KR20190016811A - Method and apparatus for system information change in wireless communication system - Google Patents

Abstract

This disclosure relates to a method and apparatus for changing system information in a wireless communication system. A method for receiving system information in a wireless communication system according to an embodiment of the present disclosure includes receiving a first system information block (SIB) including overall system information change indication information and specific system information change indication information in a first cycle ; Attempting to receive all of the MIB (Master Information Block), the first SIB, and the one or more second SIBs in the second period when the value of the total system information change instruction information is changed; Attempting to receive the first SIB or the at least one second SIB associated with the specific system information change indication information in the second period when the value of the specific system information change indication information is changed; And stopping monitoring of the one or more second SIBs in a third cycle.

Description

TECHNICAL FIELD The present invention relates to a method and apparatus for changing system information in a wireless communication system,

The present disclosure is directed to a wireless communication system, and more particularly, to a method and apparatus for changing system information.

The International Telecommunication Union (ITU) has been developing IMT (International Mobile Telecommunication) frameworks and standards, and is currently under discussion for 5G (5G) communication through a program called "IMT for 2020 and beyond" .

In order to meet the requirements of "IMT for 2020 and beyond ", the 3rd Generation Partnership Project (3GPP) NR (New Radio) system, considering various scenarios, service requirements and potential system compatibility, It is being discussed in support of diverse numerology of resource unit standards. In NR system, the amount of system information is expected to increase in order to support various neurorogies. However, a method for requesting and monitoring the terminal for changing or updating the system information, consuming radio resources caused by the signaling of the base station, and reducing energy consumption in the terminal and the base station has not been specifically defined yet.

It is a technical object of the present disclosure to provide a method and apparatus for changing or updating system information in a wireless communication system.

It is a further technical object of the present disclosure to provide a method and apparatus for minimizing signaling of a base station and requesting and monitoring system information of a terminal for changing or updating system information in a wireless communication system.

The technical objects to be achieved by the present disclosure are not limited to the above-mentioned technical subjects, and other technical subjects which are not mentioned are to be clearly understood from the following description to those skilled in the art It will be possible.

A method of receiving system information in a wireless communication system in accordance with an aspect of the present disclosure includes receiving a first system information block (SIB) including overall system information change indication information and specific system information change indication information in a first period step; Attempting to receive all of the MIB (Master Information Block), the first SIB, and the one or more second SIBs in the second period when the value of the total system information change instruction information is changed; Attempting to receive the first SIB or the at least one second SIB associated with the specific system information change indication information in the second period when the value of the specific system information change indication information is changed; And stopping monitoring of the one or more second SIBs in a third cycle.

The features briefly summarized above for this disclosure are only exemplary aspects of the detailed description of the disclosure which follow, and are not intended to limit the scope of the disclosure.

According to the present disclosure, a method and apparatus for changing or updating system information in a wireless communication system can be provided.

According to the present disclosure, a system and method for requesting and monitoring system information of a terminal for changing or updating system information in a wireless communication system, and a method and apparatus for minimizing signaling of a base station can be provided.

The effects obtainable from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below will be.

1 is a diagram illustrating a wireless communication system to which the present disclosure is applied.
2 is a diagram showing an embodiment of a system information changing operation according to the present disclosure.
3 is a diagram illustrating a further embodiment of a system information change operation according to the present disclosure;
4 is a diagram illustrating a further embodiment of a system information change operation according to the present disclosure;
5 is a diagram illustrating a further embodiment of a system information change operation according to the present disclosure.
6 is a flowchart for explaining a system information changing operation according to the present disclosure.
7 is a diagram showing a configuration of a base station apparatus and a terminal apparatus according to the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, which will be easily understood by those skilled in the art. However, the present disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear. Parts not related to the description of the present disclosure in the drawings are omitted, and like parts are denoted by similar reference numerals.

In the present disclosure, when an element is referred to as being "connected", "coupled", or "connected" to another element, it is understood that not only a direct connection relationship but also an indirect connection relationship May also be included. Also, when an element is referred to as " comprising "or" having "another element, it is meant to include not only excluding another element but also another element .

In the present disclosure, the terms first, second, etc. are used only for the purpose of distinguishing one element from another, and do not limit the order or importance of elements, etc. unless specifically stated otherwise. Thus, within the scope of this disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly a second component in one embodiment may be referred to as a first component .

In the present disclosure, the components that are distinguished from each other are intended to clearly illustrate each feature and do not necessarily mean that components are separate. That is, a plurality of components may be integrated into one hardware or software unit, or a single component may be distributed into a plurality of hardware or software units. Thus, unless otherwise noted, such integrated or distributed embodiments are also included within the scope of this disclosure.

In the present disclosure, the components described in the various embodiments are not necessarily essential components, and some may be optional components. Thus, embodiments consisting of a subset of the components described in one embodiment are also included within the scope of the present disclosure. Also, embodiments that include other elements in addition to the elements described in the various embodiments are also included in the scope of the present disclosure.

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal connected to the network.

That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A 'base station (BS)' may be replaced by a term such as a fixed station, a Node B, an eNode B (eNB), an access point (AP) In addition, 'terminal' may be replaced with terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS) .

1 is a diagram illustrating a wireless communication system to which the present disclosure is applied.

The network structure shown in FIG. 1 may be a network structure of an Evolved-Universal Mobile Telecommunications System (E-UMTS). The E-UMTS system includes a LTE (Long Term Evolution), an LTE-A (advanced), an LTE-A pro system and an evolved-LTE system, or a 5G mobile communication network, a 5G ), And the like.

Referring to FIG. 1, a base station (BS) and a user equipment (UE) 12 in a wireless communication system 10 can transmit and receive data wirelessly. Also, the wireless communication system 10 may support D2D (Device to Device) communication. D2D communication in a wireless communication system will be described later.

In the wireless communication system 10, the base station 11 can provide a communication service through a specific frequency band to terminals existing within the coverage of the base station. The coverage served by the base station may also be expressed in terms of a site. A site may include a plurality of areas 15a, 15b, 15c, which may be referred to as sectors. Each of the sectors included in the site can be identified based on different identifiers. Each of the sectors 15a, 15b, and 15c can be interpreted as a partial area covered by the base station 11.

The base station 11 generally refers to a station that communicates with the terminal 12 and includes an evolved NodeB (eNodeB), a gNB (g-NodeB or 5G-NodeB), a base transceiver system (BTS) A femto base station (Femto eNodeB), a home base station (HeNodeB), a relay, a remote radio head (RRH), and the like.

The terminal 12 may be fixed or mobile and may be a mobile station, a mobile terminal, a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA) , A wireless modem, a handheld device, a connected car, a wearable device, an Internet of Things device, and the like.

