KR20100092393A - Method and apparatus of updating for system information in a broadband wireless communication system - Google Patents

Abstract

PURPOSE: A method and a device for updating system information in a broadband wireless communication system are provided to effectively transfer a time for applying changed system information to a terminal without a separate signaling procedure. CONSTITUTION: A system encodes an IE(Information Element) of the first super frame header including scheduling information and a change counter of the second SFH(Super Frame Header). The change counter shows a change of system information in the second SFH. The system transmits a super frame including the IE of the first SFH and the changed system information to a terminal. A changed information applying indication message is included in a fixed super frame.

Description

Method and apparatus for updating system information in broadband wireless communication system {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 more particularly, to a method and apparatus for determining a point in time at which 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 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, and the terminal periodically checks whether the essential system information transmitted from the base station is updated or not. Decoding and updating of system information should be performed.

However, even when the system information is not changed, when the terminal decodes and updates the 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, even if the system information is not changed, decoding and updating the system information transmitted through the SFH is a power consumption aspect of the terminal. This results in inefficient operation.

In addition, when the system information transmitted through the SFH is changed, it should be informed to the terminal when the changed system information is applied, but the specific method for this is not defined, even if the terminal determines whether the system information has changed or not changed system information Difficulties exist in determining the time of application.

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

In addition, the present invention provides a method and apparatus for efficiently informing a terminal of a time when changed system information is applied.

System information update method according to an embodiment of the present invention for achieving the above object, a broadband wireless access for transmitting and receiving data through a superframe (Superframe) including a first superframe header and a second superframe header A method of updating system information of a system, the method comprising: a scheduling counter indicating a change of scheduling information of the second superframe header and system information included in the second superframe header; Encoding an information element (IE) of the frame header, and transmitting a superframe including the encoded information element of the first superframe header and the changed system information to the terminal, the information being included in the superframe The change counter is transmitted by increasing a counter value according to the change of the system information, and applying 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, in the above method, the change information application indication message is transmitted through the first superframe header, the second superframe header, or a map (MAP) message.

Preferably, in the above method, the change information application instruction message is configured with a predetermined counter value, and the terminal receiving the change information application instruction message includes a counter value of the change counter and the change information application instruction message. It is characterized by determining whether or not to apply the changed system information by comparing the.

Preferably, in the above method, the change information application indication message is configured with an offset value indicating the application time of the changed system information.

In addition, the offset value is composed of 1 bit information, and when 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. If the bit value is 1, it indicates that system information corresponding to the change counter is applied to the next superframe of the superframe including the change information application indication message.

The system information update method according to another embodiment of the present invention for achieving the above object, the superframe including a first super-frame header (P-SFH) and the second super-frame header (S-SFH) ( A system information updating method of a broadband wireless access system for transmitting and receiving data through a superframe, comprising: a scheduling information bitmap, a change count, and a subpacket change bitmap of an S-SFH Encoding a P-SFH information element (IE); And transmitting a superframe including the encoded P-SFH information element to a terminal, wherein the change counter is incremented and transmitted according to the change of the S-SFH subpacket information element, and the changed S-SFH. The change information application indication message indicating the application time of the subpacket information element is included in a predetermined superframe and transmitted to the terminal.

Preferably, in the above method, the S-SFH subpacket (SP) change bitmap is composed of three bits indicating a change state of three subpackets, and the S-SFH subpacket (SP) change bitmap includes three bits indicating a change state of three subpackets. The bit at a specific position of the SFH subpacket (SP) change bitmap may be toggled.

Preferably, in the method, the change information application indication message, characterized in that delivered through the P-SFH, the S-SFH or MAP (MAP) message.

Preferably, in the above method, the change information application instruction message is configured with a predetermined counter value, and the terminal receiving the change information application instruction message includes a counter value of the change counter and the change information application instruction message. It is characterized by determining whether or not to apply the changed system information by comparing the.

Preferably, in the above method, the change information application instruction message is composed of a plurality of change information application instruction messages or a plurality of sub information so as to independently indicate the application time of the changed plurality of S-SFH subpacket information elements. Characterized in that it is composed of the bitmap (bitmap) information represented by the number of bits (bit) of the number of packets, characterized in that delivered.

Preferably, in the above method, the change information application indication message is configured with an offset value indicating the application time of the changed S-SFH subpacket information element.

