KR20110071406A - Communication system and method for updating system information - Google Patents

Abstract

PURPOSE: A system information renewal method and a communications system for implementing the same as are provided to recognize whether the system update is processed or not by the element carrier wave. CONSTITUTION: A cell transmits a system information update message for an element carrier wave in which the system information is updated through a downstream link anchor carrier wave. The cell transmits the updated system information of the element carrier wave. A terminal confirms the element carrier wave in the component carrier system information update field included in the system information binding update message received from the cell. The terminal renews the system information of the element carrier wave in the change period.

Description

TECHNICAL SYSTEM AND METHOD FOR UPDATING SYSTEM INFORMATION}

The present invention relates to a method of updating system information and a communication system for performing the same, and more particularly, to a Long Term Evolution (LTE) -A communication system to which a bandwidth extension technology for increasing data transmission rate and a system information is updated in the communication system. It is about a method.

In a Long Term Evolution (LTE) system, a UE needs to acquire system information of a corresponding cell after a cell discovery procedure. In this case, the system information includes downlink and uplink bandwidth, uplink / downlink subframe configuration (UL / DL configuration) for time division duplex (TDD), related parameters for random access, and uplink power control information. System information is transmitted based on two transport channels. In addition, the limited system information (MIB) is transmitted using a broadcast channel (BCH), and includes a DL bandwidth indication, a physical hyiARQ indicator channel (PHICH) configuration, and a system frame number.

A system information block (SIB) including most system information is transmitted through a down-link shared channel (DL-SCH). In addition, whether system information exists on the DL-SCH can be known through transmission of a physical down-link control channel (PDCCH) masked by a System Information Radio Network Temporary Identity (SI-RNTI).

In the LTE system, 8 types of SIBs are defined, from SIB1 to SIB8. SIB1 includes system information change information on whether system information is valid in a current modification period. SIB1 is transmitted in subframe # 5 of the radio frame every 80 ms, and the same information is repeated every 20 ms in subframe # 5.

A modification period means a period in which system information is not changed. Here, the modification period may be expressed by an equation. That is, modification priod may be expressed as modificationPeriodCoeff * defaultPagingCycle, modificationPeriodCoeff may be defined as 2, 4, 8, 16, and defaultPagingCycle = 32 or 64 radio frames.

The system information change information is represented by a system information value tag (systemInfoValueTag) and has a value from 0 to 31. If the system information value tag is different from the previous value, the terminal may know that the current system information is not valid and should receive new system information. A method of updating system information using such a system information block in a terminal will be described with reference to FIG. 1.

1 is a diagram illustrating an update procedure of system information using a system information block according to the related art.

Referring to FIG. 1, in step 100, the terminal receives SIB1, which is a system information block, and determines whether the system information value tag systemInfoValueTag is the same as a previous value in step 110. If the system information value tag (systemInfoValueTag) is not the same as the previous value, the terminal recognizes that the system information changes in the current modification period (120), and receives all system information. Update and exit. However, if the system information value tag (systemInfoValueTag) is the same as the previous value in step 110, the terminal recognizes that the system information does not change in the current modification period (130) and ends.

Next, in the LTE system, the UE may receive whether to update the system information through a paging message. In general, the paging message is used as a message for switching the terminal in the idle mode to the connected mode, but includes information on whether the system information changes during the next modification period. In this case, the information on whether to change the system information represents whether or not the system information changes in the next modification period according to whether the value of the systemInfoModification field included in the paging message is 1 or 0.

The paging message is transmitted using the DL-SCH, and whether a paging message exists on the DL-SCH can be known through the transmission of a PDCCH masked with a Paging Radio Network Temporary Identity (P-RNTI). A procedure of updating system information by the terminal using such a paging message will be described with reference to FIG. 2.

2 is a diagram illustrating a procedure of recognizing system information update through a paging message according to the prior art.

