KR20100100675A - Method and apparatus of updating for system information in a broadband wireless communication system - Google Patents

Abstract

PURPOSE: A system information update method and an apparatus thereof for efficiently updating system information in a broadband wireless communications system are provided to supply unnecessary system information decoding operation and power consumption of a terminal. CONSTITUTION: A receiver(20) receives system information and system change information from a base station through a super-frame header. The system change information indicates the change of the system information. A controller(40) updates the system information with reference to the system change information. The super-frame header includes the first and second super-frame headers. The first super-frame header includes the system change information.

Description

METHOD AND APPARATUS OF UPDATING FOR SYSTEM INFORMATION IN A BROADBAND WIRELESS COMMUNICATION SYSTEM}

The present invention relates to system information update in a broadband wireless communication system, and relates to a method and apparatus for updating system information delivered through a super frame header.

In the broadband wireless communication system, system information necessary for communication must be transmitted from a base station to a terminal for communication between the base station and the terminal. The base station may transmit system information necessary for communication with the terminal through a super frame header (hereinafter referred to as 'SFH'), and additionally necessary system information may be transmitted through a separate broadcast message.

Essential system information transmitted through the SFH of the system information should be periodically updated for continuous communication between the base station and the terminal, the terminal periodically checks whether the necessary system information transmitted from the base station is updated and decoded And update.

However, even when the system information is not changed, when the terminal decodes and updates system information delivered through SFH every time, it causes unnecessary power consumption of the terminal. In particular, when the terminal is in a sleep mode or idle mode, decoding and updating the system information transmitted through the SFH is a power consumption aspect of the terminal even when the system information is not changed. This results in inefficient operation.

Therefore, a more efficient system information update operation method is required to prevent power consumption of the terminal.

The present invention is to solve the above problems, and provides an operation method and apparatus for preventing unnecessary system information decoding operation and power consumption of the terminal and more efficient system information update.

System information update method according to an embodiment of the present invention for achieving the above object, in the system information update method of the receiver for receiving data through a superframe, the system information and the system information from a base station Receiving system change information indicating whether or not to change through a superframe header, and updating the system information with reference to the system change information, wherein the superframe header includes the system change information; And a second superframe header including a first superframe header and at least one subpacket including the system information, wherein the scheduling periodicity information indicating a transmission period of the subpacket is the first superframe. Via a frame header or one specified subpacket When the receiver does not receive a subpacket through which the changed system information is transmitted in a superframe corresponding to the scheduling period information, the receiver does not enter a sleep or idle mode until the corresponding subpacket is received. .

Preferably, the second superframe header is composed of three subpackets having different transmission periods, and the system change information includes three bits indicating a change state of each system information included in the three subpackets. It includes bitmap information consisting of, and when the system information included in a particular subpacket is changed, the bit of the corresponding position of the bitmap is toggled or set to bit value 1.

Preferably, the system change information includes a change counter which has a value of any one of 16 numbers and increases by 1 whenever any value of the subpacket including system information is changed. The system change information may further include bitmap information including at least one bit indicating a change state of each system information included in the at least one subpacket, wherein the updating of the system information includes: When the difference between the two values is generated by comparing the stored change counter with the received change counter, the changed system information is decoded and updated with reference to the bitmap information.

Preferably, the transmission offset information indicating that the subpackets are transmitted through a superframe spaced apart by a superframe interval from the superframe through which the scheduling period information is transmitted is further received.

The system information update method according to another embodiment of the present invention for achieving the above object, in the system information update method of the receiver for receiving data through a superframe, the system information from the base station and the system Receiving system change information indicating whether information has been changed through a superframe header, and updating the system information with reference to the system change information, wherein the superframe header includes the system change information. A second superframe header including a first superframe header and at least one subpacket including the system information, and scheduling periodicity information indicating a transmission period of the subpacket is a specified one. Received via a subpacket of If the subpacket through which the changed system information is transmitted in the superframe corresponding to the scheduling period information is not received, the specific subpacket is operated by operating in the normal mode until the specific subpacket through which the scheduling period information is transmitted is received. And a transmission time point of a subpacket which receives the changed system information by referring to the scheduling period information included in the specific subpacket.

Preferably, the second superframe header is composed of three subpackets having different transmission periods, and the system change information is composed of three bits indicating a change state of each system information included in the three subpackets. It includes the configured bitmap (bitmap) information, characterized in that the bit of the corresponding position of the bitmap is toggled or set to a bit value 1 when the system information included in a particular subpacket is changed.

Preferably, the system change information includes a change counter which has a value of any one of 16 numbers and increases by 1 whenever any value of the subpacket including system information is changed.

Preferably, the system change information further includes bitmap information composed of at least one or more bits indicating a change state of each system information included in the at least one subpacket, wherein the updating of the system information comprises: When the difference between the two values is generated by comparing the previously stored change counter with the received change counter, the changed system information is decoded and updated with reference to the bitmap information.

Preferably, the transmission offset information indicating that the subpackets are transmitted through a superframe spaced apart by a superframe interval from the superframe through which the scheduling period information is transmitted is further received.

System information updating apparatus according to an embodiment of the present invention for achieving the above object comprises a receiver for receiving system change information indicating whether to change the system information and the system information from the base station through a superframe header; And a controller for updating the system information with reference to the system change information, wherein the superframe header includes a first superframe header including the system change information and at least one subpacket including the system information. A second superframe header configured, wherein scheduling periodicity information indicating a transmission period of the subpacket is received through one specified subpacket, and the controller corresponds to a super corresponding to the scheduling period information. If the system does not receive the subpacket transmitted with the changed system information in the frame, it is characterized by controlling to operate in the normal mode (wake up) until the corresponding subpacket is received.

Preferably, in the apparatus, the second superframe header is composed of three subpackets having different transmission periods, and the system change information indicates a change state of each system information included in the three subpackets. It includes bitmap information consisting of three bits, and when the system information included in a specific subpacket is changed, the bit at the corresponding position of the bitmap is toggled or set to bit value 1. It is done.

Preferably, in the apparatus, the system change information has a value of any one of 16 numbers and includes a change counter that increases by 1 whenever any value of the subpacket including system information is changed. It is done.

Advantageously, in said apparatus, said system change information further comprises bitmap information composed of at least one or more bits representing a change state of each system information included in said at least one subpacket, said controller. When the difference between the two values is generated by comparing the previously stored change counter with the received change counter, the changed system information is decoded and updated with reference to the bitmap information.

Preferably, the apparatus further includes transmission offset information indicating that the subpacket is transmitted through a superframe spaced apart by a superframe interval from the superframe in which the scheduling period information is transmitted. It is characterized by.

