paging the PSS in the WiBro network comprising a. The method of claim 1, In the step (a), The location registration may be performed when the PSS is powered on, when the power is turned off, at least one of when a location registration period preset in the PSS arrives or when a paging group moves. A method for paging PSS in a WiBro network. The method of claim 1, In the step (a), And the PSS inserts the location information into a RNG-REQ message and sends the location information to the RAS to perform location registration. The method of claim 1, In step (b), (b1) inserting the PSS FA information into a location update request message requesting the location information update of the PSS and transmitting the location information to the paging controller; And (b2) a location update response indicating that the location information update is completed from the paging controller when the location information and the PSS FA information of the PSS included in the location update request message are updated and stored in the paging controller. Receiving a Message Method for paging the PSS in the WiBro network comprising a. The method of claim 1, In step (c), (c1) determining, by the paging controller, the RAS that manages the PSS when the paging event occurs to the PSS by searching for the location information of the PSS; (c2) the paging controller searches for the PSS FA information of the PSS and inserts the PSS FA information into a paging request message for requesting paging to the PSS to the RAS determined in step (c1). Transmitting; And (c3) the RAS extracting the PSS FA information included in the paging request message and performing the paging procedure to the PSS using the PSS FA Method for paging the PSS in the WiBro network comprising a. In the WiBro network, a specific FA is selected from among multiple frequency assignments (FAs), and a personal subscriber station (PSS) is designated as the specific FA. In a system for paging, Whenever the PSS performs a procedure for switching from a normal operation mode to an idle mode or performs a location registration, the FA or the location registration is performed (hereinafter, referred to as “PSS FA”). And generate and transmit PSS FA information including the PSS FA, and when a paging event occurs to the PSS and receives a paging request including the PSS FA information, the PSS FA information is used. A radio access station (RAS: Radio Access Station, hereinafter referred to as "RAS") that performs a paging procedure to the PSS; Manages the location information of the PSS and updates and stores the PSS FA information received from the RAS, and if the paging event to the PSS occurs, the RAS that manages the PSS by referring to the location information of the PSS; A paging controller for transmitting a paging request; And An access control router (ACR) for receiving packet data from an external Internet network, performing a packet routing function, and transmitting and receiving various signals and messages including the PSS FA information between the RAS and the paging controller. ACR ") System for paging the PSS in the WiBro network comprising a. The method of claim 6, The location registration performed by the PSS includes at least one of when the PSS is powered on, when the power is turned off, when a location registration period preset in the PSS arrives, or when a paging group moves. A system for paging a PSS in a WiBro network, characterized in that performed. The method of claim 6, And the PSS performs location registration by inserting location information of the PSS into a RNG-REQ message and transmitting the location information to the RAS. The method of claim 6, The RAS inserts the PSS FA information into a Location Update Request message requesting the location information update of the PSS and transmits the PSS to the paging controller. The method of claim 6, The paging controller inserts the PSS FA information into a paging request message for requesting paging when the paging event occurs to the PSS and transmits the PSS to the RAS for paging the PSS in the WiBro network. system. delete

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