The base station 11 may also be referred to as various terms such as megacell, macrocell, microcell, picocell, femtocell, etc. depending on the size of the coverage provided by the base station and / . A cell may be used in terms of a frequency band provided by the base station, coverage of the base station, a beam embodied by the antenna of the base station, or a term indicating the base station. Also, when one terminal is connected to two or more base stations at the same time, such as dual connectivity or multi connectivity, the terminals may be called different terms depending on the role of each base station as follows. For example, a base station capable of directly controlling signaling for radio resource control for the MS and controlling mobility and radio connection such as handover is a master eNodeB, and provides additional radio resources to the MS A base station that can control some of the radio resources in some independent manner and some can proceed through the primary base station may be referred to as secondary eNodeB.

Downlink refers to communication or communication path from the base station 11 to the terminal 12 and uplink refers to communication from the terminal 12 to the base station 11 Communication path ". In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12. In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11.

On the other hand, there is no limitation in the multiple access technique applied to the wireless communication system 10. [ For example, a CDMA (Code Division Multiple Access), a TDMA (Time Division Multiple Access), an FDMA (Frequency Division Multiple Access), an OFDMA (Orthogonal Frequency Division Multiple Access), an SC- , OFDM-TDMA, OFDM-CDMA, frequency hopping (FH) -CDMA, and FH-OFDMA. In the uplink transmission and the downlink transmission, a time division duplex (TDD) scheme, a frequency division duplex scheme (FDD) scheme using different frequencies, And a half-FDD scheme in which link transmission and downlink transmission are performed using different times.

The abbreviations used in this disclosure are defined as follows.

- RRC: Radio Resource Control

- RAN: Radio Access Network

- SFN: System Frame Number

- SI: System information

- RMSI: Remaining Minimum System Information

- TRS: Tracking Reference Signal

- gNB: g-NodeB (name of base station of NR system, called gNB to distinguish it from LTE's eNB)

- NR-PDCCH: NR-Physical Dedicated Control Channel

- RNTI: Radio Network Temporary Identifier

- DCI: Downlink Control Information

- eMBB: evolved Mobile BroadBand

- URLLC: Ultra Reliability Low Latency Communication

- mMTC: massive Machine Type Communication

- HSS: Home Subscriber Server

- s-TMSI: System Architecture Evolution (SAE) -Temporary Mobile Subscriber Identity

- IMSI: International Mobile Subscriber Identity

Different types of services required for the next generation mobile communication system, such as realistic contents, mobile holographic displays, and smart home services, can be roughly classified into three types of services, eMBB, URLLC, and mMTC. The requirements required to support the above three service types must meet different criteria in the same requirement item. For example, in the case of an eMBB service, the requirement items for latency may have different reliability for each channel in which data conforming to various types and purposes are transmitted. For example, there may be various criteria such as 1%, 0.01%, or 0.001% error rate for data with different QoS. The eMBB service has a requirement criterion that the delay time generated in the unidirectional communication between the layer 2 in the terminal and the layer 2 in the base station should not exceed 4 ms based on the above reliability, In the same environment should not exceed 0.5 ms.

In order to satisfy the different requirement criteria, not only a unit of radio resources defined as a time / frequency / space which is the basic unit of a physical channel, but also signaling between a terminal and a network in order to support radio resource control and mobility of the terminal It can have a big impact. Therefore, the requirement criterion is defined such as 5 ms based on the situation that 0.001% error occurs with respect to the delay time and reliability in the control plane (CP) communication.

In the existing fourth generation wireless communication system such as LTE, RRC connected mode (RRC connected mode) and RRC idle mode are defined. The RRC connection mode can be defined as a state of maintaining a wireless connection between a terminal and a base station in order to support voice call and wireless data service in real time. The RRC idle mode is a state in which a PLMN (Public Land Mobile Network) and a cell are selected and camped on, including a moment when the initial power-on of the UE is completed, or a state in which the UE is in a RRC connection mode A state in which it is determined that the RRC connection mode can not be maintained after the RRC connection is released or it is determined that the network signal can not be found and the mobile terminal is out of the service area.

Next, the TA (Tracking Area) will be described before describing the RRC deactivation mode (RRC inactive mode).

If the terminal does not receive the wireless communication service in the RRC IDLE mode but requests a wireless communication service from the other terminal or a server in the network to the corresponding terminal or requests a data transmission from a user or an application program using the terminal In this case, it should be possible to start the wireless communication service immediately. Accordingly, the network transmits a paging signal to establish an RRC connection with the MS in the above situation. However, since the UE in the RRC IDLE mode can not transmit any signal to the Node B, basically, the network can not know to which base station the UE has moved when the UE moves. Therefore, the apparatus for transmitting paging to the terminal in the network can only request to all the base stations in the network to transmit the paging signal for the terminal and to transmit the paging signal by radio. This consumes very large network signaling loads and radio resources. Furthermore, as the number of terminals increases, the signaling load will increase exponentially.

Therefore, in order to solve the above problems, the concept of TA (Tracking Area) is introduced. The TA transmits the paging signal only through the cell or the base station in the TA. In order to do this, the terminal must inform the network of the TA information where the corresponding terminal is located so that the paging signal transmitted to the terminal can be always transmitted. Therefore, it is advantageous to reduce the network signaling load and radio resource consumption caused by the paging transmission. However, there is a disadvantage that signaling between the additional terminal and the network is required every time the terminal moves to another TA area.

Specifically, the TA sets one or more cells or base stations to one TA, and cells or base stations included in the same TA are all assigned the same TA ID value. The TA setting and the ID allocation are managed by a device that transmits paging to a terminal in the network. The device may be referred to as an MME (Mobility Management Entity) or an AMF (Access Management Function). Each base station transmits TA ID information set by the MME by including it in system information (SI). Therefore, when the RRC IDLE mode UE moves and changes the serving cell, that is, camped on to the cell selected through the cell selection procedure, the UE checks the TA ID in the SI transmitted by the serving cell, It can be determined whether or not the area is the same as TA.

A feature of the RRC deactivation mode is that it uses RNA (RAN-based Notification Area). RNA has the same purpose as TA. That is, the RNA is defined as a range for transmitting a paging signal for one terminal. The definition method of RNA is also similar to TA. That is, one or more cells or base stations. The difference is that the RNA is defined to support the mobility of the terminal in the RRC inactive mode and is distinguished from the TA for supporting the mobility of the terminal in the RRC idle mode.

Specifically, the RRC inactive mode has the following characteristics.

- The connection between the Core Network (CN) and the NR RAN is established for the UE. The connection between this CN and the NR RAN includes both the connection on the control plane CP and the connection on the user plane UP.

- The Access Stratum (AS) context of the UE is stored in at least one base station (gNB) and the UE. The AS corresponds to a functional layer between a wireless network and a terminal, and handles data transfer and radio resource management through a wireless connection.

