KR101636399B1 - Apparatus and moethod for transmitting/receiving system information in broadband wireless communication system - Google Patents

Abstract

The present invention relates to transmission and reception of system information in a broadband wireless communication system, and the operation of a base station determines whether to apply a system configuration corresponding to a previous value of a change count, which is changed according to an update of system information Setting a parameter indicating a system configuration to be applied to a first value when applying a system configuration corresponding to a previous value of the change count and applying a system configuration corresponding to a current value of the change count; , Setting the parameter to a second value, and transmitting the change count and a primary super frame header (P-SFH) including the parameter set to the first value or the second value And notifies the terminal of the application time of the updated system information through the parameter, The operation disabled state can be minimized.

System information, a primary-super-frame header (P-SFH), a secondary-super-frame header (S-SFH), a sub-

Description

[0001] APPARATUS AND METHOD FOR TRANSMITTING / RECEIVING SYSTEM INFORMATION IN BROADBAND WIRELESS COMMUNICATION SYSTEM [0002] BACKGROUND OF THE INVENTION [0003]

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

Currently, mobile communication systems are being developed to provide various services such as broadcasting, multimedia image, and multimedia message in the existing voice communication. The next generation communication system includes IEEE (Institute of Electrical and Electronics Engineers) 802.16e system, 3GPP Long Term Evolution (LTE), IEEE 802.20 Ultra Mobile Broadband (UMB), and IEEE 802.16m system .

In order to support a high data rate in the mobile communication system, various transmission techniques such as a multi-antenna system, Hybrid Auto Repeat reQuest (HARQ), Adaptive Modulation and Coding (AMC) and the like are introduced. In order to operate these transmission schemes, the base station must transmit a large amount of system information to a plurality of user terminals. The system information includes common information of a network and a cell that a user terminal must know in order to perform mobile communication in a cell, for example, bandwidth information of a cell, configuration information of a physical channel, Information of a layer, parameters, and various transmission schemes supported in the cell, for example, number of transmission antennas, information on multiple antennas, HARQ related information, modulation scheme information, and the like.

According to the Institute of Electrical and Electronics Engineers (IEEE) 802.16m, which is one of the wireless communication standard standards, the system information is transmitted in the form of Primary-Super-Frame Header (P-SFH) and Secondary-Super Frame Header . The S-SFH is divided into SP1 (SubPacket1), SP2 and SP3, and the transmission periods of SP1, SP2 and SP3 may be different from each other. The P-SFH includes information indicating whether the S-SFH is transmitted in the same frame, which SP if transmitted, and what the size is. The P-SFH indicates a change in system information using an S-SFH change count and an S-SFH SP change bitmap, and indicates an S-SFH scheduling information bitmap. To indicate what SP is transmitted in the same frame.

 The S-SFH change count is mapped to the SPs to be transmitted. For example, when the S-SFH change count is N, the transmitted SP1, SP2, and SP3 include system parameters of 'S-SFH Change Count = N' state. Therefore, changing the change count means that at least one of the SPs of the S-SFH has been updated. The S-SFH SP change bitmap indicates which SP has changed. In addition, each SPx includes a two-bit offset parameter indicating the superframe offset at which the use of the changed SP begins, and informs when the new configuration changed via the offset parameter. Therefore, after receiving the new SPx, the terminal applies the new parameters in the superframe indicated by the offset parameter in the SPx.

The change count and change bitmap included in the P-SFH informs which system information has been updated and which SP has been updated. However, even if the terminal recognizes the updated SP and the updated SP by receiving the P-SFH, if the updated SPx is not received due to the channel deterioration, the sleep mode, or the like, The time of application of SPx is not known and communication should be stopped. Accordingly, the UE can not perform communication until the SPx is successfully decoded. Therefore, even if the updated SPx is not received, it is necessary to find an application time point of the updated SPx so that the terminal can perform communication until the updated system information is applied.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an apparatus and method for informing the application time of updated system information in a broadband wireless communication system.

It is another object of the present invention to provide an apparatus and method for informing the application point of updated system information through an IE (Information Element) transmitted every super frame in a broadband wireless communication system.

It is still another object of the present invention to provide an apparatus and method for updating SPs (SubPackets) of a plurality of system information at the same time in a broadband wireless communication system.

According to a first aspect of the present invention, there is provided a method of operating a base station in a broadband wireless communication system, the method comprising: applying a system configuration corresponding to a previous value of a change count, Setting a parameter indicating a system configuration to be applied to a first value when a system configuration corresponding to a previous value of the change count is applied; Setting a parameter to a second value when a system configuration is applied; and setting a P-SFH (Primary-Super Frame Header) including the change count and the parameter set to the first value or the second value And transmitting the data.

According to a second aspect of the present invention, there is provided a method of operating a terminal in a broadband wireless communication system, the method comprising: receiving a value of a parameter included in a P-SFH received through a superframe header, The method comprising the steps of: confirming a value of a change count changed according to an update of information; performing communication by applying a system configuration corresponding to a previous value of the change count when the value of the parameter is a first value; When the value of the change count is a second value, performing a communication by applying a system configuration corresponding to a current value of the change count.
According to a third aspect of the present invention, there is provided a method of operating a terminal in a broadband wireless communication system, the method comprising: receiving a change count change according to an update of system information included in a P-SFH received through a superframe header; Identifying at least one updated SP among the SPs of the S-SFH using the changed bitmap included in the P-SFH when the value of the change count is increased; Determining a transmission time point of one SP; determining a super frame to which a system configuration corresponding to a current value of the change count is applied using the transmission time point of the SP; when the super frame arrives, And performing communication by applying a system configuration corresponding to a current value of the change count.

According to a fourth aspect of the present invention, in a broadband wireless communication system, a base station apparatus determines whether to apply a system configuration corresponding to a previous value of a change count changed according to an update of system information, Setting a parameter indicating a system configuration applied when applying a system configuration corresponding to a previous value of the change count to a first value and setting the parameter to a second value when applying a system configuration corresponding to a current value of the change count, And a transmitter for transmitting the change count and the P-SFH including the parameter set to the first value or the second value.

