KR20060043540A - Idle mode control method of mss in broadband wireless access system - Google Patents

Abstract

The present invention relates to a method of exiting an idle mode of a mobile subscriber station in a broadband wireless access system. In the broadband wireless access system according to the present invention, the method for terminating an idle mode of a terminal may include moving a terminal in an idle mode within a first paging zone to another paging area (second paging area). In the idle mode termination method in the first paging area, the base station (current base station) to which the terminal currently belongs (base station) to allow the terminal to switch to the idle mode in the first paging area from the terminal (first A first step of receiving an identifier (base station ID) of a base station; A second step of the current base station notifying the first base station that the terminal has moved to the second paging area; A third step of the first base station notifying the base stations belonging to the first paging area to remove the terminal from the paging list; And a fourth step in which the base stations belonging to the first paging area remove the terminal from the paging list.

Broadband Wireless Access, Idle Mode, Paging Area, Terminal, Base Station, Paging Controller

Description

Idle Mode Control Method of MSS in Broadband Wireless Access System

1 is a diagram illustrating an embodiment for describing a procedure for terminating an idle mode when there is downlink traffic in the prior art.

Figure 2 is an embodiment explanatory diagram for explaining a preferred embodiment of the present invention.

3 is a diagram illustrating an embodiment of a paging group.

4 is a diagram illustrating an embodiment of a broadband wireless access system having a paging controller.

5 is a flowchart illustrating a procedure for managing base stations belonging to a paging group in a broadband wireless access system equipped with a paging controller.

FIG. 6 is a flowchart of a first embodiment showing a method for controlling an idle mode in a broadband wireless access system equipped with a paging controller. FIG.

FIG. 7 is a flowchart of a second embodiment showing an idle mode control method in a broadband wireless access system equipped with a paging controller. FIG.

FIG. 8 is a flowchart of a third embodiment showing a method for controlling idle mode in a broadband wireless access system equipped with a paging controller. FIG.

9 is a flowchart of a fourth embodiment showing a method of controlling an idle mode in a broadband wireless access system equipped with a paging controller.

The present invention relates to a method of exiting an idle mode of a mobile subscriber station in a broadband wireless access system. More specifically, when the mobile terminal needs to exit the idle mode in the first paging area by moving from one paging area to another paging area, unnecessary paging in the previous paging area by notifying the base station allowing the initial idle mode. The present invention relates to an idle mode termination method and an idle mode control method using a paging controller.

The broadband wireless access system supports idle mode in order to minimize power consumption of a mobile subscriber station (MSS). During the idle mode, the mobile terminal does not need to perform a handoff procedure when moving between base stations included in the same paging zone. Therefore, since the mobile terminal does not need to transmit uplink information for the handover procedure, power consumption can be reduced.

The paging area is defined as an entire area that is handled by a plurality of base stations, called paging groups. Base stations included in the same paging area have the same value of paging period (Paging_Cycle) and paging offset (Paging_Offset).

The terminal may request the base station to switch to the idle mode, and the base station may switch to the idle mode state by transmitting its paging-group ID, the paging period and the paging offset accordingly.

During the idle mode, the terminal can determine whether to continue or remain in the idle mode through paging delivered in the form of a broadcast from the base station at each paging period promised.

When traffic to be transmitted by the terminal in the idle mode occurs, the terminal may exit the idle mode at any time. When traffic to be delivered to the terminal in the idle mode occurs, the base station may cause the terminal to terminate the idle mode through paging. In addition, when the terminal in the idle mode does not receive the paging at a predetermined time due to moving to another paging area or losing synchronization, the terminal terminates the idle mode.

In conclusion, as long as there is no information to be transmitted or received, the UE entering the idle mode can be freely moved in the same paging area without performing a handover procedure by normally receiving periodic paging.

In order to configure one paging area, a backbone message (paging-group-action) of a type shown in Table 1 transmitted over a wire between base stations is used.

