KR20100116108A - Method and apparatus of performing idle mode operation using mobility information - Google Patents

Abstract

The present invention discloses a location update method based on mobility information indicating a moving speed of a mobile terminal in a wireless access system, and a method and apparatus using a timer for location update. According to a first embodiment of the present invention, a method in which a mobile terminal to which one or more paging groups are allocated performs an idle mode operation may include a second paging in a first paging group (PPG) region of a mobile terminal in idle mode. Moving to a Group Paging Group (SPF), a ranging request message including a step of operating a paging group location update timer (PG_LU Timer) and a mobility information indicating the speed of the mobile terminal when the paging group location update timer expires. The method may include transmitting to a serving base station and receiving a ranging response message including new paging group information determined based on mobility information.

Description

Method and apparatus for performing idle mode operation using mobility information {Method and Apparatus of performing idle mode operation using mobility information}

The present invention relates to the operation of an idle mode mobile terminal in a wireless access system.

Hereinafter, a brief description will be given of a paging group used in an idle mode and an idle mode of a mobile terminal in relation to embodiments of the present invention.

In idle mode, when a mobile station moves in a radio link environment composed of multiple base stations, an operation for supporting downlink (DL) broadcast traffic transmission can be performed periodically 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 constrain mobile terminal activity to scan in discrete cycles, thereby saving power and operating resources used by the mobile terminal.

In addition, the idle mode provides a simple and reasonable way to inform the mobile station of pending downlink traffic, and eliminates radio interface and network handover (HO) traffic from inactive terminals. This can benefit the network and the base station.

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 a location (eg, any base station or a switching station) 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 to allow a particular terminal to 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 mobile terminals 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.

An object of the present invention is to support efficient idle mode operation for a mobile station and a base station.

It is another object of the present invention to provide a method and apparatus for reducing the number of location updates excessively performed by an idle mode mobile terminal.

It is still another object of the present invention to provide a method and apparatus for reducing the overhead of a paging message transmitted by a base station.

Another object of the present invention is to provide a method for determining a paging group allocated to a mobile terminal based on the mobility information of the mobile terminal.

It is still another object of the present invention to provide a method and apparatus for defining a paging group location update timer (PG_LU timer) and performing location update using the PG_LU timer using mobility information of a mobile terminal.

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 considered.

In order to solve the above technical problem, the present invention relates to an operation of an idle mode mobile terminal in a wireless access system, and a method and apparatus for using a location update method and a timer for updating location based on mobility information indicating a moving speed of the mobile terminal. It is about.

According to a first embodiment of the present invention, a method in which a mobile terminal to which one or more paging groups are assigned performs an idle mode operation may include: a primary paging group (PPG) region of a mobile terminal in an idle mode; Moving from the second paging group area (SPF) to a second paging group area (SPF), a step of operating a paging group location update timer (PG_LU Timer) and a lane including mobility information indicating the speed of the mobile terminal when the paging group location update timer expires. And transmitting a ranging request message to the serving base station and receiving a ranging response message including new paging group information determined based on mobility information. In this case, the mobility information may indicate one of 'Fast', 'Medium' and 'Slow'. Of course, the mobility information may indicate an absolute speed value of the current mobile terminal or an average speed value at a specific time.

In the first embodiment, the ranging response message may further include new paging group location update timer information determined based on mobility information.

According to the first embodiment, the mobile station has a first paging group identifier (Primary Paging Group IDentifier) and a first paging offset of the first paging group assigned to the mobile station from the serving base station, the second paging group identifier of the second paging group ( The method may further include receiving a deregistration command (DREG-CMD) message including paging group (PG) information including a secondary paging group IDentifier) and a second paging offset.

In addition, the first embodiment may further include the mobile terminal monitoring the paging message at the first paging offset. However, if the mobile station does not receive a paging message at the first paging offset, the first embodiment may further include monitoring the paging message at the second paging offset.

According to a second embodiment of the present invention, a method in which a mobile station to which one or more paging groups are allocated performs an idle mode operation may include a DREG-REQ message requesting the mobile terminal to enter idle mode. Transmitting to a first base station (first AMS) and a first paging group identifier and a first paging offset of a first paging group assigned to a mobile station from the first base station, a second paging group identifier of a second paging group, and a first Receiving a deregistration command (DREG-CMD) message containing paging group (PG) information including a paging offset and a paging group location update timer (PG_LU Timer) after moving from the first paging group to the second paging group. May include operating). In this case, the deregistration request message may include first mobility information indicating a moving speed of the mobile terminal, and the paging group information may be set based on the first mobility information.