System information update method according to another embodiment of the present invention for achieving the above object, a superframe including a first super-frame header (P-SFH) and the second super-frame header (S-SFH) A system information updating method of a broadband wireless access system for transmitting and receiving data through (Superframe), the method comprising: 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 an S-SFH in the received superframe; Comparing the stored change counter with the received change counter to determine whether the S-SFH subpacket information element has changed; If the S-SFH subpacket information element is changed, performing a system information update operation with reference to a change information application indication message indicating a time point at which the changed S-SFH subpacket information element is applied.

Preferably, in the above method, the change information application indication message is composed of a predetermined counter value or an offset value indicating an application time point of the changed S-SFH subpacket information element. It is received through the SFH, the S-SFH or MAP (MAP) message.

System information updating apparatus according to an embodiment of the present invention for achieving the above object, a superframe including a first super-frame header (P-SFH) and the second super-frame header (S-SFH) A system information updating apparatus of a broadband wireless access system for transmitting and receiving data through a network, comprising: a scheduling information bitmap, a change count, and a subpacket change bitmap of an S-SFH An encoder for encoding a P-SFH information element (IE); When the S-SFH subpacket information element is changed, the change counter of the S-SFH is changed to increase by 1 each time the S-SFH subpacket is changed, and indicates the application time point of the changed S-SFH subpacket information element. A controller for controlling a change information application indication message to be included in a predetermined superframe and transmitted to the terminal; And a transmitter for transmitting a superframe including the changed S-SFH subpacket, the change counter of the changed S-SFH, and a change information application indication message.

System information updating apparatus according to an embodiment of the present invention for achieving the above object, a superframe including a first super-frame header (P-SFH) and the second super-frame header (S-SFH) A system information updating apparatus of a broadband wireless access system for transmitting / receiving data through a network, comprising: an S-SFH change counter and a subpacket change bitmap indicating a change of system information from a base station, and a change indicating an application time point of the changed system information A receiver for receiving a superframe including an information application indication message; A memory storing a change counter and a subpacket change bitmap of the S-SFH; And a controller for controlling the decoding and updating operations of S-SFH subpackets by comparing the change counter and the change bitmap stored in the memory with the received change counter and the change bitmap. Is performed with reference to the received change information application indication message.

According to the present invention, when the system information is changed, an effect of effectively notifying the terminal of the time when the changed system information is applied to the terminal without a separate signaling procedure occurs.

In addition, there is an effect that an operation method and apparatus for preventing unnecessary system information decoding operation of the terminal and power consumption thereof and for more efficient system information update are provided.

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 in which a change information application indication message indicating that changed system information is applied at one common application time is included in a P-SFH and transmitted.
FIG. 6 is a diagram illustrating another embodiment in which a change information application indication message indicating that changed system information is applied at one common application point is transmitted in a P-SFH.
FIG. 7 is a diagram illustrating an embodiment in which a change information application indication message indicating that changed system information is applied at one common application time is included in a map MAP and transmitted.
FIG. 8 is a diagram illustrating an embodiment in which a change information application indication message is transmitted so that changed system information may be applied at independent application points.
FIG. 9 is a diagram illustrating another embodiment in which a change information application indication message is transmitted so that changed system information may be applied at independent application points.
FIG. 10 is a diagram illustrating an embodiment of delivering an applied version of modified system information through each S-SFH SP.
FIG. 11 is a diagram illustrating an embodiment of delivering an application offset of changed system information through each S-SFH SP.
FIG. 12 is a diagram illustrating an embodiment in which application information of changed system information is expressed and transmitted in a bitmap form.
FIG. 13 is a diagram illustrating a method in which a base station informs whether and when a changed system information is applied through repeated transmission of each S-SFH SP.
14 is a diagram illustrating a method in which a base station informs whether and when a changed system information is applied through a bitmap indicating repeated transmission of each S-SFH SP and repeated transmission of an SP.
FIG. 15 is a diagram illustrating a method of determining an application time point of an implicitly changed system information through a scheduling bitmap of an S-SFH SP.
16 is a block diagram schematically illustrating a configuration of a base station for performing a system information update operation according to an embodiment of the present invention.
17 is a block diagram schematically illustrating a configuration of a terminal performing a system information update operation 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 superframe header (SFH) including a broadcast channel, and the SFH is located in the first subframe of the superframe.

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. In addition, the SFH may be divided into P-SFH (primary SFH) through which control information for receiving SFH is delivered, and S-SFH (secondary SFH) through which essential control information such as network entry is transmitted.