Field Size Notes Message Type 8 bit Sender BS ID 48 bit Base station unique identifier (Same number as that broadcasted on the DL-MAP message) Target BS ID 48 bit Base station unique identifier (Same number as that broadcasted on the DL-MAP message) Time stamp 32 bit Number of miliseconds since midnight GMT (see to 0xTTTTTTTT to ignore) Action 4 bit 0-Assign target BS to paging groups 1-Remove targe BS from paging groups 2-Query (which paging groups target BS belongs to?) 3-Information (paging groups sender BS belongs to) Num records 4 bit Number of paging-group-ID records For (j = 0; j <Num Records; j ++) { Paging-group-ID 16 bit Paging group ID PAGING_CYCLE 16 bit Cycle in which the paging message is transmitted within the paging group PAGING OFFSET 8 bit MSS PAGING OFFSET parameter  } Security field TBD A means to authenticate this message CRC field 32 bit IEEE CRC-32

The backbone message is transferred between base stations. The backbone message may be used for the following four purposes depending on the content of the action field.

A target BS may be designated as a specific paging group (Action = 0). The receiving base station may be excluded from the specific paging group (Action = 1). It may ask which paging group the receiving base station belongs to (Action = 2). The transmitting base station (Sender BS) may indicate to which paging group (Action = 3).

Since one base station may belong to more than one paging area, the backbone message may include information about a plurality of paging groups. The backbone message allows the base stations to know the paging period and paging offset used in each paging area. The backbone message makes it possible to dynamically allocate base stations to paging groups.

In order for the mobile station to switch to idle mode, idle DREG_REQ, which is one of the existing MAC messages, is used as the idle mode request message. The idle mode request message DERG_REQ has the format shown in Table 2 below.

The mobile terminal can request that it switch to idle mode by setting the De-registration Request Code of the DERG_REQ message to 0x01 and transmitting it to the base station. (It is also possible to pass the desired paging cycle at this time.)

The base station receiving the DERG_REQ message may respond to the request of the terminal through the existing DREG_CMD message. The format of the DREG_CMD message is shown in Table 3 below.

The base station allows the transition to the idle mode through the action code (Action Code) of the DREG_CMD message (Action Code = 0x05), or request to switch back to the idle mode after a certain time (Action Code = 0x06), or Until this DREG_CMD is transmitted, it can be no longer requested to switch to idle mode (Action Code = 0x07).

Details of the action code of the DREG_CMD message are described in Table 4 below.

Base stations belonging to the same paging area should be able to share information about mobile terminals that have switched to idle mode, and thus should be able to inform the mobile terminal of the procedure for each paging period.

For this purpose, the paging announcement backbone message shown in Table 5 is used.

The paging announcement backbone message should be delivered to all base stations belonging to the same paging area. The base station receiving the paging announcement backbone message should page the MAC addresses of the terminals included in the message according to the paging period and paging offset in the message.

As a result, through the paging announcement backbone message, all the base stations belonging to a certain paging area can keep the MAC addresses of the terminals to be paged the same, so that some terminals have their own every paging cycle unless they leave the current paging area. It is possible to receive paging information for.

The format of a paging message (MOB-PAG_ADV) that each base station transmits through paging to terminals in idle mode is shown in Table 6 below. The paging message is delivered to the terminals in the form of a broadcast.

Receiving the paging message, the terminal, whether through the 2-bit action code (Action Code) can continue to maintain the idle mode (Action Code = 00), whether the ranging (ranging) to update the location information? (Action Code = 01), it is possible to determine whether to exit the idle mode in order to receive the downlink traffic to be delivered to it (Action Code = 10).

When the terminal has generated traffic to be transmitted (uplink traffic), when the terminal has to receive traffic (downlink traffic), the terminal receives periodic paging due to a departure from the current paging area or a problem in the transmission process. If not, you must exit idle mode.

When downlink traffic to be delivered to the terminal in the idle mode occurs, a procedure for terminating the idle mode will be described with reference to FIG. 1.

Since the base stations do not know which base station the terminal is in the idle mode, the downlink traffic is unconditionally forwarded to the base station (first base station) that the terminal first requested to switch to the idle mode.

When downlink traffic is received to a terminal that allows the user to switch to idle mode, the first base station (first base station) acts on all base stations in the paging area to which it belongs. Set the code to 11 to transmit the paging announcement backbone message [S11].

All base stations receiving the paging announcement message transmit the broadcast code by setting the action code of the paging message (MOV_PAG_ADV) to 10 to all mobile terminals in its own area [S12].

The terminal receiving the paging message ends the idle mode and requests a second base station (current base station) that is in charge of the current area to re-register with the network [S13]. The second base station can know the base station ID of the first base station through the paging guide message.

