KR101719993B1 - Method and apparatus of transmitting and receiving system information in a wireless system - Google Patents

Abstract

The present invention relates to a system and method for transmitting and receiving system information in a wireless communication system. A method of receiving system information in a terminal of a wireless communication system according to an aspect of the present invention includes receiving a secondary SFH (S-SFH) change period from a base station, A primary superframe header information element (P-SFH IE) including a first field indicating the number of times of change of an information element (secondary super frame header subpacket information element, S-SFH SP IE) Each of the plurality of S-SFH SP IEs is not changed during one or more S-SFH change period periods once changed.

Description

TECHNICAL FIELD [0001] The present invention relates to a system and method for transmitting / receiving system information in a wireless communication system,

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving system information in a wireless communication system.

First, a super-frame header (SFH) will be described.

The base station transmits the system information to the terminals through the SHF. The SFH is located in the first subframe in one superframe. The SFH is divided into a main SFH (primary SFH) and a secondary super-frame header (secondary SFH, S-SFH).

Table 1 shows the format of the P-SFH IE (information element).

The P-SFH IE is transmitted every superframe and includes information related to the 4-bit least significant bit (LSB) information of the super frame number (SFN) and the S-SFH IE. The information related to the S-SFH IE includes an S-SFH change count (S-SFH change count) indicating the currently transmitted S-SFH version, a secondary super frame header subpacket information SFH size indicating the number of LRUs allocated for S-SFH transmission (S-SFH size), S (S-SFH size) indicating S-SFH transmission, An S-SFH number of repetitions indicating the transmission format of the SFH, and an S-SFH SP change bitmap indicating which S-SFH SP IE has been changed. The size of the S-SFH SP change bitmap field is equal to the total number of S-SFH SP IEs.

Table 2 shows the format of the S-SFH IE. S-SFH carries actual system information, and system parameters and system configuration information transmitted through S-SFH are classified into S-SFH SP1 IE, S-SFH SP2 IE, and S-SFH SP3 IE. The S-SFH SP1 IE includes information for network reentry, and the S-SFH SP2 IE includes information for an initial network entry and network discovery, and the S-SFH The SP3 IE contains the remaining essential system information for network (re) entry.

Each of the S-SFH SP1 IE, the S-SFH SP2 IE and the S-SFH SP3 IE is transmitted with different periods at different times. Table 3 shows the transmission periods of the S-SFH SP1 IE, the S-SFH SP2 IE and the S-SFH SP3 IE, and the transmission period of the S-SFH SP1 IE, the S-SFH SP2 IE and the S- SP3 IE.

Next, a method of updating the information of the S-SFH SP IE (secondary super frame header subpacket information element) will be described.

The UE receives the P-SFH IE and confirms the S-SFH change count field. The base station increments the value of the S-SFH change count field by 1 each time the S-SFH IE information is updated (changed).

If the S-SFH change count value is different from the S-SFH change count value, the UE determines that the S-SFH SP IE is updated (changed), checks the S-SFH SP change bitmap of the P- Is updated (changed).

Then, the S-SFH scheduling information is checked in the P-SFH IE to check which S-SFH SP IE is currently transmitted in the super frame. When the S-SFH SP IE to be updated (stored and updated) in the current SFH is transmitted, the corresponding S-SFH SP IE is checked and updated (stored and updated). If the S-SFH SP IE to be updated (stored and updated) in the current SFH is not transmitted, the S-SFH SP IE is received and updated in the next cycle in which the S-SFH SP IE to be updated (stored and updated) (Stored and updated).

According to the related art, since the terminal decodes the P-SFH every super frame and checks the S-SFH change count to check whether the S-SFH SP IEs are changed, power consumption of the terminal increases.

Next, the sleep mode operation according to the prior art will be described with reference to Fig. A mobile terminal communicates with a base station in a normal mode or an active mode and transmits a sleep request (hereinafter referred to as "AAI_SLP-REQ") message when there is no traffic to be transmitted / To the base station and requests a transition to a sleep mode. The base station transmits a sleep response (hereinafter referred to as "AAI_SLP-RSP") message to the mobile station in response to the AAI_SLP-RSP message. The mobile station receiving the AAI_SLP-RSP message transmits a sleep cycle, And transitions to the sleep mode by applying a sleep parameter such as a listening window. In addition, the base station may transmit an unsolicited AAI_SLP-RSP message to the mobile station so that the mobile station can transition to the sleep mode.

1 is a diagram illustrating a sleep mode operation of a terminal according to the prior art. As shown in FIG. 1, the MS transitions from a normal mode to a sleep mode, and then operates in a sleep mode by applying an initial sleep cycle. After transitioning to the sleep mode, the first sleep cycle includes only a sleep window.

After the first sleep cycle, the UE operates the sleep mode by applying the sleep cycle including the sleep interval and the sleep interval from the second sleep cycle. When the MS receives a traffic indication (hereinafter referred to as "TRF-IND") message including a negative indication during the listening interval, the MS determines that there is no traffic transmitted in the downlink and doubles the current sleep cycle . After completing the doubling of the sleep cycle, if the UE receives a TRF-IND message including a positive indication during the listening interval of the next sleep cycle, the UE resets the current sleep cycle to the initial sleep cycle.

The terminal in the sleep mode must have the latest system information transmitted through the SFH for smooth communication with the base station. However, if the frame through which the P-SFH is transmitted exists within the sleep interval of the UE, there is a problem that the P-SFH can not be received.

As described above, according to the related art, since the terminal decodes the P-SFH every super frame to check whether the S-SFH SP IEs are changed, the power consumption of the UE increases. In the case of a terminal operating in the sleep mode, there is a problem that the P-SFH can not be received if the frame through which the P-SFH is transmitted exists in the sleep interval of the terminal.

It is an object of the present invention to provide a system information transmission / reception method capable of reducing power consumption of a terminal.

It is another object of the present invention to provide a system information transmitting / receiving method that enables a terminal operating in a sleep mode to efficiently receive system information.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided a method for receiving system information in a terminal of a wireless communication system, the method comprising: receiving a secondary SFH (S-SFH) A primary SFH information element (P-SFH) including a first field indicating the number of times the secondary superframe header subpacket information element (S-SFH SP IE) IE), and each of the plurality of S-SFH SP IEs is not changed during one or more S-SFH change period periods once changed.

At this time, the value of the first field may be changed only in a superframe in which a remainder obtained by dividing a superframe number (SFN) by the S-SFH change period is a predetermined number.

