KR20100091091A - Method of receiving a paging message - Google Patents

Abstract

PURPOSE: A method for receiving a paging message is provided to definitely transmit time when a paging message is transmitted to a mobile terminal to enable the mobile terminal to receive a paging message at only the time, thereby reducing power consumption and overhead to monitor the paging message. CONSTITUTION: A mobile terminal transmits a registration release request message to a base station(S301). The mobile terminal receives a registration release instruction message from the base station(S303). The registration release instruction message includes a paging message offset showing a transmission frame of a paging message. The mobile terminal enters into an idle mode. The mobile terminal receives the paging message from a frame showing the paging message offset(S305).

Description

Method of receiving a paging message

The present invention relates to an idle mode operation method in a wireless access system.

Hereinafter, an idle mode of a paging group and a terminal related to embodiments of the present invention will be briefly described.

1 is a diagram illustrating an example of a paging group consisting of a plurality of base stations.

Paging refers to a function of identifying the location (eg, which base station or which switching station is present) of a mobile station (MS) when an incoming call occurs in mobile communication. As illustrated in FIG. 1, a plurality of base stations (BSs) supporting an idle mode may belong to a paging group to configure a paging area.

At this time, the paging group represents a logical group. The purpose of a paging group is to provide a contiguous area that can be paged downlink (DL) if there is traffic targeted to the mobile station (MS). The paging group is preferably large enough so that a specific terminal can exist for most of the time in the same paging group, and satisfies the condition that the paging load should be small enough to maintain an appropriate level.

1 shows four paging groups defined on multiple base stations located in a hexagonal grid. One base station may be included in one or more paging groups. Paging groups are defined in the management system. Paging groups can use paging group-action backbone network messages. In addition, the paging controller may manage a list of UEs in idle mode by using a paging-announce message, which is one of the backbone network messages, and manage initial paging of all base stations belonging to the paging group.

In idle mode, when a mobile station moves in a wireless link environment composed of multiple base stations, it is possible to periodically receive downlink (DL) broadcast traffic even without registering to a specific base station. Say

Idle mode can benefit the mobile station by eliminating active and general operational requirements associated with handover. Idle mode can limit the terminal activity to scan in discrete periods, thereby saving power and operating resources used by the terminal.

In addition, the idle mode provides a simple and proper way to inform the terminal of downlink traffic pending, and removes the air interface and network handover (HO) traffic from inactive terminals. And base stations can benefit.

Paging in idle mode is performed on a paging group basis. Referring to FIG. 1, a mobile terminal may belong to one or more paging groups, and a paging controller (PC) of each paging group may search for a mobile terminal when a user packet comes from a call or an external network. Perform (Paging). At this time, the paging controller delivers the paging message to all base stations in the paging group, and the base station receiving the paging message performs paging by broadcasting a MOB_PAG-ADV message to the mobile terminal.

When the mobile station enters idle mode, the mobile station uses the paging information of the MOB_DREG-CMD message received from the serving base station to check whether there is a paging message delivered to the wireless channel during the paging listening period. Can be monitored.

When the paging controller (PC) receives a call or packet to be transmitted to the mobile station from the outside, the paging controller transmits a paging message to all base stations in the paging group to find the mobile station. In this case, all mobile terminals in the paging group may monitor the radio channel by operating the receiver during a paging listening period (frame unit) to check whether there is a paging message received from the mobile terminal.

In this case, since the mobile station must continuously monitor whether there is a paging message in the paging listening period, the power consumption may be excessive and the overhead of continuously monitoring the radio channel may occur. In addition, since the paging listening period is repeated every paging period, the power consumption and overhead of the mobile terminal can be further increased.

In addition, the idle mode mobile station checks a paging group identifier (PGID) of the base station through a downlink channel descriptor (DCD) message or a superframe header (SFH) transmitted by the base station. If the paging group identifier allocated to the idle mode and the PGID received through the DCD message or the SFH are different, the mobile station performs location update with the current base station. However, in this case, since the PGID is always included in the DCD message, the overhead of the DCD message or SFH may increase.

The present invention has been made to solve the problems of the general technology as described above, an object of the present invention is to provide an efficient idle mode operation method.

Another object of the present invention is to provide an idle mode operation method that can reduce power consumption and overhead of a mobile terminal by providing a method for notifying a mobile terminal of a paging message offset.