Upon receiving the re-registration request, the second base station notifies that the mobile station to be found by the first base station is located in its own area by transmitting an action flag of the MSS_Info_Request backbone message transmitted by wire between base stations. [S14].

 An example of the MSS_Info_Request backbone message is shown in Table 7.

Receiving the MSS_Info_Request, the first base station informs all base stations in the same paging area to delete the terminal from the paging list through the paging guide backbone message.

The above-described procedure describes a procedure for terminating idle mode when the terminal needs to receive downlink traffic when it moves between base stations in the same paging area. However, when the terminal moves out of the conventional paging area and moves to another paging area, a procedure for terminating the idle mode in the conventional paging area is not clearly defined.

In addition, when a paging controller exists, there is a problem in that a method for more efficiently controlling the idle mode is not provided.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is when the mobile terminal needs to terminate the idle mode in the first paging area by moving from one paging area to another paging area. In addition, the present invention provides an idle mode control method capable of preventing unnecessary paging in a previous paging area by notifying the base station allowing the first idle mode.

Another object of the present invention is to provide a method for more efficiently controlling an idle mode using a paging controller when the terminal moves from one paging area to another paging area.

In the broadband wireless access system according to the present invention, the method for terminating an idle mode of a terminal may include moving a terminal in an idle mode within a first paging zone to another paging area (second paging area). In the idle mode termination method in the first paging area, the base station (current base station) to which the terminal currently belongs (base station) to allow the terminal to switch to the idle mode in the first paging area from the terminal (first A first step of receiving an identifier (base station ID) of a base station; A second step of the current base station notifying the first base station that the terminal has moved to the second paging area; A third step of the first base station notifying the base stations belonging to the first paging area to remove the terminal from the paging list; And a fourth step in which the base stations belonging to the first paging area remove the terminal from the paging list.

In the detailed description of the invention, reference may be made to the IEEE802 document, which is a standard for broadband wireless access systems.

Hereinafter, a preferred embodiment of the idle mode termination method of a terminal in a broadband wireless access system according to the present invention will be described with reference to the accompanying drawings. 2 is a view for explaining a preferred embodiment of the present invention.

In FIG. 2, a procedure for terminating the idle mode of the terminal in the first paging area when the terminal in the idle mode within the first paging area moves to the second paging area is disclosed.

Since each paging area uses different paging periods and paging offsets, periodic paging cannot be received when a terminal in an idle mode within the first paging area moves to the second paging area. The first base station is a base station (first base station) that allows the terminal to switch to idle mode within the first paging area.

Accordingly, the terminal terminates the idle mode and requests the second base station in the second paging area to re-register with the network [S21]. Since the second base station cannot know the base station ID of the first base station, the terminal should inform the base station ID of the first base station in the process of requesting re-registration to the network.

In order to inform the base station ID of the first base station to the second base station, it is preferable to configure a ranging request message (RNG_REQ) for a network re-registration request as shown in Table 8 below.

Name Type (1 byte) Length Value (Variable-length) Serving BS ID 4 6 The unique identifier of the former Serving BS Basic CID 6 2 Basic CID allocated from the former Serving BS Initiating BS ID TBD 6 The unique identifier of the former BS allowing an MSS to enter idle mode

The second base station receiving the re-registration request from the terminal sets the action flag of the MSS-Info-Request backbone message to 2 (ie, indicating that the terminal has moved to another paging area-see Table 7). To [S22]. Since the second base station has received the base station ID ('Initiating BS ID' in Table 8) of the first base station from the terminal, it can transmit the MSS_Info_Request backbone message to the first base station.

Upon receiving the MSS_Info_Request, the first base station notifies all base stations in the same paging area, that is, the first page area, from the paging list to be deleted from the paging list through a paging guide backbone message. All base stations within the first page area receiving the notification terminate the idle mode for the terminal by deleting the terminal from the paging list.

3 is a diagram illustrating an embodiment of a paging group. As shown in FIG. 3, at least one base station may form a paging group. Base stations belonging to the same paging group transmit and receive information necessary to provide an idle mode through a backbone message. Meanwhile, information required for providing an idle mode may be transmitted and received between base stations belonging to different paging groups through a backbone message.

4 is a diagram illustrating an embodiment of a broadband wireless access system having a paging controller. Referring to FIG. 4, the paging controller transmits and receives information necessary for idle mode support with base stations belonging to at least one paging group, thereby performing idle mode control for a terminal in each base station region through the base station. That is, transmission and reception of information necessary for providing an idle mode may be performed between the base stations through the paging controller. The paging controller may be provided in a specific base station or may be provided separately from the base station.

