NZ750250B2 - Method for sending and receiving system message, base station, and user equipment - Google Patents

Abstract

The present application provides a method executed by a user equipment. The method comprises: receiving a first system information (SI) message, the first system information (SI) message comprising type information related to a system information block (SIB) and scheduling information of a second system information (SI) message of the type to which the SIB belongs, and the scheduling information comprising a time point on which the second SI message appears and indication information for indicating whether the second SI message is broadcast; and if the indication information indicates that the second SI message is not broadcast, sending an SI request message, and receiving the required system information block (SIB) according to the scheduling information in the received first SI message. The present application also provides a corresponding user equipment and a base station. By using the present invention, unnecessary overheads are avoided and system resources are saved while the demand of a UE for obtaining information is satisfied. stem information (SI) message of the type to which the SIB belongs, and the scheduling information comprising a time point on which the second SI message appears and indication information for indicating whether the second SI message is broadcast; and if the indication information indicates that the second SI message is not broadcast, sending an SI request message, and receiving the required system information block (SIB) according to the scheduling information in the received first SI message. The present application also provides a corresponding user equipment and a base station. By using the present invention, unnecessary overheads are avoided and system resources are saved while the demand of a UE for obtaining information is satisfied.

Description

METHOD FOR G AND RECEIVING SYSTEM MESSAGE, BASE STATION, AND USER EQUIPMENT cal Field The present invention relates to the field of wireless communications logy.

More specifically, the present invention relates to a method for sending and receiving a system message, and a corresponding base station and user equipment.

Background With the rapid growth of mobile communication and great progress of technology, the world will move toward a fully interconnected network society where anyone or ng can acquire information and share data anytime and re. It is estimated that there will be 50 billion interconnected equipment by 2020, of which only about 10 billion may be mobile phones and tablet computers. The rest are not machines communicating with human beings but machines communicating with one another.

Therefore, how to design a system to better support the Internet of Everything is a subject needing further and intensive study.

For this purpose, at the Third Generation Partnership Project (3GPP) RAN#64 plenary session held in March 2016, a research t on new 5G radio access technology was proposed (see non-patent literature: RP-160671 New SID Proposal: Study on New Radio Access Technology). In the description of the work item, the ing frequency band of future new communication RATs can be expanded to 100 GHz, which will satisfy at least service requirements for enhanced mobile broadband, the demand for communication n a large number of Internet of Things terminals, service requirements of high reliability requirements, and so on. The research work of the item is expected to end in 2018.

For better energy conservation and emission ion, the initial requirement of the item is to avoid the k repeatedly sending of unnecessary information. This requirement is based on the following consideration: In an existing LTE system, in order to ensure normal access of an LTE user equipment (UE), a base n (eNB) periodically broadcasts access stratum and nonaccess stratum information, which is collectively referred to as system information. In a current LTE system, system information is divided into one master system information block (MIB) and several system information blocks (SIBs) for carrying different content; the SIBs may have up to 20 types.

The MIB carries the necessary and most ntly sent parameters for acquiring basic information of a cell; and SIB1 includes scheduling information for other SIBs.

Thus, MIB and SIB1 are system information that the UE must receive. Other than MIB and SIB1, not all the other SIBs need to be broadcast. ing to the features supported 16R00759/US by a t access network device and the features of the non-access m, the eNB selects a system information block relevant to the features for broadcast. For example, if the current access k supports enhanced access control, the eNB broadcasts SIB14, which carries relevant information of EAB; otherwise, broadcasting is not performed. If the current access network supports a edia ast multicast service (MBMS), the eNB broadcasts SIB13 and so on. Such broadcast information is all reflected in the scheduling information carried by SIB1. Unscheduled SIBs are not broadcast.

The system information broadcast by the eNB is sent ically. Except that MIB and SIB1 are independently sent, SIBs having the same period are arranged in the same system information message and are sent periodically on fixed downlink resources.

Prior to initiating access, the UE further needs to obtain other SIBs based on its own features on to MIB and SIB1 that must be acquired, and then initiates access.

For e, if the UE supports multiple RATs, SIB8 further needs to be read to acquire inter-R AT-related cell reselection information; otherwise, SIB8 does not need to be read.