According to the present invention, even when the system information is not changed, the terminal does not decode and update the system information transmitted through the SFH, thereby preventing the terminal from wasting power.

In addition, even when the transmission period of each subpacket through which the system information is transmitted is changed, the UE may not perform scanning in every superframe until the terminal knows when the corresponding subpacket is transmitted. The effect of performing an effective operation in the idle mode occurs.

1 is a diagram schematically showing a higher level frame structure.
2 is a diagram schematically showing a frame structure of the FDD scheme.
3 is a diagram schematically illustrating a frame structure of a TDD scheme.
4 is a flowchart sequentially illustrating a process of detecting an information error in a P-SFH received from a base station by a terminal according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an embodiment of a method of changing CC (change count) and S-SFH subpacket (SP) CB (change bitmap) information of an S-SFH delivered through a P-SFH when system information is changed. .
6 is a diagram sequentially illustrating a system information update process according to the first embodiment of the present invention.
7 is a diagram sequentially illustrating a system information update process according to a second embodiment of the present invention.
8 is a diagram sequentially illustrating a system information update process according to a third embodiment of the present invention.
9 is a diagram illustrating an S-SFH update process of a sleep mode / idle mode terminal according to one embodiment of the present invention.
10 is a diagram illustrating transmission offset values when transmission offset information is transmitted through a P-SFH when the transmission period setting index is 0.
11 is a diagram illustrating transmission offset values when transmission offset information is transmitted through a P-SFH when the transmission period setting index is 1;
12 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP1 when the transmission period setting index is 0.
13 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP1 when the transmission period setting index is 1;
14 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP2 when the transmission period setting index is 0.
15 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP2 when the transmission period setting index is 1;
16 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP3 when the transmission period setting index is 0.
FIG. 17 is a diagram illustrating one embodiment of an integrated set of transmit offsets delivered via S-SFH SP3.
18 is a diagram illustrating simplified transmission offset information.
FIG. 19 is a diagram illustrating an embodiment of informing transmission period and transmission offset information of S-SFH SPs.
20 is a diagram illustrating an embodiment of S-SFH update when a corresponding S-SFH SP is not received in a superframe scheduled to transmit a changed S-SFH SP.
FIG. 21 is a diagram illustrating another embodiment of S-SFH update when a corresponding S-SFH SP is not received in a superframe scheduled to transmit a changed S-SFH SP.
FIG. 22 is a diagram illustrating another embodiment of S-SFH update when a corresponding S-SFH SP is not received in a superframe scheduled to transmit a changed S-SFH SP.
FIG. 23 is a diagram illustrating an embodiment of S-SFH SP update when a scheduling transmission period is changed.
FIG. 24 is a diagram illustrating another embodiment of S-SFH SP update when a scheduling transmission period is changed.
25 is a block diagram schematically illustrating a configuration of an apparatus for updating system information according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or similar components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. In addition, in describing the present invention, when it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easily understanding the spirit of the present invention and should not be construed as limiting the spirit of the present invention by the accompanying drawings.

The communication system of the present invention includes a base station and a terminal as a system for providing various communication services such as voice and packet data.

The terminal of the present invention may be referred to as a subscriber station (SS), a user equipment (UE), a mobile equipment (ME), a mobile station (MS), and the like, and has a communication function such as a mobile phone, a PDA, a smart phone, a laptop, and the like. Includes a portable device equipped with a portable device or a PC, such as a vehicle-mounted device.

The base station of the present invention refers to a fixed point for communicating with the terminal, and may be used in terms of a base station (BS), an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. One or more cells may exist in one base station, and an interface for transmitting user traffic or control traffic may be used between base stations. In addition, downlink means a communication channel from the base station to the terminal, and uplink means a communication channel from the terminal to the base station.

The multiple access scheme applied to the wireless communication system of the present invention includes Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Single Carrier-FDMA (SC-FDMA), and Orthogonal (OFDMA). Frequency division multiple access) or other known modulation techniques.

In addition, the multiple access schemes for downlink and uplink transmission may be different from each other. For example, downlink may use OFDMA technique and uplink may use SC-FDMA technique.

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, wherein like reference numerals refer to the like elements throughout. The description will be omitted.

1 is a diagram schematically showing a higher level frame structure.

As shown, the frame structure applied to the system of the present invention may be a basic component of a frame of 5ms, the frame may be defined as the interval between preambles as one basic transmission unit. The frame may include at least one subframe, and may include a plurality of transmission time intervals (TTIs) having different sizes. The TTI is a basic unit of scheduling performed in a medium access control (MAC) layer, and the TTI may be referred to as a radio resource allocation unit.

In addition, a super frame including a plurality of frames is configured, and the super frame may be configured, for example, in units of 20 ms. When the super frame is configured, system configuration information and broadcast information for initial fast cell selection and low latency service are set as a transmission unit, and generally two to six frames are set as one transmission unit. It consists of super frames. In addition, each 5ms frame consists of a plurality of sub-frames, and each subframe consists of a plurality of OFDM / OFDMA symbols. Each super frame includes one super frame header (SFH) including a broadcast channel, and the SFH is located in the first subframe of the super frame.

The frame structure may be designed according to a bandwidth of a system channel, a duplex scheme, a cyclic prefix length, and the like.

2 is a diagram schematically illustrating a frame structure of a frequency division duplex (FDD) scheme.

In the FDD mode, downlink and uplink transmissions are distinguished in the frequency domain, and all subframes in each frame are capable of both downlink and uplink transmissions. A UE in FDD mode may receive a data burst in any downlink subframe while simultaneously accessing an uplink subframe.

As shown in FIG. 2, a 20 ms super frame includes four 5 ms frames F0, F1, F2, and F3, and one frame F2 includes eight subframes SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7) and Idle time interval of 62.86μs. In addition, each subframe may be composed of seven OFDM symbols SO, S1, S2, S3, S4, S5, and S6.

3 is a diagram schematically illustrating a frame structure of a time division duplex (TDD) scheme.

In the TDD mode, downlink and uplink transmissions are distinguished in the time domain, and after downlink transmission time intervals, uplink transmission time intervals are allocated to transmit and receive data through downlink and uplink.

As shown in FIG. 3, a 20 ms super frame includes four 5 ms frames F0, F1, F2, and F3, and one frame F2 includes eight subframes SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7) and Idle time interval of 62.86μs. The frame F2 is composed of consecutive D downlink frames and consecutive U uplink frames determined according to a ratio (D: U) of DL and UL, and a ratio of DL and UL is 5: 3. In this case, five subframes SF0, SF1, SF2, SF3, SF4 are configured as downlink frames, and three subframes SF5, SF6, SF7 are configured as uplink frames. One idle symbol for distinguishing the DL and the UL is inserted between the last downlink subframe SF4 and the first uplink subframe SF5 to inform that the switch is switched from the DL to the UL. As such, the gap inserted between the downlink and the uplink is called a TTG (transmit transition gap), and the gap inserted between the uplink and the downlink is called a receive transition gap (RTG). And uplink transmission can be distinguished.

