KR101680660B1 - Method and apparatus of updating for system information in a broadband wireless communication system - Google Patents

Abstract

The present invention relates to a system information updating method of a broadband wireless access system for transmitting and receiving data through a superframe including a first super frame header (P-SFH) and a second super frame header (S-SFH) An information element (IE) of the first super frame header including a scheduling information of the second super frame header and a change count indicating a change of system information included in the second super frame header, And transmitting a superframe including the encoded information element of the first superframe header and the changed system information to the terminal, wherein the change counter included in the superframe changes the system information The change information application indication message indicating the application time of the changed system information is transmitted to the predetermined shoe Frame and is transmitted to the terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for updating system information in a broadband wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to system information update in a broadband wireless communication system, and more particularly, to a method and apparatus for determining a time point when system information transmitted through a Super Frame Header is updated.

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

Essential system information transmitted through the SFH among the system information is periodically updated for continuous communication between the base station and the terminal. The terminal periodically checks whether the essential system information transmitted from the base station is updated, The system information decoding and updating operations must be performed.

However, even if the system information is not changed, when the terminal decodes and updates the system information transmitted through the SFH or the like, unnecessary power consumption of the terminal is caused. In particular, when the terminal is in a sleep mode or an idle mode, when the system information is not changed, the terminal decodes and updates the system information transmitted through the SFH, And thus acts as an inefficient operation.

In addition, when the system information transmitted through the SFH is changed, it is necessary to notify the terminal when the changed system information is applied. However, a specific method is not defined, and even if the terminal determines whether the system information is changed, There is a difficulty in determining the application point of time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an operation method and apparatus for more efficient system information update, which prevents unnecessary system information decoding operations and power consumption of the terminal.

The present invention also provides a method and apparatus for efficiently informing a terminal when a changed system information is applied.

According to an aspect of the present invention, there is provided a method for updating system information, the method comprising the steps of: receiving a Broadband Wireless Access (BWA) message through a superframe including a first superframe header and a second superframe header; A system information update method of a system, the method comprising: receiving a first superframe header including a first superframe header including a second superframe header scheduling information and a change count indicating a change of system information included in the second superframe header; Encoding an information element (IE) of a frame header, and transmitting a super frame including the encoded information element of the first super frame header and the changed system information to the terminal, The change counter is incremented and transmitted according to the change of the system information, and the application of the changed system information A change information indicating that the application instruction message is included in a super frame of a predetermined (所 定) is characterized in that the transmission to the mobile station.

Preferably, the change information application indication message is transmitted through the first superframe header, the second superframe header, or a MAP message.

Preferably, in the method, the change information application indication message is configured with a predetermined count value, and the terminal receiving the change information application indication message transmits the change counter and a counter value of the change information application indication message And determines whether the changed system information is applied or not.

Preferably, in the method, the change information application indication message includes an offset value indicating a time point at which the changed system information is applied.

If the bit value is 0, it indicates that system information corresponding to the change counter is applied in a superframe including the change information application indication message, and if the bit value is 0, When the bit value is 1, indicates that the system information corresponding to the change counter is applied in the next superframe of the superframe including the change information application indication message.

According to another aspect of the present invention, there is provided a system information update method including: receiving a super frame including a first super frame header (P-SFH) and a second super frame header (S-SFH) (S-SFH) includes a scheduling information bitmap, a change count (Chang Count), and a subpacket change bitmap (Change Bitmap) in a system information update method of a broadband wireless access system that transmits and receives data through a superframe Encoding a P-SFH information element (IE); And transmitting the superframe including the encoded P-SFH information element to the UE. The change counter is incremented and transmitted according to the change of the S-SFH sub-packet information element, and the changed S-SFH A change information application indication message indicating the application time of the sub packet information element is included in a predetermined super frame and is transmitted to the terminal.

Preferably, in the method, the S-SFH subpacket (SP) change bitmap is composed of three bits indicating the change state of three subpackets, and when the information element of a specific subpacket is changed, the S- SFH subpacket (SP) Change bits are characterized by toggling the bit at a specific location.

Preferably, in the method, the change information application indication message is delivered through the P-SFH, the S-SFH, or a MAP message.

Preferably, in the method, the change information application indication message is configured with a predetermined count value, and the terminal receiving the change information application indication message transmits the change counter and a counter value of the change information application indication message And determines whether the changed system information is applied or not.

Preferably, the change information application indication message includes a plurality of change information application indication messages or a plurality of change information application indication messages to independently indicate application points of the changed S-SFH sub-packet information elements. And bitmap information represented by the number of bits corresponding to the number of packets.

Preferably, the change information application indication message comprises an offset value indicating an application time point of the changed S-SFH sub-packet information element.