5 is a flowchart illustrating a procedure for managing base stations belonging to a paging group in a broadband wireless access system equipped with a paging controller. As shown in FIG. 5, the paging controller may control base stations belonging to each paging group using a backbone message. For example, using an action code of a paging-group-action request backbone message, assign a paging group to the base station (Action Code = 0000), or remove it from a particular paging group (Action Code = 0001). ), It may request paging information of the corresponding base station (Action Code = 0010) or may inform paging information of another base station (Action Code = 0011) (S51). Table 9 shows an example of a paging group operation request message.

Field Size Notes Message Type = 8 bits Sender ID 48 bits Identifier of Paging Controller or BS sending this message Receiver ID 48 bits Identifier of Base Station receiving this message Time stamp 32 bits Action code 4 bits 0000: Assign Target BS to paging groups 0001: Remove Target BS from paging groups 0010: Query (Paging Information of Receiver BS) 0011: Information (Paging Information of Queried BS) 0100 1111: reserved If (Action Code == 0000 or 0001) {  Num records 4 bits Number of Paging Group IDs associated with Receiver  For (i = 0; i <Num Records; i ++) {   Paging Information 32 bits 0-7: Paging Group ID, 8-23: Paging Cycle, 24-31: Paging Offset   }  }    Else If (Action Code == 0010) {    reserved 4 bits Shall be set to zero   }    Else If (Action Code == 0011) {    Num BSs 4 bits Number of BSs Queried.    For (j = 0; j <Num BSs; j ++) {    Queried BS ID 48 bits Identifier of Base Station of which Paging Information is included.    Num records 4 bits Number of Paging Group IDs associated with Queried BS    For (k = 0; k <Num Records; k ++) {    Paging Information 32 bits 0-7: Paging Group ID, 8-23: Paging Cycle, 24-31: Paging Offset    }   }  } Security field TBD A means to authenticate this message.

The base station may transmit information necessary for providing an idle mode by using an operation code of a paging-group-action response message transmitted to the paging controller by the base station (S52). For example, a paging controller may send a response to a paging group action request message sent to add or remove a paging group (Action Code = 0000), provide its own paging information (Action Code = 0001), Paging information of another base station may be requested (Action Code = 0010). Table 10 shows an example of a paging group operation response message.

Field Size Notes Message Type = 8 bits Sender ID 48 bits Identifier of Base Station sending this message. Receiver ID 48 bits Identifier of Paging Controller receiving this message Time stamp 32 bits Action code 4 bits 0000: Confirm the assignment to or removal from paging groups 0001: Information (Paging Information of Sender BS) 0010: Query (Paging Information of another BS) 0100 1111: reserved If (Action Code == 0000) {  reserved 4 bits Shall be set to zero  } Else If (Action Code == 0001) {  Num records 4 bits Number of Paging Group IDs associated with Sender BS.  For (i = 0; i <Num Records; i ++) {   Paging Information 32 bits 0-7: Paging Group ID, 8-23: Paging Cycle, 24-31: Paging Offset   }  } Else If (Action Code == 0010) {  Num BSs 4 bits Number of BSs of which Paging Information Sender BS wants to know   For (j = 0; j <Num BSs; j ++) {   Queried BS ID 48 bits Identifier of Base Station of which Paging Information is included.   }  } Security field TBD A means to authenticate this message.

FIG. 6 is a flowchart of a first embodiment showing a idle mode control method in a broadband wireless access system equipped with a paging controller. As shown in FIG. 6, when a mobile subscriber station (MSS) wants to switch to idle mode, the mobile subscriber station (MSS) transmits an idle mode switch request (DREG_REQ) message to a base station to which it belongs, and requests idle mode switch (S61). ). The DREG_REQ message includes information for requesting deregistration from a base station to which it belongs (De-registration Request Code) and TLV encoded information (for example, paging cycle request TLV, idle mode maintenance information TLV, and MAC Hash skip limit value TLV). It may include.

Upon receiving the idle mode switch request message, the base station transmits an idle mode information request message (Idle-Info-REQ) for notifying information of the mobile station requesting to switch to idle mode (S62). Table 11 shows an example of an idle mode information request message.