According to the second embodiment, when the paging group location update timer expires, the mobile station transmits a ranging request message to the second base station (second ABS) including second mobility information indicating the movement speed of the mobile station. The method may further include receiving a ranging response message including new paging group information determined according to the second mobility information from the second base station. In this case, the ranging response message may further include new paging group location update timer information determined based on the second mobility information.

The second embodiment may further comprise the mobile terminal monitoring the paging message at the first paging offset. If the mobile station does not receive a paging message at the first paging offset, the mobile station may further include monitoring the paging message at the second paging offset.

In the second embodiment, the mobility information may indicate one of 'Fast', 'Medium', and 'Slow'.

According to a third embodiment of the present invention, a method for supporting idle mode operation of a mobile terminal to which one or more paging groups are allocated may include a deregistration request including mobility information indicating a moving speed of the mobile terminal from the mobile terminal. Receiving a DREG-REQ) message and including a first paging group identifier and a first paging offset of the first paging group assigned to the mobile station, a second paging group identifier and a second paging offset of the second paging group. And transmitting a deregistration command (DREG-CMD) message including group (PG) information. In this case, the deregistration request message may include mobility information indicating a moving speed of the mobile terminal, and the paging group information may be set based on the mobility information. In this case, the mobility information may indicate one of 'Fast', 'Medium' and 'Slow'. Of course, the mobility information may indicate the current speed or the average speed value of the mobile terminal.

In the third embodiment, the deregistration command message further includes a paging group location update timer set based on the mobility information.

The third embodiment may further include the base station transmitting a paging message to the mobile station at the first paging offset.

According to a fourth embodiment of the present invention, an idle mode mobile terminal to which one or more paging groups are allocated includes a transmitting module for transmitting a message, a receiving module for receiving a message, and an idle mode operation of the mobile terminal. It may include a paging group location update timer (PG_LU Timer) to support processor and paging group-based location update. At this time, the processor of the mobile terminal operates the paging group position update timer when the mobile terminal moves from the first paging group region to the second paging group region, and when the paging group position update timer expires, the mobile terminal provides mobility information indicating the speed of the mobile terminal. The ranging request message may be transmitted to the serving base station through the transmitting module, and the ranging response message including the new paging group information determined based on the mobility information may be received through the receiving module.

In the fourth embodiment, the mobility information may indicate one of 'Fast', 'Medium', and 'Slow'. In addition, the ranging response message may further include new paging group location update timer information determined based on mobility information.

The mobile terminal of the fourth embodiment includes a first paging group identifier and a first paging offset of a first paging group, a second paging group identifier of a second paging group, and a second paging offset allocated from the serving base station to the mobile terminal. A DREG-CMD message including paging group (PG) information may be received using a receiving module.

In the fourth embodiment, the processor may control the receiving module to monitor the paging message at the first paging offset, and if the paging message is not received at the first paging offset, monitor the paging message at the second paging offset.

In the fourth embodiment, the processor of the mobile terminal may transmit a deregistration request message requesting the start of the idle mode to the serving base station by controlling the transmitting module.

The first to fourth embodiments are only some of the preferred embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected will be described below by those skilled in the art. It can be derived and understood based on the detailed description of the invention.

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

First, the mobile station and the base station can efficiently perform the idle mode operation.

Second, it is possible to reduce the number of location updates that the idle mode mobile terminal performs excessively.

Third, the base station can reduce the overhead of the paging message transmitted to the mobile station by transmitting a paging message based on the paging group information currently assigned to the mobile station.

Fourth, the base station or the paging controller may determine the paging group allocated to the mobile terminal based on the mobility information of the mobile terminal. Therefore, efficient paging can be performed by adjusting a base station or a paging area to transmit a paging message according to the moving speed of the mobile station.

Fifth, the mobile station, the base station or the paging controller may set a PG_LU timer based on the mobility information of the mobile station, respectively. By using the PG_LU timer, the mobile station can efficiently perform location update, and the base station can reduce the overhead of the paging message.

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 That is, effects that are not intended in the application stage of the present invention may also be derived by those skilled in the art from the embodiments of the present invention.

Embodiments of the present invention relate to the operation of a mobile terminal in an idle mode, and disclose various methods and apparatus for location update based on a timer according to mobility information of the mobile terminal.

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 a terminal. (Terminal), etc. may be substituted.

Also, the transmitting end refers to a fixed and / or mobile node that provides a data service or a voice service, and the receiving end refers to a fixed and / or mobile node that receives a data service or a 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.