If the UE supports WLAN interoperation, SIB17 further needs to be acquired; otherwise, SIB17 does not need to be acquired. ic broadcasting of all system information supported by the eNB helps the UE to acquire the ponding information at any time. However, the system information needs to be continuously broadcast on specific downlink resources, resulting in low resource utilization and high energy consumption. To this end, the research on 5G technology hopes to avoid unnecessary overheads while meeting the demand of the UE acquiring specific system information.

Summary of Invention According to one aspect of the present application, a method executed by a user equipment is provided, sing: ing a first system information (SI) message, wherein the first system information (SI) message comprises type information related to a system information block (SIB) and scheduling information of a second system information (SI) message to which the type of the SIB belongs, and the ling information comprises a time when the second SI message appears and indication information indicating whether the second SI message is broadcast; and if the indication information indicates that the second SI message is not broadcast, sending an SI request message, and receiving a needed system information block (SIB) ing to the scheduling information in the received first SI message.

According to another aspect of the present application, a method ed by a base n is provided, comprising: having type information d to a system information block (SIB) and scheduling information of a second system information (SI) message to which the type of the SIB belongs comprised in a first SI message to be sent, wherein the scheduling information comprises a time when the second SI message 16R00759/US appears and indication information indicating whether the second SI message is broadcast; and if the indication ation tes that the second SI message is not broadcast, ing an SI request message and sending the second SI message at a specified scheduling time.

According to another aspect of the present application, a user equipment is provided, comprising: a first receiving unit, configured to receive a first system information (SI) message, wherein the first system information (SI) message comprises type information related to a system information block (SIB) and scheduling information of a second system information (SI) message to which the type of the SIB s, and the scheduling information comprises a time when the second SI message appears and indication information indicating whether the second SI message is broadcast; and a second receiving unit, configured to do the following: if the indication information indicates that the second SI message is not broadcast, send an SI request message, and receive a needed system ation block (SIB) according to the scheduling information in the received first SI message. ing to r aspect of the present application, a base station is provided, comprising: a generation unit, configured to do the following: have type information related to a system information block (SIB) and scheduling information of a second system information (SI) message to which the type of the SIB belongs comprised in a first SI message to be sent, n the scheduling information comprises a time when the second SI message appears and indication information indicating whether the second SI message is broadcast; and a sending unit, configured to do the following: if the indication information indicates that the second SI message is not broadcast, receive an SI request message and send the second SI message at a specified ling time.

By means of the present invention, unnecessary overheads are d and system resources are saved while meeting the demand of a UE acquiring specific system information.

Brief Description of Drawings The above and other es of the t application will become more apparent through the following detailed description made in conjunction with the anying drawings, where: is a block diagram of a base station according to an embodiment of the present application. is a block diagram of a user equipment ing to an embodiment of the present application. is a art of a method for sending system information according to an embodiment of the present application. 16R00759/US is a flowchart of a method for receiving system information according to an embodiment of the present application.

Detailed ption of Embodiments The principles and implementation of the present application will become nt below through the description of the specific ments of the present application made in conjunction with the accompanying drawings. It should be noted that the present application should not be limited to the specific embodiments described below. In addition, for simplicity, detailed ption of the prior art irrelevant to the present application is omitted. is a block diagram of a base station according to an embodiment of the t application. As shown in a base station 100 includes a generation unit 110 and a sending unit 120.

The tion unit 110 is configured to include type information related to a system information block (SIB) and ling information of a second system information (SI) e to which the type of the SIB belongs in a first SI message to be sent. The scheduling information may e a time when the second SI message appears and indication information indicating whether the second SI message is broadcast or not.

The sending unit 120 is configured to send the first SI message generated by the generation unit 110.

For example, the base station 100 may carry, in the system information needing to be frequently sent (for example, MIB or SIB1), a SIB type sent by the cell and scheduling information of an SI message to which the SIB type belongs. The scheduling information may include a time when the SI message appears. In addition, the ling information of each SI message further includes indication information to indicate whether the SI message is broadcast.

The indication information can be expressed in 1 bit. For example, when the indication ation is set to 0 (or 1), it ents that the corresponding SI message is broadcast (i.e., the SI message appearing in all scheduling times). On the ry, when the indication information is set to 1 (or 0), it represents that the corresponding SI message is not broadcast (i.e., the SI message not appearing in all scheduling times).

