JP2015115829A - Base station device and method for controlling notification information transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a base station device in a mobile communication system to properly transmit emergency notification information even when there is conflict between the transmission of emergency notification information and update of normal notification information.SOLUTION: A base station device which transmits notification information to a user device, comprises: timing determination means which, on receiving an instruction to update notification information from the outside, determines update application timing on the basis of a transmission cycle of update notification information; and notification information update means which determines whether the update application timing is within a transmission period of emergency notification information that is instructed to be transmitted apart from the update instruction, and when the update application timing is not within the transmission period of emergency notification information, perform the update at the update application timing.

Description

  The present invention relates to a technique for transmitting broadcast information in a mobile communication system, and particularly relates to a technique for transmitting emergency broadcast information.

  In a mobile communication system that performs radio communication between a base station apparatus eNB and a user apparatus UE defined in 3GPP, information that needs to be acquired in common for all user apparatuses UE from the base station apparatus eNB to the user apparatus UE Broadcast information is being transmitted.

  The broadcast information is roughly classified into a master information block (MIB) and a system information block (SIB). The MIB includes basic information (system bandwidth, etc.) to be read first after the cell search by the user apparatus UE, and is transmitted by PBCH (Physical Broadcast Channel). The SIB is transmitted by PDSCH (Physical Downlink Shared Channel). The SIB includes SIB 1 to 11, and among the SIBs 1 to 11, SIBs 4 to 11 are transmitted as necessary, and need not be transmitted when unnecessary.

  SIB10 and SIB11 are SIBs for reporting signals from ETWS (Earthquake and Tsunami Warning System), and these are referred to as emergency notification information in this specification. Also, SIB4 to SIB9 are referred to as normal notification information.

  The SIB1 includes scheduling information (transmission period and the like) necessary for transmitting an SIB other than the SIB1 (received by the user apparatus UE). For MIB and SIB1, it is determined in advance in which cycle and in which subframe. The transmission period of SIBs after SIB2 can be set as appropriate.

  A plurality of SIBs subsequent to SIB2 are multiplexed and mapped onto a system information (SI) message and transmitted. The period of the SI message is, for example, 160 ms, 320 ms, 640 ms, etc. SIBs with the same transmission period can be mapped to the same SI message, but the amount of information that can be mapped to the SI message is limited and exceeds its length In this case, mapping is performed on other SI messages. The mapping information of each SIB to the SI message is notified to the user apparatus UE by SIB1.

  In addition, it is necessary to use an older SI message than the SI message used in the normal notification information for the emergency notification information. In this specification, the number of the SI message is the order of the entries in the SI message list in the schedulingInfoList. For example, the SI message number of the first entry (example: SIB2) is 1. In the following, when numbers are assigned to SI messages, they are represented as SI1, SI2, etc.

  For 3GPP standardization, in order for the user apparatus UE to receive broadcast information correctly, it is necessary to use consecutively-numbered SI messages. For example, in the SI message usage example of FIG. 1 (a), consecutive numbers of SI are used and are normal, but in the example of FIG. 1 (b), SI3 between SI2 and SI4 is unused. This is not a normal assignment. For example, Non-Patent Document 1 describes matters related to 3GPP broadcast information.

3GPP TS 36.331 V11.5.0 (2013-09) 5.2 System information

  The emergency notification information (SIB10 / SIB11) is transmitted by an earthquake early warning trigger issued from the Japan Meteorological Agency.

  In recent years, there has been a demand for transmitting emergency earthquake warnings as accurately and as quickly as possible in order to be wary of natural disasters and save lives. The 3GPP rules (3GPP TS 22.168) also specify that the trigger to UE arrival is within 4 [sec].

  On the other hand, the normal notification information (SIB4 to SIB9) is information transmitted by a telecommunications carrier matter, and the normal notification information to be transmitted may be changed during system operation. For example, it is conceivable to add / delete SIB5 / SIB6 by increasing the corresponding frequency band or winding the 3G system. It is desirable that such addition / deletion can be performed while the service is continued in consideration of the influence on the user.