Also, the S-SFH change period may be transmitted through one of the plurality of S-SFH SP IEs.

Also, if the value of the first field is different from the number of S-SFH changes stored in the UE, the UE can receive and update at least one S-SFH SP IE among the plurality of S-SFH SP IEs have.

Also, if the difference between the value of the first field and the number of S-SFH changes stored in the UE is 1, the terminal determines the S-SFH SP change bitmap (S-SFH SP) included in the P- the S-SFH SP change bitmap may be updated by receiving and updating only the S-SFH SP IE having a bit of 1, and the S-SFH SP change bitmap may indicate whether or not each of the plurality of P-SFH SP IEs is changed.

Also, the UE can receive and update all of the plurality of S-SFH SP IEs if the difference between the value of the first field and the number of S-SFH changes stored in the UE is greater than one.

In addition, the UE determines whether the at least one S-SFH SP IE is the latest one of the next superframes after being regularly scheduled and transmitted for a predetermined number of times for each of the at least one S-SFH SP IE, And can simultaneously apply information included in the at least one S-SFH SP IE in a super frame.

In addition, the P-SFH IE may further include a second field indicating S-SFH SP IEs applied in a super frame in which the P-SFH IE is transmitted.

According to another aspect of the present invention, there is provided a method for transmitting system information in a base station of a wireless communication system, the method comprising: transmitting a secondary SFH (S-SFH) A primary SFH information element including a first field indicating a number of times of change of a plurality of secondary super frame header subpacket information elements (S-SFH SP IEs) P-SFH IE), and each of the plurality of S-SFH SP IEs does not change during one or more S-SFH change period periods once changed.

In order to achieve the above object, a terminal of a wireless communication system according to another aspect of the present invention includes a secondary SFH (S-SFH) change period and a plurality of secondary superframe header subpacket information elements a primary SFH information element (P-SFH IE) including a first field indicating a number of times of change of a superframe header information, a superframe header subpacket information element, and a S-SFH SP IE, Each of the plurality of S-SFH SP IEs is not changed during one or more S-SFH change period periods once changed.

In order to achieve the above object, a base station according to another aspect of the present invention provides a terminal with a secondary SFH (S-SFH) change period and a plurality of secondary super frame header subpacket information elements (S-SFH IE) including a first field indicating a number of times the S-SFH information element (S-SFH IE) has changed, Each of the SFH SP IEs does not change during one or more S-SFH change period periods once changed.

According to another aspect of the present invention, there is provided a terminal including a central processing unit (CPU) for controlling the operation of the terminal, a memory for storing information related to communication with the base station, And a communication module for controlling communication of a secondary super frame header (S-SFH) and a plurality of secondary super frame header subpacket information elements and a primary SFH information element (P-SFH IE) including a first field indicating the number of changes of the S-SFH IE, Each SFH SP IEs are not changed during one or more S-SFH change period periods once they are changed.

According to another aspect of the present invention, a base station includes a central processing unit (CPU) for controlling operations of the base station, a memory for storing information related to communication, and a communication module (S-SFH) change period and a plurality of secondary super frame header subpacket information elements (S-SFH SP IEs) to the UE, And a transmission module for transmitting a primary SFH information element (P-SFH IE) including a first field indicating a number of times of change of the S-SFH SP IEs The change does not change during one or more S-SFH change cycle periods.

According to embodiments of the present invention, each time a plurality of S-SFH SP IEs are changed, the S-SFH SP IEs are not changed during one or more S-SFH change period periods, -SFH IE is decoded to confirm whether or not the S-SFH SP IEs are changed, so that power consumption of the UE can be reduced.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a diagram illustrating a sleep mode operation of a terminal according to the prior art.
2 is a flowchart illustrating a system information receiving method of a terminal according to an embodiment of the present invention.
3 is a diagram illustrating an application time point when one S-SFH SP IE is changed in one transmission period.
4 is a diagram illustrating application points when a plurality of S-SFH SP IEs are changed in one transmission period.
5 is a view showing an application time point according to the second method.
6 is a view showing an example of application time according to the third method.
7 is a view showing another example of the application time according to the third method.
FIG. 8 is a view showing the application time according to the fourth method.
FIG. 9 is a view showing an example of application time according to the fifth method, and FIG. 10 is a view showing another example of application time according to the fifth method.
11 is a flowchart illustrating an operation of a UE according to a sixth method.
12 is a view showing an example of application time according to the sixth method.
13 is a view showing another example of the application time according to the sixth method.
FIG. 14 is a diagram showing another example of the application time according to the sixth method.
15 is a diagram showing that the S-SFH SP2 IE is transmitted irregularly.
16 is a diagram showing a configuration of a mobile terminal and a base station in which embodiments of the present invention can be implemented.

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. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. For example, although the following detailed description assumes that the mobile communication system is a 3GPP2 802.16 system, it is applicable to any other mobile communication system except for the specific aspects of the 3GPP2 802.16 system.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

In the following description, it is assumed that the UE collectively refers to a mobile stationary or stationary user equipment such as a UE (User Equipment) and an MS (Mobile Station). It is also assumed that the base station collectively refers to any node of a network end that communicates with a terminal such as a Node B, an eNode B, and a base station.

A system information transmitting / receiving method according to an embodiment of the present invention will be described with reference to the drawings.

According to an exemplary embodiment of the present invention, a UE determines a secondary super frame header subpacket information element (S-SFH) stored in the UE in consideration of an S-SFH change cycle SFH IEs) are decoded whenever a validity check of the S-SFH IEs is required to confirm whether the S-SFH SP IEs are changed.

2 is a flowchart illustrating a system information receiving method of a terminal according to an embodiment of the present invention.

As shown in FIG. 2, the terminal receives the S-SFH change period from the base station (S210). At this time, the UE can receive the S-SFH change period through the S-SFH SP3 IE.

The S-SFH change period means a minimum interval during which the S-SFH does not change. Each of the plurality of S-SFH SP IEs may be changed only once during the S-SFH change period. That is, each of the plurality of S-SFH SP IEs is not changed during one or more S-SFH change period periods once changed. The S-SFH change period may be set for all of a plurality of S-SFH SP IEs or for each of a plurality of S-SFH SP IEs.

The S-SFH change period may be expressed in units of time (for example, ms), or may be expressed in units of superframes. If the S-SFH change period is set for each of the plurality of S-SFH SP IEs, the corresponding S-SFH SP IE may be expressed as the total number of S-SFH SP IEs transmitted during the S-SFH change period.

