WO2018117677A1

WO2018117677A1 - Operation method for communication node transmitting system information in communication network

Info

Publication number: WO2018117677A1
Application number: PCT/KR2017/015214
Authority: WO
Inventors: 이정훈; 김민현; 김지형; 김철순; 문성현; 박주호; 이준환
Original assignee: 한국전자통신연구원
Priority date: 2016-12-22
Filing date: 2017-12-21
Publication date: 2018-06-28

Abstract

Disclosed is an operation method for a communication node transmitting system information in a communication network. The operation method for a communication node transmitting system information in a communication network according to one embodiment of the present invention is an operation method for a base station which transmits system information in a communication network, and comprises the steps of: configuring information on a request time when system information is requested and a transmission time when the system information is transmitted in a communication network; transmitting a message including the configured information on the request time and the transmission time by using a broadcast-based method; receiving, from at least one user equipment included in the communication network, a message requesting the system information on the basis of the request time; and transmitting a message including the system information to the at least one user equipment on the basis of the transmission time.

Description

Operation method of communication node transmitting system information in communication network

The present invention relates to a method of operating a communication node for transmitting system information in a communication network, and more particularly, to a method of operating a communication node for transmitting system information in response to a request of system information in a communication network. .

In a communication network, a user equipment may generally transmit and receive data through a base station. For example, if there is data to be transmitted to the second terminal, the first terminal may generate a message including the data to be transmitted to the second terminal, and transmit the generated message to the first base station to which it belongs. have. The first base station may receive a message from the first terminal, and may confirm that the destination of the received message is the second terminal. The first base station may transmit a message to the second base station to which the second terminal which is the confirmed destination belongs. The second base station may receive a message from the first base station, and may confirm that the destination of the received message is the second terminal. The second base station may transmit a message to the second terminal which is the confirmed destination. The second terminal may receive a message from the second base station, and may obtain data included in the received message.

On the other hand, in a communication network, a terminal may transmit downlink-related information (eg, frequency, time synchronization, and cell ID) based on a synchronization signal periodically transmitted from a base station. Etc.) can be obtained. Thereafter, the terminal may form a radio link to the base station, and may obtain system information transmitted from the base station through the formed radio link. Thereafter, the terminal may access the base station by performing an access procedure for the base station based on the system information.

As such, system information transmitted from the base station may be periodically transmitted regardless of the request of the terminal. That is, in a communication network, a base station periodically transmits system information even without a request for system information. Accordingly, the base station can unnecessarily transmit system information in the communication network, and thus there is a problem in that the radio resource cannot be efficiently used.

An object of the present invention for solving the above problems is to provide a method for operating a communication node for transmitting system information in response to a request of system information in a communication network.

A method of operating a base station for transmitting system information in a communication network according to an embodiment of the present invention for achieving the above object, the request time and the system information of the system information in the communication network Setting information on a transmission time of the mobile terminal; transmitting a message including the set request time and information on the transmission time based on a broadcast method; at least one terminal included in the communication network Receiving a message for requesting the system information from the request time from the request and transmitting the message including the system information to the at least one terminal based on the transmission time.

Here, the information on the request time may include information on the time at which the request for the system information is possible.

Here, the time point at which the request for the system information is possible may be one of a first time point preset for the request of the system information in the at least one terminal and a second time point that allows uplink transmission in the at least one terminal. Can be.

Here, the message for requesting the system information may be received from the at least one terminal when the request for the system information is possible.

Here, the information on the transmission time may include one of information on the time point at which the system information is transmitted from the base station and information on at least one time interval in which the system information is transmitted.

Here, the time point at which the system information is transmitted is one of a first time point that is after a preset time from a time point at which the message for requesting the system information is received and a second time point preset for periodically transmitting the system information by the base station. Can be.

Here, when the message including the system information is transmitted in the at least one time interval, the message may be transmitted based on a plurality of redundant versions within the at least one time interval.

According to another aspect of the present invention, there is provided a method of operating a communication node for transmitting system information in a communication network, the method for operating a base station for transmitting system information in a communication network. Receiving a message requesting the system information from a plurality of groups including at least one terminal in the communication network, setting a plurality of parameters for transmission of system information for each of the plurality of groups And transmitting a message including system information about the plurality of groups based on the set plurality of parameters.

Here, the message for requesting the system information may be transmitted based on the RACH preamble which is a resource preset by the base station for the request of the system information.

here. The plurality of parameters may include a transmission time at which the system information is transmitted and an identifier used to transmit the system information.

The setting of the plurality of parameters may include transmitting first system information for a first group included in the plurality of groups and second system information for a second group included in the plurality of groups. The time and the identifier may be set to distinguish the first system information and the second system information.

Here, in the setting of the plurality of parameters, when the transmission time of the first system information and the second system information are set to be the same, the identifiers of the first system information and the second system information may be set differently. Can be.

Here, in the setting of the plurality of parameters, when setting the transmission time of the first system information and the second system information differently, the identifiers of the first system information and the second system information are the same. Can be set.

An operation method of a communication node for transmitting system information in a communication network according to another embodiment of the present invention for achieving the above object is an operation method of a terminal for receiving system information in a communication network, the communication network Receiving a message including information on a request time of the system information and a transmission time of the system information transmitted from a base station of the base station, and transmitting a message requesting the system information based on the request time. And receiving a message including the system information from the base station based on the transmission time.

Here, the time point at which the request for the system information is possible may be one of a first time point preset for the request for the system information at the terminal and a second time point at which uplink transmission is possible at the terminal.