- Paging is initiated by the NR RAN.

- RNA is operated by NR RAN.

- NR The RAN knows the RNA to which the terminal belongs.

- In case of changing from the RRC connected mode to the RRC inactive mode by the RRC inactivation procedure of the base station, all the component carriers (CCs) set and activated for the UE except for the primary cell (PCell) May transition to an inactive state, or all of the configured element carriers may be released.

Here, a cell or a base station included in the RNA may be provided in a list form and included in system information SI to be provided to the UE in a broadcast format, or may be reconfigured in an RRC connected mode when the RRC inactive mode UE is in RRC connected mode. Message to the terminal. At this time, the information included in the list may be a cell ID (Cell ID) defined in the NR system. For example, the RNA information in the list form may include only one or more cell identifier information or base station identifier information in the RNA including the cell in the base station. Or one or more cell identifier information or base station identifier information mapped to the first RNA identifier information, one or more cell identifier information or base station identifier information mapped to the second RNA identifier information, and so on. The RNA ID value is included in system information (SI) and broadcasted, and the terminal can confirm the RNA to which the terminal belongs by checking the ID value.

On the other hand, system information messages are transmitted within a system information window (hereinafter referred to as SI-window), which is a time domain window, and the SI-window is periodically configured. In the SI-window, the system information message can be transmitted by a base station in a dynamic resource allocation scheme via a PDCCH. Each system information message is transmitted in one SI-window and does not overlap with the SI-window associated with another system information message in the time domain. That is, only the system information corresponding to the SI-window is transmitted to the system information transmitted through one SI-window. The length of the SI-window can be equally applied to all SIs, and the length of the SI-window is configured by the base station. The length information of the SI-window can be transmitted through the MIB or RMSI and can be SIB1 of the RMSI. If the SIB contains information supporting the mMTC service, the system information may be provided through the base station with a wide service coverage due to the characteristics of the mMTC service. Dynamic resource allocation of a more flexible system information message may be required for this. As an example, the length of the SI-window may need to be minimized to minimize power consumption. Therefore, the SI-window length for a specific SIB can be separately transmitted through the MIB or RMSI, and the SIB to which the separate SI-window length is applied can be defined as one or a plurality of SIBs.

In addition, the system information change is performed only in certain system frames. We use the concept of "modification period" to define this. The system information may be transmitted several times within one change cycle based on the scheduling information for each system information. The boundary of the change period is defined by a system frame number (SFN) value, and may be, for example, m (m is a natural number). That is, the change period boundary is defined as a system frame in which the value of SFN mod m becomes zero. Therefore, the length of the modification period may be defined as m. The value m may be defined as a product of a parameter value n transmitted through an MIB or RMSI and a defaultPagingCycle value. The parameter value n may be one of 2, 4, 8, and 16, and the RMSI to which the parameter value n is transmitted may be SIB1 or SIB2. The defaultPagingCycle defines a cycle for transmitting paging and is a value defined by default. The defaultPagingCycle may have a value of one of the system frames 32, 64, 128, and 256. The modification period may be referred to as a BCCH modification period.

A cell in which the UE completes camped on or a cell in which data service is supported in the RRC connection mode is defined as a serving cell of the UE. Here, the reference for completion of the camping serving as the reference of the serving cell may be a complete MIB acquisition, a complete system acquisition (MSI) acquisition, or a system information set (i.e., MSI and MSI acquisition) And a complete SI set acquisition (OSI) which the terminal determines to be necessary.

First, a description will be given of a case where camping is defined to be completed when the MIB is received.

The MIB may include a downlink frequency bandwidth, an SFN, an RMSI scheduling information, a spare bit, and a CRC (Cyclic Redundancy Check).

The information on the downlink frequency bandwidth can be, for example, composed of 3 bits, indicating a total of 8 different frequency bandwidths. The frequency bandwidth indicated by each bit value may be predefined frequency bandwidths. In addition, different frequency bandwidths may be indicated according to the frequency band in which the MIB is received. For example, if the MIB is received in the 3GHz band, the values from 000 to 111 may indicate bandwidths of 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, 80 MHz and 160 MHz, respectively. When the MIB is received in the 6GHz or higher band, values from 000 to 111 can indicate bandwidths of 5 MHz, 10 MHz, 20 MHz, 40 MHz, 80 MHz, 160 MHz, 400 MHz and 1 GHz, respectively.

The SFN information may indicate an SFN containing the resource to which the corresponding MIB is transmitted. The length of the bits representing the SFN is determined according to the maximum SFN value defined in the wireless communication system.

For example, if it is necessary to set the system frame length to 10 ms and to set DRX (Discontinuous Reception) period to maximum 10 minutes for ultra low power consumption of the mMTC terminal, the DRX cycle is defined based on the SFN in the system Should be able to do. To do this, a maximum of 65,536 different SFN values can be defined using 16 bits since at least 60000 different SFN values can be defined. That is, the bits required to indicate the SFN are 16 bits.

As an additional example, if it is necessary to set the length of the system frame to 10 ms and set the DRX period to a maximum of one minute, the system should be able to define the DRX period based on the SFN. To do this, we need to be able to have at least 10000 different SFN values, so 10 bits can define up to 10240 different SFN values. That is, the bits necessary for indicating the SFN are 10 bits.

The 3 least significant bits (MSBs) of the SFN indication information having the length of 16 bits or 10 bits are scrambled in the CRC bits in a PBCH (Physical Broadcast CHannel) Lt; / RTI > sequence. The sequence is defined to be the same as the CRC bit length for an 8-bit or 16-bit MIB, and has eight different pieces of bitmap information.

The RMSI scheduling information may include period information on which each MSI is transmitted. The period information may indicate a predefined period value indicated by each bit value, similar to the method of indicating the downlink frequency bandwidth.

For example, if the reference frequency of the corresponding frequency band includes subcarrier spacing (SCS) of 60 kHz or less, RMSI scheduling corresponding to MSI block type 1 (hereinafter referred to as MSI # 1) If the value of the information bit is 0, it is 40ms. If it is 1, it is 80ms. If the SCS exceeds 60 kHz, the value of the RMSI scheduling information bit corresponding to MSI # 1 is 10 ms, and if it is 1, 20 ms. Where the reference newsletter is a predefined newsletter for each frequency band and may be referred to as a default newsletter.

As a further example, the information about the type of the RMSI and the corresponding period value may be defined in units of radio frames and provided in a list form. The period value may be one of 10, 20, 40, 80, 160, 320, and 640. Here, the period value defined as a multiple of 10 (or 10 * 2 ⁿ , where n is a non-negative integer) takes into consideration 10 ms, which is the length of the system frame. In addition, the type can be defined as a system block type 1, a system block type 2, and so on in order to distinguish the system information block and the information included in the block.

