KR20100004520A - System and method for session deregistration of idle mode terminal - Google Patents

Abstract

PURPOSE: A system and a method for releasing a session of an idle mode terminal are provided to simplify a session release procedure of an idle mode terminal, thereby increasing efficiency about using system resources and wireless channels for message transmission/reception. CONSTITUTION: If a session of an idle mode terminal is released, an ASN-GW(Access Service Node-Gateway) sets the first idle session releasing indicating value to a paging value of the first paging message(501). Session information of the idle mode terminal is deleted. A base station sets the second idle session releasing indicating value to an action code value of the second paging message(504).

Description

Session release system of idle mode terminal and method thereof {SYSTEM AND METHOD FOR SESSION DEREGISTRATION OF IDLE MODE TERMINAL}

The present invention relates to a session release system and a method of the idle mode terminal, and in particular, by controlling the session release of the idle mode terminal in the Mobile WiMax system, the session release, which can increase the efficiency for using the radio channel resources A system and method thereof are provided.

Mobile Interoperability for Microwave Access (WiMax) technology aims to improve the coverage and speed of Wi-Fi, the existing wireless Internet technology. It started with Fixed WiMax. After that, Mobile WiMax was born with the addition of mobile capabilities. Wibro (Wireless Broadband Internet) and Mobile WiMax, which we call the mobile Internet, are conceptually the same technology, and are technologies that allow users to continue using the Internet while carrying and moving handsets.

The session release procedure of the dormant terminal in the mobile WiMAX system is performed according to the IEEE 802.16e-2005 standard and the NWG-R1.1.2-Stage 3 standard of the WiMax Forum.

The idle state of a terminal is a state in which the wireless link is released from the terminal or the network when the wireless link of the terminal in service is released for abnormal reasons or there is no data to be transmitted / received by the terminal. By storing information, authentication information, etc. for a certain time, it is a function to quickly perform a network re-entry (Network Re-Entry) procedure of the terminal that occurs after.

Referring to Figure 1, looking at the session release procedure of the idle mode terminal in the mobile WiMAX system according to the prior art.

An initial network entry process 101 is performed from the terminal MS [active state; A path for data transmission is connected between the terminal and the system so that it can be serviced. Here, as an example of the initial network entry process 101, ranging, ranging (SS Basic Capability), terminal authentication and key exchange, registration, connection settings, IP address assignment and the like. However, this network entry process 101 is not directly related to the present invention, and detailed procedures are defined in the IEEE 802.16e-2005 standard and the NWG-R1.1.2-Stage 3 standard content of the WiMax Forum.

In the terminal MS, network entry processes 102 to 106 of an idle mode terminal are performed. That is, the terminal MS determines to enter the idle mode and transmits a release request (DREG_REQ) message of the IEEE 802.16e to the base station BS (102). Based on the request of the terminal MS, the base station BS sends an idle mode entry state change request (IM_Entry_State_Change_Req) message to the access service node gateway (ASN-GW) (103), and responds to it from the ASN-GW. Receives a message IM_Entry_State_Change_Rsp (104), transmits a response message (DREG_RSP) for the DREG_REQ message to the MS (105), and sends a confirmation message (IM_Entry_State_Change_Ack) for the IM_Entry_State_Change_Rsp message to the ASN-GW. (106).

As a result, an idle session in a state in which the radio link is released from the MS or the network is set (idle state; Service is not available because the passage for data transmission is not connected between the terminal and the system, but the system stores the idle session data (paging information) for the terminal, so that the service can be performed at any time through paging] (107). For example, the ASN-GW performs a release procedure for an idle session of an idle mode terminal (eg, a session release function by an operator command) 108. In the ASN-GW, when a release operation for a session of a dormant mode UE is started, a Paging Announce message is first transmitted to the BS (step 109). Accordingly, the BS receives a MOB_PAG-ADV message (base station). Broadcast paging message) is transmitted to the terminal (MS) (110).

The MS performs a network re-entry process (111 to 116) for paging to connect the data paths, and performs a network exit process (117 to 121) to release the data path. Thus, the session release procedure of the idle mode terminal is terminated.