According to another aspect of the present invention, there is provided a system information update method including: receiving a super frame including a first super frame header (P-SFH) and a second super frame header (S-SFH) Receiving a superframe including the P-SFH from a base station, the method comprising the steps of: receiving a superframe including the P-SFH from a base station; Decoding a P-SFH information element (IE) including a scheduling information bitmap, a change count, and a subpacket change bitmap of the S-SFH in the received super frame; Comparing the pre-stored change counter with the received change counter to determine whether the S-SFH sub-packet information element has been changed; Performing a system information update operation with reference to a change information application indication message indicating an application time point of the changed S-SFH sub-packet information element when the S-SFH sub-packet information element is changed.

Preferably, the change information application indication message includes an offset value indicating a predetermined count value or an application time of the changed S-SFH sub-packet information element, and the P- SFH, the S-SFH, or a MAP message.

According to an aspect of the present invention, there is provided a system information update apparatus including a superframe (S-SFH) including a first superframe header (P-SFH) and a second superframe header (S-SFH), a change count (Chang Count), and a subpacket change bitmap (Change Bitmap) of the S-SFH in the system information update apparatus of the broadband wireless access system that transmits / An encoder for encoding a P-SFH information element (IE); SFH subpacket information element is changed, the change counter of the S-SFH is changed to increment by 1 every time the S-SFH subpacket is changed, and the change counter of the S-SFH subpacket information element is changed A controller for controlling the change information application indication message to be included in a predetermined super frame and transmitted to the terminal; And a transmitter for transmitting a superframe including the changed S-SFH sub-packet, the changed S-SFH change counter, and a change information application indication message.

According to an aspect of the present invention, there is provided a system information update apparatus including a superframe (S-SFH) including a first superframe header (P-SFH) and a second superframe header ), Comprising: a change counter of an S-SFH indicating a change of system information from a base station; and a change indicating a change point of a subpacket change bitmap and a time point of application of the changed system information A receiver for receiving a superframe including an information application indication message; A memory for storing a change counter and a subpacket change bitmap of the S-SFH; And a controller for controlling a decoding and updating operation of the S-SFH subpacket by comparing the change counter and the change bitmap stored in the memory with the received change counter and the change bitmap, Is performed by referring to the received change information application indication message.

According to the present invention, when the system information is changed, the time point at which the changed system information is applied can be effectively informed to the terminal without a separate signaling procedure.

Also, there is an effect that an unnecessary system information decoding operation of the terminal and a power consumption according to the operation are prevented, and an operation method and apparatus for updating system information more efficiently are provided.

1 is a diagram schematically showing a frame structure of a high level.
2 is a diagram schematically showing a frame structure of the FDD scheme.
3 is a diagram schematically showing a frame structure of the TDD scheme.
4 is a flowchart sequentially illustrating a process of detecting an information error in a P-SFH received from a base station according to an embodiment of the present invention.
FIG. 5 is a view illustrating an embodiment in which a change information application indication message indicating that changed system information is applied at a common application time point is included in the P-SFH and transmitted.
6 is a diagram illustrating another embodiment in which a change information application indication message indicating that changed system information is applied at a common application time point is included in the P-SFH and is transmitted.
FIG. 7 is a diagram illustrating an embodiment in which a change information application indication message indicating that changed system information is applied at a common application time point is included in a map (MAP) and transmitted.
8 is a diagram illustrating an embodiment in which a change information application indication message is transmitted so that changed system information can be applied to independent application time points.
9 is a diagram illustrating another embodiment in which a change information application indication message is transmitted so that changed system information can be applied to independent application time points.
FIG. 10 is a diagram illustrating an embodiment for delivering an applied version of changed system information through each S-SFH SP.
FIG. 11 illustrates an embodiment of delivering the application offset of changed system information through each S-SFH SP.
12 is a diagram illustrating an embodiment for expressing and applying application information of changed system information in a bit map form.
FIG. 13 is a diagram illustrating a method of informing the BS whether or not the changed system information is applied through repetitive transmission of each S-SFH SP.
14 is a diagram illustrating a method of informing whether a base station applies a changed system information and a time point through repeated transmission of a bit map and an SP indicating repetitive transmission of each S-SFH SP.
FIG. 15 is a diagram illustrating a method for determining a point-in-time of implicitly changed system information through a scheduling bitmap of an S-SFH SP.
16 is a block diagram schematically illustrating the configuration of a base station that performs system information update according to an embodiment of the present invention.
FIG. 17 is a block diagram schematically illustrating a configuration of a UE performing a system information update operation according to an embodiment of the present invention. Referring to FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to 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 and the like.

The terminal of the present invention may be called a subscriber station (SS), a user equipment (UE), a mobile equipment (ME), a mobile station Such as a portable device or a PC, or a vehicle-mounted device.

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

The multiple access scheme applied to the wireless communication system of the present invention can be applied to various wireless communication systems such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Single Carrier- Frequency Division Multiple Access) or other modulation techniques known in the art.

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

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 frame structure of a high level.