In addition, the last downlink subframe SF4 is composed of five OFDM symbols and the last one Idle symbol (S5), the Idle symbol (S5) serves as a transmit / receive transition gap (TGT) for distinguishing the DL and UL. Will be

Hereinafter, the SFH will be described in detail.

In a broadband wireless access system, SFH (Super Frame Header) delivers the system information necessary for communication with the base station to the terminals. SFH is located in the first subframe in one superframe, as described with reference to FIG. Also, the SFH may include a primary SFH (P-SFH) through which control information for receiving system information is transmitted, and an S-SFH (secondary SFH) through which essential system information such as a network entry is transmitted.

S-SFH may be composed of a plurality of subpackets (hereinafter referred to as 'SP') according to the transmission frequency of the system information to be delivered, preferably comprising three SPs (SP1, SP2, SP3) Can be.

The P-SFH is transmitted every superframe, and the information element (IE) of the P-SFH includes 4bit-LSB information of the superframe number and information related to the S-SFH. The P-SFH IE may mean a set of information related to system information delivered through the superframe number and the S-SFH.

Information related to the S-SFH includes the S-SFH change count indicating the S-SFH version currently transmitted, the S-SFH Scheduling information bitmap indicating whether the S-SFH SP (s) are transmitted in the corresponding superframe, and the like. S-SFH size indicating the number of LRUs allocated for SFH transmission, S-SFH number of repetitions indicating the transmission format of S-SFH, S-SFH SP change bitmap indicating which S-SFH SP has been changed, and the like. . The size of the S-SFH Scheduling information bitmap and the S-SFH SP change bitmap field is equal to the total number of SPs of the S-SFH.

S-SFH conveys actual system information, and the system information delivered is divided into three subpackets according to its characteristics, as described above, and each of them is S-SFH SPn (n = 1, 2, 3). It is called). Each S-SFH SP information element (IE) may mean a set of system information delivered through each sub packet (SP), each SP information element (IE) has a different transmission period, the transmission period of the SP1 When T _SP1 , SP2 is called T _SP2 , and _{SP3 is} called T _SP3 , each subpacket may be represented by T _SP1 <T _SP2 <T _SP3 . have.

For continuous communication with the base station, the terminal must update the system information delivered through the S-SFH, but decoding and updating the S-SFH is inefficient in terms of power consumption of the terminal even though the system information has not changed. Therefore, the present invention proposes an efficient update method of system information delivered through S-SFH.

The terminal must detect an information error in the P-SFH received from the base station before updating the system information delivered from the base station.

4 is a flowchart sequentially illustrating a process of detecting an information error in a P-SFH received from a base station by a terminal according to an embodiment of the present invention.

P-SFH includes 4bit-LSB superframe number (SFN), S-SFH change count (hereinafter referred to as 'CC'), S-SFH Scheduling information bitmap, S-SFH size, S-SFH number of repetitions, S-SFH SP A cyclic redundancy check (CRC) for error detection may be included along with a change bitmap (hereinafter referred to as 'CB').

In general, the terminal calculates a CRC value based on the received data to check whether there is an error in the information in the P-SFH transmitted through the air interface. The terminal determines whether an error occurs in the information in the P-SFH according to the calculated CRC value.

The present invention proposes a process of additionally determining whether an error has occurred using the 4bit-LSB SFN field in the P-SFH even when it is determined that no error occurs in a general P-SFH error detection procedure through the CRC.

First, the terminal decodes the received P-SFH (S401).

The CRC value included in the P-SFH is first decoded to determine whether an error occurs in the information in the P-SFH (S403).

If it is determined that an error has occurred through the CRC check, if an error occurs in the corresponding superframe, it is treated as an error (S417). If it is determined that an error has not occurred, essential system information is obtained through an initial network entry process. UE successfully receives (DL synchronization) calculates the SFN itself.

Accordingly, by comparing the SFN in the P-SFH transmitted by the base station with the SFN calculated by the base station, it is determined whether the corresponding P-SFH is properly transmitted without error (S405).

The terminal having determined that an error has occurred in the information in the P-SFH may treat the error as occurring in the corresponding superframe and may not perform any operation (S417).

If it is determined that the SFN in the P-SFH transmitted by the base station is the same as the SFN comparison result calculated by the base station, the corresponding superframe is determined to be free of errors (S407).

If the S-SFH is transmitted in the corresponding superframe, the UE can calculate the CRC for the S-SFH and if it is determined that there is no error in the information in the S-SFH, the UE can take normal operation in the superframe.

Hereinafter, an essential system information update procedure of the terminal using the S-SFH change count and the S-SFH SP change bitmap transmitted through the P-SFH will be described.

FIG. 5 is a diagram illustrating an embodiment of a method of changing CC (change count) and S-SFH subpacket (SP) CB (change bitmap) information of an S-SFH delivered through a P-SFH when system information is changed. .

The S-SFH change count (CC) transmitted through the P-SFH may be changed by the base station in units of S-SFH subpackets (SP).

In FIG. 5, CC is a change count indicating whether essential system information transmitted through S-SFH is changed, and SI is a scheduling information bitmap of S-SFH, which is scheduled in a corresponding superframe and delivered to UE. S-SFH SP is shown. In addition, CB is a change bitmap of S-SFH and consists of the number of bits as many as the number of SPs. When a specific SP is changed, system information is displayed in the corresponding superframe by toggling the bit of the corresponding position or setting the bit value to 1. It may indicate a changed SP.

As shown, in the superframe, CC, SI and CB information of the S-SFH can be transmitted through the P-SFH, the CC value stored in the terminal at this time is 25 and the system information has not changed in the superframe 1 Assuming that the S-SFH SP1 and SP2 are scheduled and delivered, the CC value transmitted through the P-SFH of the superframe 1 is equal to the CC value stored in the terminal at 25, and is scheduled from the base station and transmitted to the superframe 1 The SI bitmap is set to '110' to indicate that the SPs of the S-SFH are SP1 and SP2, and the CB is set to '000' to indicate that the SP IEs are not changed and transmitted.

In FIG. 5, the system information belonging to the S-SFH SP IE (s) is changed so that the S-SFH change count is increased in the superframe in which the changed S-SFH SP IE is first transmitted. That is, in superframe 2, which is a time point when the changed SP1 and SP2 are initially transmitted, the CC increases a count from 25 to 27. At this time, since the count is increased in units of SPs, since two SPs are changed, the CC is increased by two counts to 27.