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

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

The S-SFH carries substantial system information, and the system information delivered is divided into three subpackets according to its characteristics, as described above, and each of them is referred to as S-SFH SPn (n = 1, 2, 3). It is called. Each S-SFH SP information element (IE) has a different transmission period, when the transmission period of _{SP1 is} called T _SP1 , the transmission period of _{SP2 is} called T _SP2 , and the transmission period of _{SP3 is} called T _SP3 , respectively. The transmission period of the subpackets of may be expressed as, for example, T _SP1 <T _SP2 <T _SP3 .

For continuous communication with the base station, the terminal should update the system information delivered through the S-SFH, but even if the system information has not changed decoding and updating the S-SFH 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 when the system information transmitted through the S-SFH is changed.

In addition, the terminal should 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 super frame number', 'S-SFH change count' (hereinafter referred to as 'CC'), 'S-SFH scheduling information bitmap', 'S-SFH size' In addition to the 'S-SFH number of repetitions' and 'S-SFH SP change bitmap' (hereinafter referred to as 'CB'), a cyclic redundancy check (CRC) for error detection may be included.

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 by using a 4bit-LSB super frame number field in the P-SFH even when it is determined that no error occurs in a general P-SFH error detection procedure through a CRC. do.

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 receiving a DL synchronization calculates its own super frame number.

Accordingly, by comparing the super frame number in the P-SFH transmitted by the base station with the super frame number 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 super frame number in the P-SFH transmitted by the base station is the same as the comparison result of the super frame number calculated by the base station, the corresponding superframe is determined to have no error (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 method of updating system information of the terminal through system information change messages transmitted through the P-SFH will be described.

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

As shown, the S-SFH change count (CC) and the S-SFH SP change bitmap (CB) 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 the S-SFH, indicating the SP whose system information has been changed in the corresponding superframe.

As shown, in the superframe, the CC, SI and CB information of the S-SFH can be delivered through the P-SFH. At this point, the CC is 25 and the superframe 1 has not changed the system information in the S-SFH SP1. Assuming that the SP2 is scheduled and delivered, the SI bitmap is set to '110' to indicate that the current CC is equal to 25 in the P-SFH of Superframe 1 and that the SPs of the scheduled S-SFH are SP1 and SP2. Since the CB does not currently have an SP of the S-SFH changed, it is assumed that the CB is maintained as '000' like the existing CB.

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, the count increases from 25 to 27 in superframe 2 when the changed SP1 and SP2 are initially transmitted. 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, the current CC is increased to 27 in the P-SFH of Superframe 2, and the SI bitmap is set to '110' to indicate that the SPs of the S-SFH scheduled in Superframe 2 are SP1 and SP2. The CB is transmitted with the bit information of the first and second digits toggled to '110' to indicate that SP1 and SP2 have been changed. However, according to the modified embodiment of the present invention, the CB may set only the value of the bit corresponding to the S-SFH SP (s) to 1 and set the remaining bits to 0 to indicate changed SPs. Even in this case, the CB is transmitted with a bit information of the first and second digits set to '110' to 1 to indicate that SP1 and SP2 have been changed.

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'.

Meanwhile, the base station determines whether the changed system information is to be applied as well as whether the system information is currently applied and informs the terminal. The method of informing the base station of the application of the currently applied system information is indicated by a change information application instruction message indicating a common application time or application version, or the application time of a plurality of changed S-SFH subpacket information elements, respectively. A plurality of change information application instruction messages may be configured to inform the terminal so that they can be displayed independently.

When a change information application instruction message indicating a common application time or application version is used to indicate when to apply changed system information, a superframe number or offset value indicating a specific application time or an application version indicating an application version is applied. The UE may inform the terminal of the update operation time through the change count (ACC) information.

In addition, the change information application indication message may be delivered to the terminal through a P-SFH, S-SFH or MAP (MAP) message.

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

The base station transmits the changed S-SFH SP 1 and SP 2 through the second superframe, and then changes the ACC from 25 to 27 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 and transmitted to the same 27 as the CC, and performs the system information application operation.

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

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

In the embodiment of FIG. 5, the CC count is increased in units of SPs. In the embodiment of FIG. 6, the CC count is increased in units of superframes. That is, in superframe 2 when the modified SP1 and SP2 are initially transmitted, the CC increases from 25 to 26.

