KR20090044946A - Paging method in wireless communication system and system thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to an operation method according to a mobile station not receiving a paging message. The mobile station determines whether the paging message is received from the base station at a paging listening interval, which is a time interval for receiving the paging message, and if the paging listening interval has not received the paging message until the paging listening interval expires, A ranging request message is transmitted to the base station requesting a location update according to the non-paging message, and a ranging response message is received from the base station.

Paging message, paging listening interval, ranging request, ranging response

Description

Paging method in wireless communication system and system thereof {PAGING METHOD IN WIRELESS COMMUNICATION SYSTEM AND SYSTEM THEREOF}

The present invention relates to a wireless communication system, and more particularly, to a method and system for paging a mobile station by a base station in a wireless communication system.

In the 4th Generation (hereinafter, referred to as '4G') communication system, a research and commercialization for providing various services having a transmission speed of about 100 Mbps or more to users are in progress. In particular, current 4G communication systems have mobility in Broadband Wireless Access (BWA) communication systems, such as wireless local area network (LAN) systems and metropolitan area network (MAN) systems. Research is being actively conducted to support high-speed services while guaranteeing quality of service (QoS) and quality of service (QoS), and the representative communication system is IEEE (Institute of Electrical and Electronics Engineers) 802.16 communication system.

According to the IEEE 802.16 communication system standard, a mobile station can operate in an idle mode when there is no traffic to transmit and receive for a predetermined time, thereby minimizing power consumption. That is, the mobile station will be referred to as a de-registration request (hereinafter referred to as 'DREG-REQ') to the serving base station that is currently performing communication in order to operate in the idle mode because there is no traffic to transmit and receive. ) Send the message. Upon receiving the DREG-REQ, the serving base station transmits a DREG command (hereinafter, referred to as a 'DREG-CMD') message to the mobile station to allow a transition operation to the idle mode. Detailed descriptions of parts of the DREG-REQ message and the DREG-CMD message that are not directly related to the present invention will be omitted.

The DREG-CMD message includes a paging information TLV (Type / Length / Value) field. The paging information TLV field includes a paging group identifier (hereinafter, referred to as a 'PG-ID'), a paging cycle, and a paging offset parameter.

The PG-ID is an identifier for identifying a paging group, and the paging group is composed of a plurality of cells. The paging cycle parameter is a paging cycle determined by referring to a paging cycle request requested by the mobile station. The paging offset parameter is a parameter used to determine when a specific mobile station can be called using a frame number and the paging period parameter.

1 is a diagram illustrating a general paging procedure.

Referring to FIG. 1, the mobile station 100 transmits 101 a DREG-REQ message to the base station 150. The base station 150 transmits a DREG-CMD message to the mobile station 100 in response to the DREG-REQ message (103). The DREG-CMD message includes paging offset 105 information, and the mobile station 100 waits for the paging offset 105 and then starts a paging period 113 from the N1 frame. A predetermined interval in the paging period 113 corresponds to a paging listening interval 107. The paging listening interval 107 is a section in which the mobile station 100 can receive a paging advertisement (hereinafter, referred to as MOB_PAG-ADV) message. The paging listening interval 107 is a time at which the mobile station 100 synchronizes downlink with the base station 150 and decodes the MOB_PAG-ADV message. The paging listening interval 107 starts at a frame number that satisfies a condition as shown in Equation 1 below and is maintained for a paging listening interval length.

In Equation 1, mod denotes a modulo operation.

That is, the mobile station 100 may receive a MOB_PAG-ADV message for each paging listening interval 107, 109, 111 of the paging period 113, 115, 117. The MOB_PAG-ADV message is used for network entry and location update of the mobile station. That is, when downlink traffic occurs, the base station transmits a MOB_PAG-ADV message at a paging listening interval to cause the mobile station to perform network entry or location update.

The MOB_PAG-ADV message type is shown in Table 1 below.