  Since the update (addition / deletion) of the normal notification information and the transmission of the emergency notification information occur independently from each other, there may occur a case where these conflict with each other at the same timing. In such a case, there are concerns that SI messages to be used may not be continuous, and that SIBs with different periods may be transmitted in the same SI message. Then, for example, there is a possibility that the emergency notification information cannot be accurately transmitted to the user apparatus UE.

  The present invention has been made in view of the above points, and in a base station apparatus in a mobile communication system, even when emergency notification information transmission and normal notification information update compete, the emergency notification information is appropriately transmitted. The purpose is to provide a technology that makes it possible.

According to an embodiment of the present invention, a base station device that transmits broadcast information to a user device,
A timing determination means for determining an update reflection timing based on a transmission cycle of notification information to be updated when an instruction to update notification information is received from the outside;
It is determined whether or not the update reflection timing is within a transmission period of emergency notification information instructed to be transmitted separately from the update instruction, and the update reflection timing is determined when the update reflection timing is not within the transmission period of the emergency notification information. And a broadcast information update means for updating the base station apparatus.

Moreover, according to the embodiment of the present invention, a base station device that transmits broadcast information to a user device,
A plurality of broadcast information is used in the mobile communication system to which the base station apparatus belongs, and a plurality of messages associated with consecutive numbers can be used to transmit the plurality of broadcast information,
A timing determining means for determining a transmission start timing based on a transmission cycle of the emergency notification information when receiving an instruction to transmit emergency notification information from the outside;
As a message for transmitting the emergency notification information, it is determined to use a message of the number next to the largest number among the numbers of messages in use at the transmission start timing, and the emergency message is used to transmit the emergency notification information. There is provided a base station apparatus comprising notification information processing means for transmitting notification information.

Moreover, according to the embodiment of the present invention, a broadcast information transmission control method executed by a base station apparatus that transmits broadcast information to a user apparatus,
A timing determination step for determining an update reflection timing based on a transmission period of broadcast information to be updated when an update instruction for broadcast information is received from the outside;
It is determined whether or not the update reflection timing is within a transmission period of emergency notification information instructed to be transmitted separately from the update instruction, and the update reflection timing is determined when the update reflection timing is not within the transmission period of the emergency notification information. A broadcast information transmission control method comprising: a broadcast information update step for updating the broadcast information.

Moreover, according to the embodiment of the present invention, there is provided a notification information transmission control method to be executed while transmitting notification information to a user device,
A plurality of broadcast information is used in the mobile communication system to which the base station apparatus belongs, and a plurality of messages associated with consecutive numbers can be used to transmit the plurality of broadcast information,
A timing determination step of determining a transmission start timing based on a transmission cycle of the emergency notification information when receiving an instruction to transmit emergency notification information from the outside;
As a message for transmitting the emergency notification information, it is determined to use a message of the number next to the largest number among the numbers of messages in use at the transmission start timing, and the emergency message is used to transmit the emergency notification information. There is provided a broadcast information transmission control method characterized by comprising a broadcast information processing step for transmitting broadcast information.

  According to the embodiment of the present invention, in the base station apparatus in the mobile communication system, emergency notification information can be appropriately transmitted even when the transmission of emergency notification information competes with the update of normal notification information.