Referring to FIG. 2, the terminal receives a paging message in step 200. In operation 210, the terminal determines whether a value of the systemInfoModification field included in the paging message is 1. If the value of the system information change field is 1, the terminal recognizes that the system information will be changed in the next modification period in step 220 and ends. On the other hand, if the value of the system information modification field (systemInfoModification field) is not 1 in step 210, the terminal knows that the system information (system information) does not change in the next modification period in step 230 and ends.

A procedure of changing system information in the terminal described with reference to FIGS. 1 and 2 is as follows.

When the system information is changed, the cell informs the terminals that the system information is changed during the next modification period through a paging message during the modification period. Then, as soon as the terminal receives the system information change notification, the next modification period (modification period) begins, the new system information is obtained immediately. In addition, the UE can know whether the system information stored in the current modification period is valid through the system information value tag (systemInfoValueTag) of SIB1. Accordingly, the UEs attempt to find at least modificationPeriodCoeff times of system information in the paging message during the modification period, and after the modification period, the system information stored through the system information value tag (systemInfoValueTag) of SIB1. Is checked for validity.

However, in LTE-A (Long Term Evolution-Advanced), carrier aggregation, which is one of bandwidth extension technologies, is defined, and a plurality of component carriers exist. When using the procedure defined in the existing LTE standard to find out the change of the system information in a number of CCs, it is necessary to decode the paging message and SIB1 of all CCs supported to the LTE-A terminal. Therefore, the number of blind decoding increases compared to the LTE standard.

In addition, when there is a component carrier that is not monitored as defined in the PDCCH monitoring set, it should be noted that the system information of the component carrier that is not monitored changes. In order to know that the system information of the non-monitoring component carrier changes, the UE detects system information change of another component carrier through the CI (Carrier Indication) field indicating the system information and component carrier of the corresponding component carrier currently monitoring the PDCCH. Should be. Therefore, since the UE must decode DCI format 1C or 1A of different sizes, there is a problem of increasing the number of blind decoding of the LTE-A terminal. In addition, when the system information of the component carrier monitoring the PDCCH is changed, the LTE terminal connected to the component carrier should also know the system information change. In this case, the LTE-A system informs the terminal that the system information of the corresponding CC has been changed to the existing Rel. 8 DCI format 1C or 1A according to the LTE standard and DCI format 1C or 1A to which the CI field for the LTE-A terminal is added must be transmitted separately. As a result, scheduling becomes complicated and resources are wasted. Given these issues, other new procedures and methods are needed to confirm system changes.

In order to solve the above problems, the present invention proposes a system information update method and a communication system performing the same.

The system information update method according to an embodiment of the present invention for achieving the above object comprises the steps of the cell transmitting a system information update message for the component carrier with the updated system information to the terminal through the downlink anchor carrier, The terminal checks the component carrier in the component carrier system information update field included in the system information update message, and the terminal receives updated system information of the identified component carrier transmitted from the cell in a change cycle. Process.

In addition, in the system information update method according to an embodiment of the present invention, the system information update message may be any one of a paging message and a system information block.

In the system information update method according to an embodiment of the present invention, the terminal identifies the component carrier to which the system information is updated through the component carrier system information update field included in the paging message, and updates the component carrier in the next change period. And receiving the system information.

In addition, in the system information update method according to an embodiment of the present invention, the terminal identifies the component carrier to update the system information through the component carrier system information update field included in the system information block, and updates the component carrier in the current change cycle. It characterized in that it comprises a process of receiving the system information.

Next, in the system information update method according to an embodiment of the present invention, the component carrier system information update field is defined as a bit corresponding to the number of component carriers included in the set of downlink carriers.

In the system information update method according to an embodiment of the present invention, the component carrier system information update field is defined as the number of ceiling bits by applying a binary log to the number of component carriers included in a set of downlink carriers. It is characterized by.

In order to achieve the above object, a system information update communication system according to an embodiment of the present invention transmits a system information update message for a component carrier whose system information is updated through a downlink anchor carrier, and updates the component carrier A cell for transmitting system information, and a terminal for identifying the component carrier in the component carrier system information update field included in the system information update message received from the cell, and updating the system information of the component carrier in a change cycle. do.