Syntax Size Notes MOB_PAG-ADV_Message_Format () { Management Message Type = 62 8 bits Num_Paging_Group_Ids 8 bits For (i = 0; i <Num_Paging_Group_IDs; i ++) { Paging Group ID 16 bits } Num_MACs 8 bits For (j = 0; j <Num_MACs; j ++) { MS MAC Address hash 24 bits 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 = Reserved Reserved 6 bits } Padding TLV Encoded Information }

In Table 1, the paging group ID means a paging group identifier to which the base station belongs. The paging group identifier is used for location update. The location update will be described in more detail below. The MS MAC Address Hash is a medium access control (MAC) address hash value of the mobile station to which the base station controls the operation through the MOB_PAG-ADV message, that is, the remaining value obtained by dividing the MAC address of the mobile station by a specific polynomial. it means. The action to be taken by the control target mobile station is determined by an action code field of the MOB_PAG-ADV message. Among the action code values, '0b00' is a value indicating that the mobile station does not need to perform any operation, '0b01' is a value indicating that the mobile station should perform a location update, and '0b10' is the mobile station. This value indicates that network entry should be performed.

On the other hand, the MOB_PAG-ADV message is a message that the base station must transmit in accordance with the paging period of the mobile station. That is, even if the base station does not need to perform paging for the mobile station operating in the idle mode, at least one MOB_PAG-ADV message should be transmitted during the paging listening interval so as to recognize the paging group to which the mobile station belongs. do. Accordingly, the mobile station wakes up in accordance with the paging period and waits for a MOB_PAG-ADV message during the paging listening interval. However, the mobile station may not receive the MOB_PAG-ADV message due to poor channel condition or handover.

Currently, the IEEE 802.16 standard does not specify the action to be taken when the mobile station does not receive the MOB_PAG-ADV message during the paging listening interval. However, if the base station transmits a MOB_PAG-ADV message in the current paging period and there is no response from the mobile station until the current paging period expires, the base station transmits the MOB_PAG-ADV message again at the next paging period. As such, if the base station does not receive a response to the MOB_PAG-ADV message from the mobile station, the base station retransmits the MOB_PAG-ADV message every paging period. However, the maximum number of retransmissions of the MOB_PAG-ADV message is determined by a paging retry count. In the worst case, a paging latency delay may occur by multiplying the number of paging cycles by the paging retransmission count. Therefore, there is a need for a method for reducing paging latency delay caused by the mobile station not receiving a MOB_PAG-ADV message.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method and system for reducing paging latency when a mobile station does not receive a paging message in a wireless communication system.

Another object of the present invention is to provide a method and a system for reducing power consumption by allowing a mobile station to operate in an idle mode when a mobile station does not receive a paging message.

The first method of the present invention; In a wireless communication system, a method for operating a mobile station according to a paging message not received, the method comprising: determining whether the paging message is received from a base station at a paging listening interval, which is a time interval for receiving the paging message; If a paging message is not received until the paging listening interval expires, transmitting a ranging request message requesting a location update according to the non-paging message is received, and receiving a ranging response message from the base station. Include.

The second method of the present invention; In a wireless communication system, a method for operating a mobile station according to a paging message not received, the method comprising: determining whether the paging message is received from a base station at a paging listening interval, which is a time interval for receiving the paging message; If a paging message is not received until the paging listening interval expires, the method includes transmitting a ranging request message requesting a location update to the base station, and receiving a ranging response message from the base station.

The third method of the present invention; In a wireless communication system, a method of operating a paging message by a base station, the method comprising: transmitting the paging message to a mobile station at a paging listening interval, which is a time interval for receiving the paging message; When the ranging request message is received, determining whether the ranging request message includes a ranging purpose indication field; and the ranging request message includes a ranging purpose indication field, and the ranging purpose indication field is included in the ranging request message. Is set to a value that requires the mobile station to update its location according to the non-paging message, determining whether the mobile station has been paged before receiving the ranging request message, and if the mobile station is paged, Allow network entry A ranging response message including a location update response field indicating the execution order comprises the step of transmitting to the mobile station.

The fourth method of the present invention; In a wireless communication system, a method for operating a mobile station according to a paging message not received, the method comprising: transmitting to a base station including a field indicating whether to perform a location update when a paging message is not received in a first message used for an idle mode transition request; Receiving a second message, which is a response message to an idle mode transition request including a field to perform a location update when the paging message is not received from the base station, and a paging listening interval that is a time interval for receiving the paging message. and determining whether to receive the paging message from the base station in a listening interval, and performing a location update when the paging message is not received until the paging listening interval expires.