Field Size Notes Idle-Info-REQ message format () {  Global Message Header 12 bits  For (i = 0; i <Num Records; i ++) {   MSS MAC Address 48 bits   Action code 4 bits 0000: Idle Mode Initiation Request 0001: DL Traffic has arrived to MSS 0010: MSS session information 0011: MSS re-entry complete 0100: MSS has transitioned to another paging group 0101: Location Update Request 0110-1111: reserved   reserved 4 bits   TLV encoded information variable   Num_SFID_Records 8 bits   For (i = 1; i <Num_SFID_Records; i ++) {    SFID 32 bits    Num_QoS_Records 8 bits    For (i = 1; i <Num_QoS_Records; i ++)     TLV encoded information variable 11.13 Service flow management encodings.    }   }  }  Security field TBD A means to authenticate this message  }

Name Type Length Value Paging Information 4 0-7: Paging Group ID 8-23: Paging Cycle 24-31: Paging Offset Paging Controller ID 6 Logical network identifier for the serving BS or other network entity retatining MSS Service and operational information and / or administering paging activity for the MSS while in Idle Mode. Idle Mode Retain Information variable The first 8 bits of this item indicates Idle Mode Retain Information included in DREG-CMD message, and the rests are MSS service and operational information associated with Idle Mode Retain Information. This item may be included in Idle-Info-REQ message with Action Code = 0000. MAC Hash Skip Threshold One Maximum number that BS is allowed to skip MSS MAC address hash of an MSS in successive MOB_PAG-ADV messages when an Action Code for the MSS is 00, 'No Action Required'. The unit is the number of MOB_PAG-ADV message transmissions. HO Optimization flag One This item may be included Idle-Info-REQ message with Action Code = 0011.

As shown in Table 11, the idle mode information request message includes information indicating that a specific terminal requests to switch to idle mode, MAC address of the terminal, service flow information of the terminal, and TLV encoded information (for example, idle mode maintenance information TLV). , MAC Hash Omit Limit Value TLV).

Upon receiving the idle mode information request message, the paging controller transmits an idle mode information response (Idle-Info-RSP) message to the base station which has transmitted the idle mode information request message (S63).

Table 12 shows an example of an idle mode information response (Idle-Info-RSP) message.

Field Size Notes Idle-Info-RSP message format ()  Global Message Header 152 bits  For (i = 0; i <Num Records; i ++)  MSS MAC Address 48 bits  Action code 4 bits 0000: MSS enters Idle Mode 0001: MSS exits Idle Mode 0010: MSS session information 0011: Deliver DL Traffic to Current Attachment BS 0100: Location Update Success 0101: Location Update Failure 0110-1111: reserved  reserved 4 bits  TLV encoded information variable  For (i = 1; i <Num_SFID_Records; i ++)   SFID 32 bits   Num_QoS_Records 8 bits   For (i = 1; i <Num_QoS_Records; i ++)    TLV encoded information variable 11.13 Service flow management encodings    }   }  }  Security field TBD A means to authenticate this message  }

Name Type Length Value Paging Information 4 0-7: Paging Group ID 8-23: Paging Cycle 24-31: Paging Offset Paging Controller ID 6 Local network identifier for serving BS or other network entity retaining MSS Service and operational information and / or administering paging activity for the MSS while in Idle Mode. Idle Mode Retain Information One The first 8 bits of this item indicates Idle Mode Retain Information included in DREG-CMD message, and the rest bits are MSS service and operational information associated with Idle Mode Retain Information. This item may be included in Paging-announce message with Action Code is 0011. Current Attachment BS ID 6 BS ID to which MSS in Idle Mode attempts to re-enter network. This item may be included in Idle-Info-RSP message if Action Code is 0011. Last Attachment BS ID 6 BS ID in which MSS enters Idle Mode. Last Attachment BS can be updated after successful Location Update. This item may be included in Idle-Info-RSP message if Action Code is 0010. MAC Hash Skip Threshod One Maximum number that BS is allowed to skip MSS MAC address hash of an MSS in successive MOB_PAG-ADV message when an Action Code for the MSS is 00, 'No Action Required'. The unit is the number of MOB_PAG-ADV message transmissions. HO Optimization flag One This item may be included in Idle-Info-RSP message with Action Code = 0011, MSS re-entry complete

As shown in Table 12, the idle mode information response (Idle-Info-RSP) message indicates that the terminal has switched to the idle mode, the MAC address of the terminal, service flow information of the terminal, and TLV encoded information (for example, , Paging information TLV, paging controller ID TLV, idle mode maintenance information TLV, MAC hash skip limit value TLV).