It is a figure which shows the example of the use condition of SI message. It is a figure which shows the structural example of the mobile communication system which concerns on embodiment of this invention. In a 1st example, it is a figure for demonstrating the example in case the emergency alert information transmission instruction is earlier than the normal alert information update (addition) instruction. In a 1st example, it is a figure for demonstrating the example when a normal alerting | reporting information update (addition) instruction | indication is earlier than an emergency alerting information transmission instruction | indication. In a 1st example, it is a figure for demonstrating the example in case the emergency alert information transmission instruction is earlier than the normal alert information update (deletion) instruction. In a 1st example, it is a figure for demonstrating the example when a normal alerting | reporting information update (deletion) instruction is earlier than an emergency alert information transmission instruction. In a 2nd example, it is a figure for demonstrating the example in case the emergency alert information transmission instruction is earlier than the normal alert information update (addition) instruction. In a 2nd example, it is a figure for demonstrating the example in case the emergency alert information transmission instruction is earlier than the normal alert information update (deletion) instruction. It is a functional block diagram of the base station apparatus eNB which concerns on embodiment of this invention. It is a flowchart of the process at the time of the normal notification information update instruction | indication reception in a 1st example. It is a flowchart of the process at the time of the emergency alert information transmission instruction | indication reception in a 1st example. It is a flowchart of the process at the time of normal notification information update instruction | indication or emergency notification information transmission instruction | indication reception in a 2nd example.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment. For example, the mobile communication system according to the present embodiment assumes a system based on LTE, but the present invention is not limited to LTE and can be applied to other systems. Moreover, although SIB1-SIB11 are shown as SIB, this is only an example and you may use another SIB.

  In the present specification and claims, “LTE” is used to mean including EPC for LTE, and not only a communication system corresponding to Release 8 or 9 of 3GPP but also Release 10, 11, or 12 of 3GPP. Alternatively, it is used in a broad sense including communication methods corresponding to the following.

(Overall configuration, content of processing)
FIG. 2 shows a configuration example of the mobile communication system according to the embodiment of the present invention. As shown in FIG. 2, the mobile communication system according to the present embodiment includes a base station apparatus eNB that forms a cell and a user apparatus UE that is located in the cell and performs radio communication with the base station apparatus eNB. Although one base station apparatus eNB and one user apparatus UE are shown in FIG. 2, these are representative and may be plural. The base station apparatus eNB is connected to the MME in the core network and the operation system.

  Hereinafter, an example of processing executed by the base station apparatus eNB in the present embodiment will be described with reference to the drawings.

<First example>
In the first example, when the base station apparatus eNB receives the emergency notification information transmission instruction from the MME and further receives the normal notification information update instruction from the operation system, the emergency notification information transmission start timing is the original normal notification. If it is earlier than the information update timing (for example, transmission start timing if it is added), the normal notification information update is waited until the emergency notification information transmission is completed, and the normal notification information update is completed after the emergency notification information transmission is completed. I do.

  In the present embodiment, it is assumed that the transmission start timing, update timing, and the like are timings for updating SIB1 (may be regarded as timing for starting transmission of updated SIB1). According to the timing information (scheduling information) indicated in the updated SIB1, the emergency notification information and the updated normal notification information are transmitted, and the user apparatus UE receives them. In the following example, the SI message is added / deleted when the normal broadcast information is updated (added / deleted). However, this is an example. Can be used without adding an SI message.

  When the base station apparatus eNB receives the emergency notification information transmission instruction from the MME and further receives the normal notification information update instruction from the operation system, when the normal notification information update timing is earlier than the emergency notification information transmission start timing, The SI message for transmitting the emergency notification information is determined according to the SI message used for the updated normal notification information.

  FIG. 3 illustrates an example of processing viewed on the time axis when the emergency notification information transmission instruction is earlier than the normal notification information update (addition) instruction. In the following example, it is assumed that an SIB10 and SIB11 transmission instruction is received as an emergency notification information transmission instruction, and an instruction to add one SIB is received as a normal notification information update instruction. The instruction includes a transmission cycle for each SIB. The emergency notification information transmission instruction includes a transmission period. Note that the transmission period may not be included in the instruction if it is determined in advance.

  In the example of FIG. 3, the base station apparatus eNB receives the emergency broadcast information transmission instruction at time T1, determines the transmission start timing (≈SIB1 update timing) based on the transmission cycle included in the instruction, and is in use The SI message to be used for emergency notification information transmission is determined based on the SI message. Here, emergency notification information transmission is started at time T3. In addition, SI1, SI2, and SI3 are used at the start point of T1, and SI4 and SI5 are additionally used for transmitting emergency notification information after T3.