Also, the RMSI scheduling information may include the position and / or number information of the OFDM symbol through which the MSI corresponding to the RMSI is transmitted.

A spare bit refers to a bit set as a spare bit for future use in the MIB. 8 bits or 10 bits can be reserved.

The CRC is a parity bit inserted after receipt of the MIB to determine whether there is an error in the information. It may have a length of 8 bits or 16 bits considering the requirements for error detection and the PBCH capacity.

Since the MIB includes the RMSI scheduling information, when the MS completes the MIB reception, the remaining MSI can be received. In addition, when the MS receives the MSI, scheduling information for receiving the OSI is included in the MSI, so that all SI reception is possible. Therefore, after receiving the MIB, the terminal operation can be defined in such a manner that the MSI and the OSI remaining are left as needed. Therefore, it can be said that the camping is performed for the serving cell based on the completion of the MIB acquisition.

Second, it can be defined that camping is completed when the MSI (Minimum System Information) is received (ie, complete MSI acquisition).

The MSI may include information included in the MIB, basic information required for initial cell access, and information necessary for acquiring OSIs other than the MSI.

The basic information necessary for the initial cell connection may include at least random access related information, barring information, PLMN information, Cell ID information, uplink frequency and bandwidth information, and the like. Here, the random access related information includes at least one of PRACH (Physical Random Access CHannel) preamble configuration information, PRACH radio resource (time, frequency, neurometer, etc.) related information, MSG3 transmission Related configuration information, and the like. The barring information may include access class information, access factor information, barring factor information, and the like.

The information required to acquire the OSI may include scheduling information on the OSI. For example, information on resources set in advance so that broadcast cycle information or an on-demand method can be used May be included.

Thus, the MSI contains substantially all the information necessary for the serving cell connection. Therefore, a delay time will occur because the MS can proceed after receiving the MSI in order for the MS to attempt connection after receiving the MIB.

In order to prevent this, information about the initial cell connection may need to be received in advance. Therefore, it can be said that the camping is performed for the serving cell based on the completion of the acquisition of the MSI blocks necessary for the initial cell access.

Thirdly, it can be defined that the camping is completed when the MSI and the OSI (Other System Information) that the terminal deems necessary are received (i.e., complete SI set acquisition).

In general, the method of judging camping is when all SIs have been acquired. However, even if the UE has not received all the SIs after the reception of the SI required by the corresponding UE among all the SIs, the reception of the SI information is not significant. Therefore, if the MS acquires all the OSIs that the MS determines that the MS needs to be received among all MSIs and OSIs that the BS is transmitting or transmitting based on the scheduling information for the OSI in the current MSI, It can be said.

The OSI includes information for MBMS (Multimedia Broadcast Multicast Service), information for cell reselection including an RAT-Inter-Radio Access Technology network, emergency disaster character information transmission (for example, ETWS (Earthquake and Tsunami Information for supporting a specific service or related to a general eMBB service such as a warning system, a commercial automobile alert system (CMAS), a device to device communication or a vehicle to everything (V2X) May be included.

The MS can proceed with the following procedure to receive the OSI excluding the periodically transmitted MSI.

- Step 0: It confirms whether the contents of the SI stored in the UE and the SI are valid SI. Where the SI is checked for both MSI and OSI.

Step 1: The MIB of the selected cell is received. And confirms scheduling information on the RMSI included in the MIB.

Step 2: Receive the NR-PDCCH for receiving the RMSI based on the RMSI scheduling information. The NR-PDCCH includes a DCI scrambled with an RNTI value designated to receive system information, such as SI (System Information) -RNTI.

Step 3: Receive the MSI based on the received RMSI scheduling information and information in the NR-PDCCH.

- Step 4: Receive MSI and check OSI scheduling information.

Step 5: Based on the OSI scheduling information, the UE attempts to receive an OSI to be received.

Step 6: If the UE fails to receive the OSI during the SI transmission period, it requests the BS to transmit the OSI.

If it is determined in step 3 that the MSI has already received the OSI in step 3 or the MS that has received the OSI or the MSI or OSI in the previous BS has lost the validity of the MSI or OSI, It is necessary to receive the corresponding MSI or OSI. For this, the terminal requests the base station and monitors the corresponding MSI or OSI, thereby increasing radio resources and energy consumption. Therefore, in the present disclosure, a method of changing or updating system information that is not based on the request of the terminal will be described in order to improve resource efficiency and energy efficiency.

In addition, when the base station periodically broadcasts all the system information having its own capability, radio resources and energy consumption may increase. In particular, when various system information is configured according to various support systems such as an NR system, the system information to be transmitted by the base station may be diversified and the amount of system information may be greatly increased. Therefore, in this disclosure, a method of informing whether a specific MSI or OSI is transmitted, without periodically transmitting all system information, will be described.

In the present disclosure, it is assumed that the base station constitutes a cell as follows.

The base stations capable of serving a plurality of different frequency bands do not overlap with each other and can form cells by the number of consecutive or non-continuous frequency bands.

A base station having a different physical location may constitute a cell which is partially overlapped or configured with the same frequency band. At this time, each of the different base stations can support services such as dual connectivity through independent beamforming for a specific terminal.

In the present disclosure, it is assumed that system information is configured as follows.

In the RMSI, the scheduling information for at least one of MSI and OSI is configured as follows.

MSI and OSI are classified into System Information Block (SIB), and each block is classified into types. For example, system information block type 1 (SIB1), system information block type 2 (SIB2), and the like are defined. As a non-limiting example, it is assumed that only two types of RMSIs are SIB1 and SIB2 for convenience. That is, all SIBs after SIB3 are assumed to be OSI types.

When transmitting the defined SIB, an index-based system information management method for a certain area and a plurality of overlapping cells is used.

In a case where a plurality of cells exist in a similar or identical base station, some of the system information transmitted by the cells may almost always consist of the same contents. If the same information is transmitted by a plurality of cells, energy and radio resources of the base station may be unnecessarily consumed.

Therefore, in order to reduce the above-mentioned problem, if an index value is commonly set for each specific MSI block or OSI block among system information transmitted from a plurality of cells and system information is transmitted only in some of the cells in which the service area is overlapped among the plurality of cells, And the consumption of energy and radio resources of the base station can be reduced.

Therefore, in order to operate the index-based system information transmission method, the base station and the terminal must be able to grasp the index value for each system block according to predetermined rules. To this end, index information for SIB2 and OSI blocks or OSI blocks may be additionally included in the SIB1. Such index information may include an area ID, a value tag, and the like.

The Area ID can be configured for each SIB.