According to the present invention, when carrier aggregation technology is applied in the LTE-A system, the LTE-A terminal may recognize whether system information is updated for each component carrier. In addition, the LTE-A terminal may update the system information for each CC.

In the Long Term Evolution Advanced (LTE-A) system of the 3rd Generation Partnership Project (3GPP), a bandwidth extension technology called bandwidth extension or carrier aggregation is a technology that increases data transmission by increasing bandwidth. Through this technique, the amount of data transmitted through one band can be increased by an extended bandwidth. Each of the bandwidths extended through the bandwidth extension technique is called a component carrier, and in an LTE system, a terminal is defined to have one component carrier. Here, the component carriers may be continuous or discontinuous in frequency.

Carrier that can be applied in the LTE-A system may be defined as follows.

-Backward compatible carrier: Carrier that LTE terminal can access

-Non-backward compatible carrier: Carrier that can be connected to LTE-A (Long Term Evolution Advenced) terminal only

-Extension carrier: Carrier that cannot be operated singly and can only be used for data transmission

DL CC set (Down Link Component Carrier set): a set of downlink carriers

UL CC set (Up Link Component Carrier set): a set of uplink carriers

-Carrier Indicator Field (CIF): When it is difficult to send PDCCH (Physical Down-link Control Channel) on a specific CC, another CC transmits a PDCCH, and the corresponding PDCCH is a PDSCH of another CC A field indicating that a shared channel (PUS) or a physical uplink shared channel (PUSCH) is indicated. It is determined to add 3 bits to the Down-link Control Information (DCI) format to indicate another component carrier.

-PDCCH monitoring set: A set of carriers of some of the carriers included in the DL CC set, which defines that the UE decodes the PDCCH only in this set.

In addition to the PDCCH monitoring set, a downlink anchor component carrier (hereinafter referred to as a DL anchor carrier) or an uplink anchor component carrier (UL anchor CC) may be included in addition to the PDCCH monitoring set. have.

In the present invention, in a LTE-A system to which carrier aggregation is applied among bandwidth extension technologies, a cell transmits a system information update message for indicating a component carrier with updated system information to a downlink anchor component (DL anchor carrier). Send to the terminal through. In this case, the system information update message may be a paging message or a system information block, and each paging message or system information block includes a component carrier system information update field.

Then, the terminal checks the component carrier updated with the system information through the received system information update message, and receives the system information of the component carrier confirmed in the change cycle from the cell.

In other words, the UE may determine whether to change the system information of the CC through the field indicating the update of the system information of the other CCs included in the paging message transmitted through the downlink anchor carrier. The UE may receive updated system information of the corresponding CC from the cell in the next change period. Alternatively, the terminal may determine whether system information of another component carrier is changed through a field indicating whether system information of a component carrier included in SIB1 of the downlink anchor carrier is updated. In addition, the UE may receive updated system information of the corresponding CC from the cell in the current change period.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

Before describing the update process of the system information, a method of receiving a DL CC set, a PDCCH monitoring set, and a DL anchor carrier consisting of a downlink component carrier will be described.

DL CC set is a set of downlink carriers defined according to a cell.

The PDCCH monitoring set is a set of some of the carriers included in the DL CC set. The terminal can decode the PDCCH only in the PDCCH monitoring set, and the PDCCH monitoring set is defined for each terminal.

The DL anchor carrier refers to one component carrier of a component carrier included in a DL CC set. The terminal may first decode a signal transmitted through the DL anchor carrier, and the DL anchor carrier is defined for each terminal.

The correlation between the DL CC set and the PDCCH monitoring set can be described as follows.

The PDCCH monitoring set is included in the DL CC set as in Equation 1.

DL CC set ⊇ PDCCH monitoring set

For example, it is assumed that DL CC set = {1, 2, 3, 4, 5}, and each number means a component carrier having a 20 MHz bandwidth. The cell then sets the maximum number of carriers that can be allocated among the carriers included in the DL CC set according to the capability of the terminal. The cell sets PDCCH monitoring set = {1, 3, 4} to decode the PDCCH to a specific UE only on a specific CC. Here, although it is assumed that the bands of all CCs included in the DL CC set are the same, the band may be applied to a case where the CCs are different for each CC.

