KR20060043533A - Method of supporting idle mode of mss in broadband wireless access system - Google Patents

Abstract

The present invention relates to a method for supporting idle mode of a terminal in a broadband wireless access system. The idle mode support method of a terminal in a broadband wireless access system according to the present invention is a wireless access system including at least one or more paging zones (paging zone) consisting of a plurality of base stations, switching from the terminal to the idle mode (idle mode) Receiving a message requesting a request; Transmitting a message allowing the terminal to switch to idle mode; Transmitting a message to the base stations belonging to the same paging area, the message including an identifier of terminals switched to idle mode and information on an action to be taken by the terminals; And transmitting, by the base stations belonging to the same paging area, a message including the identifiers of the terminals and information on the operations to be performed by the terminals through paging to the terminals.

Wireless access system, base station, terminal, idle mode, paging

Description

Method of supporting idle mode of a terminal in a broadband wireless access system {Method of supporting idle mode of MSS in broadband wireless access system}

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

2 is a process flow diagram of one preferred embodiment of the present invention.

3 is a flowchart illustrating a procedure for terminating idle mode when downlink traffic to be delivered to a terminal in idle mode occurs.

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.

6 is a flowchart illustrating an idle mode initiation procedure in a broadband wireless access system equipped with a paging controller.

7 is a flowchart illustrating a case where traffic is generated in an idle terminal in a broadband wireless access system equipped with a paging controller.

The present invention relates to a broadband wireless access system for supporting the wireless Internet. More specifically, the present invention relates to a method for supporting idle mode of a terminal in a broadband wireless access system.

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 have to transmit uplink information for the handoff 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, the terminal entering the idle mode can be freely moved in the same paging area without performing the handoff procedure by normally receiving the periodic paging unless there is information to be transmitted or received.

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.

The mobile terminal uses DREG_REQ, which is one of the existing MAC messages, to switch to the idle mode. The format of the DERG_REQ message is 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 must page the MAC address 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 (downward traffic), the terminal receives periodic paging due to leaving the current paging area or due to a problem in the transmission process. If not, you must exit idle mode.

The biggest problem of the prior art as described above is that there is a mismatch between the paging guide backbone message (Table 5) and the operation to be performed by the terminal during the idle mode defined in the paging message (Table 6).

The conventional paging guide backbone message includes only the MAC (Medium Access Control) addresses of terminals to be paging. Thus, the base station receiving the paging guidance backbone message can clearly know that the terminals are currently in the idle mode, but can not know at all what action each terminal should take. Thus, a problem arises in that the action code of the paging message cannot be determined.

In addition, since the current paging announcement backbone message specifies that only the MAC addresses of terminals included in the message are to be paging at every paging cycle, when a terminal exits idle mode, the MAC address of the terminal should be removed from the paging list. I can't tell you.

Meanwhile, in the prior art, when transmitting a paging message to terminals in idle mode, the prior art also includes MAC addresses of terminals that may remain in idle mode. Including the MAC addresses of terminals that do not require any action in all paging messages has a problem of wasteful radio resources.

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to take the terminal in the idle mode (idle mode) state that is a technique for minimizing the terminal power consumption of the broadband wireless access system The present invention provides a method for supporting idle mode of a terminal in a broadband wireless access system capable of guaranteeing accurate operation of idle mode by precisely specifying operations.

Summary of the Invention

The idle mode support method of a terminal in a broadband wireless access system according to the present invention is a wireless access system including at least one or more paging zones (paging zone) consisting of a plurality of base stations, switching from the terminal to the idle mode (idle mode) Receiving a message requesting a request; Transmitting a message allowing the terminal to switch to idle mode; Transmitting a message to the base stations belonging to the same paging area, the message including an identifier of terminals switched to idle mode and information on an action to be taken by the terminals; And transmitting, by the base stations belonging to the same paging area, a message including the identifiers of the terminals and information on the operations to be performed by the terminals through paging to the terminals.

Example

Hereinafter, preferred embodiments of the idle mode support method of a terminal in a broadband wireless access system according to the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating an embodiment of a paging group. As shown in FIG. 1, 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.

2 is a process flow diagram of a preferred embodiment of the present invention. Referring to FIG. 2, in order to switch to the idle mode, the mobile terminal requests the base station to switch to the idle mode by using one of the existing MAC messages, DREG_REQ (S21). The format of the DERG_REQ message is shown in Table 2.

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.

The base station receiving the DERG_REQ message responds to the request of the terminal through the existing DREG_CMD message (S22). The format of the DREG_CMD message is shown in Table 3.

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 to 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 group 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 is delivered to all base stations belonging to the same paging group (S23).

However, in order to solve the problems of the prior art, the present invention adds an action code for specifying a necessary action for terminals in idle mode to a paging guide backbone message.

Therefore, 'Num MSS', 'MSS MAC address', 'PAGING CYCLE', and 'PAGING OFFSET' in the fields of the paging announcement backbone message shown in Table 5 are changed as shown in Table 7 below.