Therefore, in the P-SFH of Superframe 2, the current CC is counted up to 27, and the SI bitmap is set to '110' to indicate that the SPs of the scheduled S-SFH are SP1 and SP2, and CB is changed to SP IEs. It is set to '110' to indicate that it is SP1 and SP2.

In addition, since the system information is not changed in Superframe 3 and only SP1 is scheduled, the CC remains at 27 in the P-SFH of Superframe 3, and the SI bitmap indicates that the SP of the scheduled S-SFH is SP1. Is set to '100' and CB remains '110'.

According to another embodiment of the present invention, the increase in the CC count may be implemented to increase in units of superframes. In addition, regardless of the transmission time of the S-SFH SP IE, it is also possible to implement to increase the S-SFH CC in the superframe that the base station recognizes the need to change.

Hereinafter, a method of updating system information of a terminal receiving system change information will be described.

6 is a diagram sequentially illustrating a system information update process according to the first embodiment of the present invention.

The base station includes a P-SFH IE including an S-SFH scheduling information bitmap (SI), an S-SFH change counter (CC), and an S-SFH subpacket (SP) change bitmap (S-SFH SP CB). Send to the terminal.

The terminal receiving the P-SFH IE from the base station decodes the received P-SFH IE (S601).

The UE determines whether to decode the S-SFH IE by decoding the S-SFH change counter (CC) and the S-SFH SP change bitmap (CB) information included in the P-SFH IE.

First, the terminal compares the previously received and stored S-SFH CC value with the newly received S-SFH CC value (S603).

As a result of comparing the CC values, when there is no difference between the two values (CC difference = 0), it is determined that there is no change of the S-SFH, and the decoding of all the S-SFH IEs is omitted (S605).

As a result of comparing the CC values, when the difference between the two values is greater than 1 (CC difference> 1), the UE determines that at least one S-SFH IE change has occurred and performs decoding on all S-SFH IEs ( S607). After performing decoding on all S-SFH IEs, the UE stores the changed S-SFH CC value and S-SFH SP CB value (S617).

As a result of the comparison of the CC value, when the difference between the two values is 1 (CC difference = 1), the UE compares the previously received and stored S-SFH CB and the newly received S-SFH CB (S609).

As a result of comparing the changed bitmap, the S-SFH SP IE corresponding to the toggled bit position is determined to be the changed S-SFH SP IE, and the corresponding SP IE is decoded and updated (S611).

Thereafter, the terminal stores the changed S-SFH CC value and S-SFH SP CB value (S617).

In the embodiment of FIG. 6, when the difference between the stored S-SFH change count and the S-SFH change count of the currently received P-SFH is 2, the same S-SFH SP is continuously changed (S-SFH SP change bitmap. When the value of the position is toggled: 0 → 1 → 0), the UE may know whether the S-SFH is changed but not which S-SFH SP has been changed. When the UE does not know which S-SFH SP has been changed, it is determined by checking whether the S-SFH change count difference value is 1 or more than 2 to receive all S-SFH SPs.

7 is a diagram sequentially illustrating a system information update process according to a second embodiment of the present invention.

In the embodiment of FIG. 7, when determining using the S-SFH change count and the S-SFH SP change bitmap (toggle the difference value), the S-SFH SP bit information continuously changed may be grasped.

As in FIG. 6, the base station includes an S-SFH scheduling information bitmap (SI), an S-SFH change counter (CC), and an S-SFH subpacket (SP) change bitmap (S-SFH SP CB). The terminal transmits the P-SFH IE to the terminal, and the terminal receiving the P-SFH IE from the base station decodes the received P-SFH IE (S601).

The UE determines whether to decode the S-SFH IE by decoding the S-SFH change counter (CC) and S-SFH SP change bitmap (CB) information included in the P-SFH IE, and previously received and stored The S-SFH CC value is compared with the newly received S-SFH CC value (S703).

As a result of comparing the CC values, when there is no difference between the two values (CC difference = 0), it is determined that there is no change of the S-SFH as in the embodiment of FIG. 6 and the decoding of all the S-SFH IEs is omitted. (S605).

As a result of the comparison of the CC value, when the difference between the two values (CC difference ≠ 0), the terminal compares the previously received and stored S-SFH CB and the newly received S-SFH CB bit information by the difference of the CC value It is determined whether it is toggled (S707).

When the change bits are toggled by the difference of the CC value, the S-SFH SP IE corresponding to the toggled bit position is determined as the changed S-SFH SP IE, and the corresponding SP IE is decoded and updated (S711). For example, if the difference value of the S-SFH change count is 2, the stored CB is '000' and the received CB is '011', the values of two bits among the bits of the S-SFH SP change bitmap are toggled. In this case, it is determined that bits are toggled by the difference value of the CB value.

Thereafter, the terminal stores the changed S-SFH CC value and S-SFH SP CB value (S719).

If the change bits are not toggled by the difference of the CC value, the UE decodes and updates all S-SFH SPs.

8 is a diagram sequentially illustrating a system information update process according to a third embodiment of the present invention.

The base station includes a P-SFH IE including an S-SFH scheduling information bitmap (SI), an S-SFH change counter (CC), and an S-SFH subpacket (SP) change bitmap (S-SFH SP CB). Send to the terminal. In this case, the base station sets only the value of the bit (s) corresponding to the changed S-SFH SP (s) to 1, and sets the other bit (s) to 0 unlike the above.

The terminal receiving the P-SFH IE from the base station decodes the received P-SFH IE (S601).

The UE determines whether to decode the S-SFH IE by decoding the S-SFH change counter (CC) and the S-SFH SP change bitmap (CB) information included in the P-SFH IE.

First, the terminal compares the previously received and stored S-SFH CC value with the newly received S-SFH CC value (S603).

As a result of comparing the CC values, when there is no difference between the two values (CC difference = 0), it is determined that there is no change of the S-SFH, and the decoding of all the S-SFH IEs is omitted (S605).

As a result of comparing the CC values, when the difference between the two values is greater than 1 (CC difference> 1), the UE determines that two or more S-SFH IEs have changed and performs decoding on all S-SFH IEs ( S607). After decoding for all S-SFH IEs, the UE stores the changed S-SFH CC values (S817).

As a result of comparing the CC values, when the difference between the two values is 1 (CC difference = 1), the UE changes the S-SFH SP IE corresponding to a bit position indicating a change in the newly received S-SFH CB. It determines with the IE and decodes and updates the corresponding SP IE (S811).

Thereafter, the terminal stores the changed S-SFH CC value (S817).