Another object of the present invention is to provide an efficient idle mode operation method that can be applied to the superframe structure used in the IEEE 802.16m system.

It is still another object of the present invention to provide a method of reducing the overhead of a DCD message or SFH by using a paging message offset.

Technical objects to be achieved in the present invention are not limited to the above-mentioned matters, and other technical problems which are not mentioned are those skilled in the art from the embodiments of the present invention to be described below. Can be clearly derived and understood.

In order to solve the above technical problem, the present invention relates to an idle mode operation method in a wireless access system discloses various methods for efficiently transmitting and receiving a paging message.

In one aspect of the present invention, a method for receiving a paging message in a wireless access system includes transmitting a deregistration request message to a base station to enter an idle mode, and a paging message offset indicating a frame in which a paging message is transmitted from the base station. The method may include receiving a deregistration command message including a step of entering a mobile terminal into an idle mode and receiving a paging message in a frame indicated by a paging message offset in a paging listening interval. In this case, the mobile station may perform micro sleep in the paging listening section except for the frame indicated by the paging message offset.

In one aspect of the present invention, the deregistration command message may include a paging paging period field indicating a period in which a paging message is transmitted in an idle mode, a paging offset field indicating a start time of a paging listening period in a paging period, and a length of a paging listening period. It may further include one or more of a paging listening interval field indicating and a paging group identifier indicating a paging group assigned to the mobile station.

In an aspect of the present invention, the base station belongs to one or more paging groups, and the paging message offset may be assigned to each of the one or more paging groups. In this case, the paging message is preferably transmitted only in the frame indicated by the paging message offset for each paging group.

In another aspect of the present invention, a method for receiving a paging message in a wireless access system includes: transmitting a deregistration request message to a base station to enter an idle mode, and a paging message indicating when a paging message is transmitted from the base station; Receiving a deregistration command message including an offset, entering a mobile terminal into an idle mode, and receiving a superframe header including a paging indication bitmap in a paging listening interval. . At this time, the mobile station receives a paging message if the paging instruction bitmap is set (for example, set to '1') in the frame included in the paging listening interval indicated by the paging message offset, and the paging instruction bitmap is set. If not set (for example, set to '0'), Idle mode can be entered.

In another aspect of the present invention, the mobile station may perform micro sleep in the remaining frames except for the frame indicated by the paging message offset in the paging listening interval in the idle mode.

In another aspect of the present invention, the deregistration command message may include a paging paging period field indicating a period for transmitting a paging message in an idle mode, a paging offset field indicating a start time of a paging listening period in a paging period, and a length of a paging listening period. It may further include one or more of a paging listening interval field indicating and a paging group identifier indicating a paging group assigned to the mobile station.

In another aspect of the present invention, the superframe header may further include a flag indicating whether a paging indication bitmap is used.

In another aspect of the present invention, a method for receiving a paging message in a wireless access system includes: transmitting a deregistration request message to a first base station by a mobile terminal to enter an idle mode; Receiving a deregistration command message including a first paging group identifier (PGID) indicating a paging group to which it belongs and a paging message offset indicating a frame in which a paging message is transmitted and the mobile station listening to idle mode paging from a second base station; And receiving a second paging group identifier in a frame indicated by the paging message offset in the interval. In this case, when the first paging group identifier and the second paging group identifier are different from each other, the mobile station preferably performs location update at the second base station.

In another aspect of the present invention, if the first paging group identifier and the second paging group identifier are the same, the mobile station can further receive a paging message in the frame indicated by the paging message offset.

In another aspect of the present invention, the mobile station can perform micro sleep in the paging listening section except for the frame indicated by the paging message offset.

In another aspect of the present invention, the deregistration command message may include a paging paging period field indicating a period for transmitting a paging message in an idle mode, a paging offset field indicating a start time of a paging listening period in a paging period, and a length of a paging listening period. It may further include one or more of a paging listening interval field indicating a paging group identifier indicating a paging group allocated to the mobile station.

In the embodiments of the present invention, the frame indicated by the paging message offset may be a subframe.

According to the embodiments of the present invention, the following effects are obtained.

First, by using the methods described in the embodiments of the present invention, the mobile station and the base station can efficiently perform the idle mode operation.

Second, the base station explicitly informs the mobile station of the paging message offset (paging message offset) and the mobile terminal wakes up only at that time and receives the paging message, so that the mobile station consumes power and overhead for monitoring the paging message. Can be reduced.

