KR101567830B1 - 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 the movement speed of a mobile terminal in a wireless access system, and a method and apparatus using a timer in location update. As a first embodiment of the present invention, a method for performing an idle mode operation of a mobile station to which at least one paging group is allocated is characterized in that the mobile station in the idle mode is in a first paging group (PPG) A step of operating a paging group location update timer (PG_LU Timer) and a ranging request message including mobility information indicating the speed of the mobile terminal when the paging group location update timer expires, when the mobile station moves to a group area (SPF: Secondary Paging Group) To the serving base station, and receiving a ranging response message including new paging group information determined based on the mobility information.

Idle mode, location update, paging group location update timer, mobility information

Description

[0001] The present invention relates to a method and an apparatus for 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, the paging group used in the idle mode and the idle mode of the mobile station will be briefly described with reference to the embodiments of the present invention.

The idle mode is generally an operation for supporting a DL (DL) broadcast traffic transmission periodically, even if the mobile terminal does not register with a specific base station when moving a radio link environment composed of multiple base stations It says.

The idle mode may benefit the mobile terminal by eliminating the activation requirements and general operating requirements associated with the handover. The idle mode can limit the mobile terminal activity to be scanned at the discrete period, thereby saving power and operational resources used by the mobile terminal.

In addition, the idle mode provides a simple and appropriate way to inform the mobile terminal about pending downlink traffic, and removes wireless interface and hand over (HO) traffic from inactive terminals Thereby benefiting the network and the base station.

1 is a diagram showing an example of a paging group composed of a plurality of base stations.

Paging refers to a function of grasping a position (e.g., a base station or a certain switching center) of a corresponding mobile station (MS) when an incoming call is generated in mobile communication. As shown in FIG. 1, a plurality of base stations (BSs) supporting an idle mode belong to a paging group and can configure a paging area.

At this time, the paging group represents a logical group. The purpose of the paging group is to provide a neighbor coverage area that can be downlinked (DL) if there is traffic with a target of a mobile station (MS). It is desirable that the paging group meet the condition that a particular terminal is large enough to be present for most of the time in the same paging group and that the paging load should be small enough to maintain a reasonable level.

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

It is an object of the present invention to provide an efficient idle mode operation for a mobile terminal 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 that an idle mode mobile terminal performs excessively.

It is yet 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.

It is still another object of the present invention to provide a method for determining a paging group to be assigned to a mobile terminal based on 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 a PG_LU timer using mobility information of the mobile station.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. Lt; / RTI >

According to an aspect of the present invention, there is provided an idle mode mobile terminal in a wireless access system, including: a location update method based on mobility information indicating a mobile speed of a mobile terminal; .

As a first exemplary embodiment of the present invention, a method for performing an idle mode operation of a mobile station to which at least one paging group is allocated includes the steps of determining whether a mobile station in an idle mode is in a primary paging group (PPG) A step of operating a paging group location update timer (PG_LU Timer) when moving from a second paging group area (SPF) to a secondary paging group (SPF) Transmitting a ranging request message to the serving base station and receiving a ranging response message including new paging group information determined based on the mobility information. At this time, the mobility information may indicate one of 'Fast', 'Medium' and 'Slow'. Of course, the mobility information may represent the absolute speed value of the current mobile terminal or may represent 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.

In the first embodiment, a mobile station transmits a first paging group identifier (a first paging group identifier) and a first paging offset of a first paging group allocated to a mobile station from a serving base station, a second paging group identifier (DREG-CMD) message including paging group (PG) information including a first paging group ID, a second paging group IDentifier, and a second paging offset.

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

As a second exemplary embodiment of the present invention, a method for performing an idle mode operation in a mobile station to which at least one paging group is allocated includes receiving a DREG-REQ message requesting the mobile terminal to enter an idle mode To a first base station (first AMS), a first paging group identifier and a first paging offset of a first paging group assigned to a mobile terminal from a first base station, a second paging group identifier of a second paging group, (DREG-CMD) message including paging group (PG) information including a paging group (PG) 2 paging offset, a paging group location update timer ). ≪ / RTI > At this time, the deregistration request message includes the first mobility information indicating the moving speed of the mobile terminal, and the paging group information can be set based on the first mobility information.