The UE may update the system information by using the scheduling periodicities of the respective S-SFH SPs together with the values of the change count and the change bitmap.

Period information of the S-SFH SP including the scheduling period information is (1) transmitted through the P-SFH, and (2) delivered through a specific S-SFH SP in which scheduling periodicities information of other S-SFH SPs is transmitted. (I.e., including its own periodic information), (3) MAC management messages delivered by the network entry procedure (e.g., RNG-REQ / RSP, SBC-REQ / RSP, REG-REQ / RSP). ), Or (4) a method in which a fixed period is defined and delivered to the terminal.

The UE can know the transmission period of each S-SFH SP explicitly through one of the four methods mentioned above, by implicitly receiving at least two times each S-SFH SP implicitly the transmission period of each S-SFH SP It can be seen. The terminal determines that the information is valid until the transmission period information of each of the recognized S-SFH SPs is changed.

9 is a diagram illustrating an S-SFH update process of a sleep mode / idle mode terminal according to one embodiment of the present invention.

As shown, the UE cannot receive the changed S-SFH SP 901 because it is a non-listening interval in superframe 1 to which the changed S-SFH SP is transmitted, and is a listening section in superframe 2, and superframe 3 and Also in 4, it enters the non-listening section.

As such, when the terminal in the sleep / idle state does not receive all of the changed S-SFH SP (s) during the listening interval, the corresponding terminal uses the transmission period information of the changed S-SFH SP (s) and uses the unavailable interval (power). saving / sleep interval) must occur in the next superframe in which the corresponding S-SFH SP (s) are transmitted. It should preferably occur in the next first superframe in which the S-SFH SP (s) are transmitted. That is, the UE does not have to occur in the superframe in which only the S-SFH SP (s), which need not be updated using the changed transmission cycle information of the S-SFH SP (s), are transmitted. After updating the corresponding S-SFH SP (s), the terminal may power off one or more physical devices (power saving state) for the remaining unavailable interval or perform other tasks not requiring communication with the base station.

Assuming that the terminal currently stores CC 25 and CB "000", and the unavailable interval and listening interval of the terminal is determined as shown in Figure 9, the terminal wakes up in the second superframe and decodes the P-SFH, S-SFH You will notice that SP 1 has changed. However, the changed S-SFH SP1 is not transmitted in the super frame 2 corresponding to the listening interval. Therefore, if it can be seen that the transmission time information of the S-SFH SP 1 is transmitted in the fourth superframe, the UE is included in the unavailable interval, but the fourth superframe occurs in the fourth superframe, the corresponding S-SFH SP 1 Decode and update.

If the S-SFH SP (s) is not received in the superframe predicted that the S-SFH SP (s) are transmitted within the unavailable interval using the changed period information of the S-SFH SP (s), The terminal must remain awake until all of the corresponding S-SFH SP (s), so it should not switch to the power saving state. If the UE first receives transmission period information of the S-SFH SPs before receiving the changed S-SFH SP (s), the UE may use the corresponding transmission period information to update the changed S-SFH SP (s). .

Hereinafter, a method of transmitting scheduling periodicity information of each SP and a method of updating system information through the same so that the UE can efficiently identify the transmission positions of the S-SFH SPs will be described.

If the scheduling period information includes only the transmission periods of the respective S-SFH SPs, the UE must know at least one transmission position of each S-SFH SPs so that each S-SFH SPs can be transmitted in which superframe. In addition, when the transmission period of the S-SFH SPs is changed, the terminal should determine the transmission position of the corresponding S-SFH SPs at least once, even though the system information included in the corresponding S-SFH SPs has not been changed. To this end, a problem arises in that the terminal needs to perform scanning in every superframe unit until the terminal determines the transmission time. This frequent scanning operation is particularly inefficient for terminals that switch to sleep / idle mode to minimize power consumption.

In the present invention, so that the UE can efficiently determine the transmission location of the S-SFH SP, the base station to inform the terminal including the transmission offset information of the S-SFH SP as well as the transmission period information of the S-SFH SP Suggest. The transmission period means at what intervals each S-SFH SP is transmitted, and the transmission offset indicates how far from the superframe the S-SFH SPs are transmitted. The transmission period and the transmission offset information may be expressed for each S-SFH SP and may be expressed in a table form.

Table 1 below is an example of expressing transmission period information of S-SFH SPs composed of 1 bit in a table form.

Periodicity configuration index description 0 SP 1-40ms, SP 2-80ms, SP 3-160ms One SP 1-80ms, SP 2-160ms, SP 3-320ms

As shown in Table 1, in the case of the transmission period setting index 0, SP1 is transmitted in 40ms, SP2 is transmitted in 80ms, and SP3 is transmitted in 160ms. In the case of the transmission period setting index 1, SP1 is transmitted in units of 80ms, SP2 is transmitted in units of 160ms, and SP3 is transmitted in units of 320ms.

In addition, the transmission offset information may be defined in a table form according to the transmission period setting.

10 is a diagram illustrating transmission offset values when transmission offset information is transmitted through a P-SFH when the transmission period setting index is 0.

In the case of FIG. 10, there may always be an offset set having the same value regardless of the starting superframe position of each S-SFH SP. If the transmission period of the superframe is 20 ms and the transmission period setting index is 0, as shown, there may be eight sets of transmission offset sets. That is, the transmission offset set corresponding to the total number of eight cases from superframes # 0 to # 7 is continuously repeated. Accordingly, transmission offset information for representing eight sets of transmission offsets may be configured in a 3-bit offset configuration.

Referring to FIG. 10, SP1 is transmitted through superframe # 0, SP2 is set to an offset value of 1 to indicate that it is transmitted from a next superframe (superframe # 1), and SP3 is a current superframe (superframe). The offset value is set to 3 to indicate that it is transmitted in the third superframe (superframe # 3) from # 0). The terminal may determine the exact transmission position of each SP by referring to the transmission offset information.

11 is a diagram illustrating transmission offset values when transmission offset information is transmitted through a P-SFH when the transmission period setting index is 1;

In the case of FIG. 11, there may be offset sets of different values according to the starting superframe position of each S-SFH SP. At this time, since the UE can know the scheduling time of the S-SFH SPs using the transmission period / offset configuration index and the S-SFH size, the base station needs to transmit the S-SFH Scheduling information bitmap. There may not be. If no S-SFH is transmitted, the S-SFH size in the P-SFH has a value of zero. If the S-SFH size is not 0, the UE decodes the corresponding S-SFH SP, and then determines which SP by looking at the S-SFH SP type (index) value of the corresponding S-SFH SP. At this time, the base station should transmit the S-SFH SP type (index) field in each S-SFH SP information element (IE). The UE may know when the corresponding S-SFH SP is to be transmitted through the transmission period value of the corresponding S-SFH SP. In addition, the UE can determine the transmission position of the corresponding S-SFH SPs through the transmission offset value without decoding other S-SFH SPs.