Third, the embodiments of the present invention can be applied to the superframe structure of the IEEE 802.16m system, which is one of advanced wireless access technologies, thereby providing an efficient idle mode operation method for a user.

Fourth, by transmitting the paging message and / or PGID in the frame or subframe indicated by the paging message offset, it is possible to reduce the overhead of the DCD message or SFH.

Effects obtained in the embodiments of the present invention are not limited to the above-mentioned effects, and other effects not mentioned above are usually described in the technical field to which the present invention pertains from the description of the embodiments of the present invention. Can be clearly derived and understood by those who have

The present invention relates to an idle mode operation method in a wireless access system and discloses various methods for efficiently transmitting and receiving a paging message. In addition, the present invention discloses methods for reducing paging overhead of a mobile station by explicitly or implicitly indicating when a paging message is transmitted to the mobile station.

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or feature may be considered to be optional unless otherwise stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

In the description of the drawings, procedures or steps which may obscure the gist of the present invention are not described, and procedures or steps that can be understood by those skilled in the art are not described.

In the present specification, embodiments of the present invention have been described based on data transmission / reception relations between a base station and a mobile station. Here, the base station is meant as a terminal node of a network that directly communicates with a mobile station. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.

That is, various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station. In this case, the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an advanced base station (ABS), or an access point. In addition, a 'mobile station' may be a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), a mobile terminal, an advanced mobile station (AMS), or It may be replaced with terms such as terminal.

Also, the transmitting end refers to a fixed and / or mobile node providing data service or voice service, and the receiving end means a fixed and / or mobile node receiving data service or voice service. Therefore, in uplink, a mobile station may be a transmitting end and a base station may be a receiving end. Similarly, in downlink, a mobile station may be a receiving end and a base station may be a transmitting end.

On the other hand, the mobile station according to the present invention personal digital assistant (PDA), cellular phone, personal communication service (PCS) phone, Global System for Mobile (GSM) phone, wideband CDMA (WCDMA) phone, MBS A Mobile Broadband System phone, a hand-held PC, a notebook PC, a smart phone, or a Multi Mode-Multi Band (MM-MB) terminal may be used.

Here, a smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and may mean a terminal incorporating data communication functions such as schedule management, fax transmission and reception, which are functions of a personal mobile terminal, in a mobile communication terminal. have. In addition, a multimode multiband terminal has a built-in multi-modem chip to operate in both portable Internet systems and other mobile communication systems (e.g., code division multiple access (CDMA) 2000 systems, wideband CDMA (WCDMA) systems, etc.). Can speak terminal.

Embodiments of the invention may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For a hardware implementation, the method according to embodiments of the present invention may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in this document may be described by the above standard document. In particular, embodiments of the present invention may be supported by one or more of the standard documents P802.16-2004, P802.16e-2005, and P802.16Rev2 documents of the IEEE 802.16 system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced.

In addition, specific terms used in the embodiments of the present invention are provided to help the understanding of the present invention, and the use of the specific terms may be changed into other forms without departing from the technical spirit of the present invention. .

2 is a diagram illustrating one of paging procedures used in a wireless access system.

The mobile station can transmit a deregistration request (DREG-REQ) message including paging information related to the mobile station to the serving base station to enter the idle mode (S201).

The serving base station may transmit a deregistration command (DREG-CMD) message including paging information related to the serving base station to the mobile station in order to allow the mobile station to enter the idle mode (S202).

In step S202, the serving base station includes a paging information field in the DREG-CMD message and transmits it to the terminal. The paging information field may include a paging cycle, a paging offset, a paging group identifier (PGID), a paging listening interval (Paging Listening Interval) value, and the like.

The mobile terminal receiving the deregistration command message may enter the idle mode with reference to the paging information. The idle mode has a paging cycle, and one paging cycle may be composed of an available interval and an unavailable interval. In this case, the operable period is the same concept as the paging listening period. The paging offset represents a frame in which a paging period starts within a paging period. In addition, the paging paging group identifier indicates the identifier of the paging group assigned to the mobile station.

The mobile terminal can receive the paging message delivered to the mobile station in the operable period (that is, paging listening interval) using the paging information. The mobile station monitors the radio channel during the paging period to receive the paging message. In this case, the operable period may be a minimum of one frame to a maximum of five frame periods. One OFDMA frame may have a size of 5 ms. That is, the mobile station can continuously monitor the radio channel for at least one frame and up to five frames (preferably two, three or four frames) to receive the paging message.