In the second embodiment, when the paging group location update timer expires, the mobile station transmits a ranging request message including second mobility information indicating the moving speed of the mobile station to the second base station (second ABS) And receiving a ranging response message including new paging group information determined according to the second mobility information from the second base station. At this time, 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 include the step of the mobile terminal monitoring the paging message at the first paging offset. If the mobile terminal does not receive the paging message at the first paging offset, the mobile terminal may further monitor the paging message at the second paging offset.

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

As a third embodiment among the embodiments of the present invention, a method of supporting an idle mode operation of a mobile terminal to which at least one paging group is allocated comprises the steps of: receiving a de-registration request including mobility information indicating a moving speed of the mobile terminal DREG-REQ) message, a paging message including a first paging group identifier and a first paging offset of a first paging group assigned to a mobile terminal, a second paging group identifier of a second paging group, and a second paging offset (DREG-CMD) message containing group (PG) information. At this time, the deregistration request message includes the mobility information indicating the moving speed of the mobile terminal, and the paging group information can be set based on the mobility information. At this time, the mobility information may indicate one of 'Fast', 'Medium' and 'Slow'. Of course, the mobility information may indicate the current speed or 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 comprise the base station transmitting the paging message to the mobile terminal at the first paging offset.

As a fourth embodiment of the present invention, an idle mode mobile terminal to which at least one paging group is allocated includes a transmitting module for transmitting a message, a receiving module for receiving a message, And a paging group location update timer (PG_LU Timer) to support location updates based on processors and paging groups. At this time, the processor of the mobile terminal operates the paging group location update timer when the mobile terminal moves from the first paging group area to the second paging group area, and when the paging group location update timer expires, the mobility information indicating the speed of the mobile terminal And transmits the ranging request message including the new paging group information determined based on the mobility information 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 through the receiving module.

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

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

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

In the fourth embodiment, the processor of the mobile terminal can transmit a registration release request message requesting initiation of the idle mode to the serving base station by controlling the transmission module.

It should be noted that the first to fourth embodiments are only a part of preferred embodiments of the present invention and that various embodiments in which the technical features of the present invention are reflected may be applied by persons having ordinary skill in the art And 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 terminal and the base station can efficiently perform the idle mode operation.

Second, the number of location updates that the idle mode mobile terminal performs excessively can be reduced.

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

Fourth, the base station or the paging controller can 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 the base station or the paging area to transmit the paging message according to the moving speed of the mobile terminal.

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

The effects obtained in the embodiments of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be found in the following description of the embodiments of the present invention, Can be clearly derived and understood by those skilled in the art. That is, unintentional effects in the application step of the present invention can also be derived from those of ordinary skill 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 state, and disclose various methods and apparatus for location-based location update based on mobile terminal mobility information.

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or characteristic may be considered optional unless otherwise expressly 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, there is no description of procedures or steps that may obscure the gist of the present invention, nor is any description of steps or steps that can be understood by those skilled in the art.

The embodiments of the present invention have been described herein with reference to a data transmission / reception relationship between a base station and a mobile station. Here, the base station is meaningful as a terminal node of a network that directly communicates with a mobile station. The specific operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be.

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 a base station or other network nodes other than the base station. At this time, 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.

Also, the 'Mobile Station (MS)' may be a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), a mobile terminal, The term " 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 the uplink, the mobile station may be the transmitting end and the base station may be the receiving end. Similarly, in a 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 IEEE 802 systems, 3GPP systems, 3GPP LTE systems and 3GPP2 systems, which are wireless access systems. 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 of the terms disclosed in this document can be described by the standard document. In addition, among the embodiments of the present invention, steps or portions that are not described in order to clarify the technical idea of the present invention can be supported by the documents.

Hereinafter, preferred embodiments according to 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, the specific terms used in the embodiments of the present invention are provided to facilitate understanding of the present invention, and the use of such specific terms can be changed to other forms without departing from the technical idea of the present invention .

2 is a diagram illustrating location updates of paging groups and paging group based 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 different paging periods and paging offsets.

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. There is no need to perform location update when a multiple paging group is allocated to the mobile terminal and the mobile terminal moves the assigned paging groups.