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. In particular, embodiments of the present invention may be supported by one or more of the standard documents P802.16e-2004, P802.16e-2005, P802.16Rev2, and P802.16m standard documents of the IEEE 802.16 system. That is, all terms disclosed in this document can be explained by the above standard document. In addition, steps or parts which are not described in order to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents.

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 paging groups and location update based on a paging group used in embodiments of the present invention.

In embodiments of the present invention, an Advanced Base Station (ABS) may be included in one or more multiple paging groups. At this time, each paging group has a different paging period and paging offset.

An Advanced Mobile Station (AMS) may be assigned to one or more paging groups. If the mobile terminal has multiple paging groups, a separate paging offset corresponding to each paging group may be assigned to the mobile terminal. If multiple paging groups are allocated to the mobile terminal and the paging groups allocated to the mobile terminal do not need to be updated.

In embodiments of the present invention, a first paging group (PPG) is defined. When one or more paging groups are allocated to a mobile terminal, one of the paging groups may be referred to as a primary paging group (PPG) and the remaining paging groups may be referred to as a secondary paging group (SPG). You can call If only one paging group is allocated to the mobile terminal, the paging group becomes the first paging group.

In embodiments of the present invention, the first paging group (PPG) may mean a paging group of a size smaller than or equal to that of a commonly used paging group. In this case, the second paging group SPG may mean a large paging group having a size equal to or larger than that of a general paging group. In this case, the SPG may take the form of including one or more PPGs, or may exist at a locally independent location. The size of PPG and SPG may vary according to user requirements or channel environment.

In the embodiments of the present invention, it is assumed that a plurality of paging groups (eg, a first paging group and a second paging group) are allocated to a mobile terminal. The mobile station performs location update when the current paging group is not the allocated paging group. The mobile station can detect a change in the paging group by monitoring the paging group identifier in the paging listening interval.

For example, the idle mode mobile station may wake up at the first paging offset during the paging listening interval and monitor PGID information in the corresponding paging group region. If the mobile station fails to retrieve the primary PGID information of the first paging group and retrieves the secondary PGID of the second paging group, the mobile station wakes up again at the second paging offset of the same paging period. You can monitor the message.

If the mobile station cannot find the identifier of the first paging group and the identifier of the second paging group, the mobile station can perform location update with the base station of the paging area of the current location.

3 is a diagram illustrating an operation of a PG_LU Timer and a PG_LU timer based position update used in embodiments of the present invention.

FIG. 3 assumes that one or more paging groups (a first paging group and a second paging group) are allocated to a mobile terminal. At this time, when the mobile station moves out of the paging area of the first paging group to the second paging group, the mobile station does not immediately perform a location update but operates a paging group location update timer (PG_LU Timer). can do.

3, the first paging offset of the first paging group is preferably smaller than the second paging offset for the second paging group. At this time, the distance between two adjacent paging offsets is preferably large enough so that the mobile terminal paged at the first paging offset can inform the base station before the second paging offset.

The mobile station can monitor the paging message transmitted by the base station at the first paging offset and the second paging offset corresponding to each paging group from the start time of the PG_LU timer to the expiration time. Alternatively, when the PG_LU timer is operated because the mobile terminal is out of the first paging offset region, the mobile terminal may monitor a paging message at the second paging offset.

When the PG_LU timer expires, the mobile station performs location update with the base station of the current paging group. At this time, the mobile station can perform location update by transmitting a ranging request (MOB_RNG-REQ) message including mobility information (Fast, Medium, Slow) indicating its movement speed to the base station. At this time, the base station and / or paging controller may allocate a new paging group of a different size to the mobile terminal based on the mobility information.

If the mobile station returns to the first paging group region again before the PG_LU timer expires, the mobile station resets the PG_LU timer and monitors the paging message at the first paging offset. In addition, if the mobile terminal leaves the first paging group and the PG_LU timer expires, the mobile station may perform location update regardless of whether the mobile terminal returns to the first paging group.

The base station transmits a paging message to the mobile station at the first paging offset to paging the mobile station, and if there is no response from the mobile station, the base station may page the mobile station secondaryly at the second paging offset.

Since the mobile station may not receive the paging message, the base station may repeatedly transmit the paging message several times for each of the first and second paging offset periods. If the base station transmits a paging message multiple times after the first paging offset, the base station transmits the paging message to the other paging area if the time from the first paging offset to the second paging offset is greater than the PG_LU timer. It can be determined that it has moved. Accordingly, the base station can delete the corresponding mobile station from the paging list or forcibly perform location update with the mobile station.