Here, the time point at which the system information is transmitted is a first time point that is after a preset time from the time point at which the message for requesting the system information is received by the base station, and the second time point that is preset for periodically transmitting the system information at the base station It may be one of the viewpoints.

Here, the message including the system information may be received based on one of the time point at which the system information included in the information on the transmission time is transmitted and the at least one time interval.

Here, when the message including the system information is received in the at least one time interval, the message may be received based on a plurality of redundant versions within the at least one time interval.

According to the present invention, a communication node serving as a base station in a communication network can effectively use radio resources by transmitting system information only when system information is required.

1 is a conceptual diagram illustrating a first embodiment of a communication network.

2 is a block diagram illustrating an embodiment of a communication node constituting a communication network.

3 is a conceptual diagram illustrating an embodiment of a type 1 frame.

4 is a conceptual diagram illustrating an embodiment of a type 2 frame.

5 is a flowchart illustrating a method of operating a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

6 is a conceptual diagram illustrating a first embodiment of a method of operating a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

7 is a conceptual diagram illustrating a second embodiment of a method of operating a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

8 is a conceptual diagram illustrating a third embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

9 is a conceptual diagram illustrating a fourth embodiment of a method of operating a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

10 is a conceptual diagram illustrating a fifth embodiment of a method of operating a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

11 is a conceptual diagram illustrating a sixth embodiment of a method of operating a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

12 is a flowchart illustrating a method of operating a communication node for transmitting system information in a communication network according to another embodiment of the present invention.

13 is a conceptual diagram illustrating a method of operating a communication node for transmitting system information in a communication network according to another embodiment of the present invention.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In the following description of the present invention, the same reference numerals are used for the same elements in the drawings and redundant descriptions of the same elements will be omitted.

1 is a conceptual diagram illustrating an embodiment of a communication network.

Referring to FIG. 1, the communication network 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Here, the communication network 100 may be referred to as a "communication system". Each of the plurality of communication nodes may support at least one communication protocol. For example, each of the plurality of communication nodes may include a code division multiple access (CDMA) based communication protocol, a wideband CDMA (WCDMA) based communication protocol, a time division multiple access (TDMA) based communication protocol, and a frequency division multiple (FDMA) based communication protocol. access based communication protocol, orthogonal frequency division multiplexing (OFDM) based communication protocol, orthogonal frequency division multiple access (OFDMA) based communication protocol, single carrier (SC) -FDMA based communication protocol, non-orthogonal multiple An access based communication protocol and a space division multiple access (SDMA) based communication protocol may be supported. Each of the plurality of communication nodes may have a structure as follows.

Referring to FIG. 2, the communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 that communicates with a network. In addition, the communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, and the like. Each component included in the communication node 200 may be connected by a bus 270 to communicate with each other.

The processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260. The processor 210 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may be configured as at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory 220 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

Referring back to FIG. 1, the communication network 100 includes a plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and a plurality of user equipments. ) 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell. Each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may belong to the coverage of the first base station 110-1. The second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong to the coverage of the second base station 110-2. The fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong to the coverage of the third base station 110-3. . The first terminal 130-1 may belong to the coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong to the coverage of the fifth base station 120-2.

Here, each of the base stations 110-1, 110-2, 110-3, 120-1, and 120-2 is a NodeB, an evolved NodeB, a base transceiver station (BTS), Radio base station, radio transceiver, access point, access node, road side unit (RSU), radio remote head (RRH), transmission point (TP) It may be referred to as a transmission and reception point (TRP), a relay node, and the like. Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is a terminal, an access terminal, a mobile terminal, It may be referred to as a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, or the like.

A plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6 Each may support cellular communication (eg, long term evolution (LTE), LTE-A (advanced, etc.) as defined in the 3rd generation partnership project (3GPP) standard). Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in different frequency bands, or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other through an ideal backhaul or a non-ideal backhaul, and an ideal backhaul. Alternatively, information can be exchanged with each other via non-ideal backhaul. Each of the base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to a core network (not shown) through an ideal backhaul or a non-idal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 receives a signal received from the core network, corresponding terminal 130-1, 130-2, 130-3, 130. -4, 130-5, 130-6, and the signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) core network Can be sent to.

Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may support downlink transmission based on OFDMA and uplink based on SC-FDMA. Can support transport. In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may transmit multiple input multiple output (MIMO) (eg, single user (SU) -MIMO, Multi-user (MU) -MIMO, massive MIMO), CoMP (coordinated multipoint) transmission, carrier aggregation transmission, transmission in unlicensed band, device to device, D2D ) Communication (or ProSeimity services). Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is a base station 110-1, 110-2, 110-3, 120-1 , 120-2), and operations supported by the base stations 110-1, 110-2, 110-3, 120-1, and 120-2.

For example, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 based on the SU-MIMO scheme, and the fourth terminal 130-4 may transmit the signal based on the SU-MIMO scheme. The signal may be received from the second base station 110-2. Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 based on the MU-MIMO scheme, and the fourth terminal 130-4 may be used. And each of the fifth terminals 130-5 may receive a signal from the second base station 110-2 by the MU-MIMO scheme. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may transmit a signal to the fourth terminal 130-4 based on a CoMP scheme, and a fourth The terminal 130-4 may receive a signal from the first base station 110-1, the second base station 110-2, and the third base station 110-3 by the CoMP scheme. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 includes terminals 130-1, 130-2, 130-3, 130-4, which belong to its own coverage. 130-5 and 130-6) and a signal may be transmitted and received based on a carrier aggregation scheme. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 coordinates D2D communication between the fourth terminal 130-4 and the fifth terminal 130-5. The fourth terminal 130-4 and the fifth terminal 130-5 may each perform D2D communication by coordination of each of the second base station 110-2 and the third base station 110-3. Can be performed.

