KR20060039565A - Method and system for providing sdb function by using broadcast channel in wibro network - Google Patents

Abstract

The present invention relates to a method and system for implementing an SDB function using a broadcast channel of a WiBro network.

The present invention provides a method for providing an SDB function using a broadcast channel in a WiBro system including PSS, RAS, ACR, and PDSN, the method comprising the steps of: (a) receiving packet data from the PDSN; (b) selecting a specific message of the broadcast channel for transmitting the packet data; and (c) inserting the packet data into the specific message selected in step (b) and transmitting the packet data to the PSS. The method and system for implementing an SDB function using a broadcast channel of a WiBro network are provided. .

According to the present invention, a small amount of packet data is transmitted using the SDB function in the WiBro network, thereby preventing the waste of radio resources caused by reactivating the session and establishing a traffic channel.

WiBro, Mobile Internet, SDB, Broadcast Channel, MAC Management Messages

Description

Method and System for Providing SDB Function by Using Broadcast Channel in WiBro Network

1 is a block diagram showing a WiBro system for providing SDB function using a broadcast channel according to a preferred embodiment of the present invention;

2 is a flowchart illustrating a method of implementing an SDB function using a broadcast channel of a WiBro network according to an embodiment of the present invention;

3 is a diagram illustrating a format of an SLP-REQ message.

<Explanation of symbols for the main parts of the drawings>

100: PSS 110: RAS

120: ACR 130: PDSN

140: HA 150: AAA

160: IP network 170: the Internet

The present invention relates to a method and system for implementing an SDB function using a broadcast channel of a WiBro network. More specifically, upon receiving packet data from the PDSN, the broadcast channel of the WiBro network selects a specific message of a broadcast channel for transmitting the received packet data, inserts packet data into the selected specific message, and transmits the packet data to the PSS. It relates to a method and system for implementing the SDB function using.

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 established as a standard by ITU-R due to the development of information and communication. And WCDMA (WideBand CDMA) are commercially available. IMT-2000 is a mobile communication system that aims to implement various application services by combining global direct roaming including personal mobility and service mobility, same call quality as wired telephone, high speed packet data service and wired / 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 communication 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 of walking speed 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. ).

Meanwhile, the wireless Internet service provided by the mobile communication system uses packet data. In the conventional CDMA mobile communication system, DCN (Data Core Network) is used to transmit packet data, and packet control transmission (PCF) is used to transmit / receive packet data between PDSN (Packet Data Serving Node) of DCN and base station. It will be done.

If there is no data transmission or reception between the mobile terminal and the base station for a predetermined time, an RP session for communication between the PCF and the PDSN and a PPP (Point-To-Point) connection between the mobile terminal and the PDSN in order to improve the use of the wireless channel. Is maintained, and the radio link between the PCF and the base station and the base station and the mobile communication terminal is released. This state is called a Dormant state. When the packet data session is in the dormant state and wants to transmit and receive the packet data again, the packet data session may be reactivated or transmitted through a short data burst (SDB).

SDB refers to a small amount of data bursting in a doped state in which all dedicated channels between the mobile terminal and the mobile communication system are released and only common channels exist, and SDB messages are transmitted on a dedicated physical channel or a common physical channel. Can be. That is, the SDB can transmit packet data without reactivating the packet data session and performing call setup. Therefore, when a small amount of packet data is to be transmitted, the packet data can be transmitted to the SDB, thereby preventing the waste of radio resources caused by reactivating the session and establishing a traffic channel.

However, the WiBro system has not yet been proposed how to implement the same function as the above-described SDB. In addition, there is no specification that can be used to transmit the SDB message using a system message.

 In order to solve this problem, when the packet data is received from the PDSN, the present invention selects a specific message of a broadcast channel for transmitting the received packet data, inserts the packet data into the selected specific message, and transmits it to the PSS. An object of the present invention is to provide a method and system for implementing an SDB function using a broadcast channel of a network.

According to a first object of the present invention, a broadcast is provided in a WiBro system including a personal subscriber station (PSS), a radio access station (RAS), an access control router (ACR), and a packet data serving node (PDSN). A method for providing a Short Data Burst (SDB) function using a channel, the method comprising: (a) receiving packet data from the PDSN; (b) selecting a specific message of the broadcast channel for transmitting the packet data; and (c) inserting the packet data into the specific message selected in the step (b) and transmitting the packet data to the PSS.