  On the other hand, the base station apparatus eNB receives the normal broadcast information update instruction at time T2, and determines the transmission start timing as T4 based on the transmission period included in the normal broadcast information update instruction. However, as shown in FIG. 3, the time point T4 is within the emergency notification information transmission period. Therefore, the base station apparatus eNB does not start transmission at time T4, waits for transmission until the emergency notification information transmission period ends, and starts transmission at time T6 after the end of the emergency notification information transmission period (T5). .

  Since the emergency notification information transmission ends at time T5, the in-use SI becomes SI1, SI2, and SI3 after that, and SI4 is added from T6.

  FIG. 4 illustrates an example of processing viewed on the time axis when the normal notification information update (addition) instruction is earlier than the emergency notification information transmission instruction.

  In the example of FIG. 4, the base station apparatus eNB receives the normal broadcast information update instruction at time T1, determines the transmission start timing based on the SIB transmission period included in the instruction, and sets the SI message in use to Based on this, the SI message used for normal broadcast information transmission is determined. Here, since emergency notification information transmission is not performed at time T3, normal notification information transmission is started at this point. Moreover, SI1, SI2, and SI3 are used at the time point T1, and SI4 is additionally used for transmission of the added normal broadcast information after T3.

  On the other hand, the base station apparatus eNB receives the emergency notification information transmission instruction at time T2, and determines the transmission start timing as T4 based on the transmission cycle included in the emergency notification information transmission instruction. In addition, since SI1 to SI4 are used before T4, it is determined that SI5 and SI6 subsequent to SI4 are used for emergency notification information transmission, and based on the determination, emergency is started from T4. Broadcast information transmission is started. Emergency notification information transmission ends at time T5, and thereafter, normal notification information is transmitted using SI1 to SI4, as before T4.

  In the above, an example of addition as normal notification information update has been shown, but the case of deletion is as follows.

  FIG. 5 illustrates an example of processing viewed on the time axis when the emergency notification information transmission instruction is earlier than the normal notification information update (deletion) instruction.

  In the example of FIG. 5, the base station apparatus eNB receives the emergency notification information transmission instruction at time T1, determines the transmission start timing based on the transmission cycle included in the instruction, and based on the SI message in use The SI message used for emergency information transmission is determined. Based on the determination, emergency notification information transmission is started at time T3. Moreover, SI1, SI2, and SI3 are used at the time point T1, and SI4 and SI5 are additionally used for transmitting emergency notification information after T3.

  On the other hand, the base station apparatus eNB receives the normal broadcast information update (deletion) instruction at time T2, and determines the deletion reflection timing as T4 based on the transmission cycle of the deletion target SIB included in the normal broadcast information update instruction. However, as shown in FIG. 5, the time point T4 is within the emergency notification information transmission period. Accordingly, the base station apparatus eNB does not reflect the deletion at the time T4, waits for the update until the emergency notification information transmission period ends, and performs the deletion at the time T6 after the end of the emergency notification information transmission period (T5).

  Since the emergency notification information transmission ends at time T5, the in-use SI becomes SI1, SI2, and SI3 after that, and SI3 is deleted from time T6.

  FIG. 6 illustrates an example of processing viewed on the time axis when the normal notification information update (deletion) instruction is earlier than the emergency notification information transmission instruction.

  In the example of FIG. 6, the base station apparatus eNB receives the normal broadcast information update instruction at time T1, determines the deletion reflection timing based on the transmission cycle of the deletion target SIB included in the instruction, and uses the SI in use. Based on the message, an SI message to be used for transmitting the updated normal broadcast information is determined. Here, since emergency notification information is not transmitted at time T3, normal notification information update (deletion) is reflected at this point. Further, SI1, SI2, and SI3 are used at time T1, and SI3 is deleted and not used after T3.

  On the other hand, the base station apparatus eNB receives the emergency notification information transmission instruction at time T2, and determines the transmission start timing as T4 based on the transmission cycle included in the emergency notification information transmission instruction. In addition, since SI1 to SI2 are used before T4, it is determined that SI3 and SI4 following SI2 are used for emergency notification information transmission, and based on the determination, emergency is started from T4. Broadcast information transmission is started. At time T5, the emergency notification information transmission ends, and thereafter, the normal notification information is transmitted using SI1 to SI2 in the same manner as before T4.