In the embodiments of the present invention, a first paging group (PPG) is defined. When one or more paging groups are assigned 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) ). 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 refer to a small paging group of a size that is less than or equal to the paging group typically used. At this time, the second paging group (SPG) may mean a large paging group having a size equal to or greater than a general paging group. In this case, the SPG may include one or more PPGs, or may be located in a locally independent position. The size of the PPG and SPG may vary depending on the user's requirements or the channel environment.

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

For example, the idle mode mobile terminal may wake up at the first paging offset during the paging listening interval and monitor the PGID information in the corresponding paging group area. If the mobile terminal can not retrieve the primary PGID information of the first paging group and searches for the secondary PGID of the second paging group, the mobile terminal awakes again at the second paging offset of the same paging period, Messages can be monitored.

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

FIG. 3 is a diagram illustrating an operation of a paging group location update timer (PG_LU Timer) used in embodiments of the present invention and a location update based on a PG_LU timer.

3 assumes that the mobile terminal is assigned one or more paging groups (a first paging group and a second paging group). In this case, when the mobile terminal moves to the second paging group after leaving the paging area of the first paging group, the mobile terminal performs a paging group location update timer (PG_LU Timer) can do.

Also, in Figure 3, the first paging offset of the first paging group is preferably less than the second paging offset for the second paging group. At this time, it is preferable that the distance between two adjacent paging offsets is sufficiently large so that the paged mobile terminal at the first paging offset can notify the base station before the second paging offset.

The MS can monitor the paging message transmitted by the BS in the first paging offset corresponding to each paging group and the second paging offset from the start time point to the expiration time point of the PG_LU timer. Alternatively, if the mobile terminal is out of the first paging offset region and the PG_LU timer is activated, the mobile terminal can monitor the paging message at the second paging offset.

When the PG_LU timer expires, the MS performs location update with the BS 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 moving speed to the base station. At this time, the base station and / or the paging controller may allocate new paging groups of different sizes to the mobile terminal based on the mobility information.

If the mobile terminal returns to the first paging group area again before the PG_LU timer expires, the mobile terminal resets the PG_LU timer and monitors the paging message at the first paging offset. In addition, when the mobile terminal moves out of the first paging group and the PG_LU timer expires, the mobile terminal can perform location update irrespective of whether the mobile terminal returns to the first paging group.

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

Since the mobile terminal may not receive the paging message, the base station may repeat the paging message several times for each of the first paging offset and the second paging offset period. If the base station transmits the paging message a plurality of times after the first paging offset, if the time from the last paging message transmitted at the first paging offset to the second paging offset is greater than the PG_LU timer, It can be judged that it has moved. Accordingly, the base station can delete the corresponding mobile terminal from the paging list or force the location update with the mobile terminal.

4 is a diagram illustrating various methods of 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 when the mobile station and the base station have a set of predetermined PG_LU timer values. That is, the mobile terminal measures its own mobility information and selects an appropriate PG_LU timer value from the PG_LU timer set, which is a set of PG_LU timer values preset according to the mobility information.

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

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

The following Tables 1 and 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 indicates the speed of the mobile terminal as the size of 2 bits. That is, the mobile terminal can distinguish the current speed or the average speed of a specific section by Fast, Medium, and Slow based on a predetermined reference value to represent mobility information.

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

The third method is to maintain a unique PG_LU timer set for each base station or paging controller, determine the value of the PG_LU timer for each mobile terminal based on the mobility information of the mobile terminal, inform it in a unicast format, or set the PG_LU timer set A multicast or broadcast format through a Super Frame Header (SFH) or the like.

In the embodiments of the present invention, the minimum value of the PG_LU timer preferably 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 three methods described above. If the first method is used, step S410 is unnecessary, and the mobile terminal can determine the PG_LU timer value through steps S412 and S414.

If the second method is used, the mobile station transmits mobility information (Table 1 or Table 2) of the mobile station to a registration request (AAI_REG-REQ) message or a ranging request (AAI_RNG-REQ) message to the base station before step S410 To the base station is performed.