FIG. 4 is a diagram illustrating various methods for setting a PG_LU timer value using mobility information of a mobile terminal as one of embodiments of the present invention.

The first method of setting the PG_LU timer is a case in which the mobile station and the base station have a set of preset PG_LU timer values. That is, the mobile station measures its mobility information and selects an appropriate PG_LU timer value from the PG_LU timer set, which is a set of preset PG_LU timer values according to the mobility information.

The second method is for the mobile station to inform its base station or paging controller of its mobility information and to receive PG_LU timer information determined based on the mobility information from the base station or paging controller.

For example, the mobile station can inform the base station or the paging controller of one of two bits of mobility information (eg, Fast, Medium, Slow) according to its moving speed. Alternatively, the mobile station can inform the base station or the paging controller of mobility information (preferably having 8 bits in size) representing its movement speed as an absolute value. The base station or paging controller sets the PG_LU timer information determined according to the mobility information and transmits it to the mobile station.

Table 1 and Table 2 show the mobility information format of the mobile terminal.

Name Size (bits) Notes AMS mobility information 2 00: Fast
01: Medium
10: Slow
11: Reserved

Name Size (bits) Notes AMS mobility information Variable (preferably 8 bits) 0x00
0x01
...
0xFF: reserved

Table 1 is used when the mobility information represents the speed of the mobile terminal as two bits. That is, the mobile terminal may represent mobility information by dividing the current speed or the average speed of a specific section into Fast, Medium, and Slow based on a predetermined reference value.

Table 2 may be used when the mobility information preferably represents the absolute speed of the current mobile terminal as 8 bits in size. That is, the mobile station can inform the base station of the current speed or the absolute value of the average speed of a specific section as mobility information.

In the third method, a unique PG_LU timer set is maintained for each base station or paging controller, and the PG_LU timer value is determined for each mobile station based on the mobility information of the mobile station, and the PG_LU timer set is informed in a unicast format. It can be notified in a multicast or broadcast format through a super frame header (SFH).

In embodiments of the present invention, it is preferable that the minimum value of the PG_LU timer starts with a value smaller than the paging retry count * paging cycle.

Referring to FIG. 4, the PG_LU timer value may be determined through the above three methods. In case of using the first method, step S410 is unnecessary, and the mobile station can determine the PG_LU timer value through steps S412 and S414.

In case of using the second method, the mobile station transmits mobility information (Table 1 or Table 2) to the base station in a registration request (AAI_REG-REQ) message or ranging request (AAI_RNG-REQ) message to the base station before step S410. And transmitting to the base station.

That is, when the mobile station registers with a new base station or performs location update, the mobile station may further include mobility information of the mobile station in a registration request message or a ranging request message to the base station. The base station and / or paging controller may determine the PG_LU timer value based on the mobility information of the mobile station, and allocate a paging group suitable for the mobile station.

Accordingly, the base station transmits to the mobile station by including at least one of the PG_LU timer information and the paging group information determined based on the mobility information in the registration response (AAI_REG-RSP) message or ranging response (AAI_RNG-RSP) message as in step S410 Can be.

In the case of using the third method, the base station may transmit the PG_LU timer set to the mobile station in a multicast or broadcast method by including the PG_LU timer set in a superframe header (SFH) or neighboring base station advertisement (AAI_NBR-ADV) message as in step S410. have.

The mobile station may measure mobility for its own moving speed (S412), and determine a PG_LU timer value according to mobility information from the PG_LU timer set received from the base station (S414).

Table 3 below shows one of the formats of the PG_LU timer information.

designation Size Contents PG_LU_Timer Information variable 0x00: Min
0X01: Medium
0X10: Max (N frames)
0X11: reserved

Table 3 shows PG_LU timer information used when mobility information is configured of (Fast, Medium, Slow). At this time, the minimum value of the PG_LU timer is preferably determined to be smaller than the product of the number of paging retries used by the base station and the paging period. The PG_LU timer information of Table 3 may be defined as a global variable, and the mobile terminal may cache the information and use it implicitly. For example, when the mobility information of the mobile terminal indicates a fast, the PG_LU timer information may be set to a Min value mapped to the fast.

Table 4 below shows another one of formats of PG_LU timer information.

designation Size Contents PG_LU_Timer Information variable 0x00: Min
...
0XFE: Max (N frames)
0XFF: reserved

Table 4 may be used when the mobility information indicates the current specific speed or the specific average speed of the mobile terminal. In this case, a timer value mapped to the speed of the mobile terminal may be used among 254 timer values ranging from the minimum value to the maximum value. Also in Table 4, the minimum value of the PG_LU timer is preferably determined to be smaller than the product of the number of paging retries used by the base station and the paging period.