In the above, the DL CC set and the PDCCH monitoring set have been described. Note that the DL CC set and the PDCCH monitoring set, which refer to the CC set as mentioned herein, may be different in the process of preparing a standard. Next, a description will be given of a procedure in which the DL CC set and the PDCCH monitoring set, which are CC sets, are known to the UE.

3 is a diagram illustrating a procedure in which component carrier sets are known to a terminal according to the present invention.

Referring to FIG. 3, the terminal searches for an initial cell in step 300. When the cell search is completed, the terminal receives system information including a DL CC set which is a set of downlink carriers defined for each cell in step 310. Next, the terminal performs random access in step 320. In step 330, the UE performs an RRC connection set up (RRC). In this case, the UE may receive a PDCCH monitoring set and a DL anchor CC defined according to the UE through the RRC connection set up.

In the present invention, the terminal may update the system information for each component carrier through a component carrier system information update field defined in a paging message or a system information block that is a system information update message received through a DL anchor carrier. A method of updating system information through the component carrier system information update field defined in the paging message or the system information block will be described with reference to FIGS. 4 to 7.

4 is a diagram illustrating a component carrier system information update field defined in a paging message according to the present invention. 5 is a diagram illustrating a system information update procedure of CCs using a page message according to the present invention.

Referring to FIG. 4, a paging message field newly defined according to the present invention includes a paging message field 400 and a component carrier system information update field 410. Here, the component carrier system information update field 410 is a field for indicating a component carrier to which system information should be updated.

Various methods may be used to define the component carrier system information update field 410, but it will be described here with two methods.

First, the CC information field 410 is defined as a bit corresponding to the number of CCs defined in the DL CC set. For example, if the number of CCs in the DL CC set is 5, the CC system information update field 410 is set to 00000, which is 5 bits. In this case, each bit represents the order of the component carriers to which the system information is updated in the next modification period. For example, if the system information of the second CC in the DL CC set is updated in the next modification period, the CC information field 410 may be defined as 01000. In addition, when a plurality of CC information is updated, for example, when the system information of the third CC and the fourth CC is updated in the next modification period, the CC system information update field 410 is 00110 may be defined. In this case, the modification period may be set equal to each component carrier or may be set differently for each component carrier.

Secondly, the component carrier system information update field 410 is defined as the number of ceilings applied by applying a binary log to the number of component carriers of a DL CC set. For example, if the number of component carriers defined in the DL CC set is five, the component carrier system information update field 410 is defined as 000 which is 3 bits using 2.xxx, which is a value of log ₂ 5. In this case, in the CC information field 410, the first CC is set as 000, the second CC is 001, the third CC is 010, the fourth CC is 011, and the fifth CC is 100. The component carrier system information update field 410 defined in this manner is preferably used when one component carrier system information is updated in the next modification period.

Next, a procedure of updating system information for each component carrier using a page message will be described with reference to FIG. 5.

Referring to FIG. 5, the terminal receives a paging message through a DL anchor carrier defined according to the terminal in step 500. In step 510, the terminal determines whether the systemInfoModification field value included in the paging message is 1.

If the value of the system information change field is 1 in step 510, the UE recognizes that the system information of the DL anchor carrier is changed in the next modification period in step 520. Alternatively, if the system information change field value is not 1 in step 510, the UE recognizes that the system information of the DL anchor carrier is not changed in the next modification period (step 530).

After checking whether the DL anchor carrier has updated system information, the UE checks the component carrier whose system information is to be updated in the next modification period from the component carrier system information update field 410 described with reference to FIG. 4. As illustrated in the detailed description of FIG. 4, when the number of component carriers of the DL CC set is five, if 01000 is written in the component carrier system information update field 410, which is a 5-bit bitfield, the UE sets the DL CC set. It may be determined that system information of the second component carrier of is updated in a next modification period. In step 550, the terminal confirming the CC of which the system information is to be updated receives the updated system information of the CC in a next modification period.