Num MSS 8 bit Number of MSSs to need an action For (j = 0; j <Num MSS; j ++) { MSS MAC address 48 bit Action code 3 bit 0 = Add the MSS to paging list 1 = Remove the MSS from paging list 2 = Perform ranging to establish location and acknowledgement message 3 = Enter Network 4-7 = Reserved 5 bit reserved   }

According to the present invention, the conventional PAGING_CYCLE (16 bit) and PAGING_OFFSET (8 bit) can be removed. This is because base stations belonging to the same paging area all have the same paging period and paging offset.

Instead, add a 3-bit action code to the paging announcement backbone message, add the MAC address of a specific terminal to the paging list (Action Code = 0), or remove the MAC address of a specific terminal from the paging list (Action Code = 1 It is possible to specify to perform ranging (Action Code = 2) to update the location information, or to exit the idle mode and perform the re-registration procedure to the network again (Action Code = 3).

Table 6 shows the format of a paging message (MOB-PAG_ADV) that each base station transmits through paging to terminals in idle mode. The paging message is preferably 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).

The base station, which allows the transition to the idle mode of a terminal, transmits by setting the action code of the paging guide backbone message to 0 to all base stations included in the same paging area (S23). Upon receiving the paging announcement backbone message, the base stations store the MAC address of the terminal in their paging list and transmit the same through a paging message (MOB-PAG_ADV) every paging period (S24).

Since only the fact that the terminal can receive the paging message can know that it can maintain the idle mode, the terminal requiring some action, that is, the network must be re-registered or the ranging for location information update is required. By including only the MAC address of the terminal to be performed can be a waste of radio resources. Therefore, it is preferable to change the 'MSS MAC Address hash' and 'Action Code' field parts of the paging message (MOB-PAG_ADV) shown in Table 6 as shown in Table 8 below.

For (j = 0; j <Num_MACs; j ++) { MSS MAC Address hash 24 bit Action code 2 bit 00 = Enter Network 01 = Perform Ranging to establish location and acknowledgment message 10-11 = reserved

If there is downlink traffic to be delivered to the terminal and the terminal needs to exit the idle mode, the base station cannot know which base station in the paging area the terminal is currently in, so that the changed paging guide backbone message is not included. Set the action code to 3 to pass it to all base stations in the same paging area.

The base stations receiving the paging guide backbone message may broadcast the action code of the paging message to 00 to all terminals to allow the corresponding terminal to terminate the idle mode and perform a procedure for re-registration into the network.

After the terminal normally exits the idle mode, the base station may set the action code of the changed paging guide backbone message to 1 to all base stations in the paging area so as not to paging the terminal in the future.

3 is a flowchart illustrating a procedure of terminating idle mode when downlink traffic to be delivered to a terminal in idle mode occurs. Referring to FIG. 3, since the base stations do not know which base station the terminal in the idle mode is in, downlink traffic is unconditionally transmitted to the base station (first base station) that the terminal first requests 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. The code is set to 11 to transmit the paging announcement backbone message (S31).

After receiving the paging announcement message, all base stations transmit the broadcast code by setting the action code of the paging message (MOV_PAG_ADV) to 10 to all mobile terminals in its area (S32).

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 (S33). 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. (S34). The MSS_Info_Request backbone message has the format shown in Table 9 below.

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 first base station also preferably transmits the traffic of the mobile terminal that has been received to it through a data transfer message having a format as shown in Table 10.

Field Size Notes Global Header 152 bit Length 8 bit The length in bytes of the MAC SDU including the Global Header, MSS unique identifier, and Security field. MSS unique identifier 48 bit 48-bit unique identifier used by MSS on initial network entry MAC SDU Variable received data Security field TBD A means to authenticate this message

In cases where it is necessary to terminate the idle mode of the terminal except for the case where there is downlink traffic to be transmitted to the terminal and the terminal needs to exit the idle mode, the base station causes the terminal to exit the idle mode through paging. Before the request, the terminal first performs the procedure of exiting the idle mode.

The base station receiving the request to exit the idle mode from the terminal and re-register with the network transmits the terminal to the paging list by setting the action code of the paging guide backbone message to 1 to all base stations belonging to the same paging area. Remove from.

Hereinafter, if there is a paging controller, the idle mode support method using the same will be described.

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 11 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 12 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 illustrating an idle mode initiation procedure 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 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. (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 hash limit value). TLV).

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 13 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: MSS responded to paging 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 13, 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 (S63). In this case, when the idle mode information request message transmitted from the base station includes information on the MAC hash skip limit value, the paging controller transmits the idle mode information response message to all base stations belonging to the paging group (S65). .

Table 14 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 0100-1111: 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 Threshold 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 14, 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.

FIG. 7 is a flowchart illustrating a case where traffic is generated in an idle terminal in a broadband wireless access system equipped with a paging controller. As shown in Figure 7, the terminal switches to the idle mode state (S71 ~ S74). The terminal in the idle mode may stay in the base station area where the switch to the idle mode or move to another base station area. In the present embodiment, an example in which the terminal moves to the second base station area in the idle mode will be described.