Meanwhile, the communication network may support a frequency division duplex (FDD) scheme, a time division duplex (TDD) scheme, and the like. A frame based on the FDD scheme may be defined as a “type 1 frame”, and a frame based on the TDD scheme may be defined as a “type 2 frame”.

3 is a conceptual diagram illustrating an embodiment of a type 1 frame.

Referring to FIG. 3, the radio frame 300 may include ten subframes, and the subframe may include two slots. Thus, the radio frame 600 may include 20 slots (eg, slot # 0, slot # 1, slot # 2, slot # 3, ..., slot # 18, slot # 19). The length Tf of the radio frame 300 may be 10 ms. The subframe length may be 1 ms. The slot length Tslot may be 0.5 ms. Here, Ts may be 1 / 30,720,000 s.

The slot may consist of a plurality of OFDM symbols in the time domain and may consist of a plurality of resource blocks (RBs) in the frequency domain. The resource block may be composed of a plurality of subcarriers in the frequency domain. The number of OFDM symbols constituting the slot may vary depending on the configuration of a cyclic prefix (CP). CP may be classified into a normal CP and an extended CP. If a regular CP is used, the slot may consist of seven OFDM symbols, in which case the subframe may consist of fourteen OFDM symbols. If the extended CP is used, the slot may consist of six OFDM symbols, in which case the subframe may consist of twelve OFDM symbols.

4 is a conceptual diagram illustrating an embodiment of a type 2 frame.

Referring to FIG. 4, the radio frame 400 may include two half frames, and the half frame may include five subframes. Thus, the radio frame 400 may include ten subframes. The radio frame 400 length Tf may be 10 ms. The length of the half frame may be 5ms. The subframe length may be 1 ms. Here, Ts may be 1 / 30,720,000 s.

The radio frame 400 may include a downlink subframe, an uplink subframe, and a special subframe. Each of the downlink subframe and the uplink subframe may include two slots. The slot length Tslot may be 0.5 ms. Among the subframes included in the radio frame 400, each of subframe # 1 and subframe # 6 may be a special subframe. The special subframe may include a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).

The downlink pilot time slot may be considered as a downlink period and may be used for cell search, time and frequency synchronization acquisition, etc. of the UE. The guard period may be used for solving the interference problem of uplink data transmission caused by the downlink data reception delay. In addition, the guard period may include a time required for switching from the downlink data reception operation to the uplink data transmission operation. The uplink pilot time slot may be used for uplink channel estimation, time and frequency synchronization acquisition, and the like.

The length of each of the downlink pilot time slot, the guard period, and the uplink pilot time slot included in the special subframe may be variably adjusted as necessary. In addition, the number and position of each of the downlink subframe, the uplink subframe, and the special subframe included in the radio frame 400 may be changed as necessary.

Referring to FIG. 5, a communication network according to an embodiment of the present invention may mean a new radio (NR) communication system. The NR communication system may be a communication system supporting communication at frequencies below 6 GHz, as well as frequencies above 6 GHz. As such, an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention may be performed at a base station. That is, a communication node transmitting system information in a communication network according to an embodiment of the present invention may mean a base station.

First, the base station may set the information about the request time of the system information and the transmission time of the system information in the communication network (S100). Here, the information on the request time of the system information may include information on the time at which the request for the system information is possible in at least one terminal included in the communication network. For example, the time point at which the request for system information is possible may be one of a first time point preset in the base station for requesting the system information in at least one terminal and a second time point in which uplink transmission is possible in at least one terminal. Can be.

In addition, the transmission time of the system information is information on the transmission time when the system information is transmitted from the base station is at least one time interval (in the present invention information about the time when the system information is transmitted from the base station and the system information is transmitted) Information about a time window). For example, the point in time at which the system information is transmitted may be one of a first point in time after a preset time from a point in time at which a message for requesting system information is received and a second point in time for periodically transmitting system information from the base station. have. In addition, the at least one time interval in which the system information is transmitted may be one time interval or a plurality of time intervals. In this case, when the time interval for transmitting system information is set to a plurality of time intervals, the plurality of time intervals may be set periodically or aperiodically.

Thereafter, the base station may transmit a message including information on the set request time and transmission time based on the broadcast method (S200). In detail, the base station may generate a message including information on a request time for requesting system information from at least one terminal included in a communication network and information on a transmission time for transmitting system information from the base station. Thereafter, the base station may transmit a message including information on the request time and information on the transmission time based on the broadcast method.

For example, the message including the information on the request time of the system information and the transmission time of the system information is the minimum system information (minimum-) which means the system information that is always needed at least one terminal included in the communication network. It may mean a message including SI). That is, the information about the request time of the system information and the information about the transmission time of the system information may be periodically included in the minimum system information transmitted from the base station. In addition, the information on the request time of the system information and the information on the transmission time of the system information may be included in the configuration information of the RRC parameter for at least one terminal and transmitted.