When the S-SFH change period is set for all of the plurality of S-SFH SP IEs, the S-SFH information element (primary SFH information element, P-SFH IE) The SFH change count (S-SFH change count) may increase only once during the S-SFH change period. At this time, the number of S-SFH changes may be increased only in the specific superframes determined according to the change period and the superframe number (SFN). For example, when the S-SFH change period is set in the superframe unit, the S-SFH change number can be increased only in the superframe having the SFN whose SFN modulo S-SFH change cycle satisfies a specific number. A particular number can be zero. Then, if the S-SFH changing period is 32, the number of S-SFH changing times can be increased only in a superframe where SFN is a multiple of 32. [

The changed S-SFH SP IE is transmitted through the superframes scheduled for the changed S-SFH SP IE among the superframes coming after the superframe in which the number of S-SFH changes is changed and the number of S-SFH changes is changed do.

Next, referring to the case where the S-SFH change period is set for each of the plurality of S-SFH SP IEs, the base station uses the S-SFH change period and the SFN for each of the plurality of S-SFH SP IEs And the corresponding S-SFH SP IE can be changed at the determined time. That is, the S-SFH SP IE can be changed in a superframe satisfying 'f (SFN, S-SFH change period) = x'. At this time, x may be predefined as a specific number, or may be transmitted via S-SFH. And x must be less than (transmission period of the corresponding S-SFH SP IE / interval of one superframe). For example, if the transmission period of the S-SFH SP1 IE is 40ms and the interval of one super frame is 20ms, x should be less than 2. Hereinafter, it is assumed that a section of one superframe is 20 ms.

SFH mod (S-SFH change period * S-SFH SP IE transmission period / 20) when the S-SFH change period is expressed as the total number of S-SFH SP IEs transmitted during the S-SFH change period. SFH SP IE can be changed only in a superframe having SFNs satisfying a specific number. For example, if the transmission period of the S-SFH SP1 IE is 40 ms, the modification period is 3, and the S-SFH modifier (S-SFH change period * S-SFH SP IE transmission period / 20 ms) If the SFH SP1 IE can be changed, the S-SFH SP1 IE may be changed in a superframe with SFNs of 1, 7, 13, 19, and so on.

If the S-SFH change period is expressed in units of time (ms), the S-SFH SP IE can be changed only in the superframe having the SFN whose SFN mod (S-SFH change period / 20 ms) have. At this time, the S-SFH change period should be an integral multiple of the S-SFH SP IE transmission period. For example, if the S-SFH SP1 IE change period is 80 ms and the S-SFH SP1 IE can be changed for each super frame that satisfies 'SFN mod (S-SFH change period / 20 ms) = 1' -SFH SP1 IE can be changed in SFN 1, 5, 9, 13 super frame and so on.

When the S-SFH change period is expressed in superframe units, the S-SFH SP IE can be changed only in a superframe having an SFN whose SFN mod S-SFH change period satisfies a certain number. In this case, the S-SFH change period should be an integer multiple of the transmission period of the corresponding S-SFH SP IE expressed by the number of superframes. For example, if the S-SFH SP1 IE of the S-SFH SP1 IE is changed every superframe satisfying the SFN mod S-SFH changing period = 4 and the SFN mod S-SFH changing period = 1, The SP1 IE can be changed in SFNs 1, 5, 9, and 13 superframes.

Referring back to FIG. 2, the UE receives a P-SFH IE including an S-SFH change count field (S220). The S-SFH change frequency field indicates the number of changes, i.e., the version, of the S-SFH SP IEs transmitted in the current S-SFH change period. If at least one of the S-SFH SP IEs is changed, the number of S-SFH changes increases.

Since the UE knows the S-SFH change period, the UE decodes the P-SFH IE every time the S-SFH SP IEs stored in the UE need to be validated and stores the S-SFH change frequency field of the P-SFH SP IE And the number of S-SFH changes stored in the UE can be compared with each other.

If the number of S-SFH changes can be changed only in certain superframes determined according to the change period and the SFN, the terminal can calculate a superframe in which the number of S-SFH changes can be changed using the SFN and the S-SFH change period have.

The UE operating in the normal mode can determine whether the S-SFH SP IEs are changed by decoding the P-SFH IE in the calculated superframe.

When the calculated superframe is included in the sleep window, the UE operating in the sleep mode transmits the P-SFH including the changed S-SFH change frequency just before the listening window, And can receive the P-SFH IE. For example, if there are superframes z and z + n that can change the number of S-SFH changes in the sleep interval, the UE does not occur in the superframe z but occurs in the superframe z + n, can do. If the computed superframe is not included in the sleep window, it does not need to happen. This is because the base station can change the S-SFH IE only once within the above-mentioned change period. That is, it means that the S-SFH IE has not been changed while the UE is in the sleep interval.

Then, the terminal receives and updates the S-SFH SP IE (S230).

If the value of the S-SFH change frequency field of the P-SFH SP IE is different from the S-SFH change frequency stored in the UE, the UE receives and updates at least one of the S-SFH SP IEs, The SF does not decode the S-SFH SP IE until the value of the S-SFH change frequency field is changed and the value of the S-SFH change frequency field is changed.

If the difference between the value of the S-SFH change frequency field of the P-SFH SP IE and the S-SFH change frequency stored in the UE is 1, the UE generates an S-SFH SP change bitmap (S- SP change bitmap) is 1 and updates the S-SFH SP IE. The S-SFH SP change bitmap indicates whether or not each of the plurality of S-SFH SP IEs is changed. That is, if the S-SFH SP change bitmap field is 'XYZ', Z indicates whether the S-SFH SP1 is changed, Y indicates whether the S-SFH SP2 is changed, and X indicates whether or not the S- . For example, Z = 1 indicates that S-SFH SP1 has been changed; 0 indicates that S-SFH SP1 has not changed; Y = 1 indicates that S-SFH SP2 has been changed; If X is 1, S-SFH SP3 is changed. If X is 0, S-SFH SP3 is not changed.

If the difference between the value of the S-SFH change count field of the P-SFH SP IE and the S-SFH change count stored in the UE is greater than 1, the UE receives and updates all the S-SFH SP IEs.

Then, the terminal applies the contents included in the changed S-SFH SP IE from a specific point in time (S240).

When the S-SFH SP IE is changed, the base station and the terminal apply the content included in the changed S-SFH SP IE from a specific point in time.