According to a fifth aspect of the present invention, in a broadband wireless communication system, a terminal apparatus includes: a parameter value indicating a configuration of a system included in a P-SFH received through a super frame header; A manager for confirming a value of a change count to be changed according to an update and a system configuration corresponding to a previous value of the change count when the value of the parameter is a first value, And a controller for performing communication by applying a system configuration corresponding to a current value of the change count.
According to a sixth aspect of the present invention, in a broadband wireless communication system, a terminal apparatus confirms a change count changed according to an update of system information included in a P-SFH received through a superframe header , Identifies at least one SP updated among the SPs of the S-SFH using the change bitmap included in the P-SFH when the value of the change count is increased, and updates the transmission time point of the updated at least one SP A manager for determining a superframe to which a system configuration corresponding to a current value of the change count is applied using the transmission time point of the SP when the superframe arrives; And a controller for performing communication by applying the configuration.

By informing the terminal of the application time of the updated system information in the broadband wireless communication system, it is possible to minimize the operation disabled state due to the non-reception of the system information. Particularly, the present invention provides a terminal for restarting and resuming communication after temporarily stopping communication such as an idle mode or a sleep mode for recognizing a change in the system information and knowing when the changed system information is applied This is an effective plan.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, the present invention will be described with respect to a technique for informing the application time of updated system information in a broadband wireless communication system. Hereinafter, the present invention will be described by taking an example of a wireless communication system of Orthogonal Frequency Division Multiplexing (OFDM) / Orthogonal Frequency Division Multiple Access (OFDMA) , And can be similarly applied to other types of wireless communication systems.

FIG. 1 shows an example of a frame structure in a broadband wireless communication system according to the present invention.

Referring to FIG. 1, a super frame 100 is divided into a plurality of frames 110, and the frame 110 is divided into sub-frames 120 including a plurality of OFDM symbols 130. In the superframe 100, a first subframe of a first frame includes a superframe header 140, and the superframe header 140 includes a synchronization channel, a common control channel, . The superframe header 140 is an area for transmitting system information that is necessary for a terminal to perform communication with the corresponding base station. The system information is divided into P-SFH (Primary-Super Frame Header) and S-SFH (Secondary-Super Frame Header), and the S-SFH is divided into SP (SubPacket) 1, SP2 and SP3. For convenience of explanation, the present invention is collectively referred to as SP1, SP2 and SP3.

The P-SFH is always included in the superframe header 140, and the SPx is optionally included. For example, each SPx is transmitted according to the period. When the SPx is included, the SPx is mapped to a resource located consecutively in the resource occupied by the P-SFH. Accordingly, the UE can extract the SPx in the frame using the size information of the SPx included in the P-SFH. The P-SFH and each SPx are distinguished according to the type of parameters included therein, and the configuration of specific parameters of each IE (Information Element) may be changed according to the intention of the inventor of the present invention. For example, parameters included in the P-SFH and the SPx are shown in Table 1 to Table 4 below. Table 1 below shows parameters included in the P-SFH, Table 2 shows parameters included in the SP 1, Table 3 shows parameters included in the SP 2, ≪ RTI ID = 0.0 > SP3. ≪ / RTI >

parameter Explanation LSB of Superframe
number Part of superframe number S-SFH change count Describes the S-SFH SPx. S-SFH Size The units of LRU S-SFH Transmission
Format Indicate the transmission format (repetition) used for S-SFH S-SFH Scheduling
information bitmap 0b000: no S-SFH
If 1stbit = 1, S-SFH includes SP1 otherwise no SP1
If 2nd bit = 1, S-SFH includes SP2 otherwise no SP2
If 3rdbit = 1, S-SFH includes SP3 otherwise no SP3
Indicate the change of S-SFH SPxIE. The bit # 0 to bit # 2 is
mapped to S-SFH SP1 IE to S-SFH SP3 IE, respectively. S-SFH SP change bitmap Indicate which SPx is IE is updated.

parameter Explanation MSB of superframe number Remaining bits of SFN except LSB of SFN in P-SFH LSB of ABS ID Specifies the 24 least bits of ABS ID Periodicity of A-MAP 0b0: every subframe
0b1: every 2 subframes A-MAP transmission format 0b0: 1/2 or 1/4 code rate for assignment A-MAP
0b1: 1/2 or 1/8 code rate for assignment A-MAP DL permutation configuration
(CRU, DRU partitioning and
signaling related to that) DL_CAS_SB0 (4), DL_CAS_MB0 (6), DL CAS_SBi (4x3) (Up to 22 bits, Need the decision from DL physical structure section) UL permutation configuration
(CRU, DRU partitioning and
signaling related to that) UL_CAS_SB0 (4), UL_CAS_MB0 (6), UL CAS_SBi (4x3) (Up to 22 bits, Need the decision from DL physical structure section) Initial ranging channel
information (initial ranging
region location) (Need the decision from UL Ctrl section) RNG codes information Parameters for determining the root sequences and their cyclic shifts in the preamble set for the cell (Up to 12 bits, Need the decision from UL Ctrl section) HO ranging codes 64 RNG codes (Need the decision form UL Ctrl section) HO Ranging backoff start Initial backoff window size for HO ranging contention,
expressed as a power of 2. Values of n range 0-15 (the highest order bits shall be unused and set to 0) HO Ranging backoff end 2. The value of n range 0-15 (the highest order bits shall be unused and set to 0) (Need the decision from UL or MAC operation section) ABS EIRP Signed in units of 1 dBm Cell bar information If Cell Bar bit = 1, this cell is not allowed for any initial entry

parameter Explanation Duplexing mode Sub-frame configuration
(DL / UL ratio, duplexing mode) If (Duplexing mode == FDD) {
UL carrier frequency
UL bandwidth
} MSB bytes of BSID Specifies the Operator ID FFR partitioning info for DL
region DL_SAC (4), DL_FPSC (3), DL_FPC (4) (Up to 11 bits, Need the decision from DL Physical structure section) FFR partitioning info
for UL region UL_SAC (4), UL_FPSC (3), UL_FPC (4) (Up to 11 bits, Need the decision from UL Physical Structure section) Initial ranging codes 64RNG codes (Need the decision from UL Ctrl section) Initial ranging
backoff start Initial backoff window size for initial ranging contention, expressed as a power of 2. Values of n range 0-15 (Need the decision from UL Ctrl or MAC operation section) Bandwidth request backoff start The initial backoff window size for contention BRs, expressed as a power of 2. Values of n range 0-15 (the highest order bits shall be unused and set to 0) Bandwidth request
backoff end Final backoff window size for contention BRs, expressed as a power of 2. Values of n range) -15 (Need the decision from UL or MAC operation section) NSP ID Network service provider ID Additional broadcast
information indicator (ABI) AMS Transmit Power Limitation
Level Unsigned 8-bit integer. Specifies the maximum allowed AMS transmit power. Values indicate power levels in 1 dB steps starting from 0 dBm Minimum level of power offset adjustment Maximum level of power offset adjustment