The system of the present invention; A mobile station and a base station, wherein the mobile station determines whether to receive the paging message from the base station at a paging listening interval, which is a time interval for receiving a paging message, and a paging message until the paging listening interval expires. If not received, transmits a ranging request message requesting a location update according to the non-paging message to the base station, receives a ranging response message from the base station, the base station transmits a paging message to the mobile station, Upon receiving a ranging request message for requesting a location update according to the non-paging message, the mobile station transmits a ranging response message to the mobile station.

The present invention has the advantage of reducing paging latency in a wireless communication system. In addition, the mobile station has an advantage of enabling seamless communication by quickly performing a location update upon paging group change.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation of the present invention will be described, and other background art will be omitted so as not to distract from the gist of the present invention.

The present invention provides a paging method and system that can reduce paging latency delay in a wireless communication system. Accordingly, in the embodiments of the present invention, when a mobile station does not receive a paging advertisement message (hereinafter referred to as 'MOB_PAG-ADV') during a paging listening interval, A newly proposed ranging request (hereinafter, referred to as 'RNG-REQ') message is transmitted to the base station. Upon receiving the new RNG-REQ message, the base station transmits a ranging response (hereinafter, referred to as 'RNG-RSP') message to the mobile station to allow the mobile station to perform a network entry procedure.

Prior to the description of the present invention, location update of the mobile station will be described. The location update occurs when a specific period occurs or when the paging group is changed and moved. There are four types of location updates.

The first location update method is Paging Group based Location Update. The mobile station knows the identifier, paging period, and paging offset of the paging group to which it belongs through a de-registration command (hereinafter, referred to as a 'DREG-CMD') message received from the base station during the transition to the idle mode. If the paging group identifier included in the MOB_PAG-ADV message received by the mobile station during the paging listening interval is different from the paging group identifier included in the DREG-CMD message, the mobile station performs a location update. The mobile station transmits an RNG-REQ message as shown in Table 2 below to perform the location update.

Syntax Size Notes RNG-REQ_Message_Format () { Management Message Type = 4 8 bits Reserved 8 bits TLV Encoded Information }

The TLV Encoded Information field of the RNG-REQ message includes a ranging purpose indication field as shown in Table 3 below.

Name Type Length Value Ranging Purpose Indication 6 One Bit # 0: HO indication (when this bit is set to 1 in combination with other included information elements indicates the MS is currently attempting to HO or Network Re-entry from Idle Mode to the BS) Bit # 1: Location Update Request (when this bit is set to 1, it indicates MS action of Idle Mode Location Update Process) Bits 2-7: Reserved SS MAC Address 2 6 The MAC address of the SS

The mobile station transmits an RNG-REQ message with Bit # 1 of Raging Purpose Indication set to 1 to perform location update. The base station receiving the RNG-REQ message transmits an RNG-RSP message as shown in Table 4 to the mobile station.

Syntax Size Notes RNG-RSP_Message_Format () { Management Message Type = 5 8 bits Reserved 8 bits TLV Encoded Information }

The TLV Encoded Information field of the RNG-RSP message includes the fields shown in Table 5 below.

Name Type Length Value Location Update Response 23 One 0x00 = Success of Location Update 0x01 = Failure of Location Update 0x02 = Reserved 0x03 = Success of location update and DL traffic pending 0x04 ~ 0xFF: Reserved Paging Information 134 7 Bits # 0-15: PAGING_CYCLE-cycle in which the paging message is transmitted within the paging group. Bits # 16-31: PAGING_OFFSET-determines the frame within the cycle in which the paging message is transmitted. Must be smaller than PAGING_CYCLE value. Bits # 32-47: Paging-group-ID-ID of the paging group the MS is assigned to. Bits # 48-55: Paging Interval Length-Max duration in frames of Paging Listening interval. Used in calculation of Paging listening interval; value must be between 1 and 5 frames (default = 2). Paging Controller ID 135 6 This is a logical network identifier for the serving BS or other network entity retaining MS service and operational information and / or administering paging activity for the MS while in IDLE Mode.