Alternatively, the indication information may also have an indication like the one described below: the eNB divides SI messages sent by the cell into two types: one type is to-be-broadcast SI messages, which always appear at a specified scheduling time; the other is SI messages that will not be broadcast, which do not always appear at all scheduling times.

Alternatively, the meaning of the SI messages that will not be broadcast in the indication ation may also be replaced with the following: SI messages that can be obtained only when request messages are sent. That is, if the indication information 59/US tes that the second SI e is not broadcast, an SI request message is received by base station first; and then, the generated first SI message is sent by base station at a specified scheduling time.

Alternatively, one SI message may carry one SIB or multiple SIBs. If the SI message carries only one SIB, the SI message can be seen as an equivalent to the SIB. is a block diagram of a user equipment according to an embodiment of the t application. As shown in a user equipment 200 includes a first ing unit 210 and a second receiving unit 220.

The first receiving unit 210 is configured to receive a first system information (SI) message. In this embodiment, the first system information (SI) message may include type information related to a system information block (SIB) and scheduling information of a second system information (SI) message to which the type of the SIB belongs. The scheduling information may e a time when the second SI message s and indication information indicating whether the second SI message is broadcast.

The second receiving unit 220 is configured to do the following: if the indication information indicates that the second SI message is already ast, e the needed system information block (SIB) according to the scheduling information in the received first SI message. For example, the second receiving unit 220 may receive the needed system information block (SIB) in any one of the following manners: (1) Calculate a location and on for the ance of the second SI message according to the scheduling information in the received first SI message. e data packets on a corresponding downlink channel in the duration. (2) Calculate an operation period of a receive timer according to the ling information in the received SI message. Receive data packets on a corresponding downlink channel in the operation period of the timer. (3) Start a receive timer according to pre-configured information. Receive data packets on a corresponding nk channel in the operation period of the timer according to the time indicated in the scheduling information.

Multiple scheduling times may appear in the operation period of the timer. If the UE does not receive the ted SIB (or SI message) at the first scheduling time, the UE may continue the receiving at the second scheduling time. The process continues until the SIB (or SI message) is correctly received. If the timer times out and the SIB is not yet correctly received, the UE can judge that the current link is abnormal; at this time, cell reselection or other mechanisms may need to be started.

Because the SIB to be received by the UE is included in the SI message, the UE may receive the full SI message and then retain the needed SIB and discard other unwanted SIBs in the case when the SI e carries multiple SIBs and the UE only needs to acquire one therefrom. Or, distribution regions for different SIBs may be pre- 59/US defined in the SI message, such that the UE can receive only the part including the SIB without receiving the full SI message.

The second receiving unit 220 may be further configured to do the following: if the indication information indicates that the second SI message is not broadcast, send an SI request e, and receive a needed system information block (SIB) ing to the scheduling information in the received first SI message.

In this embodiment, the SI t message may te a type for one or more requested SIBs. If the UE only needs to acquire one SIB, the SI t message can indicate a request for this type of SIB, or indicate a request for an SI message to which the requested type of SIB belongs. If the SIBs to be received by the UE have multiple types which are distributed in different SI messages, the SI request message sent by the UE can request one or more SIBs.

Alternatively, the second receiving unit 220 may be configured to send the SI request message once or more than one time. For example, if the UE needs to acquire SIBx and SIBy, and SIBx and SIBy are distributed in different SI es, the UE may send an SI request message once, requesting the base station to send SIBx and SIBy.

Then, the UE receives SIBx and SIBy at scheduling times of SI messages corresponding to SIBx and SIBy. Or, according to the sequence of the scheduling times for the appearance of SIBx and SIBy, the UE may first send SI request message to request the base station to send SIBx and then receive SIBx; next, the UE sends SI request message to request the base station to send SIBy and then receives SIBy.

Alternatively, the second receiving unit 220 may be configured to determine a time for sending the SI request message according to a time distance between a current time and an upcoming scheduling time of a target SIB. The time when the UE sends the SI request message can be ined using the following solution: the UE first ines the current time; and if a long period exists between the current time and the upcoming scheduling time of the target SIB; the latest that the UE can send the SI request message is some time before the scheduling time. For example, the latest can be the time at a length of n subframes before the scheduling time; the value of n can be defined according to the request processing delay of the base station. If the length is less than n subframes, the UE may attempt to perform reception at the scheduling time before sending the SI request message first. If the SIB is requested by other UEs prior to this, the UE is likely to receive the SIB. If the UE does not receive the SIB, the SI request message is sent before the next ling time arrives.

