KR20180122776A - Method and apparatus for operating system information in wireless communication system - Google Patents

Abstract

The present invention relates to a method and an apparatus for operating system information. According to an embodiment of the present invention, a method for a terminal to receive system information in a wireless communication system comprises the steps of: obtaining index information and cell range information through a master information block (MIB); determining whether a minimum system information (MSI) block and an other system information (other SI) block are received based on the index information and the cell range information; and receiving at least one of the determined MSI block or the other SI block based on a determination result.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for operating system information in a wireless communication system,

This disclosure relates to wireless communication systems, and more particularly, to a method and apparatus for operating 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. However, there is no specific method for reducing the consumption of radio resources caused by system information transmission in the NR system and reducing energy consumption in the base station and the terminal.

SUMMARY OF THE INVENTION It is a technical object of the present invention to provide a method and apparatus for identifying system information to be received by a terminal.

A further technical object of the present invention is to provide a method and an apparatus for receiving only system information required by a terminal, except for system information overlapping system information already stored in the terminal.

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 for receiving system information in a wireless communication system according to an aspect of the present disclosure includes: obtaining index information and cell range information through a master information block (MIB); Determining whether to receive a minimum system information (MSI) block and another system information (other SI) block based on the index information and the cell range information; And receiving at least one of the MSI block or the different system information block determined based on the determination result.

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.

SUMMARY OF THE INVENTION According to the present disclosure, a technical object of the present disclosure is to provide a method and apparatus for identifying system information to be received by a terminal.

According to the present disclosure, a method and apparatus for receiving only system information required by a terminal, excluding system information that overlaps system information already stored by the terminal, 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.
FIG. 2 is a diagram for explaining a method of providing an index value for each system block according to the present disclosure to a terminal through higher layer signaling.
3 is a diagram for describing a method of providing an index value and a cell range value according to the present disclosure;
4 is a diagram for explaining operations of a terminal according to an example of the present disclosure.
5 is a diagram for explaining the operation of a base station according to an example of the present disclosure.
6 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, FH-OFDMA, and non-orthogonal multiple access (NOMA). 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: SAE-Temporary Mobile Subscriber Identity

- IMSI: International Mobile Subscriber Identity

One of the next generation mobile communication systems is under discussion on NR system under study. In the NR system, a new RRC mode can be set to support the case where the load of the communication service requested by the terminal is low or not. This new RRC mode is hereinafter referred to as RRC inactive mode. The scope of the present disclosure is not limited by this name and includes a new RRC mode that is distinguished from an RRC connected mode and an RRC idle mode.

The RRC inactive mode may be set by the base station or the terminal depending on whether the wireless communication service related to the terminal is loaded or not. The present disclosure provides a method for supporting a case where a UE set in RRC inactive mode moves to another base station or cell within a network coverage area. The operation of the network (for example, the network node (s) including the base station) and the terminal will be described. By using the scheme according to the present disclosure, it is possible to maintain the RRC mode that facilitates service support for terminals moving in the network.

Hereinafter, a handover scheme and a tracking area update (TAU) scheme for maintaining a connection state of a mobile terminal with a network in consideration of requirements of a next generation mobile communication system will be described first, and a RNA update Explain the method.

Different types of services (eg, realistic content, mobile holographic display, smart home service, etc.) required for a next generation mobile communication system can be largely classified into three service types, eMBB, URLLC, and mMTC. The requirements for supporting the above three service types may include various items, and the same requirement items must satisfy different criteria according to the service type.

For example, with respect to the requirement item for the latency, in the case of the eMBB service, data conforming to various types and purposes may have different reliability for each channel through which the data is transmitted. For example, there may be various criteria such as 1%, 0.01%, or 0.001% error rate for data with different QoS. For example, regarding the delay time occurring in the unidirectional communication between the second layer (layer 2) and the second layer (layer 2) in the terminal based on the above reliability, in the case of the eMBB service, In case of the URLLC service, it may be required that the delay time is 0.5 ms or less.

In order to satisfy various requirements standards, signaling between a UE and a network is required to support radio resource control and mobility of the UE as well as units of radio resources defined by time, frequency, and space, which are the basic units of the physical channel It can have a big impact. Therefore, the requirement criterion is defined such as 5ms based on the situation where 0.001% error occurs with respect to the delay time and reliability in the control plane (CP) communication.