Therefore, the ACC indicating the changed version of the system information does not increase in units of SPs, but increases in units of superframes like the CCs, and after the base station transmits the changed S-SFH SP 1 and SP 2 through the second superframe, In order to apply the changed S-SFH SP 1 and SP 2 from the first superframe, the ACC is changed from 25 to 26 and 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 equal to the CC and applies the system information.

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

The base station transmits the changed S-SFH SP 1 and SP 2 through the second superframe, and then applies the same ACC to 25 to CC through the MAP to apply the changed S-SFH SP 1 and SP 2 from the third superframe. Change to 26 and send.

In this case, it is preferable that the subframe (s) for transmitting the corresponding MAP are predefined. That is, for example, the MAP may be previously defined such that the MAP is transmitted every first or every subframe.

After receiving the changed S-SFH SP 1 and SP 2 in 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 apply the system information.

In the embodiment of FIG. 7, the CC count increases and the ACC count increases in units of superframes, but the CC count increases in units of SPs and the ACC counts in SP, as in the embodiment of FIG. 5. It can also be configured to increase in units. Hereinafter, for convenience of description, the change of CC may be described to be changed in units of SPs or units of superframes. However, it will be apparent that both methods may be applied to the update operation of the present invention.

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

The base station transmits the changed S-SFH SP 1 and SP 2 through the second superframe, and then changes the ACC1 from 25 to 26 to apply to the changed S-SFH SP 1 from the third superframe to the terminal.

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 by increasing the ACC1 to 26 equal to the CC The system updates the system information.

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

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

In FIG. 8, the CC is increased in units of superframes. In FIG. 9, the CC is increased in units of SPs. Accordingly, the counter of the ACC is also increased in units of SPs.

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

In addition, in order to apply the S-SFH SP 1 changed from the third superframe, the base station changes the ACC1 from 25 to 27 and transmits it to the terminal.

After receiving the changed S-SFH SP 1 and SP 2 in Superframe 2, the UE recognizes that the system information of the changed S-SFH SP 1 is applied from the third superframe transmitted by increasing the ACC1 to 27 equal to the CC The application of the system information is performed.

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

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

As shown, the ACC indicating the modified SP application version may be included in each S-SFH subpacket, not the P-SFH, and transmitted.

The base station transmits an ACC to each of the modified S-SFH 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 Superframe 2 since the ACC transmitted in S-SFH SP 1 is 25. .

However, since the ACC transmitted by being included in S-SFH SP 2 is 27, it is recognized that the system information of S-SFH SP 2 changed in superframe 2 is applied, and the system information is applied.

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

FIG. 11 is a diagram illustrating an embodiment of delivering an 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 time of the changed S-SFH subpacket information element, as shown in FIG. 11.

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

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

 After the UE receives the changed S-SFH SP 1 and 2, the ASO included in the S-SFH SP 1 and 2 is 1, respectively, so that the system of the S-SFH SP 1 and 2 changed from the third superframe, which is the next superframe, is received. Recognize that information applies.

At this time, when the ASO is configured with 1 bit, when the ASO value is "0b0", it may indicate that the changed system information is applied in the currently received superframe, and when it is "0b1", it may indicate that the changed system information is applied in the next superframe.

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

SFH ASO description 00  The 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, the S-SFH SP may be applied from the fifth superframe (3 + 2).

In this case, the ASO is included in the P-SFH to be delivered to the terminal, so that the changed system information is configured to be applied to one common application point (including only one ASO) or each of the S-SFH SPs is applied to an independent application point. It may be represented as being configured (including ASO by the total number of S-SFH SP).

FIG. 12 is a diagram illustrating an embodiment in which application information of changed system information is expressed and transmitted in a bitmap form.

As shown in FIG. 12, the change information application indication message may include a bitmap (or a bitmap) to determine whether the base station applies one common application time or application version to the S-SFH SP to which it is currently applied, and whether to apply to each S-SFH SP. bitmap) to be included in the P-SFH for transmission.

The bitmap type application indication message may be delivered through MAP or each S-SFH SP, and even S-SFH SPs having the same version may be applied at different time points.

The base station transmits the changed S-SFH SP 1 and 2 through the second superframe, and then changes the ACC from 25 to 27 to apply the changed S-SFH SP 1 from the third superframe, and applies the ACB (Apply Set the first bit corresponding to S-SFH SP 1 of Change Bitmap) to 1 and send it.

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

After the UE receives the changed S-SFH SP 1 and 2 in superframe 2, the S changed from the third superframe in which the ACC is 27 equal to CC and the bit value corresponding to S-SFH SP 1 of the ACB is set to 1. -Recognize that system information of SFH SP 1 is applied and perform system information application operation.