In the embodiment of the present invention, six methods for determining a specific time point at which the contents included in the changed S-SFH SP IE are applied are proposed.

First, a first method of determining a specific time point at which the content included in the changed S-SFH SP IE is applied will be described. According to the first method, the content included in the changed S-SFH SP IE is applied from a specific super frame determined by the super frame in which the S-SFH SP IE is changed. That is, after regularly scheduled transmissions of a certain number of changed S-SFH SP IEs from the superframe determined by the above-mentioned calculation formula, the contents included in the changed S-SFH SP IE in the immediately following superframe can be applied have. This is to ensure the time for the UEs to receive the changed S-SFH SP IE. At this time, the predetermined number of times may be defined in advance as a fixed value or dynamically determined by the base station.

For example, when the S-SFH SP1 IE is changed, the number of S-SFH change IEs in the superframe determined by the above-mentioned calculation formula is increased by one. After two regularly scheduled transmissions of the changed SF- The contents included in the modified S-SFH SP IE in the next superframe can be applied. If the S-SFH SP2 IE is changed, the next S-SFH SP2 IE is transmitted immediately after the two regularly scheduled transmissions of the changed S-SFH SP2 IE after the S-SFH change count field is incremented by 1 in the superframe determined by the above- The contents included in the changed S-SFH SP IE in the superframe coming in the S-SFH SP IE can be applied. If the S-SFH SP3 IE is changed, the S-SFH change number field is incremented by 1 in the superframe determined by the above-mentioned calculation formula, and then immediately after one regularly scheduled transmission of the changed S- The contents included in the changed S-SFH SP IE in the superframe coming in the S-SFH SP IE can be applied.

When a plurality of S-SFH SP IEs are changed in one S-SFH change period, the information included in the changed S-SFH SP IEs is transmitted to each of a plurality of S-SFH SP IEs, And the last one in the superframe. That is, after each of the plurality of S-SFH SP IEs is regularly scheduled and transmitted a predetermined number of times for each of a plurality of S-SFH SP IEs, a plurality of S- The information contained in the S-SFH SP IE is applied at the same time.

The base station may include an S-SFH application hold indicator in the P-SFH and transmit the S-SFH application hold indicator to the mobile station. The S-SFH application indicator indicates the content of the S-SFH SP IEs related to the number of S-SFH changes in the current superframe. That is, if the S-SFH application indicator is set to 0, it indicates that the contents of the S-SFH SP IEs related to the number of S-SFH changes included in the P-SFH transmitted in the current superframe are applied in the current superframe. If the apply indicator is set to 1 (indicating the number of S-SFH changes -1 included in the P-SFH transmitted in the current superframe), the content of the S-SFH SP IEs associated with the current superframe may be applied.

3 is a diagram illustrating an application time point when one S-SFH SP IE is changed in one transmission period.

3 shows that the S-SFH change period is 16, the S-SFH SP1 IE is changed, and the S-SFH SP1 IE changed since the S-SFH change frequency field is incremented by 1 in the superframe determined by the above-mentioned calculation formula SFH SP1 < / RTI > is applied to the next superframe after the second transmission of the S-SFH SP1 IE.

In FIG. 3, CC indicates the number of S-SFH changes, CB indicates an S-SFH SP change bitmap, SI indicates S-SFH scheduling information, and Flag indicates an S-SFH application indicator. The applied S-SFH count indicates the number of S-SFH changes associated with the S-SFH SP IEs applied in the corresponding superframe, and is not included in the P-SFH IE.

3, the number of S-SFH changes in the superframe whose SFN is 16 determined by the above-mentioned calculation formula is changed from 0 to 1, the S-SFH SP change bitmap is set to '001', and S- Indicates that the IE has changed. Then, the changed S-SFH SP1 IE is transmitted in the superframes having the SFNs 17 and 19. Then, the content of the changed S-SFH SP1 IE is applied from the superframe with SFN 20.

FIG. 4 is a diagram showing application points when a plurality of S-SFH SP IEs are changed in one S-SFH change period.

4 shows that the S-SFH change period is 16 and the S-SFH SP1 IE and the S-SFH SP2 IE are changed after the S-SFH change number field is increased by 1 in the superframe determined by the above-mentioned calculation formula, After the S-SFH SP1 IE is transmitted 2 times, immediately after the next superframe and the changed S-SFH SP2 IE are transmitted 2 times, the S-SFH SP1 IE and the S-SFH SP2 IE are changed from the last superframe of the next superframe Indicates that the included contents are simultaneously applied.

4, the number of S-SFH changes in the superframe whose SFN is 16 determined by the above-mentioned calculation formula is changed from 0 to 1, the S-SFH SP change bitmap is set to '011', and S- IE and S-SFH SP2 IE is changed. The changed S-SFH SP1 IE is transmitted in superframes with SFNs 17 and 19, and the changed S-SFH SP2 IE is transmitted in superframes with SFNs 18 and 22. Therefore, immediately after the changed S-SFH SP1 IE is transmitted 2 times, the next superframe is a superframe with the SFN of 20, and the next superframe after the changed S-SFH SP2 IE is transmitted 2 times is the superframe with the SFN of 23 to be. Therefore, the contents of the changed S-SFH SP1 IE and S-SFH SP2 IE are applied from the superframe having the SFN of 20 to the SFN of the SFN of 23, which is the later superframe of the SFN of 23.

Next, a second method for determining the specific time point at which the content included in the changed S-SFH SP IE is applied will be described. According to the second method, the base station notifies the UEs of the change of the S-SFH SP IEs to a specific reference point and informs the application point of time by using a flag. Then, the changed S-SFH SP1 IEs are simultaneously applied at the indicated application time point through the flag.

The specific reference point may be super frames that satisfy 'SFN mod x = 0'. In this case, when the S-SFH change period is expressed in units of time (ms), x is the S-SFH change period / 20 ms, and the S-SFH change period is the period during which the corresponding S-SFH SP IE is transmitted during the S- X is the S-SFH change period * S-SFH SP IE transmission period / 20, and when the S-SFH change period is expressed in superframe units, x is the S-SFH change period.

Table 4 shows a flag according to the second method when the S-SFH change period is represented by the total number of S-SFH SP IEs transmitted during the S-SFH change period.

Flag Description 00 Currently applied in superframe 01 Applied from a point that is separated from a certain reference point by {(period of change * S-SFH SP1 IE transmission period / 20ms) / 4} 10 Applied from a point that is separated from a specific reference point by {(period of change * S-SFH SP1 IE transmission period / 20ms) / 2} 11 Applied from a point that is separated from a certain reference point by {(change period * transmission period of S-SFH SP1 IE / 20ms) -1}

5 is a view showing an application time point according to the second method.