Conventional fourth-generation wireless communication systems, such as LTE, define RRC connected (RRC connected) and RRC idle (RRC idle) modes. The RRC connected mode is an RRC mode for maintaining a wireless connection between a terminal and a base station in order to support real-time voice call and wireless data service. The RRC idle mode is a state in which the PLMN and the cell are camped on after including the moment when the initial power-on of the terminal is completed, or the state in which the UE has released the RRC connection by the network in the RRC connection mode or when it is determined that the RRC connection mode can not be maintained because it is determined that the mobile station has released a signal or the mobile station is out of the service area due to a failure to find a signal of the network, and the like.

In addition, the RRC inactive mode is defined as follows.

A feature of the RRC deactivation mode is that it uses RNA (RAN-based notification area). The purpose of the RNA is similar to that of the TA (Tracking Area). That is, the RNA may correspond to a range for transmitting a paging signal for one terminal. RNA composition is also similar to TA. That is, the RNA may consist of one or more cells or base stations. However, 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.

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 the like.

Alternatively, a cell or a base station included in the RNA may provide the terminal with the ID value of the RNA containing the cell. The RNA ID value is included in system information (SI) and is broadcasted. The terminal can confirm the RNA to which the terminal belongs by checking the RNA ID value. Here, the system information block to which the RNA ID value may be included may be an MSI block including scheduling information for other SI blocks among MIB (Master Information Block) or MSI (Minimum System Information) blocks.

A cell in which the UE has 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 criterion of camping completion which is a reference of the serving cell can be defined according to the following three methods.

The first way is to define camping completion based on complete MIB acquisition.

The MIB may include SFN, TRS and / or MRS configuration information, RMSI scheduling information, Spare information, cyclic redundancy check (CRC) information, and the like, including a downlink frequency bandwidth, a resource to which the MIB is transmitted have.

The downlink frequency bandwidth information may indicate a total of eight different frequency bandwidths when the downlink frequency bandwidth is indicated by, for example, 3 bits.

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, when the MIB is received in the 3GHz band, it may correspond to values of 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, 80 MHz, and 160 MHz from '000' to '111'. For example, when an MIB is received in a band of 6 GHz or more, the values of '000' to '111' may correspond to values of 5 MHz, 10 MHz, 20 MHz, 40 MHz, 80 MHz, 160 MHz, 400 MHz and 1 GHz.

The SFN information including the resource to which the MIB is transmitted can be determined in accordance with the maximum SFN value defined in the wireless communication system. If it is necessary to set the system frame length to 10ms and to set the DRX cycle to maximum 10 minutes for ultra low power consumption of the mMTC terminal, the DRX cycle should be defined based on the SFN in the corresponding system. Therefore, to be able to have at least 60000 different SFN values for this, it is possible to define up to 65536 different SFN values using 16 bits. That is, the bits required to indicate the SFN are 16 bits.

The RMSI scheduling information may include period information in which each MSI (Minimum System Information) is transmitted. Similar to the method of indicating the downlink frequency bandwidth, the period information may be a predefined period value of the period value indicated by each bit value. For example, when the subcarrier spacing (SCS) of the reference frequency band is less than 60 kHz, if the value of the bit corresponding to MSI block type 1 (hereinafter referred to as MSI # 1) is '0' 40ms and '1', it is 80ms. On the other hand, when the SCS exceeds 60 kHz, if the value of the bit corresponding to MSI # 1 is '0', it is 10 ms and if it is '1', it is 20 ms. Where the reference memorandum is a predefined neuroregory for each frequency band and may be referred to as a default neuroregory.

In addition, the number of OFDM symbols to which the MSI corresponding to the RMSI is transmitted may be included.

The Spare information is a bit set as a reserved bit for future use. 8 bits or 10 bits can be reserved.

The CRC information is a parity bit inserted after receiving the MIB to determine whether there is an error in the information. A length of 8 bits or 16 bits in consideration of requirements for error detection and PBCH (Physical Broadcast Channel) capacity.