12 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP1 when the transmission period setting index is 0.

In the case of FIG. 12, there may always be an offset set having the same value regardless of the starting superframe position of each S-SFH SP. If the transmission period of the superframe is 20 ms and the transmission period setting index is 0, as shown, there may be four sets of transmission offset sets. That is, the transmission offset set corresponding to the total number of four cases of superframes # 0, # 2, # 4, and # 6 is repeatedly repeated. Accordingly, transmission offset information for representing four sets of transmission offsets may be configured in a 2-bit offset configuration. In this case, the 2-bit offset configuration may include an offset value for S-SFH SP1.

Table 2 shows a 2-bit offset configuration transmitted through S-SFH SP1 when the transmission period setting index is 0.

Offset configuration index description 00 SP2-1, SP3-2 01 SP2-2, SP3-1 10 SP2-1, SP3-4 11 SP2-2, SP3-3

13 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP1 when the transmission period setting index is 1;

In the case of FIG. 13, since offset sets of different values may exist depending on the starting superframe position of each S-SFH SP, all offset sets according to the starting superframe position should be represented.

As shown, for example, when SP1 is transmitted in superframe # 0, offset information indicating that SP2 and SP3 are transmitted after one superframe and after two superframes, respectively, is transmitted through SP1, thereby allowing the terminal to transmit SP2 and SP3. It is possible to determine the exact transmission position of.

14 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP2 when the transmission period setting index is 0.

In the case of FIG. 14, there may always be an offset set having the same value regardless of the starting superframe position of each S-SFH SP. When the transmission period of the superframe is 20 ms and the transmission period setting index is 0, as shown, there may be two sets of transmission offset sets. That is, the transmission offset set corresponding to the total number of two cases of superframes # 1 and # 5 is repeatedly repeated. Accordingly, transmission offset information for representing two sets of transmission offsets may be configured in a 1-bit offset configuration. In this case, the 1-bit offset configuration may include an offset value for S-SFH SP2.

Table 3 shows a 1-bit offset configuration transmitted through S-SFH SP2 when the transmission period setting index is 0.

Offset configuration index description 0 SP1-1, SP3-2 One SP1-1, SP3-5

15 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP2 when the transmission period setting index is 1;

In the case of FIG. 15, since offset sets having different values may exist according to starting superframe positions of each S-SFH SP, all offset sets according to starting superframe positions should be represented.

As shown, for example, when SP2 is transmitted in superframe # 1, offset information indicating that SP1 and SP3 are transmitted after three superframes and after one superframe, respectively, is transmitted through SP2, thereby allowing the terminal to transmit SP1 and SP3. It is possible to determine the exact transmission position of.

16 is a diagram illustrating transmission offset values when transmission offset information is transmitted through S-SFH SP3 when the transmission period setting index is 0.

In the case of FIG. 16, there may always be an offset set having the same value regardless of the starting superframe position of each S-SFH SP. If the transmission period of the superframe is 20 ms and the transmission period setting index is 0, as shown, there may be one case of a number of transmission offset sets. That is, the transmission offset set corresponding to the total number of one cases of the superframe # 3 is continuously repeated. Accordingly, the transmission offset information for representing one transmission offset set may be configured in a 1-bit offset configuration. In this case, the 1-bit offset configuration may include an offset value for S-SFH SP3.

However, when the transmission period setting index is 1, the transmission offset values when the transmission offset information is transmitted through S-SFH SP3 may have offset values having different values depending on the starting superframe position. All offset sets in accordance with must be represented. There may be a total of 15 offset sets according to the position of the starting superframe. Table 4 below shows a 4-bit offset configuration transmitted through S-SFH SP3 when the transmission period setting index is 1.

Offset configuration index description 0000 SP1-1, SP2-2 0001 SP1-1, SP2-3 0010 SP1-1, SP2-4 0011 SP1-1, SP2-6 0100 SP1-1, SP2-7 0101 SP1-2, SP2-1 0110 SP1-2, SP2-3 0111 SP1-2, SP2-4 1000 SP1-2, SP2-5 1001 SP1-2, SP2-7 1010 SP1-3, SP2-1 1011 SP1-3, SP2-2 1100 SP1-3, SP2-4 1101 SP1-3, SP2-5 1110 SP1-3, SP2-6

FIG. 17 is a diagram illustrating one embodiment of an integrated set of transmit offsets delivered via S-SFH SP3.

As shown, offset sets corresponding to each transmission period setting index may be configured in the form of one unified table. In this case, '0' of index 0 and '0000' of index 1, which are the same set of values, may be integrated by omitting one of the duplicated values.

According to an embodiment of the present invention, the transmission offset information may be in the form of simplified information rather than explicit location information. That is, the simplified transmission offset information is expressed in a form of informing which S-SFH SP transmission period for transmitting the transmission period and the transmission offset information by n equally and indicating in which section among the n equal intervals. .

18 is a diagram illustrating simplified transmission offset information under the assumption that the transmission period of S-SFH SP 3 is divided into two when the transmission period and transmission offset information are transmitted through S-SFH SP3.

Referring to FIG. 18, since S-SFH SP 1 is the first interval among the intervals in which the first transmission after the transmission time (Superframe # 2) of S-SFH SP 3 is divided into two, the offset of S-SFH SP 1 is It has a value of zero. If the S-SFH SP1 needs to be updated, the UE receives the S-SFH SP3 in superframe # 2 and then continues scanning to receive the SP1. Since the S-SFH SP2 is the second interval among the intervals in which the first transmission after the transmission time of the S-SFH SP3 (Superframe # 2) is divided into two, the offset of the S-SFH SP2 has a value of 1. If the S-SFH SP2 needs to be updated, the UE receives the S-SFH SP3 and performs scanning from the second section to receive the SP2. In this case, the terminal may perform micro sleep in the first interval.

According to another embodiment of the present invention, the base station may inform how far away from the superframe the S-SFH SPs are transmitted in the transmission period information.

FIG. 19 is a diagram illustrating an embodiment of informing transmission period and transmission offset information of S-SFH SPs.