parameter Explanation Rate of change of SP (1-3) info SA-sequence soft partitioning
information FFR partition resource metrics MIMO rank 1 OL region signaling MIMO rank 1 OL region NI information
for UL power control Periodic ranging channel
information (periodic ranging
region location) Need the decision from UL Ctrl section Periodic ranging codes 64RNG codes
(Need the decision from UL Ctrl section) Periodic ranging backoff start Initial value of n range 0-15 (Need for decision from UL or MAC operation section) Periodic ranging backoff end The final backoff window size for the periodic ranging content, expressed as a power of 2. Values of n range 0-15 (Need the decision from UL or MAC operation section) UL FB Size The UL subframe (UL subframe) #Tx antenna 0b00: 2 antennas
0b01: 4 antennas
0b10: 8 antennas
0b11: reserved Default RSSI and CINR
averaging paramter Bits 0-3: Default averaging parameter αavg for physical CINR measurements, in multiple of 1/16
Bits 4-7: Default averaging parameter αavg for RSSI
measurements, in multiple of 1/16 Tx Power report SP scheduling periodicity
information

The base station according to the embodiment of the present invention includes a configuration transition flag (CTF) in the P-SFH. The configuration change flag is a parameter indicating whether or not the system configuration corresponding to the current value of the change count (S-SFH change count) is applied, and is defined as shown in Table 5 below. The configuration change flag may be referred to by another name according to a specific embodiment. For example, the configuration transition flag may be referred to as an S-SFH application hold indicator.

Syntax Size
(bit) Notes Configuration Transition Flag One 0: Apply system configuration corresponding to current value of change count
1: Apply system configuration corresponding to previous value of change count

If the current value of the change count is 'N' and the configuration switching flag is '0', the terminal applies the system configuration corresponding to the change count 'N', that is, the system configuration according to the currently transmitted system information . On the other hand, when the current value of the change count is 'N' and the configuration change flag is '1', the UE transmits system information corresponding to the change count 'N-1' The system configuration according to the transmitted system information is applied.

As the P-SFH includes the configuration change flag, system information is transmitted and received as follows.

FIGS. 2A to 2C illustrate transmission timings of system information in a broadband wireless communication system according to an embodiment of the present invention.

2A shows a case where an updated SPx is transmitted along with an increase of the change counter. Referring to FIG. 2A, in interval 1 211, the change count is 'N' and the change bitmap is '0b000'. At this time, since the configuration switching flag is '0', the system configuration according to the SPx corresponding to the current value of the change count is applied. Therefore, the terminal that newly enters the base station receives the currently transmitted SPxs and applies the system configuration according to the received SPxs.

At interval 2 212, due to the update of SP2, the change count becomes 'N + 1', and the change bitmap becomes '0b010'. Here, the fact that the second bit of the change bitmap is changed to '1' in accordance with the update of the SP2 is a result according to a rule for notifying the update of the SPx. Here, the rule is one of toggling the bit corresponding to the updated SPx and setting the value of the bit corresponding to the updated SPx to '1'. Since the change count has increased, the UE recognizes that the system information has been updated, and determines that SP2 has been updated through the change bitmap. Also, since the SP2 is transmitted through the frame at the time when the change count is increased, the terminal obtains the updated system information by decoding the SP2, and stores the updated system information. However, since the configuration switching flag is '1', the system configuration currently applied depends on the system information when the change count is 'N'. Therefore, the terminal does not apply the stored SP2, and reflects the SP2 received in the interval 1 (211) to the system configuration.

In section 3 (213), the system information is not updated but the configuration switching flag is changed to '0'. Accordingly, the UE recognizes that the system configuration according to the changed system information is applied in the interval 2 (212), and applies the SP2 received and stored in the interval 2 (212). In FIG. 2A, the configuration change flag is changed to '0' in the interval 3 (213), but the change bitmap still maintains '0b010'. However, according to another embodiment of the present invention, the change bitmap may be initialized to '0b000' at the same time that the configuration change flag is changed to '0'.
In the embodiment shown in FIG. 2A, the system configuration corresponding to the current value of the change count is applied when the configuration change flag is changed to '0'. However, according to another embodiment of the present invention, the system configuration corresponding to the current value of the change count may be configured such that after a certain number of superframes have elapsed since the configuration change flag was changed to '0'Lt; / RTI >

FIG. 2B shows a case where the updated SPx is transmitted after the change counter is incremented. Referring to FIG. 2B, in interval 1 221, the change count is 'N' and the change bitmap is '0b000'. At this time, since the configuration switching flag is '0', the system configuration according to the SPx corresponding to the current value of the change count is applied. Therefore, a terminal newly entering the base station receives currently transmitted SPxs and applies the system configuration according to the received SPxs.

At interval 2 222, due to the update of SP2, the change count becomes 'N + 1', and the change bitmap becomes '0b010'. Here, the fact that the second bit of the change bitmap is changed to '1' in accordance with the update of the SP2 is a result according to a rule for notifying the update of the SPx. At this time, the rule is to toggle the bit corresponding to the updated SPx and to set the value of the bit corresponding to the updated SPx to '1'. Since the change count has increased, the UE recognizes that the system information has been updated, and determines that SP2 has been updated through the change bitmap. However, unlike the case of FIG. 2A, updated SP2 is not transmitted through the frame at the time when the change count is increased. However, since the configuration switching flag is '1', the currently applied system configuration is applied according to the system information when the change count is 'N'. Accordingly, the terminal reflects the SP2 received in the interval 1 221 in the system configuration regardless of whether the SP2 is received or not. After the change count and the change bitmap are changed and several superframes have elapsed, the SP2 is transmitted. Accordingly, the terminal obtains the updated system information by decoding the SP2, and stores the obtained system information. At this time, since the configuration change flag is maintained at '1', the terminal does not apply the stored SP2 and applies the SP2 received in the interval 1 (221).