Accordingly, at least one terminal included in the communication network may receive a message including information on the request time and information on the transmission time transmitted from the base station based on the broadcast scheme. Thereafter, at least one terminal included in the communication network may transmit a message requesting system information to the base station based on the request time. In detail, the at least one terminal may check the time at which the system information can be requested from the information on the request time at which the system information can be requested. Thereafter, the at least one terminal may transmit a message requesting system information to the base station based on the identified time point.

That is, when the time indicated by the request time of the system information is the first time point (at least one time point previously set for requesting the system information), the at least one terminal transmits a message requesting the system information to the first time point. Can be. On the other hand, at least one terminal may transmit a message for requesting the system information to the second time point when the time indicated by the request time of the system information is a second time point (at least one time point when uplink transmission is possible from one terminal).

In this case, the message for requesting the system information transmitted from at least one terminal included in the communication network may be in the form of a scheduling request (SR) message and a RACH preamble (RACH preamble) transmitted from the at least one terminal. . In addition, the message requesting system information transmitted from at least one terminal may be a separate message generated to request system information. For example, when a message requesting system information transmitted from at least one terminal is transmitted based on the RACH preamble, the RACH preamble may be a contention-free RACH preamble.

Thereafter, the base station may receive a message for requesting system information based on the request time from the at least one terminal (S300). That is, the message for requesting the system information received from the base station may be received at one of the first time point and the second time point, which is the time point indicated by the request time of the system information.

Thereafter, the base station may transmit a message including the system information to at least one terminal based on the transmission time (S400). Specifically, when the base station sets the transmission time at which the system information is transmitted to the time point at which the system information is transmitted, at least one terminal transmits a message including the system information at one of the first time point and the second time point, which are the set time points. Can be sent to.

On the other hand, when the base station sets the transmission time at which the system information is transmitted to at least one section in which the system information is transmitted, the base station may transmit a message including the system information to at least one terminal in at least one set interval. In this case, the base station may transmit a message including system information to at least one terminal based on a plurality of redundant versions within at least one time interval.

Accordingly, at least one terminal may receive a message including system information from the base station based on the transmission time. That is, a message including system information received from at least one terminal may be received at one of a time point and a transmission interval indicated by a transmission time of system information. Specifically, the at least one terminal may monitor the reception of the system information at one of a time point and a transmission interval indicated by the transmission time of the system information. For example, at least one terminal may monitor a system information-RNTI (SI-RNTI) of a physical downlink control channel (PHCCH) of the base station.

For example, at least one terminal may receive a transmission time of the system information indicates a transmission interval, and a message including the system information may be received in the transmission period indicated by the transmission time of the system information. In this case, at least one terminal may receive a message including system information based on a plurality of duplicated versions within at least one time interval.

Meanwhile, in the communication network according to an embodiment of the present invention described with reference to FIG. 5, a base station for transmitting system information may transmit a requestable time for system information to a first time point or a second time point (uplink transmission of at least one terminal). It has been described as settable). However, the base station may not set a first time point or a second time point that is a time point at which system information can be requested.

In this case, the base station may set only information on the transmission time of the system information in step S100, and may transmit a message containing only information on the transmission time of the system in step S200 in a broadcast manner. Accordingly, at least one terminal is unable to obtain information about the request time of the system information. In this case, at least one terminal may transmit a message for requesting system information to the terminal at the time when uplink transmission is possible as in the second time point described with reference to FIG. 5.

Hereinafter, a plurality of embodiments (first to sixth embodiments) of a method of operating a communication node for transmitting system information in a communication network according to an embodiment of the present invention described with reference to FIG. 5 will be described. This may be specifically described with reference to FIGS. 6 to 11.

Referring to FIG. 6, a communication network according to an embodiment of the present invention may include a base station 610 and a plurality of terminals 621 to 627 for transmitting system information. The plurality of terminals may include a first terminal 621, a second terminal 622, a third terminal 623, a fourth terminal 624, a fifth terminal 625, and a sixth terminal 626. . The base station 610 and the plurality of terminals 621 to 627 included in the communication network may refer to the base station and the terminal described with reference to FIG. 1, and are similar to the structure of the communication node described with reference to FIG. 2 or It may have the same structure.

First, in the communication network, the plurality of terminals 621 to 627 may generate a message requesting system information at each of the plurality of terminals 621 to 627, and transmit a message requesting system information to the base station 610. Can transmit In detail, the plurality of terminals 621 to 627 may transmit a message requesting system information to the base station 610 at a time point in which uplink transmission is possible in each of the plurality of terminals 621. That is, when the message for requesting system information is transmitted when uplink transmission is possible, the point in time when the system information can be requested is not set in advance, or the point in time when uplink transmission is possible is set in advance as a point in time to request system information. can do.

Accordingly, the base station 610 may receive a message for requesting system information from each of the plurality of terminals 621 to 627 at the time when uplink transmission of each of the plurality of terminals 621 to 627 is possible. Thereafter, the base station 610 may transmit a message including the system information to each terminal at a time after the preset time from the time when the message for requesting the system information is received. That is, the message including the system information is transmitted when the message requesting the system information is received after a preset time from when the message for requesting the system information is received. The time when the system information is transmitted corresponds to the transmission time described with reference to FIG. 5. It may mean that it is set to one time point.

For example, the base station 610 may receive a message requesting system information from the first terminal 621 at a first time point. Thereafter, the base station 610 transmits the message including the system information to the first terminal 621 at a second time point after a preset time from a first time point when the message for requesting system information from the first terminal 621 is received. Can transmit In addition, the base station 610 may receive a message requesting system information from the second terminal 622 at a third time point. Thereafter, the base station 610 transmits a message including the system information to the second terminal 622 at a fourth time point that is after a preset time from a third time point when the message for requesting system information from the second terminal 622 is received. Can transmit Through this method, the base station 610 may transmit a message including system information to each of the plurality of terminals 621 to 627.