  As described above, in the first example, emergency notification information transmission has priority over normal notification information update, and when the normal notification information update timing is in the emergency notification information transmission period, the normal notification information update is postponed. did. This makes it possible to reliably transmit the emergency notification information without delaying the transmission of the emergency notification information by updating the normal notification information.

  In the case where the emergency notification information transmission timing arrives after the normal notification information update timing, the SI message used for emergency notification information transmission is determined according to the usage status of the updated SI message, so the same SI Duplication of messages can be avoided, and emergency notification information can be reliably transmitted to the user apparatus UE.

<Second example>
In the second example, when the base station apparatus eNB receives the emergency notification information transmission instruction from the MME and further receives the normal notification information update instruction from the operation system, each of the base station apparatuses eNB is based on the transmission cycle indicated by each instruction. Transmission / update reflection timing is determined, and an SI message to be used for transmission of each SIB is determined at any time according to an SI message being used at the reflection timing. At the time of determination, as in the other examples, the determination is made so as to satisfy the constraints such that the SI number is not selected or duplicated.

  FIG. 7 illustrates an example of processing viewed on the time axis when the emergency notification information transmission instruction is earlier than the normal notification information update (addition) instruction.

  In the example of FIG. 7, the base station apparatus eNB receives the emergency notification information transmission instruction at time T1, determines the transmission start timing based on the transmission cycle included in the instruction, and based on the SI message in use The SI message used for emergency information transmission is determined. Here, it is determined to start emergency notification information transmission at time T3. Moreover, SI1, SI2, and SI3 are used at the time point T1, and SI4 and SI5 are additionally used for transmitting emergency notification information after T3.

  On the other hand, the base station apparatus eNB receives the normal broadcast information update instruction at time T2, and determines the transmission start timing as T4 based on the SIB transmission cycle included in the normal broadcast information update instruction. Here, SI1 to SI5 are used immediately before T4, and SI4 and SI5 are used for emergency notification information transmission. The base station apparatus eNB determines to add an SI message for additional normal broadcast information transmission, and the SI message used for emergency broadcast information transmission is older than the SI message used for normal broadcast information transmission. Therefore, SI4 is added as an additional SI message, and SI used for emergency notification information transmission is changed from SI4, SI5 to SI5, SI6.

  Since the emergency notification information transmission ends at time T5, the SI messages to be used are SI1 to SI4 thereafter.

  When the normal notification information update instruction is earlier than the emergency notification information transmission instruction, the same processing as in FIG. 4 is performed as an example. However, in the second example, it is not determined whether it is within the emergency notification information transmission period at the normal notification information update timing.

  In the above, an example of addition as normal notification information update has been shown, but the case of deletion is as follows.

  FIG. 8 illustrates an example of processing viewed on the time axis when the emergency notification information transmission instruction is earlier than the normal notification information update (deletion) instruction.

  In the example of FIG. 8, the base station apparatus eNB receives the emergency notification information transmission instruction at time T1, determines the transmission start timing based on the transmission cycle included in the instruction, and based on the SI message in use The SI message used for emergency information transmission is determined. Here, it is determined to start emergency notification information transmission at time T3. Moreover, SI1, SI2, and SI3 are used at the time point T1, and SI4 and SI5 are additionally used for transmitting emergency notification information after T3.

  On the other hand, the base station apparatus eNB receives the normal broadcast information update (deletion) instruction at time T2, and determines the deletion reflection timing as T4 based on the transmission cycle of the deletion target SIB included in the normal broadcast information update instruction. Here, SI1 to SI5 are used immediately before T4, and SI4 and SI5 are used for emergency notification information transmission. The base station apparatus eNB judges to delete the SI message for normal broadcast information update. Since the SI message used for emergency notification information transmission needs to be older than the SI message used for normal notification information transmission, SI3 is deleted, and SI messages used for emergency notification information transmission are SI4, SI5. To SI3 and SI4.