In the network reentry processes 111 to 116, the MS transmits a burst profile, media access control (MAC) information of the MS, and the like through a ranging request (RNG-REQ) message. BS 111, and the base station BS responds with a ranging response (RNG-RSP: Ranging Response) message (116). In this case, the RNG-RSP message includes information such as ranging status, burst profile, MAC address of the MS, and connection identifier (CID). However, in the network re-entry process (111 ~ 116), the base station (BS) according to the ranging request (111) transmits the idle mode end state change request (IM_Exit_State_Change_Req) message to the ASN-GW (112), the response message ( IM_Exit_State_Change_Rsp) is received from the ASN-GW (113), sends and receives a path registration request / response (Path_Reg_Req / Path_Reg_Rap) message with the ASN-GW, connects the data path (114, 115), and responds to the MS (ranging). 116).

In addition, the terminal MS releases the connected data path through the exchange of a path de-registration message (Path_Dereg_Req / Path_Dereg_Rsp / Path_Dereg_Ack) [Network Exit] (117 to 121). That is, the ASN-GW transmits a path release request (Path_Dereg_Req) message to the base station BS (117), whereby the base station BS includes an action code "0x00" indicating network termination of the terminal MS. Sending a release command (DREG_CMD) message to the terminal (118), and receives a release request (DREG_REQ) message including the action code "0x02" in response to the terminal (MS) (119), the Path_Dereg_Req A response message (Path_Dereg_RSP) to the message is transmitted to the ASN-GW (120), and a confirmation message (Path_Dereg_Ack) is received from the ASN_GW (121).

As described above, the idle session release procedure of the conventional idle mode terminal includes a paging process (109, 110), a network re-entry process (111 to 116) according to a paging response, and a network termination process (117 to 121).

However, in the session release procedure of the conventional idle mode terminal, when the paging fails or the network re-entry failed, a session mismatch between the terminal MS and the ASN-GW may occur. That is, in the ASN-GW, the session information is deleted by deleting the session information of the idle mode terminal, but the terminal continues to idle when the terminal does not receive a paging message or fails in network re-entry. Session state, and the subsequent network re-entry process cannot be performed properly due to inconsistent session state with each other. Therefore, an initialization process such as power cycle of the terminal MS is required.

In addition, in the session release procedure of the conventional idle terminal, there is a problem that an unnecessary data path is connected (Path_Reg) to the session to be deleted and then released again (Path_Dereg). That is, the data path is connected by a path registration request / response (Path_Reg_Req / Path_Reg_Rap) message during network re-entry in response to paging, and then a path release request to perform a network exit. Performs the procedure to release the data path by the message / Response / Confirm (Path_Dereg_Req / Path_Dereg_Rsp / Pagh_Dereg_Ack). Therefore, performing such a complicated procedure on the released session causes radio channel resource waste due to message exchange on the radio and signaling performance degradation due to signaling message load due to message exchange between the BS and the ASN-GW. Done.

Disclosure of Invention It is an object of the present invention to provide a session release system and method, which can increase the efficiency of using radio channel resources by controlling session release of a dormant mode terminal, particularly in a mobile WiMax system.

According to an aspect of the present invention, a method for controlling session release of a dormant mode terminal is disclosed, in particular in a mobile WiMax system.

According to an embodiment of the present invention, when the session is released from the idle mode terminal, the access service node gateway (ASN-GW) sets and transmits a first idle session release indication value to a paging cause value of the first paging message and pauses. Delete the session information of the mode terminal. The base station sets and broadcasts the second idle session release indication value to the action code value of the second paging message based on the paging cause value of the first paging message. Then, the terminal releases the previously stored idle session information according to the action code value of the second paging message received from the base station.

According to another embodiment of the present invention, when the session is released from the idle mode terminal, the access service node gateway (ASN-GW) sets and transmits a first idle session release indication value to a paging cause value of the first paging message, and transmits the base station. A second idle session release indication value is set to the action code value of the second paging message based on the paging cause value of the first paging message and broadcasted. The base station receives the response message for the second paging message from the terminal and transmits the idle session release completion message to the ASN-GW, and when the ASN-GW receives the idle session release completion message, the base station receives the session of the idle mode terminal. Release it. Then, the terminal checks the action code value of the second paging message received from the base station, and if the action code value is the second idle session release indication value to set the idle session release completion value in the paging response message to the base station, Releases previously stored idle session information.

According to another aspect of the present invention, a system for controlling session release of a dormant mode terminal is disclosed, particularly in a Mobile WiMax system.

According to an embodiment of the present invention, when a session is released from the idle mode terminal, the first idle session release indication value is set to the paging cause value of the first paging message and transmitted, and the session information of the idle mode terminal is operated to be deleted. Providing a base station operable to broadcast by setting a second idle session release indication value to an action code value of a second paging message based on the access service node gateway (ASN-GW) and a paging cause value of the first paging message; do. The terminal may further provide a terminal for releasing previously stored idle session information according to an action code value of a second paging message received from a base station.