Thus, since the MIB includes the RMSI scheduling information, the remaining MSI can be received when the reception of the MIB is completed. In addition, scheduling information for receiving other system information (other SI) is included in the MSI. Therefore, when the reception of the MIB is completed, all SI reception is possible. Therefore, after receiving the MIB, the terminal operation can be defined in such a manner that the reception of the remaining MSI and other SI is performed if necessary. Therefore, it can be said that the camping is performed for the serving cell based on the completion of the MIB acquisition.

The second way is to define camping completion based on complete MSI acquisition.

The MSI may further include the information contained in the MIB and the following information.

Specifically, the MSI may include basic information required for initial cell access and information necessary for acquiring other SIs except MSI. For example, the MSI may include resource information, that is, scheduling information, which is set in advance so that broadcast cycle information or an on-demand method can be used.

The basic information required for the initial cell connection may include at least random access related information, barring related information, PLMN information, Cell ID information, uplink frequency and bandwidth information, and the like.

For example, the random access-related information includes information on PRACH (Physical Random Access Channel) preamble configuration information, PRACH radio resource (time, frequency, And message 3 (MSG3) transmission-related configuration information to be transmitted based on the message.

Barring related information may include access class information, barring factor information, and the like.

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 completion of acquisition of the MSI blocks necessary for the initial cell connection or completion of acquisition of all the MSI blocks.

The third way is to define the camping completion based on the MSI and the complete SI set acquisition that the terminal deems necessary.

In general, the method of determining 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 acquisition of other SIs that all of the MSIs and other SIs determined to be necessary by the corresponding UE is completed, the corresponding serving cell is camped.

The other SI includes information for MBMS (Multimedia Broadcast Multicast Service), information for cell reselection including an inter RAT (Radio Access Technology) network, emergency disaster character information transmission (for example, ETWS (Earthquake and Tsunami Warning System Information for services other than the general eMBB service, such as a device-to-device communication or a vehicle-to-everything (V2X) service.

The MS proceeds with the following procedure to receive the other SI excluding the periodically transmitted MSI.

Step 0: Confirm the SI stored in the terminal. Where the SI is verified for both the MSI and the other SI.

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 a designated RNTI value to receive system information, such as an SI-RNTI.

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

Step 4: Receive the MSI and check the scheduling information of the other SI.

Step 5: Based on the scheduling information of the other SI, the UE attempts to receive the other SI to be received.

Step 6: If the UE fails to receive the other SI to be received during the SI transmission period, the base station requests the base station to transmit the other SI.

In the present disclosure, a method of informing whether a base station transmits MSI or other SI in Step 1 and Step 4 of the system information reception procedure will be described. In this disclosure, a description will be given of a method of distinguishing the MSI requiring Step 3 and / or the other SI requiring Step 5 in the system information reception procedure. In the present disclosure, a method for determining whether or not the terminal needs Step 6 during the system information reception procedure will be described.

First, for the sake of a specific explanation of the examples of this disclosure, it can be assumed that the base station constitutes a cell as follows.

For example, it can be assumed that base stations capable of serving a plurality of different frequency bands do not overlap with each other, and can form cells as many as consecutive frequency bands. Further, it can be assumed that base stations having different physical positions can construct a cell partially overlapping or configured with the same frequency band. At this time, it can be assumed that each of the different base stations can support services such as dual connectivity through independent beamforming for a specific terminal.

Embodiments constituting the system information in the present disclosure will be specifically described below.

Example  One

The present embodiment is directed to an index-based system information configuration method for a predetermined area and a plurality of overlapping cells.

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. When a plurality of cells transmit the same information, energy and radio resources of the base station may be unnecessarily consumed.

Therefore, in order to reduce the above problem, an index value is commonly set for a specific MSI block or other SI blocks among system information transmitted from a plurality of cells, and system information is transmitted only in some cells among cells where service areas are overlapped among the plurality of cells It is possible to reduce unnecessary base station energy and radio resource consumption.

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 values of the system blocks according to predetermined rules as follows.

Example  1-1

The present embodiment is directed to providing an index value for each system block to the terminal through higher layer signaling.

When the UE completes the cell selection for the first time and proceeds with the SI acquisition immediately after the power is applied, it must receive all the SI required by the UE.