The base station includes an RNG including a Location Update Response field, a Paging Information field, and a Paging Controller ID field in response to an RNG-REQ message requesting a location update of the mobile station. Send an RSP message to the mobile station.

The Location Update Response field is a value (0x00) indicating that the location update of the mobile station was successful, a value indicating that the location update has failed (0x01), and a value indicating that the downlink traffic is pending transmission (0x03). Is used to inform the mobile station of either value. The Paging Information field is used to inform the mobile station of paging related information that changes as the mobile station moves to a new paging group. The Paging Controller ID field is used to inform the mobile station of the paging controller identifier.

The second location update method is a timer based location update. The mobile station performs timer-based location updates at regular intervals even if they remain in the same paging group.

The third location update method is a power down location update. The mobile station notifies the base station before powering off, thereby causing the base station to not manage the idle mode state of the mobile station. In order to perform the power saving location update, the mobile station transmits an RNG-REQ message including a field as shown in Table 6 to the base station.

Name Type Length Value Power down indicator 8 One Presence of item in message indicates the MS is cur-rently attempting to switch power off, regardless of value

The power down indicator field of Table 6 is used by the mobile station to power down, and the base station does not need to participate in the idle mode of the mobile station. Thus, the base station does not need to send an RNG-RSP message to the mobile station.

The fourth location update method is a MAC Hash Skip Threshold Location Update (MAC). If the mobile station does not need to take any action, that is, if the Action Code value 0x00 of the MOB_PAG-ADV message is continuously activated, the maximum number of transmissions of the MOB_PAG-ADV message without omitting the MAC address hash of the mobile station is determined. Negotiate when sending and receiving DREG-REQ and DREG-CMD messages. At this time, the parameters used for the DREG-REQ message and the DREG-CMD message are MAC hash Skip Threshold.

The base station must include the MAC address hash at least once before the number of times that the MAC address hash of the mobile station is omitted exceeds the MAC hash Skip Threshold. If the number of times the MAC address hash is omitted exceeds the MAC hash Skip Threshold, when the MOB_PAG-ADV message does not include the MAC address hash of the mobile station, the mobile station performs paging group-based location update. shall. In this case, fields included in the RNG-REQ message for location update by the mobile station are shown in Table 7 below.

Name Type Length Value MAC Hash Skip Threshold Location Update 8 One 0x00-0xFE: Initial value of the MAC Hash Skip Threshold Counter (refer to section 6.3.24.6) 0xFF: Ths BS shall omit the MS MAC Address hash in MOB_PAG-ADV messages and MS does not start MAC Hash Skip Counter. (sections 6.3.24.6 and 6.3.24.8.1.4)

Next, a method of performing a location update or network entry procedure as the mobile station does not receive a MOB_PAG-ADV message according to embodiments of the present invention will be described.

First embodiment

When the mobile station does not receive the MOB_PAG-ADV message during the paging listening interval of the corresponding paging cycle, it transmits an RNG-REQ message having a form as shown in Table 8 to the base station.

Name Type Length Value Ranging Purpose Indication 6 One Bit # 0: HO indication (when this bit is set to 1 in combination with other included information elements indicates the MS is currently attempting to HO or Network Re-entry from Idle Mode to the BS) Bit # 1: Location Update Request (when this bit is set to 1, it indicates MS action of Idle Mode Location Update Process) Bit # 2: Location Update Request due to Missing MOB_ PAG - ADV Bits 3 -7: Reserved

Bit # 2 in the Ranging Purpose Indication field of Table 8 is newly proposed by the present invention. That is, when the mobile station does not receive the MOB_PAG-ADV message during the paging listening interval, the mobile station includes a Ranging Purpose Indication field in which the Bit # 2 is set to 1 and transmits the RNG-REQ message to the base station. Here, the bit # 2 set to 1 means that the mobile station requests a location update to the base station because the mobile station has not received the MOB_PAG-ADV message. Accordingly, the base station should also respond to the location update request of the mobile station with a new RNG-RSP message. A field included in the TLV Encoded Information field of the new RNG-RSP message has a form as shown in Table 9 below.