Referring to FIG. 7, a communication network according to an embodiment of the present invention may include a base station 610 and a plurality of terminals 621 to 627 for transmitting system information as described with reference to FIG. 6. First, the plurality of terminals 621 to 627 included in the communication network may generate a message requesting system information at each of the plurality of terminals 621 to 627, and transmit a message requesting system information to the base station 610. ) Can be sent. In detail, the plurality of terminals 621 to 627 may transmit a message requesting system information to the base station 610 at a time point in which uplink transmission is possible in each of the plurality of terminals 621. That is, the message for requesting the system information is transmitted when the uplink transmission is possible, as in FIG. 6, when the system information request time is not set in advance, or when the uplink transmission is possible, the system information can be requested. It may mean a preset point of view.

Accordingly, the base station 610 may receive a message for requesting system information from each of the plurality of terminals 621 to 627 at the time when uplink transmission of each of the plurality of terminals 621 to 627 is possible. Thereafter, the base station 610 may transmit a message including the system information to the plurality of terminals 621 to 627 at a point in time at which the system information is transmitted. That is, the transmission of the message including the system information at a preset time point at which the system information is transmitted may mean that the time point at which the system information is transmitted is set to a second time point corresponding to the transmission time described with reference to FIG. 5. .

For example, the first terminal 621, the second terminal 622, and the third terminal 623 transmit uplink of each of the first terminal 621, the second terminal 622, and the third terminal 623. At this time, a message for requesting system information may be generated and a message for requesting system information may be transmitted to the base station 610. Accordingly, the base station 610 is the first terminal 621, the second terminal 622 and the third terminal 623 from the first terminal 621, the second terminal 622 and the third terminal 623, respectively. At a time point in which uplink transmission is possible, messages sequentially request for system information may be received. Subsequently, when a preset time point at which the system information is transmitted elapses, the base station 610 transmits a message including the system information to the first terminal 621, the second terminal 622, and the third terminal 623 at the preset time point. ) Can be sent.

Thereafter, the fourth terminal 624, the fifth terminal 625, the sixth terminal 626, and the seventh terminal 627 are the fourth terminal 624, the fifth terminal 625, and the sixth terminal 626. And a message for requesting system information at the time when uplink transmission of each of the seventh terminal 627 is possible, and a message for requesting system information may be transmitted to the base station 610. Accordingly, the base station 610 from the fourth terminal 624, the fifth terminal 625, the sixth terminal 626 and the seventh terminal 627, the fourth terminal 624, the fifth terminal 625, When the uplink transmission of each of the sixth terminal 626 and the seventh terminal 627 is possible, a message for sequentially requesting system information may be received. Subsequently, when a preset time point at which the system information is transmitted elapses, the base station 610 sends a message including the system information at the preset time point to the fourth terminal 624, the fifth terminal 625, and the sixth terminal 626. ) And the seventh terminal 627. Through this method, the base station 610 may transmit a message including system information to each of the plurality of terminals 621 to 627.

Referring to FIG. 8, the communication network according to an embodiment of the present invention includes a base station 610 for transmitting system information, a first group 620-1 including at least one terminal, and a second group 620-2. ) May be included. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to FIGS. 6 to 7. In addition, the second group 620-2 includes a fourth terminal 624, a fifth terminal 625, a sixth terminal 626, and a seventh terminal 627 described with reference to FIGS. 6 to 7. can do.

First, the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 request the system information at a predetermined time point to request the system information. The message may be generated, and a message for requesting system information may be transmitted to the base station 610. That is, when the message for requesting system information is transmitted at a preset time point, it means that the time point at which the system information can be requested is preset in the base station 610, and information about the preset time point is obtained from the base station 610. can do.

Accordingly, the base station 610 is the first terminal 621, the second terminal 622 and the third terminal 623 included in the first group 620-1 at a point in time that can be requested system information. May receive a message requesting system information from the system. Subsequently, the base station 610 may generate system information at a predetermined time point at which the system information is transmitted, and the first terminal (620) may include a message including the generated system information in the first group 620-1. 621, the second terminal 622, and the third terminal 623.

Through this method, the base station 610 is the fourth terminal 624, the fifth terminal 625, the sixth terminal included in the second group 620-2 at a point in time at which the system information can be requested in advance. A fourth terminal 624 included in the second group 620-2 may be received from the 626 and the seventh terminal 627 and request a message for requesting system information, and set at a point in time at which the system information is transmitted. ), A message including system information may be transmitted to the fifth terminal 625, the sixth terminal 626, and the seventh terminal 627.

Referring to FIG. 9, a communication network according to an embodiment of the present invention may include a base station 610 for transmitting system information and a first group 620-1 including at least one terminal. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to FIGS. 6 to 7.

Accordingly, the base station 610 is the first terminal 621, the second terminal 622 and the third terminal 623 included in the first group 620-1 at a point in time that can be requested system information. May receive a message requesting system information from the system. Thereafter, the base station 610 may generate system information in at least one time interval (in FIG. 9, one time interval) set as a time interval in which system information is transmitted, and includes a message including the generated system information. May be transmitted to the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1.

In detail, the time interval during which the system information is transmitted from the base station 610 is system information from the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1. The message may start from a preset time after the message requesting the received message. In this case, the base station 610 may transmit a message including the system information at any point within the time interval in which the system information is transmitted.