Alternatively, the second ing unit 220 may be configured to send the SI request message on a specified resource. This is because the time when the UE sends the SI request message may also be limited by the resources allowed to send the request message. The base station may y the resources (for example, ing time and frequency resources) for sending the SI request message. Accordingly, the latest that the 16R00759/US UE should send the request information is at the time of the available resource closest to the upcoming scheduling time.

After g the SI request message, the second receiving unit 220 may receive the needed system information block (SIB) in the following manner: (1) Calculate a location and/or duration for the appearance of the second SI e according to the scheduling information in the received first SI message.

Receive data packets in the appearing location and/or duration. (2) Calculate an operation period of a e timer according to the scheduling ation in the received SI message. Receive data packets on a corresponding downlink channel in the operation period of the timer. (3) Start a receive timer according to pre-configured ation. Receive data packets on a corresponding nk channel in the operation period of the timer according to the time indicated in the scheduling information.

Multiple ling times may appear in the operation period of the timer. If the UE does not receive the requested SIB (or SI message) at the first scheduling time, the UE may continue the receiving at the second scheduling time. The process continues until the SIB (or SI message) is tly received. If the timer times out and the ted system information is not yet tly received, the SI request message can be resent after the timer times out.

Because the SIB to be received by the UE is included in the SI message, the system information request message sent by the UE may be a request for the SIB or a request for the corresponding SI e. Accordingly, if the UE requests a SIB, the base station may send an SI message carrying only the SIB at a corresponding time or an SI e carrying the SIB and other SIBs included in the SI message. This is because other SIBs may be requested by other UEs. The UE may receive the full SI message and then retain the needed SIB and discard other unwanted SIBs in the case when the SI message carries multiple SIBs and the UE only needs to acquire one therefrom. Or, distribution regions for different SIBs may be pre-defined in the SI message. In this way, the UE can receive only the part including the SIB without receiving the full SI message.

By means of the aforementioned embodiments, unnecessary overheads are d and system resources are saved while meeting the demand of a UE acquiring information. is a flowchart of a method for sending system information ing to an embodiment of the present application. As shown in a method 300 starts at step S310.

At step S320, type information related to a system information block (SIB) and scheduling information of a second system information (SI) message to which the type of the SIB belongs are included in a first SI e to be sent. The scheduling information includes a time when the second SI message s and indication information indicating whether the second SI message is broadcast or not. 16R00759/US At step S330, if the indication information indicates that the second SI message is not broadcast, an SI request message is received, and the second SI message is sent at a specified scheduling time.

Then, the method 300 ends at step S340.

Preferably, when the indication information indicates that the SI message is broadcast, the SI message appears at all ling times. When the indication information indicates that the SI message is not ast, the SI message does not appear at all scheduling times. If the indication information indicates that the second SI message is not broadcast, an SI request message is received first by base station; and the system information block (SIB) is sent according to the scheduling information in the received first SI message by base station. is a flowchart of a method for receiving system ation according to an embodiment of the present ation. As shown in a method 400 starts at step S410.

At step S420, a first system information (SI) message is received. The first system information (SI) message includes type information related to a system information block (SIB) and ling information of a second system information (SI) message to which the type of the SIB s. The scheduling information includes a time when the second SI message appears and indication information indicating whether the second SI message is broadcast or not.

At step S430, it is judged whether the indication information indicates that the SI e is already broadcast. If the indication information indicates that the second SI message is y broadcast, the needed system information block (SIB) is received according to the scheduling information in the received SI message at step S440. Or, if the indication information indicates that the second SI message is not broadcast, an SI request e is sent first at step S450; and then, the required system ation block (SIB) is received according to the scheduling information in the received SI message.

Preferably, the ing the needed system information block (SIB) may include: calculating a location and/or duration for the appearance of the second SI message according to the scheduling information in the received first SI message. Data packets are received on a corresponding downlink channel in the duration.