As shown in the figure, the frame structure applied to the system of the present invention may be a basic element of a frame of 5 ms, and the frame may be defined as a basic unit of transmission as an interval between preambles. The frame includes 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 the MAC (Medium Access Control) layer, and the TTI can 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 in units of 20 ms, for example. When configuring a super frame, system configuration information and broadcasting information for initial fast cell selection and low latency service are set as a transmission unit, and generally, 2 to 6 frames are allocated to one It consists of super frame. Also, each 5 ms frame is composed of a plurality of sub-frames, and each sub-frame is composed of a plurality of OFDM / OFDMA symbols. Each superframe includes one superframe header (SFH) including a broadcast channel, and SFH is located in the first subframe of the corresponding superframe.

The frame structure may be designed to have a specific frame structure according to the bandwidth of the system channel, the duplex scheme, and the CP (Cyclic Prefix) length.

2 is a diagram schematically showing a frame structure of a Frequency Division Duplex (FDD) scheme.

In the FDD mode, downlink and uplink transmissions are classified in the frequency domain, and all subframes in each frame are both downlink and uplink transmissions. The UE in the FDD mode can access the uplink subframe and simultaneously receive the data burst in an arbitrary downlink subframe.

As shown in FIG. 2, a super frame of 20 ms includes four 5 ms frames (F0, F1, F2, F3), one frame F2 includes eight subframes SF0, SF1, SF2, SF3, SF4, SF5, SF6, and SF7) and an idle time period of 62.86 mu s. Each subframe may be composed of seven OFDM symbols S0, S1, S2, S3, S4, S5, and S6.

3 is a diagram schematically showing a frame structure of a TDD (Time Division Duplex) scheme.

In the TDD mode, downlink and uplink transmissions are classified in the time domain, and uplink transmission time periods are allocated after the downlink transmission time periods, whereby data is transmitted and received through the downlink and uplink.

3, a 20-ms super frame includes four 5-ms frames (F0, F1, F2 and F3), one frame F2 includes eight sub-frames SF0, SF1, SF2, SF3, SF4, SF5, SF6, and SF7) and an idle time period of 62.86 mu s. The frame F2 is composed of consecutive D downlink frames and consecutive U uplink frames determined according to the ratio of DL to UL (D: U), and the ratio of DL to UL is 5: 3 The five subframes SF0, SF1, SF2, SF3, and SF4 are configured as downlink frames and the three subframes SF5, SF6, and SF7 are configured as uplink frames. An idle symbol for distinguishing DL and UL is inserted between the last downlink subframe SF4 and the first uplink subframe SF5 to inform that it is switched from DL to UL. The gap inserted between the downlink and the uplink is referred to as a TTG (transmit transition gap), and the gap inserted between the uplink and the downlink is referred to as a RTG (receive transition gap) And uplink transmission.

The last DL subframe SF4 is composed of five OFDM symbols and the last one Idle symbol S5. The Idle symbol S5 has a role of a transmit / receive transition gap (TTG) .

Hereinafter, the SFH will be described in detail.

In a broadband wireless access system, a super frame header (SFH) transmits system information necessary for communication with a base station to terminals. SFH is located in the first subframe in one superframe, as described with reference to FIG. The SFH can be divided into a primary SFH (P-SFH) to which control information for receiving the SFH is transmitted and an S-SFH (secondary SFH) to which essential control information such as a network entry is transmitted.

The S-SFH can be divided into a plurality of subpackets (hereinafter, referred to as 'SP') according to the type or transmission frequency of system information to be transmitted, and can be divided into three SPs (SP1, SP2, SP3) .

The P-SFH is transmitted every superframe, and includes 4-bit-LSB information indicating the super frame number and information related to the S-SFH. Information related to the S-SFH includes 'S-SFH change count' indicating the currently transmitted S-SFH version, 'S-SFH Scheduling information bitmap' indicating whether or not the S-SFH is transmitted in the corresponding super frame, S-SFH size 'indicating the number of LRUs allocated for transmission,' S-SFH number of repetitions' indicating the transmission format of the S-SFH, 'S-SFH number' SP change bitmap ". The sizes of the 'S-SFH Scheduling information bitmap' and 'S-SFH SP change bitmap' fields are the same as the total number of SPs of the S-SFH.

The S-SFH transmits actual system information and the transmitted system information is divided into three subpackets according to their characteristics, and each of them is referred to as S-SFH SPn (n = 1, 2, 3) . Each of the S-SFH SP information elements (IEs) has different transmission periods, the transmission period of _SP1 is TSP1, the transmission period of _SP2 is _TSP2 , and the transmission period of _SP3 is _TSP3 The transmission period of the subpacket of _TSP < _TSP < _TSP2 < _TSP3 , for example.

In order to maintain continuous communication with the base station, the terminal must update the system information transmitted through the S-SFH. However, decoding and updating the S-SFH in spite of the fact that the system information is unchanged is inefficient in terms of power consumption of the terminal, The terminal according to the present invention operates to decode and update the S-SFH upon changing the system information transmitted through the S-SFH.

Also, the UE must detect an information error in the P-SFH received from the base station before updating the system information transmitted 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 according to an embodiment of the present invention.