As shown, since S-SFH SP1 is transmitted in the 3rd and 10th superframes, S-SFH SP1 is transmitted 3 superframes earlier from Superframe # 6, which is the S-SFH SP3 transmission position, and is transmitted in 7 superframe periods. . Accordingly, the base station delivers -3 as transmission offset information for S-SFH SP1 and 7 as transmission period information. On the other hand, since S-SFH SP2 is transmitted in the eighth superframe, S-SFH SP2 is transmitted after two superframes from superframe # 6, which is the S-SFH SP3 transmission position. Therefore, the base station transmits 2 as transmission offset information for S-SFH SP2. Upon receiving the S-SFH SP3 including this information, the UE can know the transmission positions of the S-SFH SP1 and the S-SFH SP2 without a separate scanning operation. In this case, the transmission offset information may indicate the positions of S-SFH SP1 and S-SFH SP2 to be transmitted from the S-SFH SP3 transmission position.

According to an embodiment of the present invention, the terminal may update the changed system information by using the scheduling period information of each S-SFH SP. That is, if the S-SFH SP is not received in the superframe predicted that the changed S-SFH SP is transmitted within the unavailable interval (power saving / sleep interval) using the transmission period and the transmission offset information, it is the corresponding S-SFH. This may be because the transmission period of the SP has been changed, which means that the S-SFH SP3 transmitting the transmission period has been changed. In this case, according to an embodiment of the present invention, the terminal operates in a normal mode until it receives all changed S-SFH SPs and does not switch to a power saving state. The terminal checks the P-SFH transmitted every superframe until the corresponding S-SFH SP is received.

If the scheduling transmission period information is received before receiving the changed S-SFH SP, the terminal may use the information to update the changed S-SFH SP. That is, the terminal may skip scanning a superframe in which only the S-SFH SP that does not need to be updated is transmitted.

20 is a diagram illustrating an embodiment of S-SFH update when a corresponding S-SFH SP is not received in a superframe scheduled to transmit a changed S-SFH SP.

First, it is assumed that the most recent CC received from the base station and stored in the terminal is 25, and the CB is "000".

After the UE recognizes that the S-SFH SP1 and SP3 have been changed through the CB in the superframe # 1, the S-SFH SP1 is transmitted in the superframe # 5 using the current transmission period and the transmission offset information and the S-SFH Predict that SP3 will be transmitted in superframe # 10. If superframes to which the corresponding S-SFH SPs are transmitted are included in an unavailable interval (power saving / sleep interval), the UE may wake up in superframe # 5 while maintaining a power saving state. However, when the S-SFH SP1 is not received in the superframe # 5, the UE continuously checks the P-SFH by continuously performing a scanning operation to receive the S-SFH SP1 and the SP3 from the superframe # 6. The UE may know that S-SFH SP1 and SP3 are not transmitted from superframes # 6 to # 8 through the SFH scheduling information bitmap of the P-SFH. Thereafter, the UE receives S-SFH SP1 in superframe # 9 and S-SFH SP3 in superframe # 10.

FIG. 21 is a diagram illustrating another embodiment of S-SFH update when a corresponding S-SFH SP is not received in a superframe scheduled to transmit a changed S-SFH SP.

In the same situation as in FIG. 20 described above, when the UE wakes up in superframe # 5 and expects to receive S-SFH SP1, but no S-SFH SP1 is received, S-SFH SP1 and SP3 from superframe # 6 thereafter. In order to receive the P-SFH, the scanning operation is continued. In this case, the UE may obtain the transmission period and the transmission offset information of the S-SFH SP1 by receiving the S-SFH SP3 in the superframe # 8 before receiving the S-SFH SP1 in the superframe # 10. Accordingly, the UE does not need to check the P-SFH transmitted in the superframe # 9, and it can be seen that the S-SFH SP1 is transmitted in the superframe # 10 using the information.

FIG. 22 is a diagram illustrating another embodiment of S-SFH update when a corresponding S-SFH SP is not received in a superframe scheduled to transmit a changed S-SFH SP.

As shown, after recognizing that the corresponding S-SFH SP is not received in the superframe to which the changed S-SFH SP is to be transmitted, the UE may wish to first receive the S-SFH SP3. As in the previous embodiment, it is assumed that the most recently received CC stored in the terminal by the base station is 25, the CB is "000". After the UE recognizes that the S-SFH SP1 and 3 have been changed through the CB in the superframe # 1, the S-SFH SP1 is transmitted in the superframe # 5 using the current transmission period and the transmission offset information and the S-SFH Predict that SP3 will be transmitted in superframe # 8. If superframes to which the corresponding S-SFH SPs are transmitted are included in an unavailable interval (power saving / sleep interval), the UE may wake up in superframe # 5 while maintaining a power saving state. However, if the S-SFH SP1 is not received in the superframe # 5, the UE does not perform a scanning operation for checking the P-SFH from the superframe # 6 thereafter, and is scheduled to transmit the S-SFH SP3. Check only Superframe # 8. The UE checks the transmission period and the transmission offset information of the SP1 transmitted through the S-SFH SP3 in the superframe # 8 to determine that the S-SFH SP1 is transmitted in the superframe # 10, and wakes up again in the superframe # 10 to the S-SFH. Receive SFH SP1.

According to another embodiment of the present invention, when the transmission period of a particular S-SFH SP (s) is changed, the base station may transmit the S-SFH SP not only in the transmission period but also before the change period for a certain period.

FIG. 23 is a diagram illustrating an embodiment of S-SFH SP update when a scheduling transmission period is changed.

It is assumed that the most recent CC received from the base station and stored in the terminal is 25, and the CB is "000". After the UE recognizes that the S-SFH SP1 and 3 have been changed through the CB in the superframe # 1, the S-SFH SP1 is transmitted in the superframe # 5 using the current transmission period and the transmission offset information and the S-SFH Predict that SP3 will be transmitted in superframe # 8. If superframes to which the corresponding S-SFH SPs are transmitted are included in an unavailable interval (power saving / sleep interval), the UE may wake up in superframe # 5 while maintaining a power saving state.

The UE receives S-SFH SP1 in superframe # 5 and receives S-SFH SP3 in superframe # 8. At this time, the changed transmission period and transmission offset information of SP1 can be checked through SP3 in superframe # 8. That is, the UE checks the changed transmission period and the changed transmission offset information of the SP1 transmitted through the SP3 in the superframe # 8, and confirms that the S-SFH SP1 is transmitted in the superframe # 10 and the transmission period is y, thereby allowing the normal S- SFH SP1 may be received.

FIG. 24 is a diagram illustrating another embodiment of S-SFH SP update when a scheduling transmission period is changed.

When the transmission period of the specific S-SFH SP (s) is changed, the base station may transmit the S-SFH SP3 in the superframe corresponding to the previous period for a predetermined period.

It is assumed that the most recent CC received from the base station and stored in the terminal is 25, and the CB is "000". After the UE recognizes that the S-SFH SP1 and 3 have been changed through the CB in the superframe # 1, the S-SFH SP1 is transmitted in the superframe # 5 using the current transmission period and the transmission offset information and the S-SFH Predict that SP3 will be transmitted in superframe # 8. If superframes to which the corresponding S-SFH SPs are transmitted are included in an unavailable interval (power saving / sleep interval), the UE may wake up in superframe # 5 while maintaining a power saving state.