  Since the emergency notification information transmission ends at time T5, the SI messages to be used are SI1 to SI2.

  When the normal notification information update instruction is earlier than the emergency notification information transmission instruction, the same processing as in FIG. 7 is performed as an example. However, in the second example, it is not determined whether it is within the emergency notification information transmission period at the normal notification information update timing.

  Also in the second example, it is possible to avoid duplication of identical SI and use SI, and it is possible to reliably transmit emergency notification information to the user apparatus UE. Further, in the second example, the normal notification information update is not waited, so that the normal notification information update can be quickly reflected even when the emergency notification information is transmitted.

(Device configuration example)
FIG. 9 shows a functional configuration diagram as an example of the base station apparatus eNB according to the present embodiment. The base station apparatus eNB illustrated in FIG. 9 includes an antenna 10 that transmits and receives radio signals, a signal transmission / reception function unit 11 that is connected to the antenna, a baseband function unit 12, a control function unit 13, an MME, and an external system that is connected to the operation system. A device signal transmission / reception function unit 14.

  The signal transmission / reception function unit 11 transmits / receives a radio signal to / from the user apparatus UE. The external device signal transmission / reception function unit 14 transmits / receives a signal to / from an external device. In particular, in this embodiment, the emergency notification information transmission instruction is received from the MME, and the normal notification information update instruction is received from the operation system.

  The baseband function unit 12 mainly performs layer 1 and layer 2 processing. That is, the baseband function unit 12 performs processing of the physical layer, the MAC layer, the RLC layer, and the PDCP layer. The baseband function unit 12 is realized by, for example, a DSP (Digital Signal Processor), but is not limited thereto. The control function unit 13 performs layer 3 or higher processing such as call connection control and monitoring control, a control instruction to each functional unit, and processing determination. The control function unit 13 is configured by, for example, a computer including a CPU and a memory, but is not limited thereto. In addition, each of the baseband function unit 12 and the control function unit 13 can be configured by a computer including a CPU and a memory. Furthermore, the baseband function unit 12 and the control function unit 13 can be collectively configured by a computer including a CPU and a memory.

  In the first example described above in the present embodiment, the control function unit 13 is used for instructing the baseband function unit 12 of the broadcast information to be transmitted (message content, period, etc.), determining the presence / absence of competition, and transmitting the broadcast information. SI message determination / instruction to be performed, normal notification information update waiting determination, and the like are performed. In the first example, the baseband function unit 12 performs broadcast information transmission setting / transmission processing, update of setting information in the SIB1, and the like.

  In the second example, the control function unit 13 instructs the baseband function unit 12 of broadcast information to be transmitted (message content, period, etc.). Further, in the second example, the baseband function unit 12 performs broadcast information transmission setting / transmission processing, determination / change of SI message used for broadcast information transmission, update of setting information in SIB1, and the like.

(Processing flow)
FIGS. 10 and 11 show flowcharts of processing executed by the base station apparatus eNB shown in FIG. 9 in the first example. An example of operation in the first example will be described with reference to FIGS.

  First, with reference to FIG. 10, an operation when a normal broadcast information update instruction is received will be described.

  When the base station apparatus eNB receives the normal broadcast information update instruction (step 100), the control function unit 13 calculates the reflection timing of the normal broadcast information update (step 101). For example, if the maximum value of the SIB transmission cycle designated for updating (the transmission cycle of one SIB when there is one updated SIB) is SI-Periodicity_max, SFN (SFN mod SI-Periodicity_max = 0) System frame number) is determined as the reflection timing.

  The control function unit 13 determines whether or not the reflection timing calculated in step 101 is within the period from the start of emergency notification information transmission to the completion of transmission (step 102). If the determination in step 102 is Yes, one reflection timing is skipped, the next SFN in which SFN mod SI-Periodicity_max = 0 is set as the reflection timing (step 103), and the process proceeds to step 102.