Up to now, a method of updating the system information of the CC using the CC information field included in the paging message has been described with reference to FIGS. 4 to 5. Next, a method of updating system information of an element carrier using a system information block will be described with reference to FIGS. 6 to 7.

6 is a diagram illustrating a system information update field of component carriers included in a system information block according to the present invention. 7 is a diagram illustrating a procedure of updating system information of component carriers using a system information block according to the present invention.

First, referring to FIG. 6, a SIB1 field and a component carrier system information update field 610 are newly defined as information fields of a newly defined SIB1 among system information blocks according to the present invention.

Various methods may be used as the method of defining the component carrier system information update field 610, but it will be described here with two methods.

First, the component carrier system information update field 610 is defined as bits corresponding to the number of component carriers included in the DL CC set. For example, if the number of component carriers of the DL CC set is three, the component carrier system information update field 610 is set to 000, which is three bits. In this case, each bit represents the order of the component carriers to which the system information is updated in the current modification period. For example, if the system information is updated in the current modification period of the third component carrier in the DL CC set, the component carrier system information update field 610 may be defined as 001. In addition, when a plurality of CC system information is updated, for example, if the system information of the first CC and the third CC is updated in the current modification period, the CC system information update field 610 May be defined as 101. In this case, the modification period may be set equal to each component carrier or may be set differently for each component carrier.

Secondly, the component carrier system information update field 610 is defined as the number of ceiling bits by applying a binary log to the number of carriers included in the DL CC set. For example, if the number of component carriers defined in the DL CC set is five, the component carrier system information update field 610 is defined as 000, which is a three-bit bit field using 2.xxx, which is a value of log ₂ 5. In this case, in the CC information field 610, the first CC is set as 000, the second CC is 001, the third CC is 010, the fourth CC is 011, and the fifth CC is 100. The component carrier system information update field 610 defined in this manner is preferably used when one component carrier system information is updated in a current modification period.

Next, a procedure of updating the system information of the CC using the system information block described with reference to FIG. 6 will be described with reference to FIG. 7.

Referring to FIG. 7, the terminal receives SIB1 through a DL anchor carrier defined according to the terminal in step 700. Upon receiving the SIB1, the UE determines whether the value of the system information value tag systemInfoValueTag is the same as the previous value in step 710. If the value of the system information value tag (systemInfoValueTag) is different from the previous value in step 710, the UE recognizes that the system information of the DL anchor carrier is changed in the current modification period (720). Receive and update all system information from the cell. However, if the value of the system information value tag (systemInfoValueTag) is the same as the previous value in step 710, the UE recognizes that the system information of the DL anchor carrier does not change in the current modification period in step 730. do.

Next, in step 740, the terminal identifies the CC from which the CC information is updated in the current modification period from the CC information field 610 as shown in FIG. 6. As illustrated in the detailed description of FIG. 6, if the number of component carriers of the DL CC set is three, and 010 is defined in the component carrier system information update field 610 which is a 3-bit bitfield, the UE is defined in the DL CC set. It can be seen that system information of the second CC is updated in the current modification period. After identifying the CC to update the system information, the UE updates and terminates all system information of the CC in step 750.

In the above, the method of updating the system information of the component carrier using the value of the component carrier system information update field included in the paging message or system information block received through the DL anchor carrier has been described. Next, a schematic configuration of a terminal for updating system information of a component carrier and a schematic configuration of a cell transmitting a DL anchor carrier will be described with reference to FIGS. 8 to 9.

8 is a view schematically showing the configuration of a terminal according to the present invention.

The UE may be configured with one receiver structure or several components depending on whether the bands of the CCs constituting the DL CC set are continuous or discontinuous. Here, two CCs constituting the DL CC set, and in the case of a non-contiguous band, a UE configured with two receivers for each CC will be described.

Referring to FIG. 8, the terminal may include a receiver 810 for a DL anchor carrier, a controller 820, and a receiver 830 for a specific component carrier.