According to another embodiment of the present invention, when the session is released from the idle mode terminal, the first idle session release indication value is set to the paging cause value of the first paging message and transmitted to the base station, and the idle session release complete message is received from the base station. According to the paging cause value of the first paging message and the access service node gateway (ASN-GW) operative to release the session of the idle mode terminal according to the action code value of the second paging message. It provides a base station that operates by setting a value and broadcasting, receiving a response message to the second paging message from the terminal, and sending a dormant session release completion message to the ASN-GW. In addition, by checking the action code value of the second paging message received from the base station, if the action code value is the second idle session release indication value, the idle session release completion value is set in the paging response message and transmitted to the base station, and stored Further provided is a terminal operative to release idle session information.

According to the present invention, in particular, by simplifying the session release procedure of the idle mode terminal in the mobile WiMAX system, there is an advantage to increase the efficiency of the use of radio channels and system resources for message transmission / reception.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the following description, when there is a risk of unnecessarily obscuring the gist of the present invention, a detailed description of well-known functions and configurations will be omitted.

2 is a diagram schematically illustrating a configuration of a mobile WiMAX system to which the present invention is applied.

Mobile station (MS) 10 is a subscriber device for mobile WiMAX service and provides a wireless data service to a subscriber. The functions include Internet wireless access function, IP based service access function, IP mobility function, device / user authentication and supplementary function, multicast service reception function, and the like.

The base station (BS) 20 is an Internet wireless access function, radio resource management and control function, mobility (handoff) support function, authentication and security function, QoS provision function, downlink multicast function, billing Provide statistics generation and notification function. The base station 20 provides the IEEE 802.16e-2005 Physical Layer and MAC Layer processing functions for the Mobile WiMAX service.

The access service node gateway (ASN-GW) 30 is an edge router for mobile WiMAX service, and includes mobility, authentication, data transmission / reception functions, and CSNs 40 for the terminal 10. Provides a connection function. Its functions include IP routing and mobility management, authentication and security, QoS provisioning, IP multicast, billing server provisioning, ASN-GW handover, resource management and control. do.

Connectivity service node (CSN) 40 is a mobile WiMAX external network, and CSN 40 includes an authentication / authorization / accounting (AAA) server and a home agent (HA). Functions include an IP address assignment function, authentication and billing function, IP mobility support function, IMS interworking function, Internet access service function, and the like, and are connected to a mobile communication core network (public IP network) 50 through a router.

In the mobile WiMAX network having such a configuration, the present invention simplifies the session release procedure of the idle mode terminal 10. That is, the present invention is to improve the release procedure for the session (Idle Session) of the idle mode terminal 10, by instructing to delete the session information of the terminal 10 when performing the paging process, so that the subsequent procedure (that is, conventional In the session release procedure of the idle mode terminal, the idle session release operation is normally performed even if the terminal does not perform the network reentry process or the network termination process.

Here, the command for instructing to delete the session information of the terminal 10 when performing the paging process, a paging announcement message transmitted from the ASN-GW 30 to the base station 20 [NWG-R1.1.2- Stage 3] and the parameters of the broadcast paging message (MOB_PAG-ADV message; MAC layer message for terminal paging) transmitted from the base station 20 to the terminal 10 [IEEE 802.16e-2005] On board.

For example, in the present invention, a value for indicating the release of the session of the idle mode terminal 10 ['Deleting idle session (= 0x03)'] is included in the Paging Cause value included in the paging announcement message. ] Is set.

name Length value Paging cause 1 Byte 0x01 = Location update 0x02 = Network Re-entry, Incoming Data for Idle MS 0x03 = Deleting idle session Other values are reserved

In addition, in the present invention, the value indicating the release of the session of the idle mode terminal to the action code value included in the broadcast paging message (MOB_PAG-ADV message) of the base station 20 ['Deleting idle session (= 0b11) '] Is set as shown in [Table 2] below.

name Length value Action code 2 Bits Paging action instruction to MS 0b00 = No Action Required 0b01 = Perform Ranging to establish location and acknowledge message 0b10 = Enter Network 0b11 = Deleting idle session0x01 = Location update

In this way, the present invention can be realized by setting a value indicating the release of the idle session in the paging announcement and the MOB_PAG-ADV message. The process of releasing idle sessions (sessions of idle mode terminals) in the ASN-GW 30 and the terminal 10 according to the present invention will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, when the release operation for the session of the idle mode terminal 10 starts (301), the ASN-GW 30 generates a paging announcement message. At this time, a value for instructing a session release of the idle mode terminal 10 (that is, an idle session release indication value) ['Deleting idle session (= 0x03)'] is set to a paging cause value included in the paging broadcast message (302). ).