  If No in Step 102, the control function unit 13 determines an SI message for mapping the normal broadcast information and notifies the baseband function unit 12 of the mapping information (Step 104). Here, SIBs with the same transmission period can be mapped to the same SI message, but based on the restriction that there is a limit to the amount of information that can be mapped to the SI message, an SI message that is already in use or an SI message can be used. Decide whether to add / delete. In addition, when adding / deleting, the SI message is determined so that the SI number does not fall out. Note that the control function unit 13 holds SI and SIB information currently in use in a memory or the like, and makes a determination by referring to the information in the memory.

  Next, the baseband function part 12 produces | generates the updated SIB1 information according to the mapping information to the SI message of SIB (step 105).

  In addition, since an emergency notification information transmission instruction is received during processing and the already determined reflection timing may correspond to a timing within the emergency notification information transmission period, the update is performed in step 106 as in step 102. It is determined whether the reflection timing is within the period from the start of emergency notification information transmission to the completion of transmission. If Yes, the process returns to Step 103. If it is No, it will progress to step 107 and the baseband function part 12 will update SIB1 at a reflection timing, and will transmit normal alerting | reporting information according to designation | designated of SIB1.

  Next, with reference to FIG. 11, operation | movement of the base station apparatus eNB at the time of emergency notification information transmission instruction | indication reception is demonstrated.

  When the base station apparatus eNB receives the emergency notification information transmission instruction (step 200), the control function unit 13 calculates the reflection (transmission) timing of the emergency notification information (step 201). The timing calculation method is as described in step 101 of FIG.

Next, the control function unit 13 determines an SI message for mapping emergency notification information, and notifies the baseband function unit 12 of the mapping information (step 202). Here, it is decided to use +1 and +2 SI (assuming two SIB10 and _SIB11 ) for the maximum SI number ( _{SI_Normal_max} ) currently used for normal broadcast information transmission, and The function unit 12 is instructed.

  Next, the baseband function part 12 produces | generates the updated SIB1 information according to the mapping information to the SI message of SIB (step 203). Then, the baseband function unit 12 updates SIB1 at the reflection timing, and transmits emergency notification information according to the designation of SIB1 (step 204).

  FIG. 12 shows a flowchart of processing executed by the base station apparatus eNB shown in FIG. 9 in the second example. With reference to FIG. 12, the operation example in a 2nd example is demonstrated.

  First, the base station apparatus eNB receives an instruction (a normal broadcast information update instruction or an emergency broadcast information transmission instruction) (step 300).

  In the second example, the baseband function unit 12 calculates instruction reflection timing (step 301). For example, if the maximum value of the transmission cycle of the SIB designated to be updated / transmitted (the one transmission cycle if there is one) is SI-Periodicity_max, SFN (system frame number where SFN mod SI-Periodicity_max = 0) ) Is determined as the reflection timing.

  If the instruction is a normal notification information update instruction, the process proceeds to step 303, and if the instruction is an emergency notification information transmission instruction, the process proceeds to step 304 (step 302).

  In step 303 (in the case of a normal broadcast information update instruction), the baseband function unit 12 determines an SI message for mapping the normal broadcast information (SIB). Here, SIBs with the same transmission period can be mapped to the same SI message, but based on the restriction that there is a limit to the amount of information that can be mapped to the SI message, an SI message that is already in use or an SI message can be used. Decide whether to add / delete. In addition, when adding / deleting, the SI message is determined so that the SI number does not fall out. It is assumed that the baseband function unit 12 holds information on SI and SIB currently in use in a memory or the like. Alternatively, these pieces of information may be acquired from the control function unit 13.

In step 304 (in the case of an emergency notification information transmission instruction), the baseband function unit 12 determines an SI message to map the emergency notification information. Here, it is determined to use +1 and +2 SI (assuming two SIB10 and _SIB11 ) with respect to the maximum SI number ( _{SI_Normal_max} ) currently used in normal broadcast information transmission.

  Next, the baseband function part 12 produces | generates the updated SIB1 information according to the mapping information to the SI message of SIB (step 305). Subsequently, the baseband function unit 12 updates SIB1 at the reflection timing, and performs transmission of normal notification information / emergency notification information according to the designation of SIB1 (step 306).