In section 3 (223), the system information is not updated but the configuration switching flag is changed to '0'. Accordingly, the UE recognizes that the system configuration according to the system information updated in the interval 2 (222) is applied, and applies the SP2 received and stored in the interval 2 (222). In FIG. 2B, the configuration change flag is changed to '0' in the interval 3 (223), but the change bitmap still maintains '0b010'. However, according to another embodiment of the present invention, the change bitmap may be initialized to '0b000' at the same time that the configuration change flag is changed to '0'.
In the embodiment shown in FIG. 2B, the system configuration corresponding to the current value of the change count is applied when the configuration change flag is changed to '0'. However, according to another embodiment of the present invention, the system configuration corresponding to the current value of the change count may be configured such that after a certain number of superframes have elapsed since the configuration change flag was changed to '0'Lt; / RTI >

2C shows a case where updated SPxs are transmitted after an increase of the change counter. Referring to FIG. 2C, in interval 1 231, the change count is 'N' and the change bitmap is '0b000'. At this time, since the configuration switching flag is '0', the system configuration according to the SPx corresponding to the current value of the change count is applied. Therefore, a terminal newly entering the base station receives currently transmitted SPxs and applies the system configuration according to the received SPxs.

At interval 2 232, due to the change of SP1, SP2 and SP3, the change count becomes 'N + 1' and the change bitmap becomes '0b111'. Here, the fact that the first, second and third bits of the change bitmap are changed to '1' in accordance with the update of SP1, SP2 and SP3 is a result according to a rule for notifying the update of SPx. At this time, the rule is to toggle the bit corresponding to the updated SPx and to set the value of the bit corresponding to the updated SPx to '1'. Since the change count has increased, the UE recognizes that the system information has been updated, and determines that SP1, SP2, and SP3 have been updated through the change bitmap. At this time, only the SP1 is transmitted through the frame at the time when the change count is increased, and SP2 and SP3 are not transmitted. However, since the configuration switching flag is '1', the currently applied system configuration is applied according to the system information when the change count is 'N'. Accordingly, the terminal decodes and stores the SP1, and reflects the SPx received in the interval 1 231 in the system configuration regardless of whether the SP2 and the SP3 are received or not. After the change count and the change bitmap are changed and several superframes have elapsed, SP2 and SP3 are sequentially transmitted. Accordingly, the terminal obtains updated system information by decoding SP2 and SP3, and stores the obtained system information. At this time, since the configuration change flag is maintained at '1', the terminal does not apply the stored SPx, and applies the SPx received in the interval 1 (231).

In the interval 3 233, the system information is not updated, but the configuration switching flag is changed to '0'. Accordingly, the UE recognizes that the system configuration according to the updated system information is applied in the interval 2 (232), and applies the SPx received and stored in the interval 2 (232). In FIG. 2C, the configuration change flag is changed to '0' in the interval 3 (233), but the change bitmap still maintains '0b111'. However, according to another embodiment of the present invention, the change bitmap may be initialized to '0b000' at the same time that the configuration change flag is changed to '0'.
In the embodiment shown in FIG. 2C, the system configuration corresponding to the current value of the change count is applied when the configuration change flag is changed to '0'. However, according to another embodiment of the present invention, the system configuration corresponding to the current value of the change count may be configured such that after a certain number of superframes have elapsed since the configuration change flag was changed to '0'Lt; / RTI >

In the procedure described with reference to FIGS. 2A to 2C, the base station determines to apply the system configuration corresponding to the previous value of the change count for a predetermined period. Here, the criterion for determining whether to apply the system configuration corresponding to the previous value of the change count may vary according to the intention of the inventor of the present invention.

For example, whether to apply the system configuration corresponding to the previous value of the change count can be determined according to whether the terminals connected to the base station have all received the updated SPx. In this case, the BS uses the distribution of the listening interval of the sleep mode or idle mode UEs and the transmission time point of the updated SPx to determine the system configuration corresponding to the previous value of the change count It can be judged whether or not it is applied. Therefore, if all the terminals have a listening interval in at least one of the transmission time points of the updated SPx, the base station determines to apply the system configuration corresponding to the current value of the change count.

As another example, whether to apply the system configuration corresponding to the previous value of the change count, when at least one updated SPx is not transmitted in the superframe in which the change count and the change bitmap have changed, It can be judged whether or not transmission of the SPx is completed. In this case, after the transmission of the at least one updated SPx is completed, the base station determines to apply the system configuration corresponding to the current value of the change count. Specifically, the base station can apply the system configuration corresponding to the current value of the changed count from the next superframe after the updated SPx is once or twice transmitted. At this time, the BS may apply different transmission times according to the type of SPx. For example, when SP1 or SP2 is changed, the base station can apply the system configuration corresponding to the current value of the changed count after the updated SP1 or SP2 is transmitted twice, and when the SP3 is changed, The system configuration corresponding to the current value of the changed count after one SP3 has been transmitted can be applied. In this case, when a plurality of SPxs are changed, the base station preferably applies the system configuration corresponding to the current value of the changed counts at the latest application point of the application time point according to each SPx.

As another example, whether to apply the system configuration corresponding to the previous value of the change count may be determined according to whether or not a predetermined number of superframes have elapsed from the increase of the change count. In this case, if the predetermined number of superframes have not elapsed, the BS determines to apply the system configuration corresponding to the previous value of the change count.

As another example, a system configuration corresponding to the current value of the change count may be applied simultaneously with the increase of the change count. At this time, the base station determines to apply the system configuration corresponding to the current value of the change count from the superframe in which the change count is incremented, and sets the configuration change flag to '0' accordingly.
As described above, the time of applying the system configuration corresponding to the current value of the changed count can be determined according to various methods. Among the above-described embodiments, the terminal is also changed, for example, the method depending on whether the updated SPx is completed once or twice, the method depending on the elapse of a predetermined number of superframes, The time when the system configuration corresponding to the current value of the count is applied may be judged by oneself. In this case, the terminal can apply the system configuration corresponding to the current value of the change count at the time of self-determination without reference to the configuration change flag.
For example, a method according to whether or not the updated SPx is transmitted will be described as follows. SPx, that is, SP1, SP2, and SP3 are transmitted at intervals of predetermined superframes according to their respective periods, the terminal can calculate a superframe in which the SPx is received using the superframe number and the transmission period of each SPx . Accordingly, the terminal recognizes the changed SPx through the change bitmap, calculates the transmission time point of the SPx, and applies the system configuration corresponding to the current value of the change count from the next superframe of the superframe in which the SPx is transmitted . Specifically, when the changed bitmap is '0b010', the terminal determines that SP2 has been updated through the changed bitmap. Then, the terminal calculates the transmission time point of the next SP2 using the current super frame number and the transmission period of SP2, and updates the changed SP2 from the next superframe of the superframe in which the updated SP2 has been transmitted twice The system configuration corresponding to the current value of the count is applied.