The base station receiving the idle mode information response (Idle-Info-RSP) message transmits an idle mode indication message (DREG_CMD) to the terminal requesting the idle mode switch (S64). The idle mode indication message may include information indicative of idle mode switching and TLV encoded information (for example, paging information TLV, paging controller ID TLV, idle mode maintenance information TLV, and MAC hash skip limit value TLV). Can be.

When the terminal moves to the area of the second base station which is a base station belonging to another paging group in the idle mode, the terminal transmits a ranging request message (RNG_REQ) including a handover indicator TLV and a paging controller identifier TLV to the second base station. (S65), the second base station is informed that the idle mode is to end. The second base station notifies that the terminal has ended the idle mode by transmitting an idle mode information request (Idle-Info-REQ) message to the paging controller having the paging controller identifier received through the ranging request message (S66).

In addition, the second base station transmits a ranging response message (RNG_RSP) to the terminal (S67), the terminal performs a network entry procedure according to the ranging response message (S68). The paging controller may transmit an idle mode information response message indicating that the terminal has ended the idle mode to all base stations belonging to the previous paging group (S69). Each base station receiving the idle mode information response message updates the list of terminals currently in idle mode.

FIG. 7 is a flowchart of a second embodiment showing a idle mode control method in a broadband wireless access system equipped with a paging controller.

As shown in FIG. 7, when a mobile subscriber station (MSS) wants to switch to idle mode, the mobile subscriber station (MSS) transmits an idle mode switch request (DREG_REQ) message to a base station to which it belongs, and requests idle mode switch (S71). ). The DREG_REQ message includes information for requesting deregistration from a base station to which it belongs (De-registration Request Code) and TLV encoded information (for example, paging cycle request TLV, idle mode maintenance information TLV, and MAC Hash skip limit value TLV). It may include.

Upon receiving the idle mode switch request message, the base station transmits an idle mode information request message (Idle-Info-REQ) for notifying information of the mobile station requesting to switch to idle mode (S72). An example of the idle mode information request message is shown in Table 11. As shown in Table 11, the idle mode information request message includes information indicating that a specific terminal requests to switch to idle mode, MAC address of the terminal, service flow information of the terminal, and TLV encoded information (for example, idle mode maintenance information TLV). , MAC Hash Omit Limit Value TLV).

Upon receiving the idle mode information request message, the paging controller transmits an idle mode information response (Idle-Info-RSP) message to the base station which has transmitted the idle mode information request message (S73). Table 12 shows an example of an idle mode information response (Idle-Info-RSP) message.

 As shown in Table 12, the idle mode information response (Idle-Info-RSP) message indicates that the terminal has switched to the idle mode, the MAC address of the terminal, service flow information of the terminal, and TLV encoded information (for example, , Paging information TLV, paging controller ID TLV, idle mode maintenance information TLV, MAC hash skip limit value TLV).

The base station receiving the idle mode information response (Idle-Info-RSP) message transmits an idle mode indication message (DREG_CMD) to the terminal requesting the idle mode switch (S74). The idle mode indication message may include information indicative of idle mode switching and TLV encoded information (for example, paging information TLV, paging controller ID TLV, idle mode maintenance information TLV, and MAC hash skip limit value TLV). Can be.

When the terminal moves to the second base station area and the second base station belongs to a different paging group than the first base station, the terminal hands the second base station to request an idle mode location update procedure from the second base station that is the current serving base station. In addition to the over indicator TLV and the paging controller identifier TLV, the ranging request message including the location update request TLV is transmitted (S75). The second base station transmits an idle mode information request message requesting a location update to the paging controller (S76). The paging controller transmits an idle mode information response message to the second base station as a response (S77), and the second base station notifies the terminal of the successful location update through the ranging response message (S78).

Meanwhile, the paging controller may transmit an idle mode information response message indicating that the terminal has ended the idle mode to all base stations in the paging group to which the first base station belongs (S79). Each base station receiving the idle mode information response message updates the list of terminals currently in idle mode.

8 is a flowchart of a third embodiment showing a method for controlling idle mode in a broadband wireless access system equipped with a paging controller.