PG_LU timer information shown in Tables 3 and 4 is preferably maintained by the mobile station and / or the base station, and the PG_LU timer information maintained by the mobile station may be updated according to each base station. In addition, the PG_LU timer information of Table 3 and Table 4 may be transmitted in a PG_LU timer set including all of the PG_LU timer values, or may be transmitted in a form including only a specific value (e.g. index).

FIG. 5 is a diagram illustrating one of location updating methods using a PG_LU timer as one of embodiments of the present invention.

In idle mode, paging may be performed in paging group units. For example, a mobile station (AMS) can belong to one or multiple paging groups. A paging controller (PC) of each paging group performs paging to find a corresponding mobile terminal when a user packet transmitted from a call or an external network to a mobile terminal is received. In this case, the paging controller delivers a paging message to all base stations (ABS) in the paging group, each base station receives the paging message (eg, paging advertisement (MOB_PAG-ADV) message) to the mobile station You can perform paging with

In FIG. 5, it is assumed that a mobile station maintains preset PG_LU timer information or receives preset PG_LU timer information through an SFH broadcasted from a base station and / or a neighbor base station advertisement message. In addition, the mobility information format used in FIG. 5 may refer to Tables 1 and 2, and the PG_LU timer information may refer to Tables 3 and 4.

In addition, in FIG. 5, a first base station (first ABS; serving base station) belongs to a first paging group (PPG) region, and a second base station (second ABS) belongs to a second paging group (SPG) region. Assume

Referring to FIG. 5, the mobile station transmits a deregistration request (MOB_DREG-REQ) message to the first base station to request release and start of idle mode from the first base station (S501).

The first base station receiving the deregistration request message may share information related to the idle mode through the paging controller and the backbone network. That is, the first base station can inform the paging controller of the mobile station identifier (MS ID) and the first base station identifier (BS ID) to enter the idle mode. In addition, the paging controller may inform the first base station of a paging group identifier or paging controller identifier information. The paging group identifier or paging controller identifier may be used to transmit and receive a paging message (S502).

In FIG. 5, the paging controller PC may allocate one or more paging groups to the mobile station. That is, the PC may inform the first base station of paging group information (eg, a first paging group identifier, a second paging group identifier, a first paging offset, and a second paging offset).

The first base station may transmit a deregistration command (MOB_DREG-CMD) message to the mobile terminal in response to the deregistration request message. The deregistration command message may include paging information (eg, paging cycle, paging offset, and paging listen interval). The deregistration command message may also include a paging controller identifier (PC ID), paging group information (eg, a first paging group identifier (Primary PG ID), a second paging group identifier (Secondary PG ID), a first paging offset ( A paging offset), a second paging offset), and a temporary identifier (S503).

Referring to FIG. 5, the mobile station can receive a paging message based on paging information and paging group information included in the DREG-CMD message in the first paging group region. For example, the mobile station can monitor the radio channel for paging messages delivered to it during the paging listening interval. That is, the mobile station can monitor the paging message of the first paging group transmitted from the first base station at the time indicated by the first paging offset. For the rest of the time, the mobile terminal may operate in a sleep mode or a radio turn off to reduce battery power consumption (S504).

The mobile terminal may move out of the first paging group region to the second paging group region (S505).

The mobile terminal may operate the PG_LU timer after entering the second paging group out of the first paging group region. At this time, the mobile terminal can determine the PG_LU timer value mapped to its own moving speed from the preset PG_LU timer set (S506).

The mobile station does not perform the location update while the PG_LU timer is operating, and may monitor the paging message transmitted by the second base station at the time indicated by the second paging offset (S507).

Even when the PG_LU timer expires, if the mobile station does not return to the first paging group region and remains in the second paging group region, the mobile terminal may perform location update with the second base station. In this case, the mobile terminal may include its mobility information in the ranging request message and transmit it to the second base station (S508).

The second base station transmits the mobility information of the mobile terminal to the paging controller through the backbone network (S509).

The paging controller allocates a new paging group to the mobile terminal based on the mobility information, and provides information about the new paging group (eg, a new first paging group identifier, a new second paging group identifier, a new first paging offset, and a new second paging). Offset) may be transmitted to the second base station (S510).

The second base station may transmit the new paging group information to the mobile station by including the ranging response message. Accordingly, the mobile terminal may perform an idle mode operation based on the new paging group information (S511).

6 is a diagram illustrating another one of a method of updating a location using a PG_LU timer as one of the embodiments of the present invention.