Hereinafter, the operation and configuration of a base station and a terminal for transmitting and receiving system information will be described in detail with reference to the drawings.

FIG. 3 illustrates a system information transmission procedure of a base station in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 3, in step 301, the BS determines whether a start time of a superframe has arrived. In other words, the BS determines whether a time for transmitting a superframe header has arrived.

If the start time of the superframe has arrived, the base station proceeds to step 303 and checks whether system information needs to be updated. Here, the system information includes P-SFH and S-SFH, and the S-SFH is divided into a plurality of SPxs. For example, updating of the system information is performed by changing system settings such as a subchannelization method, a ranging method, a map version, and the like. That is, the BS determines whether the SPx transmitted through the superframe header needs to be updated due to a change in the system configuration.

If it is not necessary to update the system information, the BS proceeds to step 309. On the other hand, if it is necessary to update the system information, the BS proceeds to step 305 to update the corresponding SPx. That is, the base station updates the SPx including the parameters reflecting the changed system settings. At this time, one or a plurality of SPxs can be updated.

After updating the SPx, the BS proceeds to step 307 to change the change count and change bitmap. The change count and the change bitmap are parameters included in the P-SFH. The change count indicates whether or not the SPx is updated, and the change bitmap indicates the updated SPx. The change count increases with the update of SPx and increases only by the number of updates regardless of the number of updated SPx. The modified bitmap is a bit string having a length equal to the number of SPx used in the system, and at the time of updating SPx, the value of the position corresponding to the updated SPx is changed.

After changing the change count and the change bitmap, the BS determines in step 309 whether to apply the system configuration corresponding to the previous value of the change count. Here, the criterion for determining whether to apply the system configuration corresponding to the previous value of the change count may vary according to a specific embodiment. For example, the condition that the terminals connected to the base station have received all the updated SPx, the condition that the transmission of at least one updated SPx has been performed N times or more after the change count has increased, Determines whether to apply the system configuration corresponding to the previous value of the change count according to at least one of a condition that a predetermined number of super frames elapsed. That is, if at least one of the above conditions is satisfied, the base station determines to apply the system configuration corresponding to the current value of the change count.

If the system configuration corresponding to the previous value of the change count is to be applied, the BS proceeds to step 311 and transmits a parameter indicating a system configuration, for example, a configuration change flag or an S-SFH apply hold indicator 1 ". On the other hand, if the system configuration corresponding to the current value of the change count is to be applied, the BS proceeds to step 313 and sets the configuration change flag to '0'. The configuration change flag or the S-SFH apply hold indicator is included in the P-SFH as a parameter indicating what system configuration is applied. For convenience of explanation, the present invention refers to the parameter as a configuration switching flag.

Thereafter, the BS proceeds to step 315 and determines whether it is necessary to transmit SPx. For example, each SPx may be transmitted according to its own period. In this case, the base station checks the period of each SPx and determines whether or not a transmission period has arrived. As another example, if a particular SPx is updated, it may be transmitted concurrently with the update, or may be transmitted after a certain frame has elapsed since the update. If a plurality of SPxs are changed at the same time, the plurality of SPxs can not be transmitted through one subframe, and thus are transmitted over a plurality of superframes. In this case, the base station determines that it is necessary to sequentially transmit SPxs every superframe.

If transmission of the SPx is not required, the BS proceeds to step 317 and transmits the P-SFH through the super frame header. Here, the P-SFH includes the change count, the change bitmap, the configuration change flag, and the scheduling information bitmap. At this time, the scheduling information bitmap is set to a value indicating that SPx is not transmitted.

On the other hand, if it is necessary to transmit the SPx, the BS proceeds to step 319 to set the scheduling information bitmap. The scheduling information bitmap is a bit string having a length equal to the number of SPx used in the system, and a value of a position corresponding to SPx transmitted at the time of SPx transmission is set to '1'. That is, the BS generates the SPx using the scheduling information bitmap and the SPx designation information so that the terminal can decode the SPx.

After setting the scheduling information bitmap, the BS proceeds to step 321 and transmits SPx and P-SFH corresponding to the current value of the change count through the super frame header. Here, the P-SFH includes the change count, the change bitmap, the configuration change flag, and the scheduling information bitmap.

FIG. 4 illustrates a system information acquisition procedure of a terminal in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 4, in step 401, the terminal determines whether a start time of a superframe has arrived. In other words, the UE determines whether a time for receiving a superframe header has arrived.

If the start time of the superframe is reached, the terminal proceeds to step 403 and decodes the P-SFH. Since the P-SFH is coded according to a predetermined coding scheme and is received through a predetermined position of the superframe header, the UE can decode the P-SFH without any allocation information. By decoding the P-SFH, the terminal obtains system parameters, change counts, change bitmaps, scheduling information bitmaps, and parameters indicative of the applied system configuration. Here, the parameter indicating the applied system configuration may be referred to as a configuration switching flag or an S-SFH application hold indicator. For convenience of explanation, the present invention refers to the parameter as a configuration switching flag.

After decoding the P-SFH, the UE determines in step 405 whether the change count is increased. That is, the UE compares the change count included in the previously received P-SFH and the change count included in the currently received P-SFH, and confirms that the change count has increased. If the change count is not incremented, the terminal proceeds to step 409. In step 409,

On the other hand, if the change count is increased, the terminal proceeds to step 407 to check at least one SPx updated through the change bitmap. That is, the increase of the change count means the update of at least one SPx. Therefore, the terminal, which has recognized the update of at least one SPx through the incremental change count, confirms the updated SPx through the change bitmap included in the P-SFH. At this time, the display of the updated SPx through the changed bitmap is performed by setting the bit corresponding to the updated SPx to toggle or a value indicating update. In the case of the toggling method, the UE confirms the updated SPx by checking the position of the toggled bit relative to the change bitmap included in the previously received P-SFH. On the other hand, if the value is set, the terminal checks the bit position set to a corresponding value (e.g., '1') to determine what the updated SPx is.