Name Type Length Value Location Update Response 23 One 0x00 = Success of Location Update 0x01 = Failure of Location Update 0x02 = Reserved 0x03 = Success of location update and DL traffic pending 0x04 = Continue Network Entry Procedure 0x05 ~ 0xFF: Reserved

0x04 in the Location Update Response field of Table 9 is newly proposed in the present invention. If the base station transmits an RNG-RSP message to the mobile station by setting the Location Update Response field to 0x04, this means instructing the mobile station to perform a network entry procedure. In addition, if the base station transmits an RNG-RSP message to the mobile station by setting the Location Update Response field to 0x04, the base station transmits a MOB_PAG-ADV message including the MAC address hash value of the mobile station during the paging listening interval of the mobile station. It means that the transmission. On the contrary, if the base station transmits a MOB_PAG-ADV message that does not include the MAC address hash value of the mobile station, the base station sets the value of the Location Update Response to any one of 0x00 to 0x03 according to the situation of the mobile station and the base station. A RNG-RSP message set to a value is transmitted to the mobile station.

Second embodiment

In the second embodiment of the present invention, the mobile station counts the number of times it has not received the MOB_PAG-ADV message. If the counted value is equal to or greater than the preset reference count, the mobile station transmits an RNG-REQ message as described in the first embodiment. In the above, the number of times that the MOB_PAG-ADV message has not been received is compared with a preset reference count, but the mobile station decreases the reference count value by the number of times that the MOB_PAG-ADV message has not been received, and the reference count value is 0. If so, the RNG-REQ message as described in the first embodiment is transmitted.

Third embodiment

In the third embodiment of the present invention, when the mobile station does not receive the MOB_PAG-ADV message during its paging listening interval, the mobile station transmits an RNG-REQ message including a Ranging Purpose Indication field in which Bit # 1 is set to 1 to the base station. The base station transmits an RNG-RSP message having a Location Update Response field set to 0x03 to the mobile station when paging the mobile station, and sends a RNG-RSP message having a Location Update Response field set to 0x00 or 0x02 when the mobile station does not page the mobile station. Send by

When the mobile station receives an RNG-RSP message in which the Location Update Response field is set to 0x03 from the base station, it recognizes that there is downlink traffic to receive and needs to perform a location update, that is, a network re-entry procedure. . The ranging step of the network reentry procedure of the mobile station may be omitted. Meanwhile, in the third embodiment, as in the second embodiment, the mobile station may perform the location update in consideration of the number of times that the MOB_PAG-ADV message is not received and the reference count.

Fourth embodiment

In the fourth embodiment of the present invention, the mobile station transmits an RNG-REQ message having Bit # 2 set to 1 in the Ranging Purpose Indication field shown in Table 8 to the base station. When the base station receives the RNG-REQ message, the base station transmits an RNG-RSP message including the TLV encoded information of Table 5 to the mobile station. If the mobile station receives the RNG-RSP message whose action code is set to 0x03, it performs a new network entry procedure or a network reentry procedure in which the ranging process is omitted.

Fifth Embodiment

In the fifth embodiment of the present invention, the mobile station transmits a general RNG-REQ message for location update to the base station. When the base station receives the RNG-REQ message, the base station transmits the newly proposed RNG-RSP message to the mobile station. If the mobile station receives an RNG-RSP message having a Location Update Response value of 0x04, it performs a new network entry procedure or a network reentry procedure in which a ranging process is omitted.

Sixth embodiment

In the sixth embodiment of the present invention, a method of including a TLV field indicating that location update is performed when a MOB_PAG-ADV message is not received in a DREG-REQ message and a DREG-CMD message will be described.

For example, a mobile station that has not received a MOB_PAG-ADV message may not necessarily need to perform a location update. That is, when the base station transmits a MOB_PAG-ADV message for data transmission and reception that is not sensitive to service delay, the mobile station does not need to perform a location update when the MOB_PAG-ADV message is not received according to the present invention. This is because the base station can transmit the MOB_PAG-ADV message even in the next paging period.