Preferably, the receiving the required system information block (SIB) may e: calculating an operation period of a receive timer according to the ling ation in the ed first SI message. Data packets are received on a corresponding downlink channel in the operation period of the timer.

Preferably, the receiving the required system information block (SIB) may include: ng a receive timer according to pre-configured information. Data packets are 16R00759/US ed on a corresponding downlink channel in the operation period of the timer according to the time indicated in the scheduling information.

Preferably, the SI request message indicates a type of one or more requested SIBs.

In addition, the SI request message may be sent once or more than one time.

Preferably, a time for sending the SI request message may be determined according to a time distance between a current time and an upcoming ling time of a target SIB. Preferably, the SI request message may be sent on a specified resource.

Finally, the method 400 ends at step S460.

It should be understood that the above-described embodiments of the present application may be implemented through software, hardware, or a combination of software and hardware. For example, various components of the apparatus in the above embodiments can be implemented through multiple devices. These devices include, but are not limited to: an analog t, a digital circuit, a general-purpose processor, a digital signal processing (DSP) circuit, a programmable sor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a mmable logic device (CPLD), and the like.

In addition, the embodiments of the present application disclosed herein may be implemented on a computer m t. More specifically, the computer program product is a product provided with a er-readable medium having computer program logic encoded thereon. When being executed on a computing , the computer program logic provides related operations to implement the described technical solutions of the present ation. The computer program logic enables a processor to m the operations (methods) described in the embodiments of the present application when the product is executed on at least one processor of a computing system. Such an arrangement of the present application is typically provided as software, code, and/or other data structures that are configured or encoded on a computer-readable , such as an optical medium (for example, a CD-ROM), a floppy disk, or a hard disk, or other media such as firmware or microcode on one or more ROM or RAM or PROM chips, or downloadable re images, shared databases and so on in one or more s. Software or firmware or such configuration may be installed on a computing device such that one or more processors in the computing device perform the technical solutions described in the ments of the present application.

The program running on the device according to the present invention may be a program that enables the computer to ent the functions of the embodiments of the present invention by controlling the central processing unit (CPU). The program or information processed by the program can be stored temporarily in volatile memory (e.g., random access memory RAM), hard disk drive (HDD), non-volatile memory (e.g., flash memory), or other memory systems. 16R00759/US The program for implementing the functions of the embodiments of the present invention may be recorded on a computer-readable recording medium. The corresponding functions can be achieved by reading ms recorded on the recording medium and executing them by the computer system. The led "computer " may be a computer system embedded in the device, which may include operating systems or hardware (e.g., peripherals). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a time dynamic memory m, or any other recording medium readable by a computer.

Various features or functional modules of the device used in the above embodiments may be implemented or executed by circuits (e.g., monolithic or multi-chip integrated circuits). ts designed to execute the functions described in this description may include general-purpose processors, digital signal processors , application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or stor logic, or te hardware components, or any combination of the above. The general-purpose processor may be a microprocessor, or may be any existing processor, a ller, a microcontroller, or a state machine. The circuit may be a digital circuit or an analog t. When new integrated circuit technologies that replace existing integrated circuits emerge because of the advances in semiconductor technology, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.

Furthermore, the present invention is not d to the embodiments described above. Although various examples of the described embodiments have been described, the present ion is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning equipment, air ioner, office equipment, vending machines, and other household appliances, may be used as terminal devices or communications devices.

The embodiments of the present ion have been bed in detail above with reference to the accompanying drawings. However, the specific structures are not limited to the above embodiments, and the present invention also includes any design modifications that do not depart from the main idea of the present invention. In addition, various modifications can be made to the present invention within the scope of the claims, and embodiments resulting from the appropriate ation of the cal means disclosed in different embodiments are also included within the technical scope of the present invention. In addition, components with the same effect described in the above embodiments may be replaced with one another.

Claims Claim 1 A communication method performed by a terminal apparatus, the method comprising: receiving, from a base station apparatus, system information block (SIB) 1 including scheduling information, the scheduling information includes first information indicating a time when a system information (SI) e appears, and second ation indicating r the SI e is broadcasted or not, in a case that the SI message is indicated by the second information as broadcasting, receiving the SI message from the base station apparatus based on the first information, and in a case that the SI message is indicated by the second information as not broadcasting, transmitting a SI request message to the base station apparatus, and receiving the SI message from the base station apparatus based on the first information.