After confirming the updated at least one SPx, the terminal proceeds to step 409 and checks whether the SPx that has not been stored is transmitted. Whether or not the SPx is transmitted is confirmed through the scheduling information bitmap. That is, the UE determines whether or not the SPx is transmitted based on whether or not there is a bit set to '1' in the scheduling information bitmap, and if the SPx is transmitted, It is determined whether SPx is transmitted. Then, the UE confirms whether the transmitted SPx is decoded and stored in the state of the current value of the change count. If the unsent SPx is not transmitted, the MS proceeds to step 413.

On the other hand, if unsent SPx is transmitted, the terminal proceeds to step 411 and decodes the SPx, and then stores the system information included in the SPx. At this time, since the application of the updated SPx may be delayed, the terminal does not discard the SPx before the update. That is, the terminal classifies and stores SPx according to the value of the change count. Accordingly, the terminal stores at least two pieces of system information, that is, system information corresponding to the current value of the change count and system information corresponding to the previous value of the change count, respectively.

In step 413, the MS determines whether the system configuration corresponding to the previous value of the change count is applied in the superframe. At this time, according to the embodiment of the present invention, whether or not the system configuration corresponding to the previous value of the change count is applied is confirmed through the configuration change flag. In contrast, according to another embodiment of the present invention, the UE can determine whether the system configuration corresponding to the previous value of the change count is applied according to a predefined condition without using the configuration change flag. For example, if the condition that the transmission of at least one updated SPx is performed N times or more after the change count is increased is satisfied, if the system configuration corresponding to the current value of the change count is applied, And calculates the next transmission time points of the updated at least one SPx. Then, the UE determines to apply the system configuration corresponding to the previous value of the change count up to the superframe in which the updated at least one SPx is transmitted N times. At this time, N may be 2 in case of SP1 or SP2, and 1 in case of SP3.

If the system configuration corresponding to the previous value of the change count is applied, the terminal proceeds to step 415 and performs communication by applying the system configuration corresponding to the previous value of the change count. In other words, the terminal performs communication according to the system configuration according to SPx received before the change count is increased to the current value.

On the other hand, if the system configuration corresponding to the previous value of the change count is not applied, that is, if the system configuration corresponding to the current value of the change count is applied, the terminal proceeds to step 417, Confirm that all corresponding SPx's are stored.

If all SPxs corresponding to the current value of the change count have been stored, the MS proceeds to step 419 and applies the system configuration corresponding to the current value of the change count to perform communication.

On the other hand, if the SPx corresponding to the current value of the change count is not stored, the terminal proceeds to step 421 and waits for reception of the SPx corresponding to the current value of the change count. In other words, the terminal stops communication until it stores all the SPx corresponding to the current value of the change count.

5 illustrates a block diagram of a base station in a broadband wireless communication system according to an embodiment of the present invention.

5, the BS includes a system information determiner 502, a P-SFH generator 504, an S-SFH generator 506, a subcarrier mapper 508, an OFDM modulator 510, And a transmitter 512. [

The system information determiner 502 determines system information to be provided to the UEs. That is, the system information determiner 502 determines the values of the parameters included in the P-SFH and the S-SFH. The system information determiner 502 updates the system information by reflecting the change of the system configuration and provides the update of the system information to the P-SFH generator 504 and the S-SFH generator 506.

In particular, the system information determiner 502 sets the change count and the change bitmap according to whether the SPx is updated, and sets the scheduling information bitmap according to whether SPx is transmitted. In addition, the system information determiner 502 sets the configuration change flag according to whether the system configuration corresponding to the previous value of the change count is applied or not. Here, the criterion for determining whether to apply the system configuration corresponding to the previous value of the change count may vary according to a specific embodiment. For example, the condition that the terminals connected to the base station have received all the updated SPx, the condition that the transmission of at least one updated SPx has been performed N times or more after the change count has increased, If at least one of the conditions that a predetermined number of superframes have elapsed is satisfied, the system information determiner 502 determines to apply the system configuration corresponding to the current value of the change count.

The P-SFH generator 504 generates a P-SFH including system information, a change count, a change bitmap, a scheduling information bitmap, and a configuration switching flag. Since the P-SFH is transmitted through the super frame header, the P-SFH generator 504 generates the P-SFH at the start time of the super frame. The S-SFH generator 506 generates SPxs containing system information. Since the SPxs are selectively transmitted according to each natural period or a defined rule, the S-SFH generator 506 generates the SPx when a transmission time comes.

The subcarrier mapper 508 maps a transmission signal to a resource. In particular, the sub-carrier mapper 508 maps the P-SFH provided from the P-SFH generator 504 and the SPx provided from the S-SFH 506 into a super frame header. The OFDM modulator 510 converts the signals mapped in the frequency domain into a time domain signal through IFFT (Inverse Fast Fourier Transform) operation, and inserts CP (Cyclic Prefix) to generate OFDM symbols. The RF transmitter 512 up-converts the OFDM symbols into an RF band signal, amplifies the signal, and transmits the amplified signal through an antenna.

FIG. 6 is a block diagram of a terminal in a broadband wireless communication system according to an embodiment of the present invention.

6, the UE includes an RF receiver 602, an OFDM demodulator 604, a sub-carrier demapper 606, a P-SFH interpreter 608, an S-SFH interpreter 610, a system information manager 612 and a controller 614. [

The RF receiver 602 amplifies the RF band signal received through the antenna and down-converts the RF band signal into a baseband signal. The OFDM demodulator 604 divides the signal from the RF receiver 602 into OFDM symbols and restores the signals mapped in the frequency domain through an FFT (Fast Fourier Transform) operation. The sub-carrier demapper 606 classifies the signals mapped in the frequency domain into processing units. For example, the processing unit may be a traffic burst, a message, or the like.