One. Paging  With message offset Paging  How to send a message

3 is a diagram illustrating a method of transmitting and receiving a paging message using a paging message offset as one embodiment of the present invention.

Referring to FIG. 3, a mobile station (MS) may transmit a MOB_DREG-REQ message to a serving base station in order to enter idle mode (S301).

Table 1 below shows an example of a Deregistration Request (MOB_DREG-REQ) message format that can be used in embodiments of the present invention.

Syntex Size (bit) Note MOB_DREG-REQ Message_format () { Management Message type = 49 De-registration_requst_code 0x00 = SS deregistration reqeust from BS and network
0x01 = Request for MS deregistration from serving BS and initiation of MS idle mode
0x02 = Response for the unsolicited MS deregistration initiated by the BS
0x03 = Reject for the unsolicited DREG-CMD with action code 0x05 (idle mode request) by the BS. This code is applicable only when MS has a pending UL data to transmit.
0x04-0xFF = reserved TLV-encoded parameters Paging Information ~  } // end of MOB_DREG-REQ

Referring to Table 1, the MOB_DREG-REQ message may include a management message type field, a deregistration request code field, and a TLV encoding parameter field. The management message type field indicates what message is the corresponding message, and the deregistration request code field indicates whether the deregistration request message is used. If the deregistration request code field is set to 0x01, the deregistration request message may further include a paging cycle request parameter and an idle mode maintenance information parameter.

Optionally, the mobile station may further include paging information in the deregistration request message to transmit to the serving base station. The paging information may include a paging period, a paging offset, a paging listening interval, and a paging message offset field requested by the mobile terminal (i.e., accepted by the mobile terminal). In this case, when the paging message offset field is included in the deregistration request message, the base station can recognize that the mobile station can receive a paging message at a specific location.

The serving base station receiving the deregistration request message from the mobile station can transmit a deregistration command (MOB_DREG-CMD) message including a paging message offset field (S303).

Table 2 below shows an example of an unregister command (MOB_DREG-CMD) message format that can be used in embodiments of the present invention.

Syntex Size (bit) Note MOB_DREG-REQ Message_format () { - -  Management Message Type = 29  Action code  TLV encoded parameters  Paging Information {   Paging Cycle   Paging Offset   Paging Listening Interval   The number of paging group ID Number of paging groups to which the base station belongs   For (i = 0; i <the number of paging group ID; i ++) {     Paging Message Offset Indicates a frame or subframe through which paging message is delivered    } // end of For ()   } // end of paging information ~  } // end of MOB_DREG-REQ

Referring to Table 2, the MOB_DREG-CMD message includes a Management Message Type field, an Action Code field, a TLV encoded parameter field, and paging information. One or more of the fields may be included. Optionally, the deregistration command message may further include a paging controller identifier field and an idle mode retain information field in the deregistration command message.

Further, the paging information field in Table 2, a paging cycle (Paging Cycle), paging offset, which is the field, the paging intervals in the paging period (eg paging listening interval) frame to the start (Paging Offset) field, a paging listening interval that indicates the length of the paging listening interval (Paging Listening Interval) field, a paging group identifier number (The Number of paging group ID indicating the number of the paging group of which the base station) field, and each paging group or predetermined criteria for grouping Paging message offset, which offset is a paging message for the mobile terminal transfer (Paging Message Offset ) field may be included. At this time, the paging message offset field (N _{paging) frame} ) may indicate a location on which a paging message is transmitted in a specific frame or subframe unit.

The base station may transmit a paging message for each frame or subframe for each paging group. Accordingly, the base station may allocate a paging message offset on a paging group basis (e.g. PGID A, PGID B, PGID C). However, when the base station belongs to one or more paging groups, the base station may bundle a predetermined number of paging groups and allocate a paging message offset. For example, the base station may allocate a paging message offset such that the base station transmits a paging message to mobile terminals belonging to the paging groups A and B together.

Referring to FIG. 3 again, the mobile terminal receiving the DREG-CMD message enters idle mode. In addition, the mobile station may perform an idle mode operation according to the paging information field. However, according to an embodiment of the present invention, even when the mobile terminal is in an operable period, the mobile terminal can wake up and receive a paging message only in the frame or subframe indicated by the paging message offset field.