According to a second aspect of the present invention, there is provided a system for providing an SDB function using a broadcast channel of a WiBro network, the system comprising: a PDSN for receiving packet data from an external packet data server through an IP network; An ACR accessing the IP network to receive the packet data from the PDSN and performing a packet routing function; And a RAS that receives the packet data from the ACR, selects a specific message of the broadcast channel for transmitting the packet data, inserts the packet data into the selected specific message, and transmits the packet data to the PSS. Provides a system that provides the SDB function using the WiBro network broadcast channel.

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 addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In the WiBro system, various MAC (Medium Access Control) management messages for call processing are defined. The MAC management message includes a message of a broadcast channel formed in common between the WiBro network and all subscriber stations, and a message of a traffic channel formed with a terminal in a traffic state.

Even when the terminal is in an idle state, since the broadcast channel is formed between the terminal and the WiBro network, the terminal and the WiBro network may transmit and receive broadcast channel messages. Therefore, when a small amount of packet data is to be transmitted, the packet data is inserted into a broadcast channel message and transmitted to the terminal, so that the SDB function of the existing network can be implemented in the WiBro system. That is, packet data having a size of a short message service (SMS) message can be quickly transmitted to a terminal through an SDB even in a wibro network.                     

As a broadcast channel message for implementing the SDB function, a TRF-IND message (Traffic Indication Message) or an NBR-ADV message (Neighbor Advertisement Message) may be used. Here, the TRF-IND message is a message for notifying whether there is downlink data to be transmitted to the terminal in the sleep mode to prevent power consumption of the terminal, and the NBR-ADV message is a WiBro network. This is a message transmitted from the base station of the base station to define the characteristics of the adjacent base station. Messages on the broadcast channel, including TRF-IND messages or NBR-ADV messages, use the broadcast Connection Identifier (CID) as the connection identifier.

Meanwhile, the broadcast channel message used to implement the SDB function is not limited to the above-described TRF-IND message or NBR-ADV message, and other broadcast channel messages defined in the WiBro standard may also be used to send the SDB message as needed. Can be used to transfer.

1 is a block diagram illustrating a WiBro system providing an SDB function using a broadcast channel according to a preferred embodiment of the present invention.

As shown in FIG. 1, a WiBro system that provides an SDB function using a broadcast channel according to a preferred embodiment of the present invention includes a personal subscriber station (PSS) 100, a radio access station (RAS) 110, Access Control Router (ACR) 120, Packet Data Serving Node (PDSN) 130, Home Agent (HA) 140, Authentication, Authorization, Accounting (AAA) 150, IP Network 160 and the Internet ( 170) and the like.                     

PSS (100) refers to a mobile communication terminal that can use a high-speed wireless Internet service by connecting to the WiBro system, and low power RF (RF) / IF (Intermediate Frequency) module and controller function, service characteristics and MAC frame according to the radio wave environment It has variable control function, handover function, authentication and encryption function.

The PSS 100 transmits and receives MAC management messages related to call processing with the RAS 110. In addition, the PSS 100 may receive and use packet data from the RAS 110 through a traffic channel, or may receive a broadcast channel message including the packet data and use the packet data included in the message.

PSS (100) is a terminal equipped with Multimode-Multiband (MM-MB) function that can use WiBro service as well as existing CDMA service, PDA (Personal Digital Assistant), hand-held PC, cellular phone And a mobile broadband system (MBS) phone.

The RAS 110 transmits data received from the ACR 120 to the PSS 100 wirelessly as a base station of the WiBro system, and provides a low power RF / IF module and controller function, OFDM / TDD packet scheduling and channel multiplexing function, and service. MAC frame variable control, 50 Mbps high-speed traffic real-time control, handover function, etc. according to characteristics and propagation environment.

When the RAS 110 wants to transmit the packet data received from the ACR 120 through the SDB, the RAS 110 selects a specific message of the broadcast channel, inserts the packet data into the selected specific message, and transmits the packet data to the PSS 100. Accordingly, the RAS 110 may directly transmit packet data through a broadcast channel without forming a traffic channel.

The ACR 120 is a packet access router accommodating a plurality of RASs 110 and performs a handover control function between the RASs 110 and a handover function between the ACRs 120. In addition, the ACR 120 accesses the IP network 160 to receive packet data from the PDSN 130 and performs a packet routing function.

The PDSN 130 manages sessions to service wireless data as packet data, receives packet data from an external packet data server such as the Internet 170 through the IP network 160, and delivers the packet data to the ACR 120. . In addition, the location information data of the mobile communication terminal, including the PSS 100 is managed.