Meanwhile, the base station may perform location update of the MOB_PAG-ADV message that has not been received for the mobile stations having high priority. Here, the high priority mobile stations may be mobile stations that use a communication fee more than a predetermined criterion or mobile stations requiring rapid paging.

Therefore, in the sixth embodiment of the present invention, a TLV Encoded Information field having a form as shown in Table 10 is included in a DREG-REQ message and a DREG-CMD message.

Name Type Length Value Preference of Location Update in case of missing MOB_PAG-ADV xx One 0x00 = perform no Location Update (default value) 0x01 = perform Location Update for missing MOB_PAG-ADV

If the mobile station sends a DREG-REQ message with the value of the TLV Encoded Information field shown in Table 10 to 0x01 to the base station, the base station knows that the mobile station will perform a location update if it does not receive the MOB_PAG-ADV message. .

In addition, when the mobile station receives a DREG-CMD message in which the value of the TLV Encoded Information field shown in Table 10 is 0x01 from the base station, the mobile station performs location update when the mobile station does not receive the MOB_PAG-ADV message.

On the other hand, if the mobile station transmits a DREG-REQ message with the value of the TLV Encoded Information field shown in Table 10 to 0x00 to the base station, the base station will not perform the location update if the mobile station does not receive the MOB_PAG-ADV message. You will know that

In addition, when the mobile station receives a DREG-CMD message in which the value of the TLV Encoded Information field shown in Table 10 is 0x00 from the base station, the mobile station does not need to perform a location update when the mobile station does not receive the MOB_PAG-ADV message. Do.

If the base station transmits a DREG-CMD message to the mobile station without receiving a DREG-REQ message, that is, transmits an Unsolicited DREG-CMD message to the mobile station, the mobile station operates according to the value of the TLV Encoded Information field of Table 10. Done.

Even if the DREG-REQ message and the DREG-CMD message include the TLV Encoded Information field of Table 10, the mobile station or the base station reconstructs the received RNG-RSP message and the RNG-REQ message, respectively. The operation can be changed according to the value of the TLV Encoded Information field. If the RNG-REQ message and the RNG-RSP message do not include the TLV Encoded Information field of Table 10, the operation of the mobile station and the base station is not changed. As described above, the DREG-REQ message and the DREG- When the TLV Encoded Information field of Table 10 is included in the CMD message, the base station can selectively control the mobile station to perform the location update according to the failure of the MOB_PAG-ADV message.

Meanwhile, the concept of the count value as described in the second embodiment may also be applied to the third to fifth embodiments.

2 is a diagram illustrating an operation of not receiving a MOB_PAG-ADV message of a mobile station according to an embodiment of the present invention.

2, the mobile station 203 transmits a DREG-REQ message 205 to the base station 201 for transition to the idle mode. The base station 201 transmits a DREG-CMD message 207 in response to the DREG-REQ message of the mobile station. Here, the DREG-CMD message is a message for accepting the transition of the mobile station 203 to the idle mode.

The mobile station 203 waits for the paging offset 209 and then enters the paging period 211. The predetermined time period of the paging period 211 corresponds to the paging listening interval 107. The mobile station 203 receives 215 a MOB_PAG-ADV message transmitted from the base station 201 during the paging listening interval 107. If the MOB_PAG-ADV message does not include the MAC address hash value of the mobile station 203, the mobile station 203 operates in idle mode.

The mobile station 203 then again receives a MOB_PAG-ADV message during the paging listening interval 215 of the next paging period 217 (219).

Meanwhile, as in the third paging period 221, the mobile station 203 may not receive the MOB_PAG-ADV message 225 from the base station 201 during the paging listening interval 223. In this case, the mobile station according to the first embodiment of the present invention transmits to the base station 201 an RNG-REQ message 227 in which Bit # 2 of the Ranging Purpose Indication field is set to one. When the base station 201 receives the RNG-REQ message, the base station 201 transmits a general RNG-RSP message or an RNG-RSP message including a field as shown in Table 9 of the present invention to the mobile station 203. Of course, the operation according to the MOB_PAG-ADV message not received by the mobile station 203 in FIG. 2 may be applied to various embodiments as described above.