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

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

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

The mobile terminal measures the mobility of its own moving speed (S412), and determines the PG_LU timer value according to the 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 extension.

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 the mobility information is composed of (Fast, Medium, Slow). In this case, the minimum value of the PG_LU timer is preferably determined to be a value smaller than the product of the number of paging retries used in the base station and the paging cycle. The PG_LU timer information in Table 3 can be defined as a global variable, and the mobile terminal can cache and use the information implicitly. For example, when the mobility information of the mobile station indicates Fast, the PG_LU timer information may be set to a Min value mapped to Fast.

Table 4 below shows another format of the PG_LU timer information.

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

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

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

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

In idle mode (IDLE MODE), paging can be performed on a paging group basis. For example, a mobile terminal (AMS) may belong to one or more paging groups. A paging controller (PC: Paging Controller) of each paging group performs paging to find a corresponding mobile terminal when a user packet is transmitted from a call or an external network to the mobile terminal. At this time, the paging controller delivers a paging message to all base stations (ABS) in the paging group, and each base station receives the paging message and broadcasts a paging message (for example, a paging advertisement (MOB_PAG-ADV) message) As shown in FIG.

In FIG. 5, it is assumed that the mobile terminal maintains the preset PG_LU timer information or receives the preset PG_LU timer information through the SFH broadcasted from the base station and / or the 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.

5, the first base station (first ABS; serving base station) belongs to the first paging group (PPG) region and the second base station (second ABS) belongs to the second paging group I suppose.

Referring to FIG. 5, the mobile station transmits a MOB_DREG-REQ message to the first base station in order to request the first base station to start the release and idle mode (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 terminal identifier (MS ID) and the first base station identifier (BS ID) entering the idle mode. In addition, the paging controller may inform the first base station of the paging group ID or the paging controller identifier information. The paging group identifier or the paging controller identifier may be used to send and receive a paging message (S502).

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

The first base station can 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 (e.g., a paging cycle, a paging offset, and a paging listen interval). The deregistration command message may also include a paging controller identifier (PC ID), paging group information (e.g., a first paging group identifier (Primary PG ID), a second paging group identifier (Secondary PG ID), a first paging offset Paging offset) and a second paging offset), and a temporary identifier (S503).

Referring to FIG. 5, the mobile terminal can receive a paging message based on paging information and paging group information included in a DREG-CMD message in a first paging group area. For example, the mobile terminal may monitor a wireless channel to see if there is a paging message delivered to it during a paging listening interval. That is, the mobile terminal 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. During the remaining time, the mobile terminal operates in a sleep mode or a radio turn off mode to reduce battery consumption (S504).

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

The mobile terminal can operate the PG_LU timer after entering the second paging group out of the first paging group area. 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 terminal 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).

If the mobile terminal does not return to the first paging group area and remains in the second paging group area even when the PG_LU timer expires, the mobile terminal can perform location update with the second base station. At this time, the mobile station can transmit its mobility information to the second base station by including it in the ranging request message (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 transmits information about the new paging group (e.g., a new first paging group identifier, a new second paging group identifier, a new first paging offset, Offset) to the second base station (S510).

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

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

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

5, the first base station (first ABS; serving base station) belongs to the first paging group (PPG) region and the second base station (second ABS) belongs to the second paging group I suppose.

In FIG. 6, the mobile station may transmit a deregistration request message including mobility information to the first base station to request the deregistration and idle mode start (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 can inform the paging controller of the mobile terminal identifier (MS ID), the first base station identifier (BS ID), and the mobility information of the mobile terminal entering the idle mode (S602).

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

Also, the paging controller can determine the paging group based on the mobility information of the mobile terminal. At this time, one or more paging groups may be allocated to the mobile terminal, and it is assumed that the first paging group and the second paging group 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. At this time, 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 send and receive a paging message (S605).

The first base station can 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 at least one of paging information, PG_LU timer information, paging group (PG) information, a paging controller identifier (PC ID), and a temporary identifier (S606).

6, when the mobile terminal receives the DREG-CMD message, it enters the idle mode and receives the paging message based on the paging information and paging group information included in the DREG-CMD message in the first paging group area have. For example, the mobile terminal may monitor a wireless channel to see if there is a paging message delivered to it during a paging listening interval.