The P-SFH includes a 4-bit LSB super frame number, an S-SFH change count (CC), an S-SFH scheduling information bitmap, an S- , 'S-SFH number of repetitions', 'S-SFH SP change bitmap' (hereinafter referred to as CB), and CRC (Cyclic Redundancy Check) for error detection.

In general, the UE calculates the 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. Based on the CRC value thus calculated, the UE determines whether an error has occurred in the information in the P-SFH.

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

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

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

If it is determined that an error has occurred via the CRC check, an error is detected as an error in the corresponding super frame (S417). If it is determined that no error has occurred, an essential network entry (initial network entry) The terminal that has successfully received (DL) synchronization calculates its own super frame number.

Therefore, in step S405, it is determined whether the P-SFH is properly transmitted without error by comparing the super frame number of the P-SFH transmitted by the base station with the super frame number calculated by the P-SFH.

The terminal, which has determined that an error has occurred in the information in the P-SFH, may not take any action by processing an error in the corresponding super frame (S417).

If it is determined that the super frame number in the P-SFH transmitted by the base station is the same as the result of the super frame number comparison calculated by the super frame number, it is determined that there is no error in the corresponding super frame (S407).

If the S-SFH is transmitted in the corresponding superframe, the UE can calculate the CRC for the S-SFH, and if the UE determines that the information in the S-SFH is error free, the UE can perform a normal operation in the corresponding superframe.

Hereinafter, an essential system information update method of the UE through the system information change messages transmitted through the P-SFH will be described.

5 is a diagram illustrating a method of informing the application time of changed system information through the P-SFH.

The S-SFH change count (CC) and the S-SFH SP change bitmap (CB) transmitted through the P-SFH can be changed in units of S-SFH subpackets (SP) by the base station as illustrated.

In FIG. 5, the CC is a change count indicating whether the essential system information transmitted through the S-SFH is changed. SI is a scheduling information bitmap of the S-SFH and is transmitted to the UE in a corresponding superframe S-SFH SP. In addition, CB is a change bitmap of the S-SFH, and indicates the SP whose system information has been changed in the corresponding superframe.

As shown, CC, SI, and CB information of the S-SFH can be transmitted through the P-SFH in the superframe. In the superframe 1, the S-SFH SP1 The SI bitmap is set to '110' so as to indicate that the current CC is equal to 25 in the P-SFH of the superframe 1 and the SP of the scheduled S-SFH is SP1 and SP2, And the CB is assumed to be maintained at '000' in the same manner as the existing CB since there is no SP of the changed S-SFH.

In FIG. 5, the system information belonging to the S-SFH SP IE (s) is changed and the S-SFH change count is increased in the superframe in which the changed S-SFH SP IE is transmitted first. That is, in the superframe 2 at the time of the first transmission of the changed SP1 and SP2, the count increases from 25 to 27 in the CC. At this time, because the count is incremented by SP unit, the two counts are incremented by 27 because the two SPs are changed.

Therefore, the SI bitmap is set to '110' to indicate that the SP of the S-SFH scheduled in the superframe 2 is SP1 and SP2, in the P-SFH of the superframe 2, , CB is transmitted by toggling bit information of the first and second digits to '110' to indicate that SP1 and SP2 have been changed. However, according to a modified embodiment of the present invention, the CB may set changed SPs by setting only the value of the bit corresponding to the S-SFH SP (s) to 1 and setting the remaining bits to 0. In this case, the CB is transmitted with '110' indicating that the SP and the SP2 have been changed, and bit information of the first and second digits is set to '1'.

Since the system information is not changed in the superframe 3 and only the SP1 is scheduled, the CC is held at 27 in the P-SFH of the superframe 3, and the SI bit map is set to indicate that the SP of the scheduled S- Is set to '100', and CB is maintained at '110'.

Meanwhile, the BS determines whether the system information currently being applied is changed or not, as well as the time at which the changed system information should be applied, and informs the terminal of the changed system information. The method of indicating the application time of the system information currently applied by the base station may be performed by notifying a change information application indication message indicating a common application time or application version or by applying application points of a plurality of changed S-SFH sub- A plurality of change information application indication messages may be configured to be independently notified to the terminal.

When informing the application time of the changed system information through a change information application instruction message indicating a common application time or application version, a super frame number or an offset value indicating a specific application time or a Apply It is possible to notify the terminal of the update operation time through the Change Count (ACC) information.

Also, the change information application indication message can be delivered to the terminal through the P-SFH, S-SFH, or MAP (MAP) message.

In the case of the embodiment shown in FIG. 5, the ACC indicating the applied version of the changed system information is included in the P-SFH and transmitted to the terminal, so that the changed system information is configured to be applied to one common application time point.

After transmitting the changed S-SFH SP 1 and SP 2 through the second superframe, the base station changes the ACC from 25 to 27 in order to apply the changed S-SFH SP 1 and SP 2 from the third superframe .