If the UE transits to the RRC connected state through the serving cell, the RRC connection reconfiguration message informs the BS of the information about the range of the cell in which the index value set for each MSI block and the other SI block is always the same as the data value in the SI block Lt; / RTI >

Specifically, a corresponding index value may be configured for each MSI or other SI block type in the RRC connection reconfiguration message, and a positive value for a cell range corresponding to the index value may be set.

Here, the set value may indicate all the cells in the TA, indicate all the cells in the RNA, or configure specific cells based on the Cell ID value. Here, the Cell ID may be a PCI (PhysCellId) value.

Also, if each MSI or other SI block type includes MBMS related information, an index value and an MBSFN area index value may be allocated for uniformity of format.

Alternatively, the UE may know in advance an SI block type in which each MSI or other SI block type includes MBMS related information. In this case, the MBSFN area index value is included in a specific MSI block (hereinafter referred to as a scheduling MSI block) including scheduling information for the other SI, and the MS receives the scheduling MSI block to receive the other SI, You can check the MBSFN area index value. If the MBSFN area index value corresponding to the stored MBMS-related SI and the received MBSFN area index value are the same, the MBMS-related SI is maintained and the reception of the MBMS-related other SI blocks of the serving cell is not performed have.

For example, if there are three MSI blocks and seven other SI blocks, an RRC message can be constructed as shown in Table 1 below.

MSI block or other SI block Index information MSI # 1 index # 1, common in current TA MSI # 2 index # 1, common in current TA MSI # 3 index # 2, for Cell # 1, # 2, # 3 Other SI # 1 index # 1, common in current TA Other SI # 2 index # 2, for Cell # 1, # 2, # 3 Other SI # 3 index # 3, for Cell # 1, # 3 Other SI # 4 index # 3, for Cell # 1, # 3 Other SI # 5 index # 4, only for current cell Other SI # 6 index # 5, common in current TA (RRC IDLE), common in current RNA (RRC inactive) Other SI # 7 index # 6, MBSFN area index = 1,
or
The MBSFN area index or index list value contained in the scheduling MSI block

Hereinafter, the TA will be described.

When the terminal does not receive the wireless communication service in the RRC IDLE mode, the terminal requests the wireless communication service to the corresponding terminal from the partner terminal or the server in the network, or requests the data transmission from the user or the application program using the terminal , It is necessary to be able to start the wireless communication service immediately.

Accordingly, when a correspondent terminal or a server in the network requests a wireless communication service to the corresponding terminal, the network transmits a paging signal to establish an RRC connection with the terminal. 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 region. 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 a mobility management entity (MME). Each base station transmits the 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.

2 is a diagram for explaining a method of providing an index value for each system block to a terminal through higher layer signaling.

The embodiment 1-1 will be described in more detail with reference to Fig.

UE 201 may select Cell # 1 202 and initiate SI reception after power is first applied. At this time, the MIB transmitted from the Cell # 1 202 may be received first (step 210).

The UE 201 may receive the MSI # 1 based on the DCI information in the NR-PDCCH including the RMSI in the MIB and the scheduling information for the MSI (step 211).

When the UE 201 selects another cell according to the cell reselection procedure, the UE 201 can select the Cell # 2 203 having the same TA ID value since the UE 201 has never transitioned to the RRC connected state. However, since the UE 201 has not received the index information for the SI blocks, the UE 201 re-acquires the MIB and MSI # 1 again for the Cell # 2 (steps 215 and 217).

If the UE 201 transits to the RRC connection state through the RRC connection establishment procedure 220 in step 220, the base station 203 informs the UE 201 of the index value for each SI block and the index value in the RRC connection reconfiguration procedure It is possible to transmit information on the corresponding cell range.

The UE 201 may then transition to the RRC idle mode via the RRC connection release procedure 230 and the Cell # 3 204 via the cell reselection procedure 235. In this case, after confirming that Cell # 3 (204) is the cell in the same TA after receiving the MIB (step 240) and confirming it is Cell # 3 (204) If UE 201 knows that Cell # 3 is included in the received index and cell range information, UE 201 recognizes that it is not necessary to separately receive MSI # 1. If information for cell connection is included in the MSI # 1, the UE 201 can proceed to the RRC connection establishment procedure (step 250) without proceeding to the MSI # 1 reception procedure.