That is, the mobile station belonging to paging group A (eg PGID A) wakes up in the second frame indicated by the paging message offset field and receives the paging message, and the mobile station belonging to paging group B (eg PGID B) receives the paging message offset field. Wake up in the third frame indicated by the paging message, and the mobile station belonging to the paging group C (eg PGID C) may wake up in the fourth frame indicated by the paging message offset field can receive the paging message.

A mobile station belonging to each paging group may wake up only in a frame or subframe indicated by the paging message offset for the group, decode the paging message, and perform the micro sleep in which the remaining paging listening period is operated in the sleep mode again.

4 is a diagram illustrating a state in which a mobile terminal performs a micro sleep operation according to an embodiment of the present invention.

4 illustrates an operation after the mobile station checks the paging message offset by receiving the DREG-CMD message in step S303 of FIG. By checking the paging message offset, the mobile station can wake up only at its paging offset and receive the paging message despite the available interval.

That is, the mobile station can reduce power consumption by performing micro sleep during the A period of FIG. 4 and wake up in the third frame indicated by the paging message offset to decode the paging message. In addition, the mobile station may perform micro sleep in the paging listening section remaining again after receiving the paging message.

If the paging message offset is not used, the mobile station must monitor the radio channel to continuously receive the paging message from the frame or subframe indicated by the paging offset to the operation interval indicated by the paging listening interval field.

The method of sending the paging message to the mobile terminal using the paging message offset has another advantage. For example, it is possible to reduce the length of the paging group identifier. In the commonly used IEEE 802.16e standard, a paging group identifier is represented using 16 bits, and a paging message is generated by a paging group unit and transmitted to a mobile station. However, in the embodiments of the present invention, there is an effect of reducing the length of the paging group identifier by transmitting the paging message by further dividing the paging segment by one step from the paging group unit.

In addition, embodiments of the present invention by distributing the time when the paging message is transmitted, the mobile terminal wakes up in the operating interval, the mobile terminal receives a paging message and performs the ranging at the same time as the collision between the mobile terminal to solve the problem Can be reduced somewhat.

5 is a diagram illustrating an allocation structure of a paging identifier information element according to another embodiment of the present invention.

In another embodiment of the present invention, the mobile station (AMS) explicitly states the paging message offset (N _paging ) at the start of the idle mode. _frame ) can be allocated. In addition, the mobile terminal AMS may monitor a paging indication bitmap included in a superframe header (SFH) during a paging listening period.

If the paging instruction bitmap is set, the mobile station can decode all paging messages continuously at the paging message offset allocated at the start of the initial idle mode. You can return to the period.

The mobile station AMS may be assigned a paging offset, a paging listening period, a paging message offset, and a paging group identifier through a deregistration command (DREG-CMD) message when entering idle mode. In this case, the paging period may be set in units of superframes.

The mobile station can decode a superframe header (SFH) transmitted every superframe in its paging listening period. In this case, the SFH may include a primary SFH and a secondary SFH. The mobile terminal can decode the PGID information element included in the secondary SFH (e.g. S-SFH SP5).

In addition, the mobile terminal can obtain a paging indication bitmap included in the PGID information element. The mobile station can know whether there is a paging message delivered to it through the paging indication bitmap.

For example, when the paging message offset allocated through the DREG-CMD message indicates the third frame in the corresponding superframe, the mobile station checks the third bit of the paging indication bitmap and is set to '1'. Recognizing that there is a paging message delivered to it, it can decode the paging message transmitted in the third frame of the superframe.

Table 3 below shows an example of a PGID Information Element format.

Field Size (bits) Notes PGID Information Element () {  Number of PGIDs 3  Paging Indication usage flag One 0: Paging indication bitmap is not included.
1: Paging indication bitmap is included.  For (i = 0; i <Number of PGIDs; i ++) {   PGID TBD  }  If (Paging indicator usage flag == 1) {   Paging Indication Bitmap 4 * Number of PGIDs  } }

Referring to Table 3, the PGID information element includes a PGID number field indicating the number of paging groups to which the base station (ABS) belongs, a paging indication usage flag indicating whether a paging message bitmap is used, and a base station (ABS). ) May include one or more of a paging group identifier (PGID) and a paging indication bitmap.