However, when the base station 610 is not secured a downlink resource for transmitting a message including the system information, the downlink resource for transmitting a message including the system information within the time interval in which the system information is transmitted At this point, the message including the system information can be transmitted. That is, the time point at which the system information is transmitted from the base station 610 may mean a time point at which downlink resource is secured.

In addition, the base station 610 may transmit a message including the system information based on a plurality of duplicated versions in at least one time interval which is preset as a time interval in which system information is transmitted. Accordingly, the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 may have only one of a plurality of duplicate versions of a message including system information. Even when receiving, system information can be obtained.

Meanwhile, in the communication network according to an embodiment of the present invention, the base station 610 may set a plurality of time intervals for transmitting system information. In this case, the base station 610 may set the plurality of time intervals based on a preset period. That is, the plurality of time intervals may be periodically set based on a preset period. In this case, the base station 610 may transmit a message including system information based on a plurality of duplicated versions in each of the plurality of time intervals.

For example, the base station 610 may transmit a message including system information based on the first duplicated version in a first time interval of the plurality of time intervals. In addition, the base station 610 may transmit a message including system information based on a second duplicated version different from the first duplicated version in a second time interval that is a time interval after the first time interval among the plurality of time intervals. . That is, the base station 610 may transmit a message including system information based on different overlapping versions for a plurality of times.

Referring to FIG. 10, a communication network according to an embodiment of the present invention may include a base station 610 for transmitting system information and a first group 620-1 including at least one terminal. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to FIGS. 6 to 7.

First, the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 request the system information at a predetermined time point to request the system information. The message may be generated, and a message for requesting system information may be transmitted to the base station 610. In this case, the terminal 620-3 that does not request system information may exist at a preset time point among the plurality of terminals included in the communication network. That is, when the message for requesting system information is transmitted at a preset time point, it means that the time point at which the system information can be requested is preset in the base station 610, and information about the preset time point is obtained from the base station 610. can do.

At this time, the terminal 620-3, which did not request the system information, did not request the system information to the base station 610, but previously obtained information on the transmission time at which the message including the system information is transmitted from the base station 610. In one case, a message including system information transmitted from the base station 610 may be received. Through this method, the terminal 620-3 that fails to request system information from the communication network to the base station 610 may receive a message including system information transmitted from the base station 610.

Referring to FIG. 11, referring to FIG. 10, a communication network according to an embodiment of the present invention includes a base station 610 for transmitting system information and a first group 620-1 including at least one terminal. can do. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to FIGS. 6 to 7.

First, the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 request the system information at a predetermined time point to request the system information. The message may be generated, and a message for requesting system information may be transmitted to the base station 610. Here, the message for requesting system information at a preset time point may be used based on a scheduling request message transmitted through the PUCCH, which is an uplink control channel. That is, system information requested at a predetermined time point may be requested through a scheduling request message transmitted through a PUCCH, which is an uplink control channel.

Accordingly, the base station 610 is the first terminal 621, the second terminal 622 and the third terminal 623 included in the first group 620-1 at a point in time that can be requested system information. May receive a message requesting system information from the system. In this case, the terminal 620-3 that does not request system information may exist at a preset time point among the plurality of terminals included in the communication network. As such, the terminal 620-3 that fails to request system information may request system information at any time other than a preset time point for requesting system information. For example, when the system information is requested at any time other than a preset time point for requesting the system information, the terminal that does not request the system information may be piggybacked through the PUSCH, which is an uplink data channel. You can send a message requesting information.

Accordingly, the base station 610 may receive a message for requesting system information from the terminal 620-3 that fails to request system information. Subsequently, the base station 610 may generate system information at a predetermined time point at which the system information is transmitted, and the first terminal (620) may include a message including the generated system information in the first group 620-1. 621, the second terminal 622, the third terminal 623, and the terminal 620-3 that cannot request the system information.

Through such a method, when a plurality of terminals included in the communication network transmit a message requesting system information at a preset time point, the base station 610 transmits a message requesting system information based on a PUCCH, which is an uplink control channel. Can be sent. In addition, when a plurality of terminals included in the communication network transmit a message requesting system information through an arbitrary time, the terminal may transmit a message requesting system information to the base station 610 based on an uplink data channel PUSCH. have.

Meanwhile, although the terminal 620-3 that has not requested system information in the communication network according to an embodiment of the present invention has been described as requesting system information based on the PUSCH, it may not be limited thereto. That is, at least one terminal other than the terminal 620-3 that fails to request system information among the plurality of terminals included in the communication network according to an embodiment of the present invention receives a message for requesting system information based on the PUSCH. It may also transmit to the base station 610.

Referring to FIG. 12, a communication network according to another embodiment of the present invention may be the same as the communication network described with reference to FIG. 5. That is, the communication network according to another embodiment of the present invention may mean an NR communication system supporting communication at a frequency of 6 GHz or more, as well as a frequency lower than 6 GHz. As such, an operation method of a communication node for transmitting system information in a communication network according to another embodiment of the present invention may be performed at a base station. That is, a communication node transmitting system information in a communication network according to another embodiment of the present invention may mean a base station.