After receiving the changed S-SFH SP 1 and SP 2, the UE recognizes that the changed system information is applied from the third superframe in which the ACC is changed to the same 27 as the CC, and performs the system information application operation.

At this time, the S-SFH SPs having the same version are all subjected to the system information change operation at the same time.

6 is a diagram illustrating another embodiment in which a change information application indication message indicating that changed system information is applied at a common application time point is included in the P-SFH and is transmitted.

In the embodiment of FIG. 5, the CC count increases in units of SP, but in the embodiment of FIG. 6, the CC count increases in units of superframes, and the remaining contents are the same as in FIG. That is, CC increases from 25 to 26 in the superframe 2 at the time of the first transmission of the changed SP1 and SP2.

Therefore, the ACC indicating the changed version of the system information does not increase in units of SP but increases in units of superframes like CC. After transmitting the changed S-SFH SP 1 and SP 2 through the second superframe, From the superframe, the ACC is changed from 25 to 26 in order to apply the changed S-SFH SP 1 and SP 2, and then transmitted.

After receiving the changed S-SFH SP 1 and SP 2, the UE recognizes that the changed system information is applied from the third superframe in which the ACC is changed to 26, which is the same as CC, and performs the system information application operation.

FIG. 7 is a diagram illustrating an embodiment in which a change information application indication message indicating that changed system information is applied at a common application time point is included in a map (MAP) and transmitted.

After transmitting the changed S-SFH SP 1 and SP 2 through the second superframe, the base station transmits the changed S-SFH SP 1 and SP 2 from the third superframe. 26, and transmits it.

At this time, the subframe (s) for transmitting the MAP is preferably defined in advance. That is, for example, the MAP may be defined in advance so as to be transmitted every first or every subframe.

After receiving the changed S-SFH SP 1 and SP 2 in the superframe 2, the UE recognizes that the system information of the changed S-SFH SP 1 and SP 2 is applied from the third superframe in which the ACC transmits the same 26 as the CC And performs system information application operation.

In the embodiment of FIG. 7, the increase of the CC count and the increase of the ACC count are typically performed in units of superframes. However, in the embodiment of FIG. 7 as in the embodiment of FIG. 5, In the case of FIG. Hereinafter, for the sake of convenience, it will be described that the change of the CC is changed in units of SP or superframe. However, it should be noted that both of the methods can be applied to the update operation of the present invention.

8 is a diagram illustrating an embodiment in which a change information application indication message is transmitted so that changed system information can be applied to independent application time points.

After transmitting the changed S-SFH SP 1 and SP 2 through the second superframe, the base station changes the ACC 1 from 25 to 26 in order to apply the changed S-SFH SP 1 from the third superframe and transmits it to the UE.

After receiving the changed S-SFH SP 1 and SP 2 in the superframe 2, the UE recognizes that the system information of the changed S-SFH SP 1 is applied from the third superframe transmitted after the ACC 1 is increased to 26, which is the same as CC , And performs an update operation of the system information.

On the other hand, since the ACC2 in the third superframe still has a value of 25, the UE can recognize that the changed S-SFH SP 2 has not yet been applied, does not perform the system information update operation of the changed SP 2, Is changed to 26 and is received, the system information update operation of SP 2 is performed.

9 is a diagram illustrating another embodiment in which a change information application indication message is transmitted so that changed system information can be applied to independent application time points.

In FIG. 8, CC increases in units of superframes. In FIG. 9, CC increases in units of SP, and therefore, the counter of ACC also increases in units of SP.

The base station transmits the changed S-SFH SP 1 and SP 2 through the second superframe, and CC also increases the number of the changed S-SFHs by 27 in response to the change of SP 1 and SP 2.

Also, in order to apply the changed S-SFH SP 1 from the third superframe, the base station changes the ACC 1 from 25 to 27 and transmits it to the mobile station.

After receiving the changed S-SFH SP 1 and SP 2 in the superframe 2, the UE recognizes that the system information of the changed S-SFH SP 1 is applied from the third superframe transmitted after ACC 1 is increased to 27, which is the same as CC , And performs the application operation of the system information.

On the other hand, since the ACC2 in the third superframe still has a value of 25, the UE can recognize that the changed S-SFH SP2 has not yet been applied, does not perform the system information application operation of the changed SP2, Is changed to 27, the system information application operation of SP 2 is performed.

FIG. 10 is a diagram illustrating an embodiment for delivering an applied version of changed system information through each S-SFH SP.

As shown, the ACC indicating the changed SP application version can be included in each S-SFH subpacket other than P-SFH and transmitted.

The base station transmits ACC including the changed S-SFHs SP 1 and SP 2 through the second superframe.

After receiving the changed S-SFH SP 1 and SP 2, the UE recognizes that the system information of the changed S-SFH SP 1 is not applied in the superframe 2 because the ACC included in the S-SFH SP 1 is 25 .