And, the ASN-GW 30 is a paging announcement in which a value indicating the release of the session of the idle mode terminal 10 (ie, idle session release indication value) ['Deleting idle session (= 0x03)'] is added. Message) is transmitted to the base station 20 (303), and the session information of the idle mode terminal 10 is deleted (304).

Although not shown, when the base station 20 receives a paging announcement message from the ASN-GW 30, the base station 20 examines the paging cause value of the paging announcement message, and the paging cause value is set to the idle session. If the release indication value ['Deleting idle session (= 0x03)'], set the idle session release indication value ['Deleting idle session (= 0b11)'] to the action code value of the MOB_PAG-ADV message. Broadcast over the air.

Thereafter, when the terminal 10 receives a paging message (MOB_PAG-ADV) for itself as shown in FIG. 4 (401), the terminal 10 checks an action code value of the received paging message (402).

As a result of the check, when the Action Code value of the paging message (MOB_PAG-ADV) is the idle session release indication value ['Deleting idle session (= 0b11)'], the terminal 10 stores the idle session (Idle) stored therein. Session) information is deleted (403), and other values are performed according to the corresponding action code (404).

Referring to FIG. 5, the release operation for the idle session of the idle mode terminal 10 starts in the ASN-GW 30 in the state where the idle session is set (501). In step 502, the ASN-GW 30 sets the idle session release indication value ['Deleting idle session (= 0x03)'] in the Paging Cause value to transmit a paging announcement message to the base station 20. In operation 503, session information of the idle mode terminal 10 is deleted (505).

When the base station 20 receives the paging announcement message from the ASN-GW 30 (503), the base station 20 checks the paging cause value of the paging announcement message, and the paging cause value is the idle session release indication value. In case of ['Deleting idle session (= 0x03)'], set the idle session release indication value ['Deleting idle session (= 0b11)'] in the Action Code value of MOB_PAG-ADV message to broadcast over the air. Cast (504).

When the terminal 10 receives a paging message (MOB_PAG-ADV) for itself (504), it checks the action code value of the received paging message, the action code value of the paging message (MOB_PAG-ADV) is In the case of the idle session release instruction value ['Deleting idle session (= 0b11)'], the idle session information previously stored is deleted (506).

By performing the session release procedure of the idle mode terminal 10 as described above, it is not necessary to perform the network re-entry process and the network termination process as compared to the existing idle session (session of the idle mode terminal) release procedure (see FIG. 1).

It is possible to add a paging response process as shown in FIG. 6 in the idle session release procedure by the paging message (Paging Announce message, MOB_PAG-ADV message) presented above. In FIG. 6, steps "601" to "604" apply the steps "501" to "504" of FIG. 5 above.

In response to the paging response for the value indicating the session release of the idle mode terminal 10 (that is, the idle session release indication value), the terminal 10 displays the idle mode terminal in a code of a DREG-REQ (IEEE 802.16e-2005) message. A value (ie, idle session release completion value) ['idle session deleted'] indicating that the session information is deleted (10) is set and transmitted to the base station 20 (605), and the idle session information is deleted. (607). On the other hand, the base station 20 indicates a value indicating that the session information of the idle mode terminal 10 is deleted from the network exit indicator parameter value of the NetExit MS State Change Req message. Set the idle session release value) ['idle session deleted'] and transmit it to the ASN-GW 30 (606), and when the ASN-GW 30 receives it, the session information of the idle mode terminal 10 is received. Delete (608).

In the above embodiment, the idle session release command is executed, but the idle session release procedure of the present invention is applied even when the session is released in all abnormal cases that may occur in the terminal idle state such as authentication timer expiration during the idle state. Note that you can.

Although the methods have been described through specific embodiments, the methods may also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which are also implemented in the form of carrier waves (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the above embodiments can be easily inferred by programmers in the art to which the present invention belongs.

In addition, while the present invention has been described in connection with some embodiments, it is to be understood that various modifications and changes can be made without departing from the spirit and scope of the invention as will be understood by those skilled in the art. You will need to know Also, such modifications and variations are intended to fall within the scope of the claims appended hereto.

1 is a flowchart illustrating a session release procedure of an idle mode terminal in a mobile WiMAX system according to the related art.