First, the base station may receive a message for requesting system information from a plurality of groups including at least one terminal in the communication network (S1210). Here, the plurality of groups may include a first group including at least one terminal and a second group including at least one terminal. In addition, the plurality of groups may be divided by terminals for transmitting a message for requesting system information at a preset time point for requesting system information. For example, the at least one terminal included in the first group may be a terminal capable of requesting system information at a first time point, which is a preset time point, or may be a terminal requiring first system information requestable at the first time point. The at least one terminal included in the second group may be a terminal capable of requesting system information at a second time point, which is a preset time point, or may be a terminal requiring second system information requestable at a second time point. That is, at least one terminal included in the first group and at least one terminal included in the second group may be the same as or different from each other.

Here, the message for requesting the system information is transmitted at a preset time point, the time when the system information can be requested by the base station is set in advance, and a plurality of terminals included in the communication network have previously obtained information on the preset time point. Can mean to be. For example, the base station may preset a first time point for requesting the first system information and a second time point for requesting the second system information. Thereafter, the base station may transmit information about the time point (which may mean information on the request time) set for the request of each system information to a plurality of terminals included in the communication network in advance.

In addition, a resource used to transmit a message requesting system information may be preset in the base station, and information about the preset resource may be previously transmitted to a plurality of terminals included in the communication network. For example, a resource used for transmitting a message requesting system information at the terminal may be a RACH preamble, and may be transmitted together with information on a time point set for requesting system information.

Specifically, when the base station sets the first time point for the request of the first system information and the second time point for the request of the second system information to be the same, the RACH preamble and the second used for the request of the first system information The RACH preamble used for requesting system information may be set differently. In addition, when differently setting a first time point for requesting the first system information and a second time point for requesting the second system information, the RACH preamble and the second system information used for the request of the first system information are different. The RACH preamble used for the request may be set identically. Accordingly, a message for requesting system information received from a plurality of groups may be received based on information on resources and resources on a predetermined time point for requesting system information.

Thereafter, the base station may set a plurality of parameters for transmission of system information for each of the plurality of groups (S1220). The plurality of parameters set in the base station may include a transmission time for transmitting system information and an identifier used for transmission of system information. Here, the identifier may be an SI-RNTI used for transmitting system information. Specifically, the base station determines the transmission time and identifier for the first system information for the first group included in the plurality of groups and the second system information for the second group included in the plurality of groups. The second system information may be set to be distinguished.

For example, when the base station sets the transmission time of the first system information and the transmission time of the second system information to be the same, the base station may set different identifiers of the first system information and the second system information. On the contrary, when the transmission time of the first system information and the transmission time of the second system information are set differently, the base station may set the same identifiers of the first system information and the second system information.

Thereafter, the base station may transmit a message including system information about the plurality of groups based on the set plurality of parameters (S1230). Specifically, when the base station sets the transmission time of the first system information and the transmission time of the second system information to be the same, the base station may generate a message including each of the first system information and the second system information having different identifiers. And send the generated message. In contrast, when the transmission time of the first system information and the transmission time of the second system information are set differently, the base station may generate a message including the first system information and the second system information each having the same identifier. You can send the generated message.

Accordingly, at least one terminal included in each of the plurality of groups may receive a message including system information transmitted from the base station. In this case, at least one terminal included in each of the plurality of groups is used to transmit system information when the transmission time of the first system information for the first group and the transmission time of the second system information for the second group are the same. SI-RNTI, which is an identifier, can be monitored and system information can be identified through this.

In a communication network according to another embodiment of the present invention described with reference to FIG. 12, a base station for transmitting system information sets a transmission time for transmitting system information after receiving a message requesting system information from a plurality of groups. It has been described as, but not limited to. That is, in a communication network, a base station may preset information on a transmission time at which system information is transmitted (for example, whether or not the transmission times of system information of a plurality of groups are equal) before receiving a message requesting system information. And may transmit information about a set transmission time to a plurality of groups. Hereinafter, an embodiment in which system information is transmitted at different transmission times in a method of transmitting a message including system information at different transmission times in the base station described with reference to FIG. 12 will be described in detail with reference to FIG. 13. have.

Referring to FIG. 13, a communication network according to another embodiment of the present invention may be the same as the communication network described with reference to FIG. 8. That is, the communication network according to another embodiment of the present invention may include a base station 610 for transmitting system information, a first group 620-1 including at least one terminal, and a second group 620-2. Can be. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to FIGS. 6 to 7. In addition, the second group 620-2 includes a fourth terminal 624, a fifth terminal 625, a sixth terminal 626, and a seventh terminal 627 described with reference to FIGS. 6 to 7. can do. Here, at least one terminal included in the first group 620-1 and at least one terminal included in the second group 620-2 have been described as being different from each other, but are not limited thereto. In other words, at least one terminal included in the first group 620-1 and at least one terminal included in the second group 620-2 may be identical to each other, or partially, as described with reference to FIG. 12. Only the terminal of may be the same.

That is, at least one terminal included in the first group 620-1 may have a state in which information about a first predetermined time point at which the request for the first system information is available may be obtained in advance, and the terminal requiring the first system information Can be. In addition, at least one terminal included in the second group 620-2 may have a state in which information about a second predetermined time point at which the request for the second system information is available may be obtained in advance, and the terminal requiring the second system information may be obtained. Can be.

First, the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 may include a first system at a first time point that is preset to request system information. A message requesting information may be generated, and a message requesting first system information may be transmitted to the base station 610. That is, the message for requesting the first system information is transmitted at the first predetermined time point, so that the first time point for requesting the system information is preset in the base station 610, and the base station 610 receives information about the preset first time point. It may mean that the state is obtained from.