However, since the ACC included in the S-SFH SP 2 is 27, it recognizes that the system information of the changed S-SFH SP 2 is applied in the superframe 2, and performs system information application operation.

Then, the UE recognizes that the system information of the changed S-SFH SP 1 is applied in the superframe 3 because the ACC included in the S-SFH SP 1 has increased to 27 in the third superframe, and performs the system information application operation .

FIG. 11 illustrates an embodiment of delivering the application offset of changed system information through each S-SFH SP.

The change information application indication message may be represented by an offset indicating the application point of the changed S-SFH sub-packet information element, as shown in FIG.

The base station transmits the changed S-SFH SP 1 and SP 2 through the second superframe.

At this time, each of the S-SFH SPs includes offset information (Apply Superframe Offset) indicating the changed system information application time point.

 After receiving the changed S-SFHs SP 1 and 2, the terminal updates the system of the changed S-SFH SP 1 and 2 from the third superframe, which is the next superframe, since the ASOs included in the S-SFH SP 1 and 2 are 1, Information is applied.

In this case, when the ASO is composed of 1 bit, it indicates that the changed system information is applied in the currently received superframe when the ASO value is " 0b0 ", and the changed system information is applied in the next superframe if it is "0b1 ".

Table 1 below shows an S-SFH ASO comprised of 2 bits according to another embodiment.

SFH ASO description 00  The corresponding S-SFH SP is applied in the current super frame. 01  The S-SFH SP is applied from the next super frame (frame number + 1). 10  The S-SFH SP is applied from frame number + 2. 11  The S-SFH SP is applied from frame number + 3.

As shown in Table 1, if the ASO value in any S-SFH SP transmitted in the third superframe is 0b10, then the S-SFH SP can be applied from the fifth superframe (3 + 2).

At this time, the ASO is included in the P-SFH and is transmitted to the terminal so that the changed system information is applied to one common application time (including only one ASO) or the S-SFH SP is applied to the application time (Including ASO by the total number of S-SFH SPs).

12 is a diagram illustrating an embodiment for expressing and applying application information of changed system information in a bit map form.

As shown in FIG. 12, the change information application instruction message includes a bit map (S-SFH) so that the base station can recognize one common application point or application version of the currently applied S-SFH SP, bitmap (P-SFH).

The bitmap type application indication message may be transmitted through the MAP or each S-SFH SP, or may be applied to different S-SFH SPs at different times.

After transmitting the changed S-SFHs SP 1 and 2 through the second superframe, the base station changes the ACC from 25 to 27 in order to apply the changed S-SFH SP 1 from the third superframe, and transmits ACB (Apply SFH SP 1 of the Change Bitmap) is set to 1, and the first bit corresponding to the S-SFH SP 1 of the Change Bitmap is set to 1.

At this time, since the S-SFH SP3 has not been changed, the existing information is applied as it is.

After receiving the changed S-SFHs SP 1 and 2 in the superframe 2, the UE transmits the changed S-SFHs 1 and 2 from the third superframe in which ACC is equal to CC and the bit corresponding to the S-SFH SP 1 of ACB is set to 1 - recognizes that the system information of SFH SP 1 is applied, and performs system information application operation.

On the other hand, in the super frame 3, since the value of the bit corresponding to the S-SFH SP2 of the ACB is set to 0, the UE can recognize that the system information of the changed S-SFH SP 2 is not yet applied. At this time, it is preferable that the ACC is not changed until the changed system information of the S-SFH SP 2 is applied. That is, the base station should not change the ACC until all of the S-SFH SPs having the same version are applied.

FIG. 13 is a diagram illustrating a method of informing the BS whether or not the changed system information is applied through repetitive transmission of each S-SFH SP.

The BS may continuously transmit the same S-SFH SP repeatedly in order to increase the probability of receiving the system information of the UE located at the edge of the cell in consideration of the cell coverage.

In FIG. 13, S-SFH SP 1 is transmitted three times (301, 302, 303) and S-SFH SP 2 is transmitted twice (311, 312).

In the case of a terminal located adjacent to the base station, it is highly likely that both the S-SFH SP 1 301 and the SP 2 311 transmitted in the first superframe are normally decoded, but the terminal located far away from the base station SFH SP 1 (302) and SP 2 (312) transmitted in the second superframe, it is highly likely to decode system change information normally.

At this time, the base station may express information indicating whether the transmitted system information is the first or last repetition in a bitmap form by the total number of S-SFH SPs or the total number of S-SFH SPs transmitted in the corresponding superframe.

For example, if S-SFH SP 1 and SP 2 are transmitted in some superframe, the first bit may be assigned to S-SFH 1 and the second bit may be assigned to S-SFH 2.

14 is a diagram illustrating a method of informing whether a base station applies a changed system information and a time point through repeated transmission of a bit map and an SP indicating repetitive transmission of each S-SFH SP.