On the other hand, in superframe 3, since the bit value corresponding to S-SFH SP2 of the ACB is set to 0, the UE may know that the changed system information of 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 S-SFH SP 2 is applied. That is, the base station should not change the ACC until all S-SFH SPs having the same version are applied.

FIG. 13 is a diagram illustrating a method in which a base station informs whether and when a changed system information is applied through repeated transmission of each S-SFH SP.

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

In FIG. 13, S-SFH SP 1 is transmitted three times (301, 302, 303) and transmitted, 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. In the case of receiving the S-SFH SP 1 302 and the SP 2 312 transmitted in the second superframe, there is a high possibility of decoding the system change information normally.

In this case, the base station may express information indicating whether the transmitted system information is the first or the last repetition in the form of a bitmap as much as the total number of S-SFH SPs or as 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 a superframe, the first bit may be allocated for S-SFH 1 and the second bit for S-SFH 2.

14 is a diagram illustrating a method in which a base station informs whether and when a changed system information is applied through a bitmap indicating repeated transmission of each S-SFH SP and repeated transmission of an SP.

Referring to FIG. 14, the base station transmits the modified S-SFH SP 1 401 and SP 2 412 through the second superframe. S-SFH SP 1 is assumed to be transmitted two times (401, 402) is repeated over the superframe 2 and superframe 3, S-SFH SP 2 is assumed to be transmitted 412 once through the superframe 2.

Therefore, in the second superframe, the first bit of the last repetition indication (LRI) is set to "0" because S-SFH SP 1 first transmits, and the second bit is the first and last repetitive transmission of S-SFH SP 2. Is set to "1".

Since the base station performs the last repeated transmission 402 of the S-SFH SP 1 changed in the third superframe, the first bit of the LRI is set to "1" and transmitted.

After receiving the increased change count and the changed S-SFH SPs 1 and 2 through the superframe 2, the UE should apply the corresponding S-SFH SP from the superframe or the next superframe in which the LRI bit is set to 1. Recognize. 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 the first repetition indication (FRI) instead of the LRI, the terminal determines that the previous version of the S-SFH SP is applied. In this case, the first repetitive transmission and the last repetitive transmission should be set to the last repetitive transmission.

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

The implied method described in the embodiment of FIG. 15 means that the base station implicitly recognizes whether or not the base station is applied through the S-SFH SP scheduling bitmap without transmitting the separate information on the currently applied system information. .

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

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

The base station transmits the modified S-SFH SP 1 and SP 2 through the second superframe, S-SFH SP 2 is transmitted once through the superframe 2 (1511), S-SFH SP 1 is superframe 2 and super Two repetitions (1501, 1502) are transmitted over frame 3.

After receiving the changed S-SFH SP 1 and 2, the UE recognizes that the value of the bit corresponding to S-SFH SP2 of the SI is changed to "1" in the second superframe and changed to "0" in the third superframe. The S-SFH SP 2 transmitted in the second superframe is recognized as the last repetitive transmission.

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

16 is a block diagram schematically illustrating a configuration of a base station for performing a system information update operation 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.

When the S-SFH subpacket information element is changed, the controller 1809 changes the change counter of the S-SFH to increase by 1 each time the S-SFH subpacket is changed, and the S-SFH subpacket change bitmap Is changed to toggle a bit at a specific position corresponding to a specific subpacket change. In addition, a change information application indication message indicating the application time of the changed S-SFH subpacket information element is included in a predetermined superframe and controlled to be transmitted to the terminal.

The transmitter 1801 transmits a superframe including the changed S-SFH subpacket, the change counter of the changed S-SFH, and a change information application indication message to the terminal.

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

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 and subpacket change bitmap of the S-SFH indicating a change of system information and a change information application indication message indicating the application time of the changed system information from the base station.

The decoder 1705 includes 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 superframe. Decode

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

The controller 1709 compares the change counter and the change bitmap stored in the memory 1707 with the received change counter and the change bitmap to control decoding and updating operations of the S-SFH subpackets, and according to the system information change. The update operation is performed with reference to the received change information application indication message.