The P-SFH interpreter 608 obtains system information by demodulating and decoding the P-SFH received from the base station, and provides the obtained system information to the system information manager 612. The P-SFH interpreter 608 obtains parameters such as a change count, a change bitmap, a scheduling information bitmap, and a configuration switching flag from the P-SFH and provides the parameters to the system information manager 612 do. The S-SFH interpreter 610 obtains the system information by demodulating and decoding the SPx received from the base station, and provides the obtained system information to the system information manager 612.

The system information manager 612 stores system information provided from the P-SFH interpreter 608 and the S-SFH interpreter 610 and transmits the system information to the controller 614 to provide. In particular, the system information manager 612 provides system information stored to reflect the system configuration currently being applied in the current system, using the change count, the change bitmap, the scheduling information bitmap, and the configuration switch flag. The controller 614 controls a function for operating the terminal. In particular, the controller 614 controls communication according to the system information provided from the system information manager 612.

The operation of the system information manager 612 for managing the system information is as follows. The system information manager 612 confirms the update of the SPx through the increment of the change count, and identifies the updated SPx through the change bitmap. If the updated SPx is identified, the system information manager 612 checks whether the SPx that has not been stored is transmitted through the scheduling information bitmap, and transmits the SPx to the S-SFH interpreter 610). If the system information included in the updated SPx is provided from the S-SFH interpreter 610, the system information manager 612 stores the system information. At this time, since the application of the updated SPx may be delayed, the terminal does not discard the SPx before the update. That is, the system information manager 612 stores at least two pieces of system information, that is, the system information corresponding to the current value of the change count and the system information corresponding to the previous value of the change count, And provides the corresponding system information to the controller 614. Specifically, the system information manager 612 uses the configuration switching flag provided from the P-SFH interpreter 608 to determine whether the system configuration corresponding to the previous value of the change count is applied or corresponds to the current value of the change count And provides the controller 614 with system information according to the applied system configuration. However, according to another embodiment of the present invention, the system information manager 612 does not use the configuration switching flag and determines whether the system configuration corresponding to the previous value of the change count is applied according to a predefined condition . For example, if the condition that the transmission of at least one updated SPx is performed N times or more after the change count is increased is satisfied, if the system configuration corresponding to the current value of the change count is applied, the system information manager 612 ) Checks at least one SPx updated through the change bitmap, and then calculates the next transmission points of the updated at least one SPx. The system information manager 612 determines to apply the system configuration corresponding to the previous value of the change count to the superframe in which the updated at least one SPx is transmitted N times. At this time, N may be 2 in case of SP1 or SP2, and 1 in case of SP3.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 is a diagram illustrating an example of a frame structure in a broadband wireless communication system according to an embodiment of the present invention;

FIGS. 2A to 2C are diagrams showing transmission points of system information in a broadband wireless communication system according to an embodiment of the present invention; FIG.

3 is a diagram illustrating a system information transmission procedure of a base station in a broadband wireless communication system according to an embodiment of the present invention;

4 is a diagram illustrating a system information acquisition procedure of a terminal in a broadband wireless communication system according to an embodiment of the present invention;

5 is a block diagram of a base station in a broadband wireless communication system according to an embodiment of the present invention.

6 is a block diagram of a terminal in a broadband wireless communication system according to an embodiment of the present invention.

Claims (28)