6 illustrates a method in which a first base station (ABS) or a paging controller (PC) transmits PG_LU timer information in a unicast format to a mobile station (AMS). The mobile terminal can acquire its mobility information through various methods in a steady state. The format of the mobility information used in FIG. 6 may refer to Tables 1 and 2, and the format of the PG_LU timer information may refer to Tables 3 and 4.

In addition, in FIG. 5, a first base station (first ABS; serving base station) belongs to a first paging group (PPG) region, and a second base station (second ABS) belongs to a second paging group (SPG) region. Assume

In FIG. 6, the mobile station may transmit a deregistration request message including mobility information to the first base station to request deregistration and initiation of idle mode (S601).

The first base station receiving the deregistration request message may share information related to the idle mode through the paging controller and the backbone network. That is, the first base station may inform the paging controller of the mobile station identifier (MS ID), the first base station identifier (BS ID) and the mobility information of the mobile station entering the idle mode (S602).

The paging controller may determine the PG_LU timer information based on the mobility information (S603).

In addition, the paging controller may determine the paging group based on the mobility information of the mobile terminal. In this case, it is assumed that one or more paging groups may be allocated to the mobile terminal, and the first and second paging groups are allocated to the mobile terminal (S604).

The paging controller may inform the first base station of the determined PG_LU timer information and paging group information. In this case, the paging group information may include a first paging group identifier (Primary PG ID), a second paging group identifier (Secondary PG ID), a first paging offset and a second paging offset. The paging group identifier or the paging controller identifier may be used to transmit and receive a paging message (S605).

The first base station may transmit a deregistration command (MOB_DREG-CMD) message to the mobile terminal in response to the deregistration request message. The deregistration command message may include one or more of paging information, PG_LU timer information, paging group (PG) information, a paging controller identifier (PC ID), and a temporary identifier (S606).

Referring to FIG. 6, when a mobile station receives a DREG-CMD message, the mobile station enters an idle mode and receives a paging message based on paging information and paging group information included in the DREG-CMD message in the first paging group region. have. For example, the mobile station can monitor the radio channel for paging messages delivered to it during the paging listening interval.

That is, the mobile station can monitor the paging message of the first paging group transmitted from the first base station at the time indicated by the first paging offset. For the rest of the time, the mobile terminal may operate in a sleep mode or a radio turn off to reduce power consumption (S607).

The mobile terminal may move out of the first paging group (PPG) area and move to the second paging group (SPG) area. After leaving the first paging group region, the mobile terminal can operate the PG_LU timer based on the PG_LU timer information received in step S606.

For example, when the PG_LU timer set is included in the PG_LU timer information, the mobile terminal may select a PG_LU timer value mapped to its own moving speed and operate the PG_LU timer. If the PG_LU timer information includes the index of the PG_LU timer or the specific PG_LU timer value determined by the base station or the paging controller according to the mobility information, the mobile terminal may operate the PG_LU timer with the corresponding PG_LU timer value (S608).

The mobile station does not perform location update in the second paging group region while the PG_LU timer is operating, and may monitor the paging message transmitted by the second base station at the time indicated by the second paging offset (S609).

When the PG_LU timer expires, if the mobile station does not return to the first paging group area but remains in the second paging group area, the mobile station may perform location update with the second base station. That is, the mobile terminal may include its mobility information in the ranging request message and transmit it to the second base station (S610).

The second base station transmits the mobility information of the mobile terminal to the paging controller through the backbone network (S611).

The paging controller allocates the updated paging group to the mobile terminal based on the mobility information, and provides information about the new paging group (eg, new first paging group identifier, new second paging group identifier, new first paging offset, and new second). Paging offset) may be transmitted to the second base station (S612).

The second base station may include the new paging group information and the new PG_LU timer information in the ranging response message and transmit it to the mobile station (S613). Accordingly, the mobile station can perform an idle mode operation based on the new paging group information.

FIG. 7 is a diagram of a base station and a mobile station apparatus in which the embodiments of the present invention described with reference to FIGS. 2 to 6 are performed as one of the embodiments of the present invention.

The mobile station (AMS) and the base station (ABS) are antennas 700 and 710 capable of transmitting and receiving information, data, signals, and / or messages, and a transmission module (Tx module, 740, 730) for transmitting a message by controlling the antenna. Rx module (760, 750) for receiving a message by controlling the antenna, memory (780, 770) and the transmission module for temporarily or continuously storing the information related to the communication with the base station and the processing of the processor And a processor 720 and 710 for controlling the receiving module and the memory, respectively. In this case, the base station may be a femto base station or a macro base station.