3 is a flowchart illustrating a paging operation process of a mobile station according to an embodiment of the present invention.

Referring to FIG. 3, in step 302, the mobile station enters a paging listening interval and proceeds to step 304. In step 304, the mobile station determines whether a MOB_PAG-ADV message is received at the paging listening interval. If the MOB_PAG-ADV message is not received in the paging listening interval, the mobile station transmits an RNG-REQ message in which the Bit # 2 of the ranging purpose indication field, that is, the Ranging Purpose Indication field, is set to 1 in step 306. Send. On the other hand, upon receiving the MOB_PAG-ADV message in the paging listening interval, the mobile station compares the paging group identifier included in the MOB_PAG-ADV message with a previously recognized paging group identifier in step 308, so that the same paging group If no, the process proceeds to step 310 and, in the case of the same paging group, step 312.

In step 310, the mobile station performs a paging group based location update. On the other hand, in step 312, the mobile station determines whether its MAC address hash value is included in the MOB_PAG-ADV message. As a result of the determination, when the MOB_PAG-ADV message includes its own MAC address hash value, in step 314, the mobile station performs an operation corresponding to the action code value included in the MOB_PAG-ADV message. Otherwise, when the MOB_PAG-ADV message does not include its MAC address hash value, the mobile station operates in an idle mode in step 316.

4 is a flowchart illustrating a paging operation process of a base station according to an embodiment of the present invention.

Referring to FIG. 4, in step 402, the base station receives an RNG-REQ message from the mobile station and proceeds to step 404. In step 404, the base station determines whether a ranging purpose indication field is included in the RNG-REQ message. As a result of the determination, when the ranging purpose indication field is not included in the RNG-REQ message, the base station performs a separate operation corresponding to another purpose of the RNG-REQ message in step 406.

On the other hand, when the ranging purpose indication field is included in the RNG-REQ message, the base station determines whether Bit # 2 of the ranging purpose indication field is set to 1 in step 408. As a result of the determination, if Bit # 2 is not set to 1, in step 410, the base station performs an operation corresponding to the other bit in which the bit value is set to 1, that is, activated. If the Bit # 2 is set to 1, in step 412, the base station determines whether the mobile station has previously paged.

If the mobile station has previously paged, the base station sets the location update response field value to 0x04 in step 414 and proceeds to step 416. On the other hand, if the mobile station has not previously paged, the base station sets the location update response field value to 0x00 in step 416 and proceeds to step 418. In step 416, the base station may set the location update response field value to a value other than 0x00 and 0x04. In step 418, the base station transmits an RNG-RSP message including the location update response field to the mobile station.

In the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

1 illustrates a general paging procedure

2 is a diagram illustrating an operation of not receiving a MOB_PAG-ADV message of a mobile station according to an embodiment of the present invention.

3 is a flowchart illustrating a paging operation process of a mobile station according to an embodiment of the present invention.

4 is a flowchart illustrating a paging operation process of a base station according to an embodiment of the present invention.

Claims (22)