5 shows a case where the S-SFH change period is 32 superframes.

5, a specific reference point is superframes with SFNs of 32 and 64, the number of S-SFH changes is changed to 1 in a superframe with SFN 32, the S-SFH SP change bitmap is set to 011, SFH SP1 IE and S-SFH SP2 IE are changed. Since the flag is 10, the contents of the S-SFH SP1 IE and the S-SFH SP2 IE changed from the superframe of the 48-day SFN, which is a distance of 16 superframes from the specific reference point, are applied.

In the superframe with SFN 64, the number of S-SFH changes is changed to 2, and the S-SFH SP change bitmap is set to 001 to indicate that the S-SFH SP1 IE is changed. Since the flag is 01, the contents of the S-SFH SP1 IE changed from the superframe of 72 days SFN, which is a distance of 8 superframes from the specific reference point, are applied.

When the terminal having the S-SFH change count 0 stored therein receives the S-SFH change number 1 via the P-SFH, the terminal can know that the S-SFH SP IE has been changed. Since the difference between the number of S-SFH changes stored in the UE and the number of S-SFH changes received via the P-SFH is 1, the UE checks the S-SFH change bitmap and updates the S-SFH SP1 IE and the S- Is changed. Accordingly, the UE receives the changed S-SFH SP1 IE and the S-SFH SP2 IE at the time when the S-SFH SP1 IE and the S-SFH SP2 IE are transmitted. By checking the flag, the application time point of the changed S-SFH SP1 IE and the S-SFH SP2 IE can be known.

When the terminal having the number of S-SFH changes of 0 being stored receives the number of S-SFH change 2 through the P-SFH, the terminal can know that the S-SFH SP IE has been changed. The UE must receive all the S-SFH SP IEs because the difference between the number of S-SFH changes stored therein and the number of S-SFH changes received via the P-SFH is 2. Then, the UE checks the S-SFH change bitmap to find that the S-SFH SP IE changed in the S-SFH change period is the S-SFH SP1 IE. Then, it is possible to know the application time of the changed S-SFH SP1 IE by checking the flag, and it can be seen that the S-SFH SP2 IE and the S-SFH SP3 IE are already applied.

Next, a third method for determining a specific time point at which the content included in the changed S-SFH SP IE is applied will be described. According to the third method, the base station informs the UEs of the change of each of the S-SFH SP IEs within the S-SFH change period, and informs the application point of time by using a flag. Then, the changed S-SFH SP IEs are applied simultaneously to the application point indicated through the flag. At this time, whether or not each of the S-SFH SP IEs can be changed can be informed to the UEs in a superframe in which each S-SFH SP IE changed in the S-SFH change period is transmitted first.

The specific reference points are determined in the same manner as described in the second method, and the meaning of the flags is the same as in Table 4. [

6 is a view showing an example of application time according to the third method.

6 shows a case where the S-SFH change period is 32 superframes.

6, a specific reference point is superframes having SFNs of 32 and 64, and S-SFHs are changed in a superframe where the SFN is 33, which is a superframe in which the S-SFH SP1 IE changed first in the S-SFH change period is transmitted first. The number of times has been changed to 1, and the S-SFH SP change bitmap is set to 001 to indicate that the S-SFH SP1 IE has been changed. The number of S-SFH changes is changed to 2 and the S-SFH SP change bitmap is changed to 010 in the superframe where SFN 34, which is the superframe in which the changed S-SFH SP2 IE is first transmitted within the S-SFH change period, is 34 Indicates that the S-SFH SP2 IE has been set. Since the flag is 10, the contents of the changed S-SFH SP1 IE and S-SFH SP2 IE are applied from a point away from the specific reference point by 16 superframes.

The UE operating in the sleep mode may transmit the S-SFH SP1 IE, the S-SFH SP2, the S-SFH SP2 IE, and the S-SFH SP2 IE at the position where the S- IE 2 and S-SFH SP3 IE, respectively. For example, the terminal having the superframe number 43 in the listening interval determines whether or not the S-SFH SP3 IE is changed in the super frame 32, whether or not the S-SFH SP1 IE is changed in the super frame 33, -SFH SP2 IE can be changed or not. The UE can know that the S-SFH SP1 IE and the S-SFH SP2 IE 2 have been changed and that the contents of the changed S-SFH SP1 IE and S-SFH SP2 IE are applied from a point away from the specific reference point by 16 superframes have.

7 is a view showing another example of the application time according to the third method.

7 shows a case where the S-SFH change period is 32 superframes.

In FIG. 7, when the number of S-SFH changes for the first time increases within one S-SFH change period, only bits corresponding to the changed S-SFH SP IE in the S-SFH SP change bitmap are set to one. If the number of S-SFH changes increases within the S-SFH change period, the bit corresponding to the currently changed S-SFH SP IE in the S-SFH SP change bitmap is additionally set to 1.

7, if the S-SFH SP1 IE is changed in the superframe with the SFN of 5, the S-SFH SP change bitmap is set to 001. If the S-SFH SP2 IE is changed in the superframe with the SFN of 10, the S-SFH SP change bitmap is set to 011.

Next, a fourth method for determining a specific time point at which the content included in the changed S-SFH SP IE is applied will be described. According to the fourth method, the flags can be interpreted in different meaning according to the superframe. The content included in the changed S-SFH SP IE is applied simultaneously according to the corresponding flag value.

Table 5 shows the meaning of the flag according to the fourth method.

Flag Flag meaning in superframe where changed SP is not transmitted Flag meaning in superframe where changed SP is transmitted 00 S-SFH count applied in current superframe Apply to current superframe 01 S-SFH count - 1 is applied in current superframe Applied from a point separated by {Change cycle * SP1 cycle information / 20ms) / 4} from a specific reference point 10 S-SFH count - 2 is applied in current superframe Applied from a point that is separated from a specific reference point by {modification cycle * SP1 cycle information / 20ms) / 2} 11 S-SFH count - 3 is applied in current superframe Applied from a point that is separated from a specific reference point by {modification cycle * SP1 cycle information / 20ms) - 1}

When the number of S-SFH changes for the first time increases within one S-SFH change period, only bits corresponding to the changed S-SFH SP IE in the S-SFH SP change bitmap are set to one. If the number of S-SFH changes increases within the S-SFH change period, the bit corresponding to the currently changed S-SFH SP IE in the S-SFH SP change bitmap is additionally set to 1.