  In addition, the process division in the control function part 13 and the baseband function part 12 is only an example, and if the process content demonstrated in this Embodiment including a 1st example and a 2nd example is realizable, There is no limitation on which function unit performs which process. Also, the device configuration divided into the baseband function unit 12 and the control function unit 13 is merely an example. The base station apparatus eNB may have any functional configuration as long as the process according to the present embodiment can be realized as the base station apparatus eNB.

(Summary of the embodiment, effects, etc.)
As described above, in the present embodiment, the base station device that transmits the broadcast information to the user apparatus, and when the broadcast information update instruction is received from the outside, the transmission period of the broadcast information to be updated is set. Timing determination means (for example, the control function unit 12 or the baseband function unit 13) that determines the update reflection timing based on the transmission period of the emergency notification information in which the update reflection timing is instructed to be transmitted separately from the update instruction A notification information updating means (e.g., the control function unit 12 or the baseband function unit 13) that updates at the update reflection timing when it is not within the transmission period of the emergency notification information. A base station apparatus is provided. Even when the transmission of emergency notification information and the update of normal notification information compete with each other, the base station device can appropriately transmit emergency notification information.

  When the update reflection timing is within the transmission period of the emergency notification information, the notification information update unit does not update the update reflection timing, and sets a timing after the update reflection timing as a new update reflection timing. And The emergency notification information can be reliably transmitted by deferring the update reflection timing of the notification information to be updated (added or deleted).

  In the present embodiment, a plurality of broadcast information is used in the mobile communication system to which the base station apparatus belongs, and a plurality of messages associated with consecutive numbers can be used to transmit the plurality of broadcast information. When the base station apparatus receives an instruction to transmit emergency notification information from the outside, the timing determination unit determines a transmission start timing based on a transmission period of the emergency notification information, and the notification information update unit Then, as a message for transmitting the emergency notification information, it is determined to use a message of the number next to the largest number among the numbers of messages in use at the transmission start timing. With this configuration, emergency notification information can be transmitted according to a predetermined rule (3GPP standard or the like), and the user apparatus can reliably receive emergency notification information.

  Further, in the present embodiment, a plurality of pieces of broadcast information are used in the mobile communication system to which the base station apparatus belongs, and the broadcast information update unit includes a transmission schedule of other pieces of broadcast information among the plurality of pieces of broadcast information. The transmission schedule information in the notification information (eg, SIB1) for notifying the user apparatus of information (transmission cycle, used SI, etc.) is updated at the update reflection timing. By updating the transmission schedule information, the user apparatus can reliably receive the notification information.

  Moreover, in this Embodiment, it is a base station apparatus which transmits alerting | reporting information to a user apparatus, Comprising: In order to transmit the said alerting | reporting information by using several alerting | reporting information in the mobile communication system to which the said base station apparatus belongs In addition, when a plurality of messages associated with consecutive numbers can be used and a transmission instruction for emergency notification information is received from the outside, timing determination for determining a transmission start timing based on a transmission cycle of the emergency notification information As a message for transmitting the means (for example, the control function unit 12 or the baseband function unit 13) and the emergency notification information, the number next to the largest number among the numbers of messages in use at the transmission start timing Notification information processing means (for example, for transmitting the emergency notification information using the message) Control function unit 12 or baseband function unit 13, etc.) and the base station apparatus equipped with is provided. With this configuration, even when the transmission of emergency notification information and the update of normal notification information compete, it is possible to appropriately transmit emergency notification information.

  Further, when the base station apparatus receives an instruction to update broadcast information from the outside, the timing determination means determines an update reflection timing based on a transmission cycle of the broadcast information, and the broadcast information processing means The message for transmitting the broadcast information is a message having a number smaller than the number of the message used for the emergency broadcast information transmission at the update reflection timing, and a number that is continuous with the number of the message being used. It is decided to use a message, and the broadcast information is transmitted using the message. With this configuration, even when the transmission of the emergency notification information and the update of the normal notification information compete, the emergency notification information can be appropriately transmitted and the normal notification information can be appropriately transmitted