In a wireless communication system, in the operation method according to the mobile station not receiving the paging message, Determining whether the paging message is received from a base station at a paging listening interval, which is a time interval for receiving the paging message; If a paging message is not received until the paging listening interval expires, transmitting a ranging request message to the base station requesting a location update according to the non-paging message; And receiving a ranging response message from the base station. The method of claim 1, And the ranging response message is a message for instructing the mobile station to perform a network entry procedure. The method of claim 1, And performing a network reentry procedure in which a ranging procedure is omitted after receiving the ranging response message. The method of claim 1, wherein the transmitting of the ranging request message comprises: Counting the number of times of not receiving the paging message; And transmitting the ranging request message when the non-receive count value of the paging message is equal to or greater than a reference count value. The method of claim 1, wherein the transmitting of the ranging request message comprises: Counting the number of times of not receiving the paging message; Subtracting an unreceived count value of the paging message to a reference count value; And transmitting the ranging request message when the reference count value becomes 0 as a result of the subtraction. In a wireless communication system, in the operation method according to the mobile station not receiving the paging message, Determining whether the paging message is received from a base station at a paging listening interval, which is a time interval for receiving the paging message; If a paging message is not received until the paging listening interval expires, transmitting a ranging request message requesting a location update to the base station; And receiving a ranging response message from the base station. The method of claim 6, And the ranging response message is a message for instructing the mobile station to perform a network entry procedure. The method of claim 6, And performing a network reentry procedure in which a ranging procedure is omitted after receiving the ranging response message. The method of claim 6, wherein the transmitting of the ranging request message comprises: Counting the number of times of not receiving the paging message; And transmitting the ranging request message when the non-receive count value of the paging message is equal to or greater than a reference count value. The method of claim 6, wherein the transmitting of the ranging request message comprises: Counting the number of times of not receiving the paging message; Subtracting an unreceived count value of the paging message from a reference count value; And transmitting the ranging request message when the reference count value becomes 0 as a result of the subtraction. In the wireless communication system, in the operation method according to the transmission of the paging message of the base station, Transmitting the paging message to the mobile station at a paging listening interval, which is a time interval for receiving the paging message; Upon receiving a ranging request message from the mobile station, determining whether a ranging purpose indication field is included in the ranging request message; If the ranging request message includes a ranging purpose indication field, and the specific bit value of the ranging purpose indication field is set to a value for which the mobile station requires a location update according to the non-paging message, the ranging Determining whether the mobile station is paged before receiving the request message; And transmitting a ranging response message to the mobile station, the ranging response message including a location update response field instructing the mobile station to perform a network entry procedure if the mobile station is paged. The method of claim 11, If the mobile station is not paged before the ranging request message is received, the value of the location update response field indicates a value indicating a successful location update, a value indicating a location update failure, and a location update succeeded and there is downlink traffic. Setting to any one of values indicating that And transmitting the ranging response message including the set value to the mobile station. In a wireless communication system, Including a mobile station and a base station, The mobile station determines whether the paging message is received from the base station at a paging listening interval, which is a time interval for receiving a paging message, and if the paging listening interval does not receive a paging message until the paging listening interval expires, Transmitting a ranging request message requesting a location update according to a non-paging message to a base station, receiving a ranging response message from the base station, The base station transmits a paging message to the mobile station, and upon receiving a ranging request message requesting a location update according to the non-paging message received from the mobile station, transmits a ranging response message to the mobile station. . The method of claim 13, And when the mobile station receives the ranging response message, the mobile station performs a network entry procedure. The method of claim 13, And when the mobile station receives the ranging response message, the mobile station performs a network reentry procedure that omits the ranging procedure. The method of claim 13, And the mobile station counts the number of times of not receiving the paging message, and transmits the ranging request message to the base station when the number of unreceived count values of the paging message is equal to or greater than a reference count value. The method of claim 13, The mobile station counts the number of times it has not received the paging message, subtracts the unreceived count value of the paging message from the reference count value, and if the reference count value is zero, transmits the ranging request message to the base station. Wireless communication system characterized in that. In a wireless communication system, in the operation method according to the mobile station not receiving the paging message, Transmitting a message to the base station including a field indicating whether to perform a location update when the paging message is not received in the first message used for the idle mode transition request; Receiving, from the base station, a second message which is a response message to an idle mode transition request including a field for performing a location update when no paging message is received; Determining whether the paging message is received from a base station at a paging listening interval, which is a time interval for receiving the paging message; And if a paging message is not received until the paging listening interval expires, performing a location update. The method of claim 18, The first message is a deregistration request (DREG-REQ) message, and the second message is a deregistration response (DREG-RSP) message. In a wireless communication system, a method for transmitting a paging message of a base station, Transmitting a first message to the mobile station, the first message in response to an idle mode transition request including a field to perform a location update when no paging message is received; Transmitting a paging message to the mobile station. The method of claim 20, wherein Receiving a second message from the mobile station, the second message being used for an idle mode transition request including a field indicating whether to perform a location update when the paging message is not received from the mobile station before transmitting the first message; And recognizing that a value of a field included in the second message is a value indicating that the mobile station will perform a location update when a paging message is not received. The method of claim 20, The first message is a registration deregistration response (DREG-RSP) message, and the second message is a registration deregistration request (DREG-REQ) message.

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