When downlink traffic occurs in the idle mode, the base station (hereinafter referred to as the first base station) to which the terminal belongs when the idle mode is switched transmits information indicating that downlink traffic has occurred to the terminal in the idle mode. (S75).

The paging controller transmits a paging-announce message to all base stations present in the paging area to inform the terminal in the idle mode of exiting the idle mode and re-entering the network (S76 to S77). Accordingly, the base stations broadcast a paging advertisement message (MOB_PAG-ADV), an example of which is shown in Table 6.

Table 15 shows an example of a paging notification message.

Field Size Notes Paging-announce 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 shall be paged to re-enter network 0001: MSS shall be paged to perform ranging 0010-1111: reserved   reserved 4 bits  } Security field TBD A means to authenticate this message }

In the idle mode, the UE, which has moved to the area of the second base station, recognizes that downlink traffic has occurred to itself through a paging advertisement message (MOB_PAG-ADV) that is broadcast at regular intervals in the paging area and reenters the network. The gong request message is transmitted to the second base station (S78). The second base station notifies the paging controller that the terminal has responded to the paging using the idle mode information request message, and requests the terminal session information before switching to the idle mode (S79). The paging controller transmits an idle mode information response message including session information of the terminal and information on the base station where the terminal is located when the terminal switches to the idle mode (S80).

The second base station transmits a ranging response message including the handover optimization flag to the terminal based on session information and idle mode maintenance information of the terminal transmitted by the paging controller (S81). When the terminal performs the network re-entry process (S82), the second base station in charge of the area where the current terminal is located to inform the paging controller that the terminal has re-enter the network using the idle mode information request message (S83). In this case, the second base station may include a handover optimization flag included in the ranging response message.

 The paging controller recognizes that the terminal has re-entered the network in the second base station area after the terminal has switched to the idle mode at the first base station, and uses the idle mode information response message to transmit the traffic delivered to the first base station to the second base station. Instructs to transmit to the terminal through (S84).

The first base station transmits the traffic to the second base station according to the instruction of the paging controller, the second base station transmits the traffic to the terminal (S85). The paging controller informs all the base stations belonging to the paging group that the terminal has exited the idle mode by using the idle mode information response message (S86). Each base station receiving the idle mode information response message from a paging controller removes the MAC address of the terminal from the idle mode terminal list.

In the embodiment shown in FIG. 7, when downlink traffic to be delivered to the terminal in the idle mode is transmitted through the paging controller, step S75 or S84 may be omitted.

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 present invention, a paging message (MOB) that a terminal should deliver to all terminals in idle mode by allowing each base station to accurately specify the operation of terminals in idle mode through paging in a paging guide backbone message transmitted by wire between base stations. -PAG_ADV) can effectively reduce the size of.

In addition, the present invention has an effect that can support the idle mode more efficiently by using a paging controller in a broadband wireless access system having a paging controller.

Claims (10)

A wireless access system comprising at least one paging zone composed of a plurality of base stations, Receiving a message requesting to switch to idle mode from the terminal; Transmitting a message allowing the terminal to switch to idle mode; Transmitting a message to the base stations belonging to the same paging area, the message including an identifier of terminals switched to idle mode and information on an action to be taken by the terminals; And And transmitting, by the base stations belonging to the same paging area, a message including the identifiers of the terminals and information on the operations to be performed by the terminals through paging to the terminals. The method of claim 1, The identifier of the terminal is an idle mode support method of the terminal, characterized in that the MAC (Medium Access Control) address. The method of claim 1, The operation to be performed by the terminals is the idle mode support method of the terminal, characterized in that performing the ranging (ranging) for location information update. The method of claim 1, The operation to be performed by the terminal is idle mode support method of the terminal, characterized in that for performing the re-registration procedure to the network. The method of claim 1, If the downlink traffic to be delivered to the terminal that allows the transition to the idle mode of the base station, further comprising the step of transmitting the traffic of the mobile terminal received to the base station to which the terminal belongs; Idle mode support method of the terminal. In the broadband wireless access system having a paging group consisting of at least one base station and a paging controller for controlling the idle mode for the paging group, Idle mode support method, The base station receiving information for an idle mode switch request from a specific mobile station; Transmitting information for the idle mode switch request to a paging controller; Receiving, from the paging controller, information on whether to allow the idle mode switching and information on maintaining an idle mode; And Transmitting, to the specific mobile station, information on whether to allow the idle mode to be switched and information on maintaining the idle mode; Idle mode support method comprising a. The method of claim 6, The idle mode switch request information transmitted from the mobile station to the base station is transmitted using an idle mode request message (DREG-REQ). The method of claim 6, The idle mode switch request information transmitted from the base station to the paging controller is transmitted using an idle mode information request message (Idle-Info-REQ). The method of claim 6, The idle mode information transmitted from the paging controller to the base station whether to allow the idle mode and the information about the idle mode maintenance is transmitted using an idle mode information response message (Idle-Info-RSP) How to apply. The method of claim 6, Idle mode support method, characterized in that the information about whether to allow the idle mode switching and the idle mode transmitted from the base station is transmitted using an idle mode indication message (DREG-CMD).

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