Example  1-2

This embodiment provides an index value and a cell range value for the MSI through the MIB and an index value and a cell range value for the other SI through the scheduling MSI.

In the embodiment 1-1 described above, since the terminal transits to the RRC connected state at least once and receives information from the base station, the terminal having no transition to the RRC connected state or the terminal at least once in the RRC connected state But has not transitioned from the TA including the cell in which the current UE is located to the RRC connected state and the UE moves to the RRC IDLE state or the RRC inactive state, the index value information can not be obtained or is no longer valid. This will require continuous acquisition of the MSI and will require all other SIs that are always needed whenever the terminal selects another cell. This can be an obstacle to the effect of the index-based SI transmission (that is, energy consumption reduction and resource consumption reduction of the terminal and the base station).

In order to solve such a problem, in the embodiment 1-2, the RRC IDLE or the RRC inactive terminal can also provide index information corresponding to each system block through the MIB which must always receive.

Here, the MIB is transmitted through the PBCH, and the PBCH includes the MIB, which is the SI first received by the UE, and is frequently transmitted as compared with the other SI because the UE also plays the role of acquiring system frame synchronization. Thus, only the most important information necessary for initial system information acquisition is included. This makes the size of the MIB that the PBCH can transmit very limited.

Therefore, in order to reduce the amount of information required to provide the index value for the MSI through the MIB, the range of cells in which the index value and the data value in the SI block are always the same may be fixed. For example, index # 1 is always meant for all cells in the TA (tracking area), and index # 2 may always mean that it may be different for every cell.

Therefore, the index value for each MSI block may be provided in the form of a bitmap. The length of the bitmap is determined by the total number of MSI blocks. The number of total MSI blocks may be fixed. Each bit in the bitmap has a one-to-one correspondence with each MSI block. In addition, the position of each bit in the bitmap and the MSI block type value are fixedly set.

For example, if the number of MSI blocks is 3, '0' means index # 1 and '1' means index # 2. Also, in 'xyz', z may be defined as MSI # 1, y as MSI # 2, and x as bits representing index information for MSI # 3.

The SI block to which the index value and the cell range value information for the MSI are transmitted can always be transmitted through the MSI block requiring acquisition of the SI of the corresponding serving cell. The scheduling information for the MSI block may be included in the MIB and additional scheduling information may be transmitted through the NR-PDCCH. The MSI block need not be indexed and should always be transmitted. The MSI block may be referred to as an always on MSI block. The MSI block may be a scheduling MSI block.

In the same way, an index value for the other SI block in the scheduling MSI block can be provided. For example, if the number of other SI blocks is 5, '0' means index # 1 and '1' can mean index # 2. Also, in 'vwxyz', z represents other SI # 1, y represents other SI # 2, x represents other SI # 3, w represents other SI # 4, and v represents index information for other SI # 5 Bit. ≪ / RTI >

3 is a diagram for explaining a method of providing an index value and a cell range value for MSI through the MIB and providing an index value and a cell range value for other SI through a scheduling MSI.

The embodiment 1-2 will be described in more detail with reference to Fig.

UE 301 may select Cell # 1 302 and initiate SI reception after power is first applied. At this time, the UE 301 may first receive the MIB transmitted from the Cell # 1 302 (step 310). In the MIB, an index value for each SI block and information on a cell range corresponding thereto are included.

The UE 301 may receive the MSI # 1 based on the DCI information in the NR-PDCCH including the RMSI in the MIB and the scheduling information for the MSI (step 311). here,

From the index # 1, the UE 301 can confirm that the MSI # 1 is common to all the cells in the TA.

It can be recognized that the UE 301 does not need to separately receive the MSI # 1 after confirming the Cell # 2 303 selected through the cell reselection procedure (Step 313). For example, the UE 301 determines the MSI # 1 of the corresponding cell # 2 through the index value for each SI block in the MIB 315 transmitted by the Cell # 2 303 and the cell range information corresponding thereto 1 and the cell range are the same as the index and cell range of MSI # 1 of Cell # 1, or if it is confirmed that the cell is within the same TA as Cell # 1 through the TA ID value in the always transmitted MSI, MSI # 1 It can be recognized that there is no need to separately receive.