As illustrated in FIG. 8, when a mobile subscriber station (MSS) wants to switch to an idle mode, the mobile subscriber station (MSS) transmits an idle mode switch request (DREG_REQ) message to a base station to which it belongs, and requests idle mode switch (S81). ). The DREG_REQ message includes information for requesting deregistration from a base station to which it belongs (De-registration Request Code) and TLV encoded information (for example, paging cycle request TLV, idle mode maintenance information TLV, and MAC Hash skip limit value TLV). It may include.

Upon receiving the idle mode switch request message, the base station transmits an idle mode information request message (Idle-Info-REQ) for notifying information of the mobile station requesting to switch to idle mode (S82). An example of the idle mode information request message is shown in Table 9. As shown in Table 11, the idle mode information request message includes information indicating that a specific terminal requests to switch to idle mode, MAC address of the terminal, service flow information of the terminal, and TLV encoded information (for example, idle mode maintenance information TLV). , MAC Hash Omit Limit Value TLV).

The paging controller receiving the idle mode information request message transmits an idle mode information response (Idle-Info-RSP) message to the base station which has transmitted the idle mode information request message (S83). Table 12 shows an example of an idle mode information response (Idle-Info-RSP) message.

 As shown in Table 12, the idle mode information response (Idle-Info-RSP) message indicates that the terminal has switched to the idle mode, the MAC address of the terminal, service flow information of the terminal, and TLV encoded information (for example, , Paging information TLV, paging controller ID TLV, idle mode maintenance information TLV, MAC hash skip limit value TLV).

The base station receiving the idle mode information response (Idle-Info-RSP) message transmits an idle mode indication message (DREG-CMD) to the terminal requesting the idle mode switch (S84). The idle mode indication message may include information indicative of idle mode switching and TLV encoded information (for example, paging information TLV, paging controller ID TLV, idle mode maintenance information TLV, and MAC hash skip limit value TLV). Can be.

 When the terminal moves to the second base station area, and the second base station belongs to a different paging group from the first base station, the terminal transmits a ranging request message to the first base station to request a location update (S85).

If the second base station notifies the terminal that it cannot perform the requested location update procedure through the ranging response message (S86), the terminal performs a procedure for re-entering the network (S87). When the terminal performs the reentry procedure to the network, the second base station transmits an idle mode information request message to the paging controller to inform the paging controller that the terminal has re-enter the network (S88).

The paging controller may transmit an idle mode information response message indicating that the terminal has ended the idle mode to all base stations in the paging group to which the first base station belongs (S89). Each base station receiving the idle mode information response message updates the list of terminals currently in idle mode.

FIG. 9 is a flowchart of a fourth embodiment showing a idle mode control method in a broadband wireless access system equipped with a paging controller.

As shown in FIG. 9, when a mobile subscriber station (MSS) wants to switch to idle mode, the mobile subscriber station (MSS) transmits an idle mode switch request (DREG_REQ) message to a base station to which it belongs, and requests idle mode switch (S91). ). The DREG_REQ message includes information for requesting deregistration from a base station to which it belongs (De-registration Request Code) and TLV encoded information (for example, paging cycle request TLV, idle mode maintenance information TLV, and MAC Hash skip limit value TLV). It may include.

Upon receiving the idle mode switch request message, the base station transmits an idle mode information request message (Idle-Info-REQ) for notifying information of the mobile station requesting to switch to idle mode (S92). An example of the idle mode information request message is shown in Table 11. As shown in Table 11, the idle mode information request message includes information indicating that a specific terminal requests to switch to idle mode, MAC address of the terminal, service flow information of the terminal, and TLV encoded information (for example, idle mode maintenance information TLV). , MAC Hash Omit Limit Value TLV).

Upon receiving the idle mode information request message, the paging controller transmits an idle mode information response (Idle-Info-RSP) message to the base station which has transmitted the idle mode information request message (S93). Table 12 shows an example of an idle mode information response (Idle-Info-RSP) message.

 As shown in Table 12, the idle mode information response (Idle-Info-RSP) message indicates that the terminal has switched to the idle mode, the MAC address of the terminal, service flow information of the terminal, and TLV encoded information (for example, , Paging information TLV, paging controller ID TLV, idle mode maintenance information TLV, MAC hash skip limit value TLV).