That is, the mobile terminal 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. During the rest of the time, the mobile terminal operates in a sleep mode or a radio turn off mode to reduce battery consumption (S607).

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

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

The mobile terminal does not perform location update in the second paging group area while the PG_LU timer is operating and can monitor the paging message transmitted by the second base station at the time indicated by the second paging offset in step S609.

When the PG_LU timer expires, if the mobile terminal does not return to the first paging group area and remains in the second paging group area, the mobile terminal can perform location update with the second base station. That is, the mobile station may transmit its mobility information to the second base station by including it in the ranging request message (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 transmits information about the new paging group (e.g., a new first paging group identifier, a new second paging group identifier, a new first paging offset, Paging offset) to the second base station (S612).

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

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

The mobile terminal (AMS) and the base station (ABS) include antennas 700 and 710 capable of transmitting and receiving information, data, signals and / or messages, transmission modules (Tx modules 740 and 730 A receiving module (Rx module, 760, 750) for controlling the antenna to receive a message, memories 780, 770 for temporarily storing or continuously storing information related to communication with the base station and processing of the processor, A processor 720, 710 that controls the receiving module and the memory, respectively. At this time, the base station may be a femto base station or a macro base station.

The antennas 700 and 710 transmit the signals generated by the transmission modules 740 and 730 to the outside or receive radio signals from the outside and transmit the signals to the reception modules 760 and 750. When a multi-antenna (MIMO) function is supported, more than two antennas may be provided.

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

The transmission modules 740 and 730 may perform predetermined coding and modulation on signals and / or data to be transmitted to the outside and transmit them to the antennas 700 and 710 after they are scheduled from the processor.

The receiving modules 760 and 750 decode and demodulate the radio signals received from the outside through the antennas 700 and 710 and restore them in the form of original data to be transmitted to the processors 720 and 730 .

The memories 780 and 770 may store a program for processing and control of the processor and may store data input / output (UL grant, system information, station identifier (in the case of a mobile station, STID), a flow identifier (FID), an action time (Action Time), area allocation information, frame offset information, and the like).

The memory may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (e.g., SD or XD memory), a RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM A disk, and / or an optical disk.

The embodiments of the present invention described in FIG. 2 to FIG. 6 can be performed using the components and functions of the mobile terminal and the base station apparatus described in FIG. Hereinafter, the functions of the mobile station and the base station apparatus will be described in more detail.

The base stations and the processors 720 and 730 of 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 can acquire mobility information by measuring its own moving speed during normal mode operation or idle mode operation.

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

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

For example, the mobile terminal may monitor the paging message at the first paging offset in the first paging group area, start the PG_LU timer when moving to the second paging group area, and may also start the second paging offset Lt; RTI ID = 0.0 > paging < / RTI > Also, the mobile terminal can perform location update with the base station when the PG_LU timer expires. These operations are described in detail in FIGS. Accordingly, the mobile terminal can reduce unnecessary location update times, thereby reducing the overhead added to the network.

The base station or the paging controller can 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 can transmit the PG_LU timer information and the paging group information to the mobile terminal in a unicast or broadcast manner during the idle mode operation. Thus, the base station or paging controller may transmit a paging message at a first paging offset or a second paging offset if there is a call or downlink data to the mobile terminal. These operations are described in detail in FIGS.

Embodiments of the present invention may be implemented by 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 embodiments of the present invention may be implemented in the form of a module, a procedure or a function for performing the functions or operations described above. For example, the software code may be stored in memory units 780,790 and may be driven by processors 720,730. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various means already known.

Also, in embodiments of the present invention, the base station may be a serving base station (first base station) or a second base station. The concepts of the first base station and the second base station are relative, and the serving base station refers to a base station providing a service when the mobile terminal enters the idle mode.

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention. In addition, claims that do not have an explicit citation in the claims may be combined to form an embodiment or be included in a new claim by amendment after the filing.

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

1 is a diagram showing an example of a paging group composed 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 location update timer (PG_LU Timer) used in embodiments of the present invention.