The range of the Area ID value can be set based on the maximum number of overlapping cells. This is because each cell can have SIBs having cell-specific parameters and thus can have different area IDs. Therefore, when the number of cells is determined by the number of other frequency bands in which a part or all of them are not overlapped with each other in a specific area, the range of the area ID value is the maximum number of cells configurable in the same area in the wireless system Can be defined. For example, assuming that the maximum number of cells that can be aggregated is 32, the value of the area ID may have a value of 0 to 31. Or the number of configurable frequency bands in a single base station, the value of the area ID may have a value from 0 to 63 or from 0 to 127. [

As a further example, the area ID may be replaced by a RNA ID or a TA ID.

The value tag can be defined as a value that increases by one when a specific system information is changed.

A separate value tag corresponding to each SIB may be configured.

In addition, a separate value tag corresponding to the MIB can be constructed.

Alternatively, it may be necessary to perform re-acquisition for all SIs when changing the MIB and / or SIB1. This is because the MIB includes scheduling information for RMSI and SIB1 includes scheduling information for all OSIs. Thus, a separate value tag can be constructed that indicates a change to the overall SI. This value tag is defined as a default value tag (DVT).

In addition, one value tag can be mapped to a specific plurality of SIBs.

The value tag value can have a different range of values since each SIB has a change probability of different system information.

For example, for SIBs that change frequently in the SIB, the value tag should have a wide range of values. This is because if the SIB can be changed more frequently than the monitoring period of the RRC IDLE terminal monitoring system information, or if the period that can be valid without the acquisition of additional SIBs is very long (for example, in case of LTE 3 Time or 48 hours), if the range of the value tag is narrow, it is possible to check the value returned to the same value tag value even though the system information has changed. Therefore, it can be set to have a value ranging from 0 to 31 in order to allocate a sufficiently wide range of value tag values. Alternatively, for SIBs that have little room for change, you can choose to reduce the signaling load by narrowing the value tag value. Therefore, it can be set to have a range of 0 to 3, 0 to 8, or 0 to 16.

As a further example, the range of the value tag set on the basis of the most frequently changeable SIB may be applied equally to the value tags of all SIBs so as to simplify the operation.

Thus, the length of the value tag corresponding to each SIB may be one of 1 to 5 bits, or the value tag corresponding to each SIB may have the length of 5 bits.

Hereinafter, examples of methods for changing or updating system information according to the present disclosure will be described. More specifically, the following embodiments are directed to a method for minimizing an increase in radio resource use and signaling when system information that is not currently being transmitted in a base station is changed, efficiently providing system information to the terminal, and acquiring it.

Specifically, the present disclosure includes a scheme for identifying system information provided in the current network and system information not provided in receiving the system information provided from the network. In addition, the present disclosure relates to a method for providing information for allowing a base station to identify the system information, which is not provided in a network, to terminals, and a method for identifying a system information change and receiving changed system information .

In various examples of this disclosure, the operation of the base station and the terminal may be defined based on the system information change period. The system information change period may be referred to as a BCCH modification period. Unless confused with other terms in the following description, the system information change cycle may be referred to simply as a cycle.

According to the present disclosure, the terminal receives system information block change indication information (for example, value tag) included in the first SIB (for example, SIB1) in the first cycle, Lt; RTI ID = 0.0 > SIB < / RTI > in the second period. Accordingly, the terminal can acquire necessary system information based on the change indication information without requesting the base station to transmit the at least one SIB. In addition, the terminal may stop monitoring the one or more SIBs in a third cycle.

In addition, according to the present disclosure, the terminal can transmit the entire system information change indication information (e.g., DVT) or the system information block change indication information (e.g., value (s)) included in the first SIB tag) of the mobile station. If the terminal detects a change in the DVT value, it attempts to receive all system information blocks (e.g., MIB, SIB1 and other one or more SIBs) in the second period and monitors one or more SIBs in the third period You can stop. If the DVT value is not changed and the system information block change indication information indicates the change of the first system information block, the terminal attempts to receive the first system information block in the second period, Receiving for other SIBs may not be attempted.

The system information block change indication information indicating whether or not the first SIB is changed may not be changed if there is no change in the system information other than that the scheduling information for the other SIBs in the first SIB is changed.

Example  One

The present embodiment relates to a method for determining whether a system information block is transmitted by a base station based on system information block change indication information (for example, a value tag) and whether the system attempts to receive a system information block.

2 is a diagram showing an embodiment of a system information changing operation according to the present disclosure.

For example, when the SI for an SIB (for example, SIB5) that has not been transmitted before the first period (for example, the n-th BCCH modification period) is changed, the base station updates the value tag change value corresponding to the SIB5 It can be included in SIB1 in one cycle (for example, the n-th cycle) and transmitted. Thereafter, the base station can transmit the changed SIB5 in the second period (e.g., the (n + 1) th BCCH modification period). Thereafter, the base station may suspend SIB5 transmission in a third period (e.g., the (n + 2) th BCCH modification period). That is, the first period corresponds to a change notification time interval, the second period corresponds to a time interval in which updated information is provided, the third period corresponds to a transmission stop time Section.

On the other hand, in the example of FIG. 2, when the system information of the SIB (for example, SIB 5) that has been suspended before is changed, the SIB is notified, Indicates that the SIB 12 is periodically transmitted. In this embodiment, it is assumed that the SIB 12 includes a specific parameter in the corresponding cell. Therefore, since the SIB 12 is being periodically transmitted, the procedure of transmitting the change notification and the updated information proceeds in the same manner as in the SIB 5. However, the SIB 12 is periodically transmitted in the transmission stop period of the third period and thereafter.

After acquiring all necessary system information such as MIB, SIB1 and other SIB, the UE can recognize that a specific SIB is not being transmitted.

As a specific example, the UE confirms the scheduling information on the RMSI in the MIB and confirms the scheduling information on the SIB1 to receive the SIB1. Also, the UE can confirm scheduling information (e.g., transmission period information and / or OFDM symbol position and / or number information) for other SIBs included in the received SIB1.

Based on the scheduling information on the other SIBs included in the SIB1, the UE can recognize through the PDCCH monitoring whether the corresponding SIB is transmitted during a specific interval in which the other SIB is to be transmitted. That is, the resource allocation information for the Physical Downlink Shared CHannel (PDSCH) including the SIB is included in the PDCCH scrambled with the SI-RNTI. The UE transmits PDCCH in a blind decoding manner to all candidate resources to which the PDCCH can be transmitted . ≪ / RTI > If the UE fails to receive the PDCCH, it can recognize that the corresponding SIB is not transmitted during the specific period.

Here, the UE can confirm the value tag value for the specific SIB included in the SIB1 without requesting the base station to transmit the SIB that is not being transmitted.

If the terminal receives the SIB1 in the first period and the valid value tag included in the SIB1 indicates the change of the system information for the specific SIB (for example, the value tag value previously stored by the terminal for a specific SIB, , And the value tag value included in the SIB1 is different), it may be determined that the transmission for the specific SIB is to be performed by the base station in the second period, and the base station may not request the transmission of the specific SIB to the base station.