First, a signal received through the first receiver 811 of the receiver 810 for the DL anchor carrier is SIB via the first PDCCH decoder 815 and the first PDSCH decoder 817 via the first demultiplexer 813. To be decoded. The decoded SIB is stored in the first system information store 819. The controller 820 may use a component carrier system information update field for updating system information of a component carrier among signals decoded by the first PDCCH decoder 815 and the first PDSCH decoder 817, and then the controller 820 may be configured to update a specific component carrier. Determine whether system information is updated.

If the system information of the specific component carrier is changed, the updated system information of the component carrier is received through the receiver 830 for the component carrier. In more detail, the signal received in the change period through the second receiver 831 for the component carrier is separated through the second demultiplexer 833 to separate the second PDCCH receiver 835 and the second PDSCH receiver 837. Receive the SIB through the) and stores in the second system information storage (839).

A method of updating system information of a CC through a paging message in a terminal having such a configuration will be described below.

The signal received at the first receiver 810 is separated through the first demultiplexer 813, decoded into SIB by the first PDCCH decoder 815 and the first PDSCH decoder 817, and the first system information store. (819). The controller 820 identifies the component carrier whose system information is changed in the next modification period by using the paging message decoded by the first PDCCH decoder 815 and the eleventh PDSCH decoder 817.

If there is a component carrier whose system information is changed, the system information is updated with a signal received through the second receiver 831 for receiving the component carrier. In more detail, the signal received in the next modification period through the second receiver 831 is separated through the second demultiplexer 833. The system information storage 839 stores system information decoded through the second PDCCH decoder 835 and the second PDSCH decoder 837.

Next, a method of updating system information using the SIB1 in the terminal will be described. The signal received at the first receiver 811 is separated through the first demultiplexer 813 and decoded into the SIB through the first PDCCH decoder 815 and the first PDSCH decoder 817. The decoded SIB is then stored in the system information store 819. Then, the controller 820 checks the component carrier system information update field included in SIB1 of the SIB, and identifies a specific component carrier whose system information is changed in a current modification period.

If there is a component carrier whose system information is changed, the updated system information is received using the component carrier receiver 830. In more detail, the signal received in the current modification period through the second receiver 831 for the component carrier is separated through the second demultiplexer 833, and the second PDCCH decoder 835 and the second PDCCH decoder 835. 2 PDSCH decoder 837 decodes into SIB. The decoded SIB is stored in the system information store 839.

Next, a structure of a cell for transmitting the CC of which the system information is updated will be described with reference to FIG. 9.

9 illustrates a cell device structure according to the present invention.

Here, the transmitter of the cell may be configured as one or several according to whether the bands of the component carriers are continuous or discontinuous in the DL CC set. Here, the cell transmitter will be described based on a case in which two component carriers exist and are configured for each component carrier assuming a situation where the bands are discontinuous.

Referring to FIG. 9, a cell includes a scheduler 900, a controller 910, a transmitter 920 for transmitting a DL anchor carrier, and a transmitter 930 for a component carrier.

In this case, the cell scheduler 900 and the controller 910 generate a system information update message for the CC of which the system information is updated. The generated system information update message is multiplexed through the first PDCCH generator 921, the first PDSCH generator 922, and the first multiplexer 923 of the transmitter 920 for the DL anchor carrier. Transmitted to the terminal. The system information update message may be a paging message or a system information block, and each paging message or system information block includes a component carrier system information update field for indicating a component carrier on which system information is to be updated.

The controller 910 performs a second PDCCH generator 931, a second PDSCH generator 932, and a second multiplexer 933 of the transmitter 930 for a specific CC according to a system information update message transmitted to the UE. The system information of the multiplexed CCs is transmitted to the UE through the second transmitter 934.

A method of transmitting a paging message, which is a system information update message, in each configuration of a cell is as follows. The scheduler 900 and the controller 910 transmit the multiplexed paging message through the first PDCCH generator 921, the first PDSCH generator 922, and the first multiplexer 923 of the transmitter 920 for the DL anchor carrier. Transmit to the terminal through the first transmitter 924. At this point, the paging message includes a component carrier system information update field for indicating a component carrier whose system information is updated.