In this case, the UE may receive SP3 instead of S-SFH SP1 in superframe # 5, and the S-SFH SP1 may be transmitted in superframe # 10 through the received S-SFH SP3. Accordingly, the S-SFH SP1 changed in the superframe # 10 may be normally received by checking the transmission cycle and the transmission offset of the changed S-SFH SP1 through the SP3.

25 is a block diagram schematically illustrating a configuration of an apparatus for updating system information according to an embodiment of the present invention.

The apparatus includes a transmitter 10, a receiver 20, a decoder 30, a controller 40 and a memory 50.

The receiver 20 receives system change information indicating whether to change the system information and the system information from the base station through the superframe header.

The controller 40 updates the system information with reference to the system change information received through the receiver 20.

The system change information includes the aforementioned CC and CB, and the CC and CB received from the base station are stored and managed in the memory 50.

In addition, scheduling periodicity information indicating a transmission period of a subpacket is received through a P-SFH or a specific S-SFH SP, and the controller 40 is a superframe corresponding to the scheduling period information. If the received subpacket does not receive the changed system information, the mode is controlled to operate in the normal mode (wake up) until the corresponding subpacket is received.

As described above, the device according to the present invention includes software and hardware necessary for implementing the technical idea of the present invention, for example, an output device (display, speaker, etc.), an input device (keypad, microphone, etc.), memory, Basically includes a transceiver (RF module, antenna, etc.). Such components are obvious to those skilled in the art, and detailed descriptions thereof will be omitted.

On the other hand, the method according to the invention described so far may be implemented in software, hardware, or a combination thereof. For example, the method according to the present invention may be stored in a storage medium (eg, mobile terminal internal memory, flash memory, hard disk, etc.) and may be stored in a processor (eg, mobile terminal internal microprocessor). It may be implemented as codes or instructions in a software program that can be executed by.

In the above, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary and will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (15)

In the system information update method of a receiver for receiving data through a superframe,
Receiving system change information indicating whether the system information is changed from the base station through the superframe header, and
Updating the system information with reference to the system change information,
The superframe header includes a first superframe header including the system change information, and a second superframe header including at least one subpacket including the system information.
Scheduling periodicity information indicating a transmission period of the subpacket is received through the first superframe header or one specified subpacket,
If the receiver does not receive a subpacket through which the changed system information is transmitted in the superframe corresponding to the scheduling period information, the receiver does not enter the sleep or idle mode until the subpacket is received. Way. The method of claim 1,
The second superframe header is composed of three subpackets having different transmission periods,
The system change information includes bitmap information consisting of three bits indicating a change state of each system information included in the three subpackets, and the bit is changed when system information included in a specific subpacket is changed. And bits of the corresponding position of the map are toggled or set to bit value 1. The method of claim 1,
And the system change information includes a change counter having a value of any one of 16 numbers and increasing by one whenever any value of the subpacket including the system information is changed. The method of claim 3, wherein
The system change information further includes bitmap information composed of at least one or more bits indicating a change state of each system information included in the at least one subpacket.
The updating of the system information may include comparing the previously stored change counter with the received change counter and decoding and updating the changed system information with reference to the bitmap information when a difference between the two values occurs. The method of claim 1,
And transmitting offset information indicating that the subpacket is transmitted through a superframe spaced apart by a superframe interval from the superframe in which the scheduling period information is transmitted. In the system information update method of a receiver for receiving data through a superframe,
Receiving system change information indicating whether the system information is changed from the base station through the superframe header, and
Updating the system information with reference to the system change information,
The superframe header includes a first superframe header including the system change information, and a second superframe header including at least one subpacket including the system information.
Scheduling periodicity information indicating the transmission period of the subpacket is received through one specified subpacket,
When the receiver does not receive a subpacket through which the changed system information is transmitted in the superframe corresponding to the scheduling period information, the receiver operates in the normal mode until the receiver receives the specific subpacket through which the scheduling period information is transmitted. Receiving a subpacket and checking a transmission time of a subpacket in which changed system information is transmitted with reference to the scheduling period information included in the specific subpacket. The method of claim 6,
The second superframe header is composed of three subpackets having different transmission periods,
The system change information includes bitmap information consisting of three bits indicating a change state of each system information included in the three subpackets, and the bit is changed when system information included in a specific subpacket is changed. And bits of the corresponding position of the map are toggled or set to bit value 1. The method of claim 6,
And the system change information includes a change counter having a value of any one of 16 numbers and increasing by one whenever any value of the subpacket including the system information is changed. The method of claim 8, wherein the system change information further includes bitmap information including at least one bit indicating a change state of each system information included in the at least one subpacket,
The updating of the system information may include comparing the previously stored change counter with the received change counter and decoding and updating the changed system information with reference to the bitmap information when a difference between the two values occurs. The method of claim 6,
And transmitting offset information indicating that the subpacket is transmitted through a superframe spaced apart by a superframe interval from the superframe in which the scheduling period information is transmitted. In the system information update device,
A receiver for receiving system information from the base station and system change information indicating whether the system information has been changed through a superframe header; And
A controller for updating the system information with reference to the system change information,
The superframe header includes a first superframe header including the system change information, and a second superframe header including at least one subpacket including the system information.
Scheduling periodicity information indicating the transmission period of the subpacket is received through one specified subpacket,
When the controller does not receive a subpacket through which the changed system information is transmitted in the superframe corresponding to the scheduling period information, the controller controls to operate in the normal mode (wake up) until the corresponding subpacket is received. System information update device. 12. The method of claim 11,
The second superframe header is composed of three subpackets having different transmission periods,
The system change information includes bitmap information consisting of three bits indicating a change state of each system information included in the three subpackets, and the bit is changed when system information included in a specific subpacket is changed. And a bit at a corresponding position of the map is toggled or set to bit value 1. 12. The method of claim 11,
And the system change information includes a change counter having a value of any one of 16 numbers and incrementing by one whenever any value of the subpacket including the system information is changed. The method of claim 13,
The system change information further includes bitmap information composed of at least one or more bits indicating a change state of each system information included in the at least one subpacket.
And the controller decodes and updates the changed system information with reference to the bitmap information when a difference between the two values is generated by comparing the previously stored change counter with the received change counter. 12. The method of claim 11,
Update system information, characterized in that received by the receiver further includes transmission offset information indicating that the subpacket is transmitted over a superframe spaced apart from the superframe through which the scheduling period information is transmitted. Device.

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