Based on the scheduling information for the SIB1 in the MIB, the terminal can receive SIB1 including the value tag value changed in this way. For example, transmission of SIB1 within a single system information transmission period may be performed once or plural times.

Also, after the value tag value for the specific SIB in the SIB1 is changed, the transmission for the specific SIB within the next system information transmission period can be determined by the scheduling information for the specific SIB in the SIB1. For example, transmission of a specific SIB within a single system information transmission period may be performed once or plural times.

After the third period after the second transmission period, the UE knows in advance that the changed specific SIB will be suspended and may not perform the monitoring operation for the specific SIB.

Here, it is assumed that the first and second periods are n-th and n + 1-th periods, respectively, and the third period in which the transmission is interrupted may be n + K (K is an integer of 2 or more). In this case, the K value can be set considering the terminal that can have the longest DRX period value among the terminals connectable to the corresponding cell. For example, the BCCH modification period should be set to be always larger than the DRX cycle value that can be set by a UE supporting a general eMBB service. However, in the case of the mMTC service, a UE capable of setting DRX in several minutes or longer In the case of a cell, the interval for maintaining the system information transmission can be extended by K BCCH modification periods.

Example  2

This embodiment determines whether or not the base station's system information block is transmitted based on the default system information block change indication information (for example, DVT) and the system information block change indication information (for example, value tag) It is about how to decide whether to try.

3 is a diagram illustrating a further embodiment of a system information change operation according to the present disclosure;

The base station can transmit the DVT change value through the SIB1 when the SIB whose system information is changed in the first period (for example, the n-th BCCH modification period) is SIB1. Thereafter, the BS may transmit all the system information blocks (for example, SIB5, SIB12, etc.) that have been suspended until the second period (for example, the (n + 1) th BCCH modification period). Thereafter, the base station may suspend transmission of SIBs (e.g., SIB5, SIB12) temporarily transmitted in the second period (e.g., the (n + 2) th BCCH modification period). That is, the first period corresponds to a change notification time interval, the second period corresponds to a time interval in which updated information is provided, the third period corresponds to a transmission stop time Section.

After acquiring all necessary system information such as MIB, SIB1 and other SIB, the UE can recognize that a specific SIB is not being transmitted.

As a specific example, the UE confirms the scheduling information on the RMSI in the MIB and confirms the scheduling information on the SIB1 to receive the SIB1. Also, the UE can confirm scheduling information (e.g., transmission period information and / or OFDM symbol position and / or number information) for other SIBs included in the received SIB1.

Based on the scheduling information on the other SIBs included in the SIB1, the UE can recognize through the PDCCH monitoring whether the corresponding SIB is transmitted during a specific interval in which the other SIB is to be transmitted. That is, the resource allocation information for the Physical Downlink Shared CHannel (PDSCH) including the SIB is included in the PDCCH scrambled with the SI-RNTI. The UE transmits PDCCH in a blind decoding manner to all candidate resources to which the PDCCH can be transmitted . ≪ / RTI > If the UE fails to receive the PDCCH, it can recognize that the corresponding SIB is not transmitted during the specific period.

Herein, the terminal can confirm the value tag value for the DVT and the specific SIB included in the SIB1 without requesting the base station to transmit the specific SIB that is not being transmitted.

If the terminal receives the SIB1 in the first period and confirms that the DVT value included in the SIB1 has been changed (for example, the DVT value previously stored by the terminal is different from the DVT value included in the SIB1) It is determined that the transmission of the changed system information including the MIB and SIB1 in the two periods will be performed by the base station and re-acquisition for all other SIBs including the MIB and SIB1 can be performed.

The reason for attempting reacquisition of all other SIBs is that the scheduling information of the other SIBs included in the MIB and SIB1 may be changed, so that it is checked whether the other SIBs are successfully received on the resource allocated according to the changed scheduling information .

That is, if it is assumed that the base station will transmit all the SIBs whose transmission has been suspended after the DVT value is changed, the terminal checks whether the scheduling information for the other SIBs contained in the SIB1 received in the first period is valid by monitoring the PDCCH .

Assuming that there is no procedure for confirming the change of the scheduling information, even if the UE receives the SIB1 information erroneously but fails to recognize the error due to a false alarm and recognizes the erroneous information as correct information, I can not check for information errors. In the case of the RRC IDLE mode terminal, the system information change information transmitted through the paging is received without periodically checking the value tag in the MSI (SIB1) to confirm whether the system information is changed. Therefore, it is impossible to directly check whether the reception of the SIB1 is wrong. For example, when the RRC IDLE mode terminal requests the base station to transmit the system information based on the scheduling information of another SIB having the error, it can transmit information requesting the specific system information to the base station using the random access procedure. Upon receiving the information, the base station proceeds to transmit the specific system information according to the request of the terminal. However, since the UE has erroneous scheduling information, the UE fails to receive the system information. Therefore, the random access procedure is repeatedly performed by the base station.

In order to reduce battery consumption, the RRC IDLE mode terminal proceeds to a DRX operation for monitoring only paging transmission after camped on the corresponding cell, and sets the valid period of the received system information to 3 hours or 24 hours, There is a problem that a random access procedure is repeatedly performed during the period.

Accordingly, the UE can check through the PDCCH monitoring whether the scheduling information for the other SIB included in the SIB1 received in the first period is valid.

Also, at the same time as the DVT value is changed, the value tag value corresponding to all other SIBs can be changed and transmitted. This is to confirm whether the changed scheduling information for a particular SIB is well received and at the same time to confirm that unchanged scheduling information is still valid.

Alternatively, at the same time that the DVT value is changed, only the value tag value corresponding to the changed SIB of the contents in the actual SIB among all the SIBs can be changed and transmitted. The SIB for checking whether the changed scheduling information for a specific SIB is well received is used to indicate that the contents in the actual SIB have not been changed. The SIB indicates whether the PDSCH is to be monitored or not, It is to inform.

After the third period after the second transmission period, the UE knows in advance that the changed specific SIB will be suspended and may not perform the monitoring operation for the specific SIB.

Here, it is assumed that the first and second periods are n-th and n + 1-th periods, respectively, and the third period in which the transmission is interrupted may be n + K (K is an integer of 2 or more). In this case, the K value can be set considering the terminal that can have the longest DRX period value among the terminals connectable to the corresponding cell. For example, the BCCH modification period should be set to be always larger than a DRX cycle value that can be set by a UE supporting a general eMBB service. However, a cell capable of establishing a DRX in several- , The interval for maintaining the system information transmission can be extended by K BCCH modification periods.

Example  3

In this embodiment, when the SIB in which the system information is changed in the first cycle is SIB1, whether the system information block is transmitted or not based on the system information block change indication information (for example, value tag) corresponding to SIB1, And a method for determining whether or not the system information block reception attempt is made.