Next, the controller 910 uses the second PDCCH generator 931, the second PDSCH generator 932, and the second multiplexer 933 of the transmitter 930 for a specific CC according to the paging message transmitted to the UE. System information of the multiplexed CC is transmitted to the UE through the second transmitter 934.

The method of transmitting the system information update message SIB1 in each configuration of the cell is as follows. The scheduler 900 and the controller 910 remove the multiplexed SIB1 through the first PDCCH generator 921, the first PDSCH generator 922, and the first multiplexer 923 of the transmitter 920 for the DL anchor carrier. 1 is transmitted to the terminal through the transmitter 924. At this time, SIB1 includes a component carrier system information update field for indicating a component carrier whose system information is updated.

The controller 910 is multiplexed through the second PDCCH generator 931, the second PDSCH generator 932, and the second multiplexer 933 of the transmitter 930 for a specific CC according to SIB1 transmitted to the UE. The system information of the CC is transmitted to the UE through the second transmitter 934.

In the above description, embodiments of the present invention disclosed in the specification and drawings are merely illustrative of the technical contents of the present invention, and specific examples are provided for the understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

1 is a diagram illustrating an update procedure of system information using a system information block according to the related art.

2 is a diagram illustrating a procedure of recognizing system information update through a paging message according to the prior art.

3 is a diagram illustrating a procedure in which component carrier sets are known to a terminal according to the present invention.

4 is a diagram illustrating a component carrier system information update field defined in a paging message according to the present invention.

5 is a diagram illustrating a system information update procedure of CCs using a page message according to the present invention.

6 is a diagram illustrating a system information update field of component carriers included in a system information block according to the present invention.

7 is a diagram illustrating a procedure of updating system information of component carriers using a system information block according to the present invention.

8 is a view schematically showing the configuration of a terminal according to the present invention.

9 illustrates a cell device structure according to the present invention.

Claims (12)

A system information update method in a communication system to which a bandwidth extension technology extended to at least one component carrier is applied, The cell transmits a system information update message for a component carrier with updated system information to the terminal through a downlink anchor carrier, Checking, by the terminal, the component carrier in the component carrier system information update field included in the system information update message; And the terminal receiving the updated system information of the confirmed CC from the cell in a change cycle. The system information update message of claim 1, wherein the system information update message is System information updating method, characterized in that the paging message or one of the system information block. The method of claim 2, The terminal may include identifying a component carrier to be updated with system information through the component carrier system information update field included in the paging message, and receiving updated system information of the component carrier in a next change period. How to update system information. The method of claim 2, The terminal may include identifying a component carrier to update system information through the component carrier system information update field included in the system information block, and receiving updated system information of the component carrier in a current change period. How to update system information. The method of claim 1, wherein the component carrier system information update field is System information updating method, characterized in that the bit corresponding to the number of component carriers included in the set of downlink carriers. The method of claim 1, wherein the component carrier system information update field is And applying a binary log to the number of component carriers included in the set of downlink carriers, the system information updating method being defined as the number of ceiling bits. A cell for transmitting a system information update message for a component carrier whose system information is updated through a downlink anchor carrier, and for transmitting the updated system information of the component carrier; And checking the CC in the CC information field included in the system information update message received from the cell, and updating the system information of the CC at a change cycle. Communication system. The system information update message of claim 7, wherein the system information update message is And a paging message or a system information block. The method of claim 8, wherein the terminal And a component carrier to update system information through the component carrier system information update field included in the paging message, and receive updated system information of the component carrier in a next change period. The method of claim 8, wherein the terminal The system information update communication system characterized in that the component carrier to update the system information through the component carrier system information update field included in the system information block, and receives the updated system information of the component carrier in the current change period. . The method of claim 7, wherein the component carrier system information update field is And a bit corresponding to the number of component carriers included in the downlink carrier set. The method of claim 7, wherein the component carrier system information update field is And a binary log applied to the number of component carriers included in the downlink carrier set to define the number of ceiling bits.

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