The antennas 700 and 710 transmit a signal generated by the transmission modules 740 and 730 to the outside or receive a wireless signal from the outside and transmit the signal to the receiving modules 760 and 750. If a multiple antenna (MIMO) function is supported, two or more antennas may be provided.

Processors 720 and 710 typically control the overall operation of a mobile terminal or base station. In particular, the processor may perform a control function for performing the above-described embodiments of the present invention, a medium access control (MAC) frame variable control function, a handover function, an authentication and encryption function, etc. according to service characteristics and a propagation environment. Can be done. In addition, the processors 720 and 730 may further include an encryption module for controlling encryption of various messages and a timer module for controlling transmission and reception of various messages, respectively.

The transmission modules 740 and 730 may perform predetermined coding and modulation on signals and / or data that are scheduled from a processor and transmitted to the outside, and then may be transmitted to the antennas 700 and 710.

The receiving modules 760 and 750 decode and demodulate the radio signals received through the antennas 700 and 710 from the outside to restore the original data to the processor 720 and 730. I can deliver it.

The memory 780 or 770 may store a program for processing and controlling a processor, and input / output data (in the case of a mobile station, an uplink grant allocated from a base station, a system information, and a station identifier) STID), flow identifier (FID), action time (Action Time), area allocation information, frame offset information, etc.) may be temporarily stored.

In addition, the memory may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory), RAM Random Access Memory (RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), Magnetic Memory, Magnetic It may include a storage medium of at least one type of disk, optical disk.

Embodiments of the present invention described with reference to FIGS. 2 to 6 may be performed using components and functions of the mobile terminal and the base station apparatus described with reference to FIG. 7. Hereinafter, the functions of the mobile station and the base station apparatus will be described in more detail.

Processors 720 and 730 of the base station and the mobile terminal may further include an idle mode module and a timer module for performing the idle mode operation disclosed in the embodiments of the present invention. In particular, the processor of the mobile terminal may acquire mobility information by measuring its movement speed during the normal mode operation or the idle mode operation.

In addition, the processor of the mobile station may maintain the preset PG_LU timer set, or may maintain the PG_LU timer set received in the unicast or broadcast format from the base station. Therefore, the mobile terminal can operate the PG_LU timer based on its mobility information.

The mobile terminal may control the transmitting module, the receiving module, the memory, and the processor to receive a paging message transmitted from the base station or the paging controller or perform location update based on the paging group information and the PG_LU timer information.

For example, the mobile station monitors the paging message at the first paging offset in the first paging group region, starts the PG_LU timer when it moves to the second paging group region, and the second paging offset while the PG_LU timer is running. You can monitor the paging message at. In addition, the mobile station may perform location update with the base station when the PG_LU timer expires. These operations have been described in detail with reference to FIGS. 3 to 6. Therefore, the mobile terminal can reduce the overhead added to the network by reducing the number of unnecessary location updates.

The base station or paging controller may determine the PG_LU timer information and the paging group (PG) information based on the mobility information of the mobile terminal by controlling the transmitting module, the receiving module, the memory, and the processor. The base station may deliver the PG_LU timer information and the paging group information to the mobile station in a unicast or broadcast manner during the idle mode operation. Accordingly, the base station or the paging controller may transmit a paging message at the first paging offset or the second paging offset when there is a call or downlink data for the mobile station. These operations have been described in detail with reference to FIGS. 3 to 6.

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. For example, software code may be stored in the memory units 780 and 790 to be driven by the processors 720 and 730. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

In addition, in the embodiments of the present invention, the base station may be a serving base station (first base station) or a second base station. The concept of the first base station and the second base station is relative, and the serving base station refers to a base station that provides a service when the mobile station enters an idle mode.

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 paging groups used in embodiments of the present invention.

3 is a diagram illustrating an operation of a paging group position update timer (PG_LU Timer) used in embodiments of the present invention.

4 is a diagram illustrating a method of allocating a PG_LU timer value using mobility information of a mobile terminal as one of embodiments of the present invention.

FIG. 5 is a diagram illustrating one of location updating methods using a PG_LU timer as one of embodiments of the present invention.

6 is a diagram illustrating another one of a method of updating a location using a PG_LU timer as one of the embodiments of the present invention.

FIG. 7 is a diagram of a base station and a mobile station apparatus in which the embodiments of the present invention described with reference to FIGS. 2 to 6 are performed as one of the embodiments of the present invention.