4 is a diagram illustrating a further embodiment of a system information change operation according to the present disclosure;

If the SIB in which the system information is changed in the first period (for example, the n-th BCCH modification period) is SIB1, the base station transmits the value tag change value corresponding to SIB1 instead of the DVT in the first period (for example, ) In the SIB1. Thereafter, the base station can send the changed SIB1 in the second period (e.g., the (n + 1) th BCCH modification period) and thereafter the same SIB1 until there is an additional change in SIB1 Lt; / RTI > That is, the first period corresponds to a change notification time interval, the second period corresponds to a time interval for providing updated information, the third period corresponds to a normal period, do.

After acquiring all necessary system information such as MIB, SIB1 and other SIB, the UE can recognize that a specific SIB is not being transmitted.

As a specific example, the UE confirms the scheduling information on the RMSI in the MIB and confirms the scheduling information on the SIB1 to receive the SIB1. Also, the UE can confirm scheduling information (e.g., transmission period information and / or OFDM symbol position and / or number information) for other SIBs included in the received SIB1.

Based on the scheduling information on the other SIBs included in the SIB1, the UE can recognize through the PDCCH monitoring whether the corresponding SIB is transmitted during a specific interval in which the other SIB is to be transmitted. That is, the resource allocation information for the Physical Downlink Shared CHannel (PDSCH) including the SIB is included in the PDCCH scrambled with the SI-RNTI. The UE transmits PDCCH in a blind decoding manner to all candidate resources to which the PDCCH can be transmitted . ≪ / RTI > If the UE fails to receive the PDCCH, it can recognize that the corresponding SIB is not transmitted during the specific period.

If there is no system information change other than SIB1, the value tag values corresponding to the other SIBs are kept unchanged, and the transmission interruption can be maintained even for SIBs that have not been transmitted before.

Example  4

This embodiment is for a case in which system information block change indication information (for example, value tag) corresponding to SIB1 is not changed when the SIB whose system information is changed in the first cycle is SIB1.

5 is a diagram illustrating a further embodiment of a system information change operation according to the present disclosure.

If the SIB for which the system information is changed in the first period (for example, the n-th BCCH modification period) is SIB1 and only the scheduling information for the other SIBs is changed from the contents of the SIB1, the base station does not change the DVT value, Do not change the value of the corresponding value tag. That is, when the SIB 1 is transmitted before the scheduling information for the other SIB is changed in the first period (for example, the n-th period), the base station transmits the SIB 1 in the second period It is possible to transmit the changed SIB1 including the scheduling information for the other SIBs, in which case the value tag value for SIB1 may not be changed. Thereafter, the same SIB1 can be transmitted until there is an additional change in SIB1 (i.e., after the third cycle). That is, the first period and the third period correspond to a normal period, and the second period corresponds to a time period during which updated information is provided.

After acquiring all necessary system information such as MIB, SIB1 and other SIB, the UE can recognize that a specific SIB is not being transmitted.

As a specific example, the UE confirms the scheduling information on the RMSI in the MIB and confirms the scheduling information on the SIB1 to receive the SIB1. Also, the UE can confirm scheduling information (e.g., transmission period information and / or OFDM symbol position and / or number information) for other SIBs included in the received SIB1.

Based on the scheduling information on the other SIBs included in the SIB1, the UE can recognize through the PDCCH monitoring whether the corresponding SIB is transmitted during a specific interval in which the other SIB is to be transmitted. That is, the resource allocation information for the Physical Downlink Shared CHannel (PDSCH) including the SIB is included in the PDCCH scrambled with the SI-RNTI. The UE transmits PDCCH in a blind decoding manner to all candidate resources to which the PDCCH can be transmitted . ≪ / RTI > If the UE fails to receive the PDCCH, it can recognize that the corresponding SIB is not transmitted during the specific period.

The value tag values for all SIBs including SIB1 are kept unchanged and the transmission interruption can be maintained for SIBs that have not been transmitted before.

The DVT value is changed in the second embodiment, the value tag value related to the SIB1 is changed in the third embodiment, and the DVT value in the second embodiment is changed in the fourth embodiment Is different in that it does not change both the DVT and the value tag associated with SIB1.

This operation can be separately applied according to the attributes or conditions of the changed contents of the SIB1. For example, when the content change in the SIB 1 includes a change to a part related to another SIB (for example, scheduling information of another SIB), the DVT value Can be changed. Alternatively, when the content change in the SIB 1 does not include a change to a portion related to another SIB (for example, scheduling information of another SIB), the terminal may change the SIB 1 to perform reacquisition for the changed SIB 1 Can change the value tag value corresponding to the value. Alternatively, when the content change in the SIB1 is limited to a portion related to another SIB (for example, scheduling information of another SIB), and there is no substantial change in the content of the SIB1, the value tag of the SIB1 is not changed The changed SIB1 can be transmitted from the next cycle. RRC IDLE mode When the UE desires to receive the SI corresponding to the OSI, it first receives the MIB and the SIB1 and confirms the scheduling information for the SIBs. After recognizing that the SIB to be received is not transmitted, The base station can request the base station to transmit the corresponding SIB.

6 is a flowchart for explaining a system information changing operation according to the present disclosure.

In step S610, the base station determines whether the contents of the first SIB (for example, SIB1) have been changed and the contents of the first system information change instruction information (for example, DVT) and the specific system information The value of the change instruction information (e.g., value tag) can be determined.

For example, when the system information of another SIB (for example, OSI) is changed, the value of the specific system information change instruction information (for example, value tag) for the other SIB is incremented by 1 and included in SIB1 .

When the contents of the SIB 1 are changed, the following operation can be performed. When the changed content of the SIB 1 includes information related to the SIB 1 and other SIBs, the value of the entire system information change indication information (for example, DVT) can be changed and included in the SIB 1. If the changed content of the SIB1 does not include information related to other SIBs but includes an information change specific to the SIB1, the value of the specific system information change instruction information (e.g., value tag) corresponding to the SIB1 is incremented by 1, . If the changed content of the SIB 1 includes only the change of the scheduling information of the other SIBs, the value tag corresponding to the SIB 1 as well as the DVTs may not be changed.

In step S620, the first SIB (for example, SIB1) including the values of the entire system information change instruction information (for example, DVT) and the specific system information change instruction information (for example, value tag) The base station can transmit to the terminal.

In step S630, based on the values of the entire system information change instruction information (for example, DVT) and the specific system information change instruction information (for example, value tag) included in the received first SIB, SIB, or other SIB.

For example, if the DVT value is changed, the terminal may attempt to receive the MIB, the first SIB, and all other SIBs. If a value tag for a specific SIB that has been interrupted before is changed, the terminal may attempt to receive the specific SIB, and may stop monitoring the SIB in a subsequent period. If the value tag for SIB1 is changed, the terminal may attempt to receive the changed SIB1.