A method of operating a base station in a broadband wireless communication system, Determining whether to apply a system configuration corresponding to a previous value of a change count which is changed in accordance with an update of the system information; Setting a parameter indicating a system configuration to be applied to a first value when a system configuration corresponding to a previous value of the change count is applied; Setting the parameter to a second value when applying a system configuration corresponding to a current value of the change count; (P-SFH) including the change count and the parameter set to the first value or the second value, Wherein the parameter indicates that the system configuration corresponding to one of a previous value or a current value of the change count is applied, Wherein the parameter is smaller in magnitude than the change count. The method according to claim 1, Increasing the change count when at least one of subpackets (SPs) of a Secondary-Super Frame Header (S-SFH) is updated; Changing at least one bit corresponding to the updated at least one SP in a change bitmap for identifying at least one updated SP; Further comprising the step of transmitting the change count and the P-SFH including the change bitmap. 3. The method of claim 2, Further comprising the step of transmitting the updated at least one SP through a superframe header that has transmitted the P-SFH including the change count and the change bitmap. 3. The method of claim 2, Further comprising the step of transmitting the updated at least one SP after at least one superframe has elapsed after transmitting the change count and the P-SFH including the change bitmap. The method according to claim 1, Incrementing the change count when a plurality of SPs of the S-SFHs are updated; Changing a plurality of bits corresponding to the plurality of SPs in a change bitmap for identifying the updated at least one SP, Transmitting the P-SFH including the change count and the change bitmap; Further comprising transmitting the plurality of SPs, one per superframe, over a plurality of superframes. 6. The method of claim 5, Setting the parameter to the second value after transmission of the plurality of SPs is completed; And transmitting the P-SFH including the parameter set to the second value. The method according to claim 1, Wherein the step of determining whether to apply the system configuration corresponding to the previous value of the change count comprises: A condition that the terminals connected to the base station have received all of the updated SPx, a condition that at least one updated SPx is transmitted N times after the change count is increased, and a condition that the number of transmissions of the updated SPx is N times, If a condition that at least one of the conditions of the change count is satisfied is satisfied, determining that the system configuration corresponding to the current value of the change count is to be applied. A method of operating a terminal in a broadband wireless communication system, Confirming a value of a parameter indicating an applied system configuration included in a primary super-frame header (P-SFH) received through a super frame header and a value of a change count changed according to an update of the system information; Performing communication by applying a system configuration corresponding to a previous value of the change count when the value of the parameter is a first value; And performing communication by applying a system configuration corresponding to a current value of the change count when the value of the parameter is a second value, Wherein the parameter indicates that the system configuration corresponding to one of a previous value or a current value of the change count is applied, Wherein the size of the parameter is less than the size of the change count. 9. The method of claim 8, Decoding the SP when one of SPs (Sub-Packets) of a Secondary-Super Frame Header (S-SFH) is received; Further comprising the step of classifying and storing the SP according to the value of the change count. 10. The method of claim 9, Identifying at least one updated SP among the SPs of the S-SFH using a change bitmap included in the P-SFH when the value of the change count included in the P-SFH increases; , Further comprising the step of checking whether the updated at least one SP is transmitted through the scheduling information bitmap included in the P-SFH. 9. The method of claim 8, Determining whether all SPs corresponding to the current value of the change count are stored if the value of the parameter is a second value; And stopping the communication until all the SPs corresponding to the current value are stored if the SPs corresponding to the current value are not stored. A method of operating a terminal in a broadband wireless communication system, Checking a change count to be changed according to an update of system information included in a primary super frame header (P-SFH) received through a super frame header; Identifying at least one updated SP among the SPs of the S-SFH using a change bitmap included in the P-SFH when the value of the change count is increased; Determining a transmission time point of the updated at least one SP; Determining a superframe to which a system configuration corresponding to a current value of the change count is applied using the transmission time point of the SP, And when the superframe arrives, performing communication by applying a system configuration corresponding to a current value of the change count. 13. The method of claim 12, Decoding the SP when one of SPs (Sub-Packets) of a Secondary-Super Frame Header (S-SFH) is received; Further comprising the step of classifying and storing the SP according to the value of the change count. 13. The method of claim 12, Wherein the determining of the superframe to which the system configuration corresponding to the current value of the change count is applied comprises: If the updated at least one SP is SP1 or SP2, the next superframe of a superframe in which the SP1 or SP2 is transmitted twice after the change count is increased is compared with a system configuration corresponding to the current value of the change count To a superframe to which the superframe is applied; When the updated at least one SP is SP3, the next superframe of the superframe in which the SP3 is once transmitted after the change count is increased is set to a superframe to which the system configuration corresponding to the current value of the change count is applied ≪ / RTI > A base station apparatus in a broadband wireless communication system, A system configuration applied when a system configuration corresponding to a previous value of the change count is applied after determining whether or not to apply a system configuration corresponding to a previous value of a change count to be changed in accordance with the update of the system information A determiner for setting the parameter indicating the change count to a first value and setting the parameter to a second value when applying the system configuration corresponding to the current value of the change count; And a transmitter for transmitting the change count and a Primary-Super Frame Header (P-SFH) including the parameter set to the first value or the second value, Wherein the parameter indicates that the system configuration corresponding to one of a previous value or a current value of the change count is applied, Wherein the size of the parameter is smaller than the size of the change count. 16. The method of claim 15, The determining unit increases the change count when at least one of subpackets (SPs) of a secondary-super-frame header (S-SFH) is updated, changes a change bitmap for identifying at least one updated SP, Changes at least one bit corresponding to the updated at least one SP, Wherein the transmitter transmits a P-SFH comprising the change count and the change bitmap. 17. The method of claim 16, Wherein the transmitter transmits the updated at least one SP through the superframe header that transmitted the P-SFH including the change count and the change bitmap. 17. The method of claim 16, Wherein the transmitter transmits the P-SFH including the change count and the change bitmap and sends the updated at least one SP after at least one superframe elapses. 16. The method of claim 15, Wherein the determiner is configured to increment the change count when a plurality of SPs of the SPs of the S-SFH are updated and to generate a plurality of bits corresponding to the plurality of SPs in a change bitmap for identifying the updated at least one SP Lt; / RTI > Wherein the transmitter transmits the plurality of SPs, one per superframe, over a plurality of superframes after transmitting the P-SFH including the change count and the change bitmap. 20. The method of claim 19, Wherein the determiner sets the parameter to the second value after transmission of the plurality of SPs is completed, Wherein the transmitter transmits a P-SFH including the parameter set to the second value. 16. The method of claim 15, Wherein the determiner comprises: a condition that the terminals connected to the base station have received all the updated SPx; a condition that at least one updated SPx is transmitted N times after the change count is incremented; And determines that the system configuration corresponding to the current value of the change count is to be applied if at least one of the conditions that the number of superframes has elapsed is satisfied. In a terminal apparatus in a broadband wireless communication system, A manager for checking a value of a parameter indicating an applied system configuration included in a primary super frame header (P-SFH) received through a super frame header and a value of a change count changed according to the update of the system information; The system configuration corresponding to the previous value of the change count is applied when the value of the parameter is the first value and the system configuration corresponding to the current value of the change count is applied when the parameter value is the second value And a controller for performing communication by performing a communication, Wherein the parameter indicates that the system configuration corresponding to one of a previous value or a current value of the change count is applied, Wherein the size of the parameter is smaller than the size of the change count. 23. The method of claim 22, Further comprising an S-SFH interpreter which decodes the SP when one of subpackets of a Secondary-Super Frame Header (S-SFH) is received, Wherein the manager classifies and stores the SP according to the value of the change count. 24. The method of claim 23, Wherein the manager identifies at least one updated SP among the SPs of the S-SFH using a change bitmap included in the P-SFH when the value of the change count included in the P-SFH increases And checks whether the updated at least one SP is transmitted through the scheduling information bitmap included in the P-SFH. 23. The method of claim 22, Wherein the manager verifies whether all the SPs corresponding to the current value of the change count are stored when the value of the parameter is the second value, Wherein the controller stops communication until all the SPs corresponding to the current value are stored if the SPs corresponding to the current value are not stored. In a terminal apparatus in a broadband wireless communication system, SFH (Primary-Super Frame Header) received via the superframe header, and when the value of the change count is increased, a change included in the P-SFH Identifying at least one updated SP of the SPs of the S-SFH using a bitmap, determining a transmission time point of the updated at least one SP, A manager for determining a superframe to which a system configuration corresponding to a current value of the count is applied, And a controller for performing communication by applying a system configuration corresponding to a current value of the change count when the superframe arrives. 27. The method of claim 26, Further comprising an S-SFH interpreter which decodes the SP when one of subpackets of a Secondary-Super Frame Header (S-SFH) is received, Wherein the manager classifies and stores the SP according to the value of the change count. 27. The method of claim 26, When the updated at least one SP is SP1 or SP2, the manager superimposes the next superframe of a superframe in which the SP or the SP2 is transmitted twice after the change count is incremented to correspond to the current value of the change count If the updated at least one SP is SP3, the superframe of the superframe in which the SP3 is once transmitted after the change count is increased is determined as the superframe to which the system configuration of the change count is applied Value as a superframe to which the system configuration corresponding to the value is applied.

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