In this case, when the paging indication usage flag is set to '1', the base station may transmit a paging indication bitmap indicating the presence of a paging message corresponding to the paging identifier. That is, when the paging indication usage flag is set to '1', the paging indication bitmap may be included in the PGID information element and transmitted. If the paging indication usage flag is set to '0', this indicates that the pGID information element does not include the paging indication bitmap.

If the paging indication usage flag is set to '1', the mobile station may monitor the paging indication bitmap included in the SFH during the paging listening interval. If a bit of the paging indication bitmap is set to '1', the mobile station can continuously decode the entire paging message in the frame.

2. Paging Group Identifier ( PGID ) Transmission and location update method

As another embodiment of the present invention, a PGID transmission method and a location update method will be described. In another embodiment of the present invention, a method of performing location update by a mobile station on the assumption that the base station does not transmit the PGID through the superframe header will be described.

FIG. 6 is a diagram illustrating one of methods for transmitting a PGID and a paging message according to another embodiment of the present invention.

Referring to FIG. 6, the mobile station can transmit a deregistration request message to the base station in order to enter the idle mode. At this time, the deregistration request message may use the message described in Table 1 (S601).

The base station may transmit a deregistration command message to the mobile terminal in response to the deregistration request message. At this time, the deregistration response message may use the message described in Table 2 (S603).

The mobile terminal receiving the deregistration command message may transition to the idle mode and perform an idle mode operation by using parameters included in the paging information. That is, the mobile station may start a paging cycle from the time indicated by the paging offset, and monitor the radio channel to receive the paging message at the time indicated by the paging message offset. In addition, the base station may transmit a paging message to the mobile station in the frame or subframe indicated by the paging message offset (S605).

The paging message offset in step S605 indicates that the paging message and the PGID are transmitted in the second downlink subframe of the second frame of the corresponding superframe. Accordingly, the mobile station can decode the PGID and the paging message in the second downlink subframe of the second frame of the superframe.

In another embodiment of the present invention, since it is assumed that the SFH does not include a paging identifier (PGID), the base station should always transmit a paging group identifier at the paging message offset so that the mobile station can identify the paging group to which the base station belongs. do. Therefore, even if the paging controller does not deliver a paging announcement for searching for the mobile station to the base station, the base station should always broadcast a paging identifier (PG ID) in the frame or subframe indicated by the paging message offset.

The idle mode mobile station may check the PGID transmitted at the paging message offset and perform location update with the current base station when the PGID owned by the mobile station is different from the PGID transmitted by the current base station (not shown).

As another embodiment of the present invention, a mobile terminal and a base station in which the embodiments of the present invention described in FIGS. 2 to 6 can be performed will be described.

The mobile terminal may operate as a transmitter in uplink and as a receiver in downlink. In addition, the base station may operate as a receiver in the uplink, and may operate as a transmitter in the downlink. That is, the mobile terminal and the base station may include a transmitter and a receiver for transmitting information or data.

The transmitter and receiver may include a processor, module, part, and / or means for carrying out the embodiments of the present invention. In particular, the transmitter and receiver may include a module (means) for encrypting the message, a module for interpreting the encrypted message, an antenna for transmitting and receiving the message, and the like.

The mobile terminal used in the embodiments of the present invention may include a low power radio frequency (RF) / intermediate frequency (IF) module. In addition, the mobile terminal is a controller function for performing the above-described embodiments of the present invention, a medium access control (MAC) frame variable control function, a handover function, authentication and encryption function according to service characteristics and propagation environment, Means, modules or parts for performing packet modulation and demodulation functions, high speed packet channel coding functions, and real-time modem control functions for data transmission.

The base station may transmit data received from the upper layer to the mobile terminal wirelessly or wired. The base station may include a low power radio frequency (RF) / intermediate frequency (IF) module. In addition, the base station is a controller function for performing the above-described embodiments of the present invention, orthogonal frequency division multiple access (OFDMA) packet scheduling, time division duplex (TDD) packet scheduling and channel multiplexing function MAC frame variable control function according to service characteristics and propagation environment, high speed traffic real time control function, hand over function, authentication and encryption function, packet modulation and demodulation function for data transmission, high speed packet channel coding function and real time modem control Means, modules or parts for performing functions and the like.

The invention can be embodied in other specific forms without departing from the spirit and essential features of the 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. In addition, the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship or may be incorporated as new claims by post-application correction.