Referring to FIG. 14, the BS transmits the changed S-SFH SP 1 401 and SP 2 412 through a second superframe. It is assumed that the S-SFH SP 1 is transmitted twice (401, 402) through the super frame 2 and the super frame 3, and the S-SFH SP 2 is transmitted (412) once through the super frame 2.

Therefore, in the second superframe, the first bit of LRI (Last Repetition Indication) is set to "0" since it is the first transmission by S-SFH SP 1, and the second bit is set to S- It is set to "1 ".

Since the base station repeatedly transmits the changed S-SFH SP 1 in the third superframe for the last iteration 402, the base station sets the first bit of the LRI to "1" and transmits it.

After receiving the incremental change count and modified S-SFH SP 1 and 2 through Superframe 2, the UE shall apply the corresponding S-SFH SP from the superframe with the LRI bit set to 1 or the next superframe . That is, S-SFH SP 1 is applied from the third or fourth superframe, and S-SFH SP 2 is applied from the second or third superframe.

According to another modified embodiment, if the change count is different and the FRI is set to 1 in the case of an FRI (first repetition indication) instead of an LRI, the UE determines that a previous version of the S-SFH SP is applied. At this time, if it is the first repetition transmission and the last repetition transmission, it should be set as the last repetition transmission.

FIG. 15 is a diagram illustrating a method for determining a point-in-time of implicitly changed system information through a scheduling bitmap of an S-SFH SP.

The implicit method described in the embodiment of FIG. 15 implies that the UE implicitly recognizes whether or not to apply the S-SFH SP through the S-SFH SP scheduling bitmap, without transmitting any separate information on the currently applied system information .

As described with reference to FIGS. 13 and 14, the base station can repeatedly transmit the same S-SFH SP repeatedly for cell coverage.

The UE can recognize that the S-SFH SP corresponding to the position where the S-SFH SP scheduling information (SI) is changed from "1" to "0" in the consecutive superframe is the last repeat transmission in the immediately preceding superframe.

The base station transmits the changed S-SFH SP 1 and SP 2 through the second super frame, S-SFH SP 2 is transmitted (1511) once through the super frame 2, and S-SFH SP 1 transmits the changed super frame 2 and super Is repeated twice through frame 3 (1501, 1502).

After receiving the changed S-SFHs SP 1 and 2, the UE recognizes that the value of the bit corresponding to the S-SFH SP2 of the SI is changed from "1" in the second superframe to "0" in the third superframe , And recognizes that the S-SFH SP 2 transmitted in the second superframe is the last iteration.

Therefore, the changed S-SFH SP 2 is applied from the second or third superframe.

16 is a block diagram schematically illustrating the configuration of a base station that performs system information update according to an embodiment of the present invention.

The base station includes a receiver 1601, a transmitter 1603, an encoder 1605, and a controller 1609.

The encoder 1805 encodes a P-SFH information element (IE) including a scheduling information bitmap, a change count, and a subpacket change bitmap of the S-SFH.

The controller 1809 changes the change counter of the S-SFH to increment by 1 each time the S-SFH subpacket is changed, and changes the S-SFH subpacket change bitmap To toggle the bit at a particular location corresponding to a particular subpacket change. Also, a change information application indication message indicating the application time of the changed S-SFH sub-packet information element is included in a predetermined super frame to be transmitted to the terminal.

The transmitter 1801 transmits a super frame including the changed S-SFH sub-packet, the changed S-SFH change counter, and a change information application indication message to the terminal.

FIG. 17 is a block diagram schematically illustrating a configuration of a UE performing a system information update operation according to an embodiment of the present invention. Referring to FIG.

The terminal includes a transmitter 1701, a receiver 1703, a decoder 1705, a memory 1707, and a controller 1709.

The receiver 1701 receives a superframe including a change counter of the S-SFH indicating a change of the system information from the base station and a subpacket change bitmap and a change information application indication message indicating the application time of the changed system information.

The decoder 1705 receives a P-SFH information element (IE) including a scheduling information bitmap, a change count and a subpacket change bitmap of the S-SFH in the received super frame, .

The memory 1707 stores the S-SFH change counter and the subpacket change bitmap.

The controller 1709 controls the decoding and updating operation of the S-SFH subpacket by comparing the change counter and the change bitmap stored in the memory 1707 with the received change counter and the change bitmap, The update operation is performed with reference to the received change information application indication message.

The apparatus according to the present invention can be applied to various types of apparatuses such as an output device (display, speaker, etc.), an input device (keypad, microphone, etc.) Reception section (RF module, antenna, etc.). These components are obvious to those skilled in the art, and detailed description thereof will be omitted.