FIG. 8 is a view showing the application time according to the fourth method.

8 shows a case where the S-SFH change period is 32 superframes.

8, if the S-SFH SP1 IE is changed in the superframe with the SFN of 5, the S-SFH SP change bitmap is set to 001. If the S-SFH SP2 IE is changed in the superframe with the SFN of 10, the S-SFH SP change bitmap is set to 011. Since the flag is 10, the contents of the changed S-SFH SP1 IE and S-SFH SP2 IE are applied from a point away from the specific reference point by 16 superframes.

If the SFN of the current superframe is larger than the SFN of the application point indicated by the flag, it means that the changed S-SFH SP IE is already applied.

The flag of the superframe in which the S-SFH SP IE which causes the increase in the number of S-SFH changes within one S-SFH change period is transmitted indicates the application point of the changed S-SFH SP IE. The superframe in which the remaining S-SFH SP IEs are transmitted and the superframe in which the S-SFH SP IE is not transmitted indicate the number of S-SFH changes associated with the S-SFH SP IEs applied in the current superframe .

In Fig. 8, the hatched portion indicates a superframe indicating the number of S-SFH changes associated with the S-SFH SP IEs whose flags are currently being applied in the superframe.

If the S-SFH change period is different, the flag indicates the number of S-SFH change associated with the S-SFH SP IEs applied in the current superframe until the S-SFH change frequency increases.

Next, a fifth method for determining a specific time point at which the content included in the changed S-SFH SP IE is applied will be described. According to the fifth method, the flag can be interpreted in a different meaning according to the superframe, and the base station determines whether each changed S-SFH SP IE is changed in the S-SFH change period , And informs the UEs of the application time using a flag. Then, each modified S-SFH SP IE is applied independently at the indicated application time point through each flag value.

In the fifth method, certain reference points are determined in the same way as described in the second method.

When the number of S-SFH changes for the first time increases within one S-SFH change period, only bits corresponding to the changed S-SFH SP IE in the S-SFH SP change bitmap are set to one. If the number of S-SFH changes increases within the S-SFH change period, the bit corresponding to the currently changed S-SFH SP IE in the S-SFH SP change bitmap is additionally set to 1.

FIG. 9 is a diagram showing an example of application time according to the fifth method, and the meaning of the flags is shown in Table 5. FIG. 10 is a diagram showing another example of the application time according to the fifth method, and the meaning of the flags is shown in Table 6.

Table 6 shows the meaning of the flags used in FIG. 10 of the fifth method.

Flag Flag meaning in superframe where changed SP is not transmitted Flag meaning in superframe where changed SP is transmitted 00 S-SFH count applied in current superframe All modified SPs are applied to current superframe 01 S-SFH count - 1 is applied in current superframe Applied from a point separated by {Change cycle * SP1 cycle information / 20ms) / 4} from a specific reference point 10 S-SFH count - 2 is applied in current superframe Applied from a point that is separated from a specific reference point by {modification cycle * SP1 cycle information / 20ms) / 2} 11 S-SFH count - 3 is applied in current superframe Applied from a point that is separated from a specific reference point by {modification cycle * SP1 cycle information / 20ms) - 1}

FIGS. 9 and 10 show the case where the S-SFH change period is 32 superframes.

9 and 10, if the S-SFH SP1 IE is changed in the superframe with the SFN of 5, the S-SFH SP change bitmap is set to 001. If the S-SFH SP2 IE is changed in the superframe with the SFN of 10, the S-SFH SP change bitmap is set to 011.

If the SFN of the current superframe is larger than the SFN of the application point indicated by the flag, it means that the changed S-SFH SP IE is already applied.

The flag of the superframe in which the S-SFH SP IE which causes the increase in the number of S-SFH changes within one S-SFH change period is transmitted indicates the application point of each changed S-SFH SP IE. The superframe in which the remaining S-SFH SP IEs are transmitted and the superframe in which the S-SFH SP IE is not transmitted indicate the number of S-SFH changes associated with the S-SFH SP IEs applied in the current superframe .

9, the hatched portion indicates a super frame indicating the number of S-SFH changes associated with the S-SFH SP IEs whose flags are currently being applied in the superframe.

In FIG. 10, after each changed S-SFH SP IE is applied, the flag indicates the number of S-SFH changes associated with the S-SFH SP IEs applied in the current superframe. That is, in FIG. 10, the flag is set to 0 from the superframe in which the content of the S-SFH SP1 IE is applied from the SFN 8 and the S-SFH SP1 IE is transmitted from the corresponding SFN. Since all the changed S-SFH IEs are applied by applying the content of the changed S-SFH SP2 IE in the superframe with the SFN of 16, all the flags are set to 0 from the superframe with the SFN of 16. [

If the S-SFH change period is different, the flag indicates the number of S-SFH change associated with the S-SFH SP IEs applied in the current superframe until the S-SFH change frequency increases.

If the difference between the number of S-SFH changes stored in the UE and the number of S-SFH changes of the received P-SFH is 1, the UE receives only the S-SFH SP IE with the bit of the S- And if the difference between the number of S-SFH changes stored in the UE and the number of S-SFH changes in the received P-SFH is greater than 1, the UE receives and updates all the S-SFH SP IEs.

The UE can know the time at which the changed S-SFH SP1 IE is applied through the flag of the superframe in which the S-SFH SP1 IE is transmitted and can recognize the changed S-SFH SP2 IE through the flag of the superframe in which the S- Can be known. In addition, a flag of a superframe in which the S-SFH SP IE is transmitted and a flag in the superframe in which the S-SFH SP IE is not transmitted indicate whether the S-SFH SP IEs related to the number of S- Able to know.

9 and 10, since the flag of the superframe in which the changed S-SFH SP1 IE is transmitted is 01, the content of the changed S-SFH SP1 IE is applied from the superframe where the SFN is 8, which is 8 superframes apart from the specific reference point, Since the flag of the superframe through which the S-SFH SP2 IE is transmitted is 10, the content of the changed S-SFH SP2 IE is applied from the superframe where the SFN is 16, which is 16 superframes apart from the specific reference point.