Claim 2 The communication method used for the terminal apparatus according to claim 1, wherein if the SI message is not received within a first ling time, repeating reception at a next scheduling time for the SI message.

Claim 3 The communication method used for the terminal apparatus according to claim 1, wherein transmitting the SI request message on a specific resource.

Claim 4 The communication method used for the terminal apparatus according to claim 1, wherein the SI request message includes information about the SI e for which the terminal apparatus requests.

Claim 5 A terminal apparatus comprising: a transmitter; and a receiver configured to receive, from a base station apparatus, system information block (SIB) 1 including scheduling information, the scheduling information includes first information indicating a time when a system information ( SI ) message appears, and second information indicating r the SI message is broadcasted or not, in a case that the SI message is indicated by the second ation as broadcasting, the receiver is configured to receive the SI message from the base station tus based on the first information, and in a case that the SI message is indicated by the second ation as not broadcasting, the transmitter is configured to transmit a SI request e to the base station apparatus, and the receiver is configured to receive the SI message from the base station apparatus based on the first information.

Claim 6 The terminal apparatus according to claim 11, wherein if the SI message is not received within a first scheduling time, the receiver is ured to repeat reception at a next scheduling time for the SI message.

Claim 7 The terminal apparatus ing to claim 5, wherein the transmitter is configured to transmit the SI request message on a specific resource.

Claim 8 The terminal tus according to claim 5, wherein the SI request e includes information about the SI message for which the terminal apparatus requests.

Claim 9 A communication method performed by a base station apparatus, the method comprising: transmitting, to a terminal apparatus, system information block (SIB) 1 including scheduling information , the scheduling information includes first information indicating a time when the a system information ( SI) message appears, and second information indicating whether the SI message is broadcasted or not, in a case that the SI message is indicated by the second information as broadcasting, transmitting the SI message to the terminal apparatus based on the first ation, and in a case that the SI message is indicated by the second information as not broadcasting, receiving a SI request message from the terminal apparatus, and transmitting the SI message to the terminal apparatus based on the first information.

Claim 10 The communication method used for the base station apparatus according to claim 9, wherein if the SI message is not transmitted within a first ling time, repeating transmission at a next scheduling time for the SI message.

Claim 11 The communication method used for the base station apparatus according to claim 9, n receiving the SI request message on a specific resource.

Claim 12 The communication method used for the base station apparatus according to claim 9, wherein the SI request message includes information about the SI message for which the terminal apparatus ts.

Claim 13 A base n apparatus sing: a receiver; and a transmitter configured to it, to a terminal apparatus, system information block (SIB) 1 including scheduling information, the scheduling information includes first information indicating a time when a system information (SI) e appears, and second ation indicating whether the SI message is broadcasted or not, in a case that the SI message is indicated by the second information as broadcasting, the transmitter is configured to transmit the SI message to the terminal apparatus based on the first information, and in a case that the SI message is indicated by the second information as not broadcasting, the receiver is configured to receive a SI request message from the terminal apparatus, and the transmitter is configured to transmit the SI message to the terminal apparatus based on the first information.

Claim 14 The base station apparatus according to claim 13, n if the SI message is not transmitted within a first ling time, the transmitter is configured to repeat transmission at a next scheduling time for the SI message.

Claim 15 The base station tus ing to claim 13, wherein the receiver is configured to receive the SI request message on a specific resource.

Claim 16 The base station apparatus according to claim 13, wherein the SI request message es information about the SI message for which the terminal apparatus requests.

Claim 17 A communication method according to claim 1, ntially as herein described or exemplified.

Claim 18 A terminal apparatus according to claim 5, substantially as herein bed or exemplified.

Claim 19.

A communication method according to claim 9, substantially as herein described or exemplified.

Claim 20.

A base station apparatus according to claim 13, substantially as herein described or exemplified. 59/US 59/US 59/US 59/US

Claims (20)

Claims

1. Claim 1 A communication method performed by a terminal apparatus, the method comprising: receiving, from a base station apparatus, system information block (SIB) 1 including scheduling information, the scheduling information includes first information indicating a time when a system information (SI) e appears, and second ation indicating r the SI e is broadcasted or not, in a case that the SI message is indicated by the second information as broadcasting, receiving the SI message from the base station apparatus based on the first information, and in a case that the SI message is indicated by the second information as not broadcasting, transmitting a SI request message to the base station apparatus, and receiving the SI message from the base station apparatus based on the first information.