The HA 140 performs routing for tracking and connecting to a location of an external packet data server such as the Internet 170, and the AAA 150 works with the PDSN 130 for packet data used by the PSS 100. To charge and authenticate the connection from the PSS 100. The IP network 160 connects the ACR 120, the PDSN 130, the HA 140, the AAA 150, and the like to provide a path for exchanging data.

2 is a flowchart illustrating a method of implementing an SDB function using a broadcast channel of a WiBro network according to a preferred embodiment of the present invention.

As shown in FIG. 2, when the PDSN 130 receives the packet data from the external packet data server through the IP 160 and transmits the packet data to the ACR 120, the ACR 120 transmits the received packet data to the RAS 110. Transfer to the (S200). The RAS 110 receiving the packet data from the ACR 120 determines whether to transmit the packet data to the PSS 100 using the SDB function (S202).

To this end, the RAS 110 checks the state of the channel formed with the PSS 100 and determines whether the size of the packet data can be transmitted through the SDB. If a traffic channel is already formed between the RAS 110 and the PSS 100, packet data may be transmitted through the traffic channel. Thus, in order to use the SDB function, a broadcast channel, which is a common channel between the RAS 110 and the PSS 100, is used. You should check that only the cast channel is established.

In addition, as described above, since the SDB function is used to quickly transmit a small amount of packet data, if the packet size transmitted through the SDB is too large, the broadcast channel may be overloaded. Therefore, it is preferable to set the maximum size of packet data that can be transmitted using the SDB function, and to set packet data having a size smaller than the maximum size to be transmitted through the SDB. Here, the maximum size may be determined by the specification between the RAS (110) and the PSS (100). For example, the maximum size may be set to about 80 bytes, which is the size of the SMS message, but is not limited thereto.

When only the broadcast channel is formed with the PSS 110 and the size of packet data is smaller than the preset maximum size, the RAS 100 may determine to transmit the packet data through the SDB. In this case, the RAS 100 selects a specific message from among broadcast channel messages to send an SDB message (S204). It is preferable that a specific message selects a broadcast channel message to be transmitted first to the PSS 100 based on a time point at which the packet data is received from the RAS 100.

If a broadcast channel message for sending an SDB message is selected, an SDB message is generated by inserting packet data in a portion where a parameter is not defined and remains in the selected message field (S206). When the SDB message is generated, the RAS 110 transmits the SDB message to the PSS 100 through a broadcast channel (S208). Here, the existing SMS message can be transmitted only to the specific PSS 100, whereas the SDB message is transmitted through the broadcast channel, so that packet data can be simultaneously transmitted in units of a plurality of PSSs 100 or specific cells.

On the other hand, if the traffic channel is formed between the PSS 100 and the RAS 110 in step S202 or the size of the packet data is larger than the preset maximum size, the RAS 110 to determine not to transmit the packet data through the SDB do. In this case, the RAS 110 transmits the packet data to the PSS 100 through the traffic channel in a conventional manner.

3 is a diagram illustrating a format of an SLP-REQ message.

An example of transmitting the packet data through the SDB by selecting the TRF-IND message among the broadcast channel messages will be described below.

The SLP-REQ message (Sleep Request Message) and the SLP-RSP message (Sleep Response) are MAC management messages related to the sleep mode of the PSS 100. The SLP-REQ message is a message transmitted from the PSS 100 to the RAS 110 to request entry into the sleep mode, and the SLP-RSP message is a RAS 110 for the sleep mode entry request of the PSS 100. ) Is the response message.

As shown in FIG. 3, the parameters defined in the SLP-REQ message are values for the operation of the sleep mode. When the PSS 100 receives the SLP-RSP message from the RAS 110, the PSS 100 checks whether there is a message received from the RAS 110 after operating in the sleep mode by the initial sleep window. If there is no received message, the window size is adjusted to twice and the device is operated in the sleep mode, and the above-described operation is repeated until the window size becomes as large as the final sleep window. During the above-described process, if the TRF-IND message is received from the RAS 110, the PSS 100 receives the packet data after the ranging process out of the sleep mode.

In this case, when the SDB function is used, the RAS 110 may insert packet data to be transmitted in the TRF-IND message and transmit the packet data to the PSS 100. Thus, even when the PSS 100 is in the sleep mode, it is possible to quickly transmit packet data through the broadcast channel.

The above description is merely illustrative of the present invention, and those skilled in the art to which the present invention pertains may various modifications without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed herein are not intended to limit the present invention but to describe the present invention, and the spirit and scope of the present invention are not limited by these embodiments. It is intended that the scope of the invention be interpreted by the following claims, and that all techniques falling within their scope shall be construed as being included in the scope of the present invention.