Since the S-SFH SP1 IE and the S-SFH SP2 IE include permutation information and are related to each other, the number of S-SFH changes stored in the UE and the S-SFH change of the received P-SFH When the difference between the number of times is greater than 1, the UE must communicate with the BS after confirming all the application times of the S-SFH SP1 IE and the S-SFH SP2 IE. That is, the terminal must receive the transmitted S-SFH SP1 IE and wait to see the S-SFH SP2 IE even if it has already been applied.

Next, a sixth method for determining a specific time point at which the content included in the changed S-SFH SP IE is applied will be described. In the sixth method, it is assumed that each of the S-SFH SP IEs has a different S-SFH change period.

According to a sixth method, the base station increments the S-SFH change count by 1 each time each S-SFH SP IE is changed, and sets the bit corresponding to the changed S-SFH SP IE in the S-SFH SP change bitmap to 1 . Then, the bit of the S-SFH SP change bitmap corresponding to the S-SFH SP IE applied in the corresponding super frame is set to zero.

11 is a flowchart illustrating an operation of a UE according to a sixth method.

As shown in FIG. 11, the UE receives the P-SFH and compares the number of S-SFH changes stored in the UE with the number of S-SFH changes of the received P-SFH. If the number of S-SFH changes stored in the UE is equal to the number of S-SFH changes in the received P-SFH, the UE does not need to decode the S-SFH SP IEs and the number of S- If the number of S-SFH changes of the received P-SFH is different, the terminal must decode and update the S-SFH SP IEs.

If the difference between the number of S-SFH changes stored in the UE and the number of S-SFH changes of the received P-SFH is equal to the number of bits set to 1 in the S-SFH SP change bitmap of the P-SFH, The S-SFH SP IE corresponding to the bit set to 1 in the SFH SP change bitmap may be decoded and updated. If the difference between the number of S-SFH changes stored in the UE and the number of S-SFH changes of the received P-SFH is different from the number of bits set to 1 in the S-SFH SP change bitmap of the P-SFH, All S-SFH SP IEs are received and updated. At this time, when the UE can implicitly grasp the changed S-SFH SP IE using the change period, the S-SFH SP IE corresponding to the bit set to 1 in the S-SFH SP change bitmap and the implicitly grasped S-SFH It is possible to decode and update only the SP IE.

The UE can know the number of S-SFH changes related to the currently applied S-SFH SP IEs by using the number of S-SFH change times and the number of bits set to 1 in the S-SFH SP change bitmap. If the UE has the S-SFH SP IEs applied thereto, it can perform normal communication with the base station. If the UE does not have the S-SFH SP IEs applied thereto, after receiving and updating the S-SFH SP IEs, Communication can be performed.

12 is a view showing an example of application time according to the sixth method.

12, the base station applies the contents of S-SFH SP IEs related to the number of S-SFH changes 25 in the first superframe. The number of S-SFH changes applied in the corresponding superframe can be found as 'the number of S-SFH changes - the number of bits set to 1 in the S-SFH SP change bitmap'. That is, the number of S-SFH changes applied in the first super frame of FIG. 12 is 25 (25-0).

If the S-SFH SP1 IE is changed in the second superframe, the base station increases the number of S-SFH changes to 26 and sets the S-SFH SP change bitmap to 001. Therefore, the number of S-SFH changes applied in the second, third, and fourth superframes is 25 (26-1).

In FIG. 12, the content of the changed S-SFH SP1 IE is applied from the next superframe immediately after the changed S-SFH SP1 IE is transmitted 2 times. This is to apply the contents of the changed S-SFH SP1 IE after the changed S-SFH SP IE has been transmitted a certain number of times or more to guarantee the time for the terminals to receive the changed S-SFH SP IE. At this time, the predetermined number of times may be defined as a fixed value in advance or dynamically determined by the base station. Therefore, the content of the changed S-SFH SP1 IE in the fifth super frame is applied.

Then, the BS sets the bit corresponding to the changed S-SFH SP IE in the S-SFH SP change bitmap to 0 at the time when the changed S-SFH SP IE is applied, so that the S-SFH SP change bitmap is set to the fifth super It is set to 000 in the frame.

In FIG. 12, it is assumed that the number of S-SFH changes stored in the UE in the first superframe is 25. The UE determines the number of S-SFH changes applied in the first superframe by using the number of S-SFH changes in the first superframe and the number of bits set to 1 in the S-SFH SP change bitmap.

The UE compares the number of S-SFH changes received in the first superframe with the number of S-SFH changes stored in the UE and determines that the S-SFH SP IEs have not been changed. Since the number of S-SFH changes is 25 and the number of bits set to 1 in the S-SFH SP change bitmap is 0, it can be seen that the number of S-SFH changes applied in the first superframe is 25.

In the second superframe, the UE knows that the difference between the number of S-SFH changes received and the number of S-SFH changes stored in the UE is 1, indicating that the S-SFH SP IE is changed. Then, it can be seen that the S-SFH SP1 IE is changed through the S-SFH SP change bitmap and that the number of S-SFH change is 25 (26-1).

In the fifth super frame, the UE can know that the count applied is 26 (26-0).

13 is a view showing another example of the application time according to the sixth method.

In the first superframe, the base station sets the number of S-SFH changes to 26, which is an increment of 1, and sets the S-SFH SP change bitmap to 001, in order to change the S-SFH SP1 IE. The number of S-SFH changes applied in the first superframe is 25 (26-1).

If the S-SFH SP2 IE is changed in the second superframe, the base station sets the number of S-SFH changes to 27, which is incremented by 1, and sets the S-SFH SP change bitmap to 011. The number of S-SFH changes applied in the second, third, and fourth superframes is 25 (27-2).

When the contents of the changed S-SFH SP1 IE and the S-SFH SP2 IE are simultaneously applied, the base station sets the S-SFH SP change bitmap to 000 in the fifth superframe. Therefore, the number of S-SFH changes applied in the fifth superframe is 27 (27-0).

Alternatively, the base station may apply the contents of the changed S-SFH SP1 IE and the S-SFH SP2 IE to different points in time.

FIG. 14 is a diagram showing another example of the application time according to the sixth method.

In the first superframe, the base station sets the number of S-SFH changes to 27, which is increased by 2, and sets the S-SFH SP change bitmap to 011, in order to change the S-SFH SP1 IE and the S-SFH SP2 IE. The number of S-SFH changes applied in the first superframe is 25 (27-2).

When the contents of the changed S-SFH SP1 IE and the S-SFH SP2 IE are simultaneously applied, the base station sets the S-SFH SP change bitmap to 000 in the fifth superframe. Therefore, the number of S-SFH changes applied in the fifth superframe is 27 (27-0).