If information for cell connection is included in the MSI # 1, the MS 301 can proceed to the RRC connection establishment procedure (step 320) without proceeding to the MSI # 1 reception procedure.

After that, the UE 301 transitions to the RRC IDLE state through the RRC connection release procedure (Step 330) with the base station, and can select the Cell # 3 304 through the cell re-selection procedure 335 again. In this case, the UE 301 can confirm through the MIB 350 transmitted through the Cell # 3 (304) that Cell # 3 is not included in the cell range where the index value corresponding to the MSI # 1 is valid have. Alternatively, the UE 301 may confirm that the cell is not the same cell as the Cell # 1 through the TA ID value in the MSI transmitted through the Cell # 3. Thus, the UE 301 may re-receive the MIB for Cell # 3 (step 345) and re-acquire MSI # 1 (step S350).

Example  2

The present embodiment relates to a method for the terminal to recognize whether the MSI and the other SI are transmitted.

Example  2-1

This embodiment is directed to a method for indicating whether MSI and other SI are transmitted through a value tag for each index.

For example, in the above-described index-based SI transmission method, one system information value tag (SIVT) can be allocated by grouping SI blocks corresponding to each index value. The SIVTs corresponding to the respective index values may be included in the scheduling MSI block or included in the always on MSI block.

As a further example, there may be a terminal that does not receive the other SI because it does not need the other SI, only if the other SI in the MSI and other SI is changed. In this case, the change of the other SI may be meaningless. Therefore, the SIVT may be allocated to the SI block corresponding to each index separately from the MSI and the other SI. For this reason, a separate SIVT may be allocated to the MBMS in addition to the MBMS supporting terminal only

As a further example, the SIVT value may be a value from 0 to 31. [ If the SIVT value is '0', it means that the SI block (s) indicated by the SIVT is not transmitted.

Example  2-2

The present embodiment is directed to a method for indicating whether MSI and other SI are transmitted in the form of a bitmap in a scheduling MSI block.

It is possible to transmit information on whether or not the MSI block for the index # 1 is transmitted based on the index information for each MSI block in the MIB block as in the embodiment 1-2 described above.

In this case, each cell may transmit information on whether or not to transmit MSI blocks having an index value # 1 among the MSI blocks in the scheduling MSI block in a bitmap form.

Also, the scheduling MSI block is always transmitted and the scheduling information for the scheduling MSI block may be included in the MIB.

For example, when the number of MSI blocks having index # 1 is 3, 'xyz' indicates that z is an MSI block having the lowest block type value among the MSI blocks having index # 1, Lt; RTI ID = 0.0 > MSI < / RTI >

In addition, the SI block to which the MSI block transmission / non-transmission information for the MSI is transmitted may be transmitted through the MSI block that requires acquisition of the SI of the corresponding serving cell at all times, not the MIB. The scheduling information for the MSI block may be included in the MIB, and additional scheduling information may be transmitted through the NR-PDCCH. The MSI block may be defined as having no index setting and always being transmitted.

It is possible to transmit information on the other SI block for index # 1 based on the index information of the other SI block in the scheduling MSI block in the form of a bitmap, as in the case of the above-described embodiment 1-2. These bitmaps can be configured according to a configuration scheme similar to the MSI block transmission information bitmap.

4 is a diagram for explaining operations of a terminal according to an example of the present disclosure.

The example of FIG. 4 may correspond to the operation of the terminal according to the embodiment 1-2 described above.

The UE may proceed with the cell selection procedure after the first power-on (step 410).

After receiving the MIB transmitted from the cell selected by the UE, the UE can check the index information (step 420).

After receiving the MSI based on the information in the MIB, the UE can receive the other SI required by itself based on the scheduling information of the other SI included in the MSI (step 430).

The UE may proceed to the cell reselection procedure when it is necessary (step 440).

The MS can check the MIB and / or the MSI transmitted from the re-selected cell and check the index and corresponding cell ID information and / or TA ID information (step 450).

Based on the identified cell ID information and / or TA ID, the terminal may determine whether additional reception for the MSI and / or other SI is required (step 460).