Embodiments of the present invention can be applied to various wireless access systems. Examples of various radio access systems include 3rd Generation Partnership Project (3GPP), 3GPP2 and / or IEEE 802.xx (Institute of Electrical and Electronic Engineers 802) systems. Embodiments of the present invention can be applied not only to the various radio access systems, but also to all technical fields to which the various radio access systems are applied.

1 is a diagram illustrating an example of a paging group consisting of a plurality of base stations.

2 is a diagram illustrating one of paging procedures used in a wireless access system.

3 is a diagram illustrating a method of transmitting a paging message using a paging message offset as one embodiment of the present invention.

4 is a diagram illustrating a state in which a mobile terminal performs a micro sleep operation according to an embodiment of the present invention.

5 is a diagram illustrating an allocation structure of a paging identifier information element according to another embodiment of the present invention.

FIG. 6 is a diagram illustrating one of methods for transmitting a PGID and a paging message according to another embodiment of the present invention.

Claims (14)

In the method for receiving a paging message in a wireless access system, Transmitting, by the mobile station, a deregistration request message to the base station to enter the idle mode; Receiving a deregistration command message including a paging message offset indicating a frame from which the paging message is transmitted; Entering, by the mobile terminal, the idle mode; And Receiving, by the idle mode mobile terminal, the paging message in a frame indicated by the paging message offset in a paging listening interval; And the mobile station performs micro sleep in the paging listening section except for the frame indicated by the paging message offset. The method of claim 1, The deregistration command message is A paging paging period field indicating a period during which the paging message is transmitted in the idle mode, a paging offset field indicating a start time of the paging listening period in the paging period, a paging listening period field indicating the length of the paging listening period, and the movement And at least one of a paging group identifier indicating a paging group allocated to the terminal. 3. The method of claim 2, And the frame indicated by the paging message offset is a subframe. 3. The method of claim 2, The base station belongs to one or more paging groups, And the paging message offsets are allocated for each of the one or more paging groups. The method of claim 4, wherein And the paging message is transmitted only in a frame indicated by the paging message offset for each paging group. In the method for receiving a paging message in a wireless access system, Transmitting, by the mobile station, a deregistration request message to the base station to enter the idle mode; Receiving a deregistration command message including a paging message offset indicating a time point at which the paging message is transmitted from the base station; Entering, by the mobile terminal, the idle mode; And The mobile station includes receiving a superframe header including a paging indication bitmap in a paging listening interval, The mobile station receives the paging message if the paging instruction bitmap is set in a frame included in the paging listening interval indicated by the paging message offset, and enters the idle mode if the paging instruction bitmap is not set. Method for receiving a paging message, characterized in that entering. The method of claim 6, The mobile station performs a micro sleep in a frame other than the frame indicated by the paging message offset in the paging listening interval of the idle mode. The method of claim 6, The deregistration command message is A paging paging period field indicating a period during which the paging message is transmitted in the idle mode, a paging offset field indicating a start time of the paging listening period in the paging period, a paging listening period field indicating the length of the paging listening period, and the movement And at least one of a paging group identifier indicating a paging group allocated to the terminal. The method of claim 8, And the frame indicated by the paging message offset is a subframe. The method of claim 6, The superframe header further includes a flag indicating whether the paging indication bitmap is used. In the method for receiving a paging message in a wireless access system, Transmitting, by the mobile terminal, a deregistration request message to the first base station to enter the idle mode; Receiving, from the first base station, a deregistration command message including a first paging group identifier (PGID) indicating a paging group to which the first base station belongs and a paging message offset indicating a frame in which the paging message is transmitted; And The mobile station receiving a second paging group identifier from a second base station in a frame indicated by the paging message offset in a paging listening interval of the idle mode; And if the first paging group identifier and the second paging group identifier are different from each other, the mobile station performs location update at the second base station. The method of claim 11, And if the first paging group identifier and the second paging group identifier are the same, the mobile station further receives the paging message in a frame indicated by the paging message offset. The method of claim 11, And the mobile station performs micro sleep in the paging listening section except for the frame indicated by the paging message offset. The method of claim 11, The deregistration command message is A paging paging period field indicating a period during which the paging message is transmitted in the idle mode, a paging offset field indicating a start time of the paging listening period in the paging period, a paging listening period field indicating the length of the paging listening period, and the movement And at least one of a paging group identifier indicating a paging group allocated to the terminal.

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