Claims (20)

A method in which a mobile terminal to which one or more paging groups are assigned performs an idle mode operation. Operating a paging group position update timer (PG_LU Timer) when the mobile terminal in the idle mode moves from the first paging group region to the second paging group region; Transmitting a ranging request message to a serving base station including mobility information indicating a speed of the mobile terminal when the paging group location update timer expires; And And receiving a ranging response message including new paging group information determined based on the mobility information. The method of claim 1, The mobility information indicates one of 'Fast', 'Medium' and 'Slow'. The method of claim 1, The ranging response message further includes new paging group location update timer information determined based on the mobility information. The method of claim 1, Paging group (PG) information including a first paging group identifier and a first paging offset of a first paging group, a second paging group identifier of a second paging group, and a second paging offset allocated from the serving base station to the mobile station; Receiving a deregistration command (DREG-CMD) message comprising a; further comprising, idle mode operation method. The method of claim 4, wherein Monitoring a paging message at the first paging offset; If not receiving a paging message at the first paging offset, further comprising monitoring a paging message at the second paging offset. A method in which a mobile terminal to which one or more paging groups are assigned performs an idle mode operation. Transmitting, by the mobile terminal, a deregistration request (DREG-REQ) message requesting entry into idle mode to a first base station; A paging group (PG) comprising a first paging group identifier and a first paging offset of a first paging group assigned to the mobile station from the first base station, a second paging group identifier of a second paging group, and a second paging offset Receiving a deregistration command (DREG-CMD) message including information; And Operating a paging group location update timer (PG_LU Timer) after moving from the first paging group to the second paging group; The deregistration request message includes first mobility information indicating a moving speed of the mobile terminal, and the paging group information is set based on the first mobility information. The method of claim 6, Transmitting a ranging request message to a second base station, the ranging request message including second mobility information indicating a movement speed of the mobile terminal when the paging group location update timer expires; And And receiving a ranging response message including new paging group information determined according to the second mobility information from the second base station. The method of claim 7, wherein The ranging response message further includes new paging group location update timer information determined based on the second mobility information. The method of claim 6, Monitoring a paging message at the first paging offset; If not receiving a paging message at the first paging offset, further comprising monitoring a paging message at the second paging offset. The method of claim 6, The mobility information indicates one of 'Fast', 'Medium' and 'Slow'. A method for supporting idle mode operation of a mobile station to which one or more paging groups are assigned, Receiving a deregistration request (DREG-REQ) message from the mobile terminal, the deregistration request including mobility information indicating a movement speed of the mobile terminal; And A registration including paging group (PG) information including a first paging group identifier and a first paging offset of a first paging group assigned to the mobile terminal, a second paging group identifier of a second paging group, and a second paging offset Sending a release command (DREG-CMD) message, The deregistration request message includes mobility information indicating a movement speed of the mobile terminal, and the paging group information is set based on the mobility information. The method of claim 11, The mobility information indicates one of 'Fast', 'Medium' and 'Slow', idle mode operation support method. The method of claim 11, The deregistration command message further includes a paging group location update timer set based on the mobility information. The method of claim 11, And transmitting a paging message to the mobile station at the first paging offset. In an idle mode mobile terminal to which one or more paging groups are assigned, The mobile terminal, A sending module for sending a message; A receiving module for receiving a message; A processor for controlling an idle mode operation of the mobile terminal; And Includes paging group location update timer (PG_LU Timer) to support paging group-based location update. The processor operates the paging group location update timer when the mobile station moves from the first paging group area to the second paging group area, and provides mobility information indicating the speed of the mobile terminal when the paging group location update timer expires. Transmitting a ranging request message including a ranging request message to the serving base station through the transmitting module, and receiving a ranging response message including the new paging group information determined based on the mobility information through the receiving module. Terminal. The method of claim 15, The mobility information indicates one of 'Fast', 'Medium' and 'Slow'. The method of claim 15, The ranging response message further includes new paging group location update timer information determined based on the mobility information. The method of claim 15, The mobile station includes a paging group including a first paging group identifier and a first paging offset of a first paging group assigned to the mobile terminal from the serving base station, a second paging group identifier and a second paging offset of a second paging group. A mobile terminal, characterized in that for receiving a deregistration command (DREG-CMD) message including (PG) information using the receiving module. The method of claim 18, The processor controls the receiving module to monitor a paging message at the first paging offset, And if the paging message is not received at the first paging offset, monitoring the paging message at the second paging offset. The method of claim 16, And the processor of the mobile terminal transmits a deregistration request message for requesting to start the idle mode to the serving base station by controlling the transmitting module.

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