2 is a view schematically showing the configuration of a mobile WiMAX system to which the present invention is applied.

3 is a flowchart illustrating a session release process of an idle mode terminal in ASN-GW according to an embodiment of the present invention.

4 is a flowchart illustrating a session releasing procedure of an idle mode terminal in a terminal according to an embodiment of the present invention.

5 is a flowchart illustrating a session release procedure of an idle mode terminal according to an embodiment of the present invention.

6 is a flowchart illustrating a session release procedure of an idle mode terminal according to another embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10: mobile terminal (MS) 20: base station (BS)

30: access service node gateway (ASN-GW) 40: connection network (CSN)

50: public IP network

Claims (13)

A session release method of an idle mode terminal in a mobile communication system, When the session is released from the idle mode terminal, an access service node gateway (ASN-GW) sets and transmits a first idle session release indication value to a paging cause value of a first paging message, and deletes session information of the idle mode terminal. Making; And A base station setting and broadcasting a second idle session release indication value to an action code value of a second paging message based on a paging cause value of the first paging message; Session release method of the idle mode terminal comprising a. The method of claim 1, Releasing, by the idle mode terminal, previously stored idle session information according to an action code value of the second paging message received from the base station; Session release method of the idle mode terminal further comprising. A session release method of an idle mode terminal in a mobile communication system, When the session is released from the idle mode terminal, an access service node gateway (ASN-GW) setting and transmitting a first idle session release indication value to a paging cause value of a first paging message; Broadcasting, by a base station, setting a second idle session release indication value to an action code value of a second paging message based on a paging cause value of the first paging message; Receiving, by the base station, a response message for the second paging message from the idle mode terminal, and transmitting a idle session release completion message to the ASN-GW; And Releasing the session of the idle mode terminal when the ASN-GW receives the idle session release completion message; Session release method of the idle mode terminal comprising a. The method of claim 3, The idle mode terminal checks the action code value of the second paging message received from the base station, and if the action code value is the second idle session release indication value, sets the idle session release complete value in the response message. Transmitting to the base station and releasing previously stored idle session information Session release method of the idle mode terminal further comprising. The method according to any one of claims 1 to 4, The first paging message is a paging announcement message between the ASN-GW and the base station for terminal paging, The second paging message is a message of the MAC layer for terminal paging, MOB_PAG-ADV message broadcast from the base station, the session release method of the idle mode terminal. The method of claim 5, The first idle session release indication value is 'Deleting idle session (= 0x03)', The second idle session release indication value is 'Deleting idle session (= 0b11)', the session release method of the idle mode terminal. The method according to claim 3 or 4, The response message is a DREG-REQ message, The idle session release completion message is a NetExit MS State Change Req message. A session release system of an idle mode terminal, When the session is released from the idle mode terminal, an access service node gateway (ASN-) configured to transmit a first idle session release indication value to a paging cause value of a first paging message and to delete session information of the idle mode terminal. GW); And And a base station operable to broadcast by setting a second idle session release indication value to an action code value of a second paging message based on a paging cause value of the first paging message. The method of claim 8, The idle mode terminal releasing previously stored idle session information according to an action code value of the second paging message received from the base station; Session release system of the idle mode terminal further comprising. A session release system of an idle mode terminal, When the session is released from the idle mode terminal, a first idle session release indication value is set to a paging cause value of the first paging message and transmitted to the base station, and the idle session release complete message is received from the base station. An access service node gateway (ASN-GW) operative to release a session; And Based on the paging cause value of the first paging message, broadcast by setting a second idle session release indication value to the action code value of the second paging message, the response message for the second paging message to the idle mode terminal A base station operative to receive from the ASN-GW and receive the idle session release complete message. Session release system of the idle mode terminal comprising a. The method of claim 10, Inspecting an action code value of the second paging message received from the base station, and setting an idle session release completion value in the response message when the action code value is the second idle session release indication value; The idle mode terminal operable to release previously stored idle session information Session release system of the idle mode terminal further comprising. The method according to any one of claims 8 to 11, The first paging message is a paging announcement message between the ASN-GW and the base station for terminal paging, The second paging message is a message of the MAC layer for terminal paging is a MOB_PAG-ADV message broadcast from the base station, The first idle session release indication value is 'Deleting idle session (= 0x03)', The second idle session release indication value is 'Deleting idle session (= 0b11)', the session release system of the idle mode terminal. A computer readable storage medium storing computer executable instructions for performing the method of any one of claims 8-11.

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