In the above description, S-SFH SP IEs are transmitted in a regularly scheduled transmission period. However, the S-SFH SP IEs may be transmitted irregularly in addition to the regularly scheduled transmission period.

15 is a diagram showing that the S-SFH SP2 IE is transmitted irregularly.

At this time, the S-SFH SP IE transmitted irregularly may be limited to the changed S-SFH SP IE. Also, when a plurality of S-SFH SP IEs are simultaneously changed, the S-SFH SP IE transmitted irregularly may be the S-SFH SP IE having the longest transmission period among the plurality of S-SFH SP IEs.

However, the UE may not know that an irregular transmission of the S-SFH SP IE is an irregular transmission.

If the UE does not receive the transmission period information through the S-SFH SP3 IE, the transmission period can be grasped implicitly from the point of time when the S-SFH SP IE is irregularly received to the point of reception of the next S-SFH SP IE have. Then, the UE may erroneously determine the transmission period of the S-SFH SP IE.

When the UE receives the transmission period information through the S-SFH SP3 IE, it determines that the S-SFH SP IE will be transmitted at a position spaced from the non-regular reception time of the S-SFH SP IE by the transmission period. Therefore, the UE may erroneously determine the transmission time point of the S-SFH SP IE.

Therefore, in the embodiment of the present invention, four methods are proposed to prevent the terminal from erroneously determining the transmission period of the S-SFH SP IE or the transmission time of the S-SFH SP IE due to the irregular transmission of the S-SFH SP IE .

According to the first method, the UE checks the P-SFH until it receives the S-SFH SP IEs having the same transmission period.

According to the second method, the base station explicitly informs whether the S-SFH is transmitted regularly or not via the P-SFH.

According to the third method, the BS explicitly informs whether the S-SFH SP IE is regularly transmitted or not through each S-SFH SP IE.

According to the fourth method, a specific value (0b1111) among the transmission period information of each S-SFH SP IE is used for informing that an irregular transmission is performed. At this time, the specific value needs to be defined in advance or the base station should inform the UEs in advance.

According to the fifth method, a specific value (0b1111) among the S-SFH SP scheduling information transmitted through the P-SFH is used for informing that irregular transmission is performed.

Two or more of the five methods described above can be applied simultaneously.

The changed S-SFH SP IE can be applied immediately after being transmitted N times in a regular period. At this time, irregular transmission is not included in N transmissions.

If the difference between the number of S-SFH changes of the UE and the number of S-SFH changes transmitted via the P-SFH is 2 or more and the changed S-SFH SP IE is the S-SFH SP3 IE, The point of view must be clearly identified. That is, since the transmission period may be changed in the changed S-SFH SP3 IE, the UE should monitor the P-SFH until the application time point information transmitted through the P-SFH is applied.

16 is a diagram illustrating a configuration of a mobile terminal and a base station in which the above-described embodiments of the present invention can be implemented, according to another embodiment of the present invention.

The mobile terminal (AMS) and the base station (ABS) may include an antenna capable of transmitting and receiving information, data, signals, and / or messages, a transmission module for controlling the antennas to transmit messages, (560, 570) for storing information related to communication, and a central processing unit (CPU) 540, 550 for controlling the communication module and the memory, respectively .

The CPUs 540 and 550 typically control the overall operation of the mobile terminal or base station. Particularly, the CPU has 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. The processors 540 and 550 may further include a cryptographic module for controlling encryption of various messages and a timer module for controlling transmission and reception of various messages, respectively.

The CPU 550 of the UE receives at least one S-SFH SP IE among a plurality of S-SFH SP IEs if the number of S-SFH changes of the P-SFH IE is different from the number of S- .

The transmission module may perform predetermined coding and modulation on signals and / or data to be transmitted to the outside and be transmitted to the antenna after being scheduled from the processor. The receiving module can decode and demodulate the radio signal received from the outside through the antenna, and restore it to the form of original data and transmit it to the CPU.

The transmission module of the base station transmits the P-SFH IE including the first field indicating the S-SFH change period and the number of changes of the plurality of S-SFH SP IEs to the UE.

The receiving module of the UE receives the P-SFH IE including the first field indicating the S-SFH change period and the number of changes of the plurality of S-SFH SP IEs from the base station.

The memories 560 and 570 may store a program for processing and controlling the processor and may store data input / output (in the case of a mobile station, UL grant, system information, station identifier 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.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The foregoing description of the preferred embodiments of the invention disclosed herein has been presented to enable any person skilled in the art to make and use the present invention. While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. For example, those skilled in the art can utilize each of the configurations described in the above-described embodiments in a manner of mutually combining them.

Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (25)

A method for a terminal of a wireless communication system to receive system information,
Receiving a secondary SFH (S-SFH) change period from the base station; And
A primary SFH information element including a first field indicating a number of times of change of a plurality of secondary superframe header subpacket information elements (S-SFH SP IEs) from the base station, , ≪ / RTI > P-SFH IE)
Wherein each of the plurality of S-SFH SP IEs does not change during one or more S-SFH change period periods once changed. The method according to claim 1,
The value of the first field is
Wherein a value obtained by performing a modulo operation on a superframe number (SFN) with the S-SFH change period is increased only within a superframe in which a predetermined number of values are calculated. 3. The method of claim 2,
Wherein the predetermined number is " 0 ". The method according to claim 1,
Wherein the S-SFH change period is indicated in the S-SFH SP3 IE. The method according to claim 1,
If the difference between the value of the first field and the number of S-SFH changes stored in the UE is 1, the UE determines that the S-SFH SP change bitmap has a S- SFH SP IE is updated,
Wherein the UE updates all of the plurality of S-SFH SP IEs if the difference between the value of the first field and the number of S-SFH changes stored in the UE is greater than one. The method according to claim 1,
The P-SFH IE
And a second field indicating S-SFH SP IEs applied in a superframe in which the P-SFH IE is transmitted. The method according to claim 1,
Wherein the UE does not decode the S-SFH SP IE if the value of the first field is equal to the number of S-SFH changes stored in the UE. In a terminal of a wireless communication system,
A first field indicating a change frequency of a secondary super frame header (secondary SFH, S-SFH) change period and a plurality of secondary super frame header subpacket information elements (S-SFH SP IEs) And a receiving module for receiving a primary SFH information element (P-SFH IE)
Wherein each of the plurality of S-SFH SP IEs is not changed during one or more S-SFH change period periods once changed. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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