2. Claim 2 The communication method used for the terminal apparatus according to claim 1, wherein if the SI message is not received within a first ling time, repeating reception at a next scheduling time for the SI message.

3. Claim 3 The communication method used for the terminal apparatus according to claim 1, wherein transmitting the SI request message on a specific resource.

4. Claim 4 The communication method used for the terminal apparatus according to claim 1, wherein the SI request message includes information about the SI e for which the terminal apparatus requests.

5. Claim 5 A terminal apparatus comprising: a transmitter; and a receiver configured to receive, from a base station apparatus, system information block (SIB) 1 including scheduling information, the scheduling information includes first information indicating a time when a system information ( SI ) message appears, and second information indicating r the SI message is broadcasted or not, in a case that the SI message is indicated by the second ation as broadcasting, the receiver is configured to receive the SI message from the base station tus based on the first information, and in a case that the SI message is indicated by the second ation as not broadcasting, the transmitter is configured to transmit a SI request e to the base station apparatus, and the receiver is configured to receive the SI message from the base station apparatus based on the first information.

6. Claim 6 The terminal apparatus according to claim 11, wherein if the SI message is not received within a first scheduling time, the receiver is ured to repeat reception at a next scheduling time for the SI message.

7. Claim 7 The terminal apparatus ing to claim 5, wherein the transmitter is configured to transmit the SI request message on a specific resource.

8. Claim 8 The terminal tus according to claim 5, wherein the SI request e includes information about the SI message for which the terminal apparatus requests.

9. Claim 9 A communication method performed by a base station apparatus, the method comprising: transmitting, to a terminal apparatus, system information block (SIB) 1 including scheduling information , the scheduling information includes first information indicating a time when the a system information ( SI) message appears, and second information indicating whether the SI message is broadcasted or not, in a case that the SI message is indicated by the second information as broadcasting, transmitting the SI message to the terminal apparatus based on the first ation, and in a case that the SI message is indicated by the second information as not broadcasting, receiving a SI request message from the terminal apparatus, and transmitting the SI message to the terminal apparatus based on the first information.

10. Claim 10 The communication method used for the base station apparatus according to claim 9, wherein if the SI message is not transmitted within a first ling time, repeating transmission at a next scheduling time for the SI message.

11. Claim 11 The communication method used for the base station apparatus according to claim 9, n receiving the SI request message on a specific resource.

12. Claim 12 The communication method used for the base station apparatus according to claim 9, wherein the SI request message includes information about the SI message for which the terminal apparatus ts.

13. Claim 13 A base n apparatus sing: a receiver; and a transmitter configured to it, to a terminal apparatus, system information block (SIB) 1 including scheduling information, the scheduling information includes first information indicating a time when a system information (SI) e appears, and second ation indicating whether the SI message is broadcasted or not, in a case that the SI message is indicated by the second information as broadcasting, the transmitter is configured to transmit the SI message to the terminal apparatus based on the first information, and in a case that the SI message is indicated by the second information as not broadcasting, the receiver is configured to receive a SI request message from the terminal apparatus, and the transmitter is configured to transmit the SI message to the terminal apparatus based on the first information.

14. Claim 14 The base station apparatus according to claim 13, n if the SI message is not transmitted within a first ling time, the transmitter is configured to repeat transmission at a next scheduling time for the SI message.

15. Claim 15 The base station tus ing to claim 13, wherein the receiver is configured to receive the SI request message on a specific resource.

16. Claim 16 The base station apparatus according to claim 13, wherein the SI request message es information about the SI message for which the terminal apparatus requests.

17. Claim 17 A communication method according to claim 1, ntially as herein described or exemplified.

18. Claim 18 A terminal apparatus according to claim 5, substantially as herein bed or exemplified.

19. Claim 19. A communication method according to claim 9, substantially as herein described or exemplified.

20. Claim 20. A base station apparatus according to claim 13, substantially as herein described or exemplified.