Accordingly, the base station 610 may include a first terminal 621, a second terminal 622, and a third terminal included in the first group 620-1 at a first point in time at which the system information can be requested. 623, a message for requesting first system information may be received. Subsequently, the base station 610 may generate first system information at a time point at which the system information is transmitted, and includes a message including the generated first system information in the first group 620-1. The first terminal 621, the second terminal 622, and the third terminal 623 may be transmitted.

Through the above method, the base station 610 may include the fourth terminal 624, the fifth terminal 625, and the fourth terminal included in the second group 620-2 at a second time point that is preset to the time when the system information can be requested. The sixth terminal 626 and the seventh terminal 627 may receive a message for requesting the second system information, and the second group 620-2 included in the second group 620-2 at a point in time at which the system information is transmitted. A message including the second system information may be transmitted to the fourth terminal 624, the fifth terminal 625, the sixth terminal 626, and the seventh terminal 627.

In this case, at least one terminal included in the first group 620-1 and at least one terminal included in the second group 620-2 may request the first system information and the second system information. Since the viewpoints are different from each other, the RACH preamble which is a resource used for the request of the first system information and the RACH preamble that is a resource used for the request of the second system information may be the same. In addition, since the base station 610 is different from the time point at which the first system information is transmitted and the time point at which the second system information is transmitted, the identifier used for transmitting the first system information and the identifier used for transmitting the second system information are different. Can be set to be the same.

The methods according to the invention can be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like. The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention, or may be known and available to those skilled in computer software.

Examples of computer readable media include hardware devices that are specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims

A method of operating a base station for transmitting system information in a communication network,

Setting information on a request time of the system information and a transmission time of the system information in the communication network;

Transmitting a message including information on the set request time and the transmission time based on a broadcast method;

Receiving a message requesting the system information based on the request time from at least one terminal included in the communication network; And

And transmitting the message including the system information to the at least one terminal based on the transmission time.
The method according to claim 1,

The information on the request time,

And information about when the request for the system information is possible.
The method according to claim 2,

When the request for the system information is possible,

A method of operating a base station in a communication network, wherein the at least one terminal is one of a predetermined first time point for requesting the system information and a second time point that allows uplink transmission from the at least one terminal. .
The method according to claim 2,

The message for requesting the system information,

The method of operating a base station in a communication network, characterized in that received from the at least one terminal when the request for the system information.
The method according to claim 1,

The information on the transmission time,

And at least one of information on a time point at which the system information is transmitted from the base station and information on at least one time interval in which the system information is transmitted.
The method according to claim 5,

When the system information is transmitted,

And a first time point that is after a preset time from a time point at which the message for requesting the system information is received, and a second time point which is preset for periodically transmitting the system information by the base station. How it works.
The method according to claim 5,

The message containing the system information,

When transmitting in the at least one time interval, the method of operating a base station in a communication network, characterized in that the transmission based on a plurality of redundancy versions (redundancy versions) in the at least one time interval.
A method of operating a base station for transmitting system information in a communication network,

Receiving a message requesting the system information from a plurality of groups including at least one terminal in the communication network;

Setting a plurality of parameters for transmission of system information for each of the plurality of groups; And

And transmitting a message including system information about the plurality of groups based on the set plurality of parameters.
The method according to claim 8,

The message for requesting the system information,

Method for operating the base station, characterized in that transmitted for the request for the system information based on the RACH preamble which is a resource (resource) preset by the base station.
The method according to claim 8,

The plurality of parameters,

And a transmission time at which the system information is transmitted, and an identifier used for transmission of the system information.
The method according to claim 9,

The setting of the plurality of parameters may include:

The first system information and the transmission time and the identifier for the first system information for the first group included in the plurality of groups and the second system information for the second group included in the plurality of groups And setting the second system information to be distinguished.
The method according to claim 11,

The setting of the plurality of parameters may include:

When the transmission time of the first system information and the second system information is set to be the same, an identifier of each of the first system information and the second system information is differently set. Way.
The method according to claim 11,

The setting of the plurality of parameters may include:

When the transmission time of the first system information and the second system information is set differently, the identifiers of the first system information and the second system information are set to be identical to each other. How it works.
An operating method of a terminal for receiving system information in a communication network,

Receiving a message including information on a request time of the system information and a transmission time of the system information transmitted from a base station of the communication network;

Transmitting a message requesting the system information to the base station based on the request time; And

Receiving a message including the system information from the base station based on the transmission time.
The method according to claim 14,

The information on the request time,

Method for operating a terminal in a communication network, characterized in that it comprises information on the time when the request for the system information.
The method according to claim 15,

When the request for the system information is possible,

And a first time point set in advance for the request of the system information in the terminal and a second time point in which uplink transmission is possible in the terminal.
The method according to claim 14,

The information on the transmission time,

And at least one of information on a time point at which the system information is transmitted from the base station and information on at least one time interval in which the system information is transmitted.
The method according to claim 18,

When the system information is transmitted,

A communication network, wherein the message for requesting the system information is one of a first time point after a preset time from a time point at which the system information is received by the base station and a second time point preset for periodically transmitting the system information by the base station; Method of operation in the terminal.
The method according to claim 18

The message containing the system information,

And receiving the system information included in the information on the transmission time based on one of a time point at which the system information is transmitted and the at least one time interval.
The method according to claim 18,

The message containing the system information,

When received in the at least one time interval, the method of operating a terminal in a communication network, characterized in that received based on a plurality of redundant versions (redundancy versions) in the at least one time interval.