5 is a diagram for explaining the operation of a base station according to an example of the present disclosure.

The example of FIG. 5 may correspond to the operation of the base station according to the above-described embodiment 1-2.

The base station can derive negotiable common information through communication between a single base station or a plurality of base stations including cells having the same TA or overlapping coverage areas. Based on the results thus obtained, the base station determines an index allocated to each MSI block in the MIB, determines an index value indicating which MSI block is composed of common or each cell-specific parameter, The range information may be included in the MIB and transmitted (step 510). The base station determines an index assigned to each of the other SI blocks in the MSI, determines an index value indicating which of the other SI blocks constituted by the common or each cell-specific parameter, and supplies the corresponding cell range information to the MSI (Step 520).

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

The base station apparatus 600 may include a processor 610, an antenna unit 620, a transceiver 630, and a memory 640.

The processor 610 performs baseband-related signal processing, and may include an upper layer processing unit 611 and a physical layer processing unit 615. The upper layer processing unit 611 can process an operation of a MAC (Medium Access Control) layer, an RRC (Radio Resource Control) layer, or higher layers. The physical layer processing unit 615 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 610 may also control operation of the entire base station apparatus 600. [

The antenna unit 620 may include one or more physical antennas and may support Multiple Input Multiple Output (MIMO) transmission and reception when the antenna unit 620 includes a plurality of antennas. The transceiver 630 may include a radio frequency (RF) transmitter and an RF receiver. The memory 640 may store computationally processed information of the processor 610, software related to the operation of the base station device 600, an operating system, an application, and the like, and may include components such as buffers.

The processor 610 of the base station device 600 may be configured to implement base station operation in the embodiments described herein.

For example, the processor 610 may include a message transmission unit 611, an SI resource control unit 613, a message reception unit 615, and an index information generation unit 617.

The SI resource control unit 613 determines SI blocks and information to be transmitted through negotiation with other cells and a base station, and configures SI information and resources to be transmitted according to the determination.

The index information generation unit 617 can construct index information based on the SI information determined by the SI resource control unit 613 and resources to be transmitted.

The message transmission unit 611 can transmit the finally configured SI (i.e., SI information and index information) to the UE through the radio resource determined by the SI resource control unit 613. [

The terminal apparatus 650 may include a processor 660, an antenna unit 670, a transceiver 680, and a memory 690. [

The processor 660 performs baseband related signal processing and may include an upper layer processing unit 661 and a physical layer processing unit 665. [ The upper layer processing unit 661 may process the operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 665 can process the operation of the PHY layer (e.g., downlink received signal processing, uplink transmission signal processing). The processor 660 may control the operation of the entire terminal device 650 in addition to performing the baseband-related signal processing.

The antenna unit 670 may include one or more physical antennas, and may support MIMO transmission / reception when the antenna includes a plurality of antennas. The transceiver 680 may include an RF transmitter and an RF receiver. The memory 690 may store information processed by the processor 660, software related to the operation of the terminal device 650, an operating system, an application, and the like, and may include components such as a buffer.

The processor 660 of the terminal device 650 may be configured to implement the operation of the terminal in the embodiments described in the present invention.

The processor 660 of the terminal device 650 may include an SI information storage unit 661, a message reception unit 663, an SI reception determination unit 665, and a message transmission unit 667.

The message receiving unit 663 may receive the MIB first and then transmit the received MIB to the SI information storing unit 661. [

The SI information storage unit 661 stores all received data if there is no stored SI. If there is MIB data already stored, the SI information storage unit 661 stores data values having different indexes, data having the same index And the like to the SI reception determination unit 665. [

The SI reception determination unit 665 may determine an MSI to be received from the MSI block and an MSI to not receive from the MSI block by comparing the previously stored index value with the received index value. The SI reception determination unit 660 may transmit the determined information to the message reception unit 663 to control the reception of the necessary MSI.

In the operation of the base station apparatus 600 and the terminal apparatus 650, 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 a terminal to receive system information in a wireless communication system,
Acquiring index information and cell range information through a master information block (MIB);
Determining whether to receive a minimum system information (MSI) block and another system information (other SI) block based on the index information and the cell range information; And
And receiving at least one of the MSI block or the different system information block determined based on the determination result.

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