Meanwhile, the method according to the present invention described up to now can be implemented by software, hardware, or a combination thereof. For example, a method in accordance with the present invention may be stored in a storage medium (e.g., mobile terminal internal memory, flash memory, hard disk, etc.) &Lt; / RTI &gt; in a software program that can be executed by a computer.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present invention . Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (15)

System information of a broadband wireless access system that transmits and receives data through a superframe including a first superframe header (P-SFH) and a second superframe header (S-SFH) In the update method,
Encoding an information element (IE) of the first super frame header including an S-SFH change count indicating a change of system information included in the second super frame header; and
And transmitting a superframe including the encoded information element of the first superframe header and the S-SFH change count to the UE,
Wherein the S-SFH change count included in the super frame is transmitted by incrementing the counter value according to the change of the system information,
Wherein the S-SFH change count comprises:
Is configured to determine whether the changed system information is applied as compared to the application change count.
How to update system information. The method according to claim 1,
Further comprising transmitting a change information application indication message indicating an application time point at which the changed system information is applied,
The change information application instruction message includes:
Wherein the information is transmitted through the first superframe header, the second superframe header, or a MAP message. delete 3. The method of claim 2,
Wherein the change information application indication message comprises an offset value indicating an application time of the changed system information. 5. The method of claim 4, wherein the offset value comprises 1 bit information,
When the bit value is 0, indicates that system information corresponding to the S-SFH change count is applied in a superframe including the change information application indication message,
When the bit value is 1, indicates that the system information corresponding to the S-SFH change count is applied in a next superframe of a superframe including the change information application indication message. A system information updating method of a broadband wireless access system for transmitting and receiving data through a superframe including a first super frame header (P-SFH) and a second super frame header (S-SFH)
Encoding a P-SFH information element (IE) comprising an S-SFH change count and an S-SFH subpacket change bitmap; And
And transmitting a super frame including the encoded P-SFH information element to a terminal,
The S-SFH change count is incremented and transmitted in response to a change in the S-SFH sub-packet information element,
The S-SFH subpacket change bitmap consists of three bits indicating three subpacket change states,
When the information element of a particular subpacket changes, a particular bit of the S-SFH subpacket change bitmap is toggled,
Wherein the S-SFH change count comprises:
Is configured to determine whether the changed system information is applied as compared to the application change count.
How to update system information. delete The method according to claim 6,
Further comprising transmitting a change information application indication message indicating an application time point at which the changed system information is applied,
The change information application instruction message includes:
(P-SFH), the S-SFH, or a MAP (MAP) message. delete [10] The method of claim 8,
A plurality of S-SFH sub-packet information elements, each S-SFH sub-packet information element comprising a plurality of change information application indication messages or a bitmap ) &Lt; / RTI &gt; information. 9. The method of claim 8,
Wherein the change information application indication message comprises an offset value indicating an application time point of the changed S-SFH sub-packet information element. A system information updating method of a broadband wireless access system for transmitting and receiving data through a superframe including a first super frame header (P-SFH) and a second super frame header (S-SFH)
Receiving a super frame including the P-SFH from a base station;
Decoding a P-SFH information element (IE) including an S-SFH change count and an S-SFH subpacket change bitmap in the received superframe;
Comparing the pre-stored S-SFH change count with the received S-SFH change count to determine whether to change the S-SFH sub-packet information element; And
The S-SFH subpacket change bitmap consists of three bits indicating three subpacket change states,
A specific bit of the S-SFH subpacket change bitmap is toggled when an information element of a specific subpacket is changed. 13. The method of claim 12,
Further comprising receiving a change information application indication message indicating an application time point at which the changed system information is applied,
The change information application instruction message includes:
A predetermined count value or an offset value indicating the application time of the changed S-SFH sub-packet information element,
(P-SFH), the S-SFH, or a MAP (MAP) message. A system information updating apparatus of a broadband wireless access system for transmitting and receiving data through a superframe including a first super frame header (P-SFH) and a second super frame header (S-SFH)
An encoder for encoding a P-SFH information element (IE) including an S-SFH change count and an S-SFH subpacket change bitmap;
A controller for changing the S-SFH change count of the S-SFH to be incremented by 1 each time the S-SFH subpacket changes, and controlling the S-SFH change count to be sent to the terminal, when the S-SFH subpacket information element is changed; And
And a transmitter for transmitting a superframe including the changed S-SFH sub-packet, the changed S-SFH change count of the changed S-SFH, and a change information application indication message,
The S-SFH subpacket change bitmap consists of three bits indicating three subpacket change states,
A specific bit of the S-SFH subpacket change bitmap is toggled when an information element of a specific subpacket is changed. A system information updating apparatus of a broadband wireless access system for transmitting and receiving data through a superframe including a first super frame header (P-SFH) and a second super frame header (S-SFH)
A receiver for receiving an S-SFH change count and a subpacket change bitmap of an S-SFH indicating a change of system information from a base station;
A memory in which an S-SFH change count and a subpacket change bitmap of the S-SFH are stored; And
And a controller for controlling the decoding and updating operations of the S-SFH subpacket by comparing the S-SFH change count and change bitmap stored in the memory with the received S-SFH change count and change bitmap,
The S-SFH subpacket change bitmap consists of three bits indicating three subpacket change states,
A specific bit of the S-SFH subpacket change bitmap is toggled when an information element of a specific subpacket is changed.

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