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)

A system information updating method of a broadband wireless access system for transmitting and receiving data through a superframe including a first superframe header and a second superframe header,
An information element (IE) of the first superframe header including a scheduling counter indicating a change of scheduling information of the second superframe header and system information included in the second superframe header. Encoding, and
Transmitting a superframe including the encoded information element of the first superframe header and changed system information to the terminal,
The change counter included in the superframe is transmitted by increasing a counter value according to the change of the system information.
And a change information application instruction message indicating the application time of the changed system information is included in a predetermined superframe and transmitted to the terminal. The method of claim 1, wherein the change information application instruction message,
And the first superframe header, the second superframe header, or a map (MAP) message. The method of claim 1,
The change information application instruction message is composed of a predetermined counter value.
The terminal receiving the change information application instruction message compares the counter value of the change counter and the change information application instruction message to determine whether to apply the changed system information. The method of claim 1,
And the change information application indication message comprises an offset value indicating a time point at which the changed system information is applied. The method of claim 4, wherein the offset value is composed of 1 bit information,
When 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 1, it indicates that system information corresponding to the change counter is applied to the next superframe of the superframe including the change information application indication message. In the system information updating method of a broadband wireless access system for transmitting and receiving data through a superframe including a first superframe header (P-SFH) and a second superframe header (S-SFH),
Encoding a P-SFH information element (IE) including a scheduling information bitmap of the S-SFH, a change counter, and a subpacket change bitmap; And
Transmitting a superframe including the encoded P-SFH information element to a terminal;
The change counter is incremented and transmitted according to the change of the S-SFH subpacket information element.
And a change information application indication message indicating the application time of the changed S-SFH subpacket information element is included in a predetermined superframe and transmitted to the terminal. The method of claim 6,
The S-SFH subpacket (SP) change bitmap is composed of three bits indicating a change state of three subpackets, and the S-SFH subpacket (SP) change bit when an information element of a specific subpacket is changed. A method of updating system information, wherein bits of a specific location of a change bitmap are toggled.
The method of claim 6, wherein the change information application instruction message,
The system information update method, characterized in that delivered through the P-SFH, S-SFH or MAP (MAP) message.
The method of claim 6,
The change information application instruction message is composed of a predetermined counter value.
The terminal receiving the change information application instruction message compares the counter value of the change counter and the change information application instruction message to determine whether to apply the changed system information. The method of claim 6, wherein the change information application instruction message,
A bitmap composed of a plurality of change information application instruction messages or represented by the number of bits as many as the number of subpackets so as to independently indicate when to apply the changed plurality of S-SFH subpacket information elements. System information update method, characterized in that consisting of and delivered. The method of claim 6,
And the change information application indication message is composed of an offset value indicating an application time point of the changed S-SFH subpacket information element. In the system information updating method of a broadband wireless access system for transmitting and receiving data through a superframe including a first superframe header (P-SFH) and a second superframe header (S-SFH),
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 an S-SFH in the received superframe;
Comparing the stored change counter with the received change counter to determine whether the S-SFH subpacket information element has changed;
And when the S-SFH subpacket information element is changed, performing a system information application operation with reference to a change information application indication message indicating a time point at which the changed S-SFH subpacket information element is applied. The method of claim 12, wherein the change information application instruction message,
It is composed of a predetermined counter value or an offset value indicating the application time of the changed S-SFH subpacket information element,
System information update method, characterized in that received through the P-SFH, the S-SFH or 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 superframe header (P-SFH) and a second superframe header (S-SFH),
An encoder encoding a P-SFH information element (IE) including a scheduling information bitmap, a change counter, and a subpacket change bitmap of the S-SFH;
When the S-SFH subpacket information element is changed, the change counter of the S-SFH is changed to increase by 1 each time the S-SFH subpacket is changed, and indicates the application time point of the changed S-SFH subpacket information element. A controller for controlling a change information application indication message to be included in a predetermined superframe and transmitted to the terminal; And
And a transmitter for transmitting the superframe including the changed S-SFH subpacket, the change counter of the changed S-SFH, and a change information application indication message. A system information updating apparatus of a broadband wireless access system for transmitting and receiving data through a superframe including a first superframe header (P-SFH) and a second superframe header (S-SFH),
A receiver for receiving a superframe including an S-SFH change counter and a subpacket change bitmap indicating a change of system information from a base station and a change information application indication message indicating when to apply the changed system information;
A memory storing a change counter and a subpacket change bitmap of the S-SFH; And
And a controller for controlling decoding and updating operations of the S-SFH subpackets by comparing the change counter and the change bitmap stored in the memory with the received change counter and the change bitmap.
And the update operation according to the change of the system information is performed with reference to the received change information application indication message.

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