7 is a diagram showing a configuration of a base station apparatus and a terminal apparatus according to the present disclosure.

The base station apparatus 700 may include a processor 710, an antenna unit 720, a transceiver 730, and a memory 740.

The processor 710 performs baseband-related signal processing, and may include an upper layer processing unit 711 and a physical layer processing unit 715. The upper layer processing unit 711 may process an operation of a MAC (Medium Access Control) layer, an RRC (Radio Resource Control) layer, or higher layers. The physical layer processing unit 715 can process the operation of the physical (PHY) layer (e.g., uplink received signal processing, downlink transmission signal processing). In addition to performing baseband related signal processing, the processor 710 may also control operation of the entire base station apparatus 700. [

The antenna unit 720 may include one or more physical antennas, and may support multiple input multiple output (MIMO) transmission / reception when the antenna includes a plurality of antennas. The transceiver 730 may include a radio frequency (RF) transmitter and an RF receiver. The memory 740 may store computationally processed information of the processor 710, software related to the operation of the base station device 700, an operating system, applications, and the like, and may include components such as buffers.

The processor 710 of the base station device 700 may be configured to implement base station operation in the embodiments described herein.

For example, the upper layer processing unit 711 of the processor 710 of the base station apparatus 700 may include an index information generating unit 712. The index information generation unit 712 may generate the entire system information block change direction information (e.g., DVT) and the specific system information block change direction information (e.g., value tag).

The index information generating unit 712 generates the system information change instruction information (e.g., DVT) and the system information change instruction information (e.g., DVT) according to whether the content of the first SIB (e.g., SIB1) The value of the specific system information change instruction information (e.g., value tag) can be determined.

For example, when the system information of another SIB (for example, OSI) is changed, the value of the specific system information change instruction information (for example, value tag) for the other SIB is incremented by 1 and included in SIB1 .

When the contents of the SIB 1 are changed, the following operation can be performed. When the changed content of the SIB 1 includes information related to the SIB 1 and other SIBs, the value of the entire system information change indication information (for example, DVT) can be changed and included in the SIB 1. If the changed content of the SIB1 does not include information related to other SIBs but includes an information change specific to the SIB1, the value of the specific system information change instruction information (e.g., value tag) corresponding to the SIB1 is incremented by 1, . If the changed content of the SIB 1 includes only the change of the scheduling information of the other SIBs, the value tag corresponding to the SIB 1 as well as the DVTs may not be changed.

The physical layer processing unit 715 of the processor 710 of the base station apparatus 700 may include an SI transmitting unit 716. SI transmission unit 716 can transmit system information such as MIB, SIB1, and other SIBs generated in the upper layer to the terminal 750 by mapping the system information on physical resources. In addition, the SI transmitting unit 716 may transmit the changed system information block in the second period and stop the transmission in the third period when the specific system information block that has not been transmitted until the first period is changed.

The terminal apparatus 750 may include a processor 760, an antenna unit 770, a transceiver 780, and a memory 790.

The processor 760 performs baseband-related signal processing and may include an upper layer processing unit 761 and a physical layer processing unit 765. The upper layer processing unit 761 may process the operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 765 can process the operation of the PHY layer (e.g., downlink reception signal processing, uplink transmission signal processing). The processor 760 may control the operation of the entire terminal apparatus 750 in addition to performing the baseband-related signal processing.

The antenna unit 770 may include one or more physical antennas, and may support MIMO transmission / reception when the antenna includes a plurality of antennas. The transceiver 780 may include an RF transmitter and an RF receiver. The memory 790 may store information processed by the processor 760, software related to the operation of the terminal apparatus 750, an operating system, applications, and the like, and may include components such as buffers.

The processor 760 of the terminal device 750 may be configured to implement the operation of the terminal in the embodiments described in the present invention.

The physical layer processing unit 765 of the processor 760 of the terminal apparatus 750 may include an SI receiving unit 766. [ The SI receiving unit 766 can receive the system information transmitted from the base station apparatus 700. Based on the scheduling information on the SIB1 included in the MIB and the scheduling information on other SIBs included in the SIB1, It may attempt to receive system information from the designated physical resource. Or may attempt to receive system information in a blind decoding manner.

The upper layer processing unit 761 of the processor 760 of the terminal device 750 may include an index information checking unit 762. [ The index information verifying unit 762 receives the index information (for example, the total system information change instruction information (e.g., DVT) and the specific system information change instruction information included in the first SIB (e.g., SIB1) (For example, a value tag)).

For example, when the index information verifying unit 762 confirms that the DVT value received in the first period is changed, the reception of the MIB, the first SIB, and all other SIBs is performed through the SI receiving unit 766 in the second period You can try. If the index information verifying unit 762 confirms that the value tag for the specific SIB that has been suspended in the first period has been changed, it tries to receive the specific SIB through the SI receiving unit 766 in the second period And monitoring of the specific SIB can be stopped in the third cycle. If it is confirmed that the value tag for SIB1 is changed in the first period, it can attempt to receive the changed SIB1 through the SI receiver 766 in the second period. Also, even when the index information verifying unit 762 confirms that there is no value tag change for the SIB1, the SI receiving unit 766 can continue to receive SIB1 according to the period.

In the operation of the base station apparatus 700 and the terminal apparatus 750, the same elements as those of the exemplary embodiments of the present invention can be applied, and a duplicate description will be omitted.

Although the exemplary methods of this disclosure are represented by a series of acts for clarity of explanation, they are not intended to limit the order in which the steps are performed, and if necessary, each step may be performed simultaneously or in a different order. In order to implement the method according to the present disclosure, the illustrative steps may additionally include other steps, include the remaining steps except for some steps, or may include additional steps other than some steps.

The various embodiments of the disclosure are not intended to be all-inclusive and are intended to illustrate representative aspects of the disclosure, and the features described in the various embodiments may be applied independently or in a combination of two or more.

In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays A general processor, a controller, a microcontroller, a microprocessor, and the like.

The scope of the present disclosure is to be accorded the broadest interpretation as understanding of the principles of the invention, as well as software or machine-executable instructions (e.g., operating system, applications, firmware, Instructions, and the like are stored and are non-transitory computer-readable medium executable on the device or computer.

Claims (1)

A method for receiving system information in a wireless communication system,
Receiving a first system information block (SIB) including the entire system information change instruction information and the specific system information change instruction information in a first cycle;
Attempting to receive all of the MIB (Master Information Block), the first SIB, and the one or more second SIBs in the second period when the value of the total system information change instruction information is changed;
Attempting to receive the first SIB or the at least one second SIB associated with the specific system information change indication information in the second period when the value of the specific system information change indication information is changed; And
And stopping monitoring of the one or more second SIBs in a third cycle.

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