As described above, the present invention can implement the SDB function using the broadcast channel in the WiBro network, so that a small amount of packet data is transmitted using the SDB function to reactivate the session and set up a traffic channel. It is possible to prevent the waste of radio resources and to quickly transmit and receive packet data.

In addition, by using the SDB function in the WiBro network, packet data can be simultaneously transmitted to multiple subscribers or specific cell units.

Claims (17)

Short data using a broadcast channel in a WiBro system including a personal subscriber station (PSS), a radio access station (RAS), an access control router (ACR), and a packet data serving node (PDSN) In the method for providing a burst function, (a) receiving packet data from the PDSN; (b) selecting a specific message of the broadcast channel for transmitting the packet data; (c) inserting the packet data into the specific message selected in step (b) and transmitting the packet data to the PSS; SDB function implementation method using a broadcast channel of the WiBro network comprising a. The method of claim 1, When the RAS determines to transmit the packet data received in the step (a) using the SDB function, the RAS performs the step (b). . The method of claim 2, The RAS is configured to transmit the packet data using the SDB function when the PSS and the broadcast channel are formed but no traffic channel is formed, and the size of the packet data is smaller than a preset maximum size. A method for implementing an SDB function using a broadcast channel of a wibro network, characterized in that determining. The method of claim 3, wherein The maximum size may be determined by the specification between the RAS and the PSS SDB function implementation method using a broadcast channel of the WiBro network. The method of claim 1, In the step (b), the SDB function using the broadcast channel of the WiBro network, wherein a message of the broadcast channel to be transmitted first to the PSS is selected as the specific message based on the time point at which the packet data is received. How to implement. The method of claim 1, The specific message includes a TRF-IND message (Traffic Indication Message) and NBR-ADV message (Neighbor Advertisement Message) characterized in that the SDB function using the broadcast channel of the WiBro network. The method of claim 1, And the specific message uses a broadcast connection identifier (CID) as a connection identifier. The method of claim 1, In the step (c), the SDB message is generated by inserting the packet data in a portion of the field of the specific message selected in the step (b), in which a parameter is not defined and is left undefined. A method of implementing an SDB function using a broadcast channel of a wibro network, characterized in that the transmission to the PSS. In a system that provides a short data burst (SDB) function by using a broadcast channel of the WiBro network, A Packet Data Serving Node (PDSN) for receiving packet data from an external packet data server through an IP network; An access control router (ACR) for accessing the IP network to receive the packet data from the PDSN and performing a packet routing function; And Radio access that receives the packet data from the ACR, selects a specific message of the broadcast channel for transmitting the packet data, inserts the packet data into the selected specific message, and transmits the packet data to a personal subscriber station (PSS). Station) System for providing the SDB function using a broadcast channel of the WiBro network comprising a. The method of claim 9, When the RAS determines to transmit the packet data received from the ACR using the SDB function, the RAS selects a specific message of the broadcast channel, inserts the packet data into the selected specific message, and transmits the packet data to the PSS. A system that provides an SDB function using a broadcast channel of a WiBro network. The method of claim 10, The RAS is configured to transmit the packet data using the SDB function when the PSS and the broadcast channel are formed but no traffic channel is formed, and the size of the packet data is smaller than a preset maximum size. A system for providing an SDB function using a broadcast channel of a wibro network, characterized in that determining. The method of claim 11, The maximum size is a system for providing an SDB function using a broadcast channel of the WiBro network, characterized in that can be determined by the specification between the RAS and the PSS. The method of claim 9, The RAS provides an SDB function using a broadcast channel of a WiBro network, wherein the RAS selects a message of the broadcast channel to be transmitted first to the PSS based on a time point at which the packet data is received. System. The method of claim 9, The specific message includes a TRF-IND message (Traffic Indication Message) and NBR-ADV message (Neighbor Advertisement Message), the system for providing the SDB function using the broadcast channel of the WiBro network. The method of claim 9, And the specific message uses a broadcast connection identifier (CID) as a connection identifier. The method of claim 9, The RAS generates an SDB message in which the packet data is inserted into a portion of the field of the specific message in which a parameter is not defined and transmits the SDB message to the PSS. A system that provides the SDB function by using the broadcast channel of the system. The method of claim 9, The PSS is a terminal equipped with a multimode-multiband (MM-MB) function that can use WiBro service as well as a conventional mobile communication service. A personal digital assistant (PDA), a hand-held PC, a cellular phone, A system for providing an SDB function using a broadcast channel of a WiBro network, including a MBS (Mobile Broadband System) phone.

Images