The base station receiving the idle mode information response (Idle-Info-RSP) message transmits an idle mode indication message (DREG-CMD) to the terminal requesting the idle mode switch (S94). The idle mode indication message may include information indicative of idle mode switching and TLV encoded information (for example, paging information TLV, paging controller ID TLV, idle mode maintenance information TLV, and MAC hash skip limit value TLV). Can be.

When the terminal moves to the second base station area, and the second base station belongs to a different paging group from the first base station, the terminal transmits a ranging request message to the second base station to request a location update (S95).

The second base station notifies that the terminal has requested a location update by transmitting an idle mode information request message to the paging controller (S96). If it is impossible for the paging controller to perform the requested location update procedure, it notifies the second base station that the requested location update procedure cannot be performed through the idle mode information response message (S97). Then, the second base station notifies the terminal that the location update procedure has failed through the ranging response message (S98). The terminal performs a procedure for re-entering the network according to the ranging response message (S99).

When network reentry ends, the second base station notifies the paging controller that network reentry is terminated through an idle mode information request message (S100). The paging controller may transmit an idle mode information response message indicating that the terminal has ended the idle mode to all base stations in the paging group to which the first base station belongs (S101). Each base station receiving this message updates the list of terminals currently in idle mode.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

According to the idle mode control method of a terminal in the broadband wireless access system according to the present invention, when the terminal in the idle mode is out of the paging area, the idle mode for the existing paging area can be effectively terminated to prevent unnecessary traffic generation. It can work.

In addition, the present invention has the effect of more efficiently controlling the idle mode using the paging controller.

Claims (8)

In the method of ending the idle mode in the first paging area when the UE in the idle mode in the first paging zone moves to another paging area (second paging area), A first step of receiving, by the base station (current base station) to which the terminal currently belongs, an identifier (base station ID) of the base station (first base station) that has allowed the terminal to switch to idle mode in the first paging area; A second step of the current base station notifying the first base station that the terminal has moved to the second paging area; A third step of the first base station notifying the base stations belonging to the first paging area to remove the terminal from the paging list; And And a fourth step of the base stations belonging to the first paging area to remove the terminal from the paging list. The method of claim 1, The first step is performed by the terminal in the network re-registration through the current base station, characterized in that the idle mode termination method of the terminal in a broadband wireless access system. The method of claim 1, The notification of the second step is included in a specific message transmitted by a wired connection between the current base station and the first base station is transmitted, characterized in that the idle mode of the terminal in a broadband wireless access system. The method of claim 1, And the notification of the third step is broadcasted. An idle mode control method applied when a terminal moves from a first base station area belonging to a first paging group to a second base station area belonging to a second paging group, Receiving, by the second base station, a ranging request message from the terminal; Transmitting, by the second base station, a message indicating that the terminal has entered a base station belonging to a second paging area to a paging controller; Transmitting a ranging response message corresponding to the ranging request message to the terminal; And Performing a network re-entry procedure of the terminal Idle mode control method comprising a.  An idle mode control method applied when a terminal moves from a first base station area belonging to a first paging group to a second base station area belonging to a second paging group, Receiving, by the second base station, a ranging request message for updating location information from the terminal; Transmitting, by the second base station, information regarding a location information update request of a terminal that has entered a base station belonging to the second paging area to the paging controller; Receiving information indicating that the location information of the terminal has been successfully updated from the paging controller; Transmitting a message indicating that the location information update has been successfully made to the terminal; Idle mode control method comprising a.  An idle mode control method applied when a terminal moves from a first base station area belonging to a first paging group to a second base station area belonging to a second paging group, Receiving, by the second base station, a ranging request message for updating location information from the terminal; Notifying the terminal that the location information update procedure is impossible; Performing a network reentry procedure of the terminal; And Transmitting a message indicating that the terminal has re-entered the network to a paging controller Idle mode control method comprising a.  An idle mode control method applied when a terminal moves from a first base station area belonging to a first paging group to a second base station area belonging to a second paging group,  Receiving, by the second base station, a ranging request message for updating location information from the terminal; Transmitting, by the second base station, information regarding a location information update request of a terminal that has entered a base station belonging to the second paging area to the paging controller; Receiving information indicating that the location information update of the terminal has failed from the paging controller; and Transmitting a message indicating that the location information update failed to the terminal;  Performing a network reentry procedure of the terminal; And Transmitting a message indicating that the terminal has re-entered the network to a paging controller Idle mode control method comprising a.

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