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

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

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

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

Claims (20)

A method for performing an idle mode operation in a mobile station (MS) to which one or more paging groups are assigned, Sending a deregistration request message to the first base station, the deregistration request message including mobility information indicating the mobility level indicating the mobility level of the MS, requesting initiation of the idle mode; Receiving a de-registration command message including paging group information from the first base station, the paging group information including a primary paging group identifier and a primary paging offset for a primary paging group assigned to the MS, A secondary paging group identifier and a secondary paging offset for the assigned secondary paging group; And Activating a paging group location update timer after moving from the primary paging group to the secondary paging group, Wherein the primary paging group and the secondary paging group are set based on the mobility information, Wherein the mobility information indicates the mobility level of the MS as one of fast, medium, or slow. The method according to claim 1, Monitoring a paging message at the primary paging offset; And And monitoring the paging message at the secondary paging offset if the paging message is not received at the primary paging offset. The method according to claim 1, Further comprising performing a paging group location update to inform the mobility information of the MS after the paging group location update timer has expired. The method according to claim 1, Wherein the paging group offsets and the paging group identifiers are allocated according to the number of paging groups assigned to the MS. A method for supporting idle mode operation of a mobile station (MS) to which one or more paging groups are assigned, Receiving a deregistration request message including mobility information requesting initiation of the idle mode and indicating a mobility level indicative of a moving speed of the MS; And Transmitting a de-registration command message including paging group information to the MS, the paging group information including a primary paging group identifier and a primary paging offset for a primary paging group assigned to the MS, A secondary paging group identifier for the secondary paging group, and a secondary paging offset for the secondary paging group, Wherein the primary paging group and the secondary paging group are set based on the mobility information, Wherein the mobility information indicates the mobility level of the MS as one of fast, medium, or slow. 6. The method of claim 5, Wherein the deregistration command message further comprises paging group location update timer information set based on the mobility information. 6. The method of claim 5, And sending a paging message to the MS at the primary paging offset. A mobile terminal (MS) to which one or more paging groups are assigned for performing idle mode operation, A transmitter configured to transmit a message; A receiver configured to receive a message; And And a processor configured to control the idle mode operation of the MS, Wherein the transmitter is configured to send a deregistration request message to the first base station, the deregistration request message including mobility information indicating a mobility level indicating a movement speed of the MS requesting initiation of an idle mode; Wherein the receiver is configured to receive a deregistration command message including paging group information from the first base station, the paging group information including a primary paging group identifier for a primary paging group assigned to the MS, And a secondary paging group identifier and a secondary paging offset for a secondary paging group allocated to the MS; And Wherein the processor is configured to activate a paging group location update timer after the MS moves from the primary paging group to the secondary paging group, Wherein the primary paging group and the secondary paging group are set based on the mobility information, Wherein the mobility information indicates the mobility level of the MS as one of fast, medium or slow. 9. The method of claim 8, Wherein the processor is further configured to monitor a paging message at the primary paging offset and to monitor a paging message at the secondary paging offset if the paging message is not received at the primary paging offset. 9. The method of claim 8, Wherein the processor is further configured to perform a paging group location update to inform the mobility information of the MS after the paging group location update timer has expired. 9. The method of claim 8, Wherein the paging group offsets and the paging group identifiers are allocated according to the number of paging groups assigned to the MS. A base station for supporting idle mode operation of a mobile station (MS) to which one or more paging groups are assigned, A processor configured to support the idle mode operation of the MS; A receiver configured to request initiation of an idle mode and to receive a deregistration request message including mobility information indicating a mobility level indicative of a movement speed of the MS; And And a transmitter configured to transmit a deregistration command message including paging group information to the MS, Wherein the paging group information includes a primary paging group identifier and a primary paging offset for a primary paging group assigned to the MS and a secondary paging group identifier and a secondary paging offset for a secondary paging group allocated to the MS, Wherein the primary paging group and the secondary paging group are set based on the mobility information, Wherein the mobility information indicates the mobility level of the MS as fast, medium or slow. 13. The method of claim 12, Wherein the deregistration command message further comprises paging group location update timer information set based on the mobility information. 13. The method of claim 12, Wherein the transmitter is further configured to transmit a paging message to the MS at the primary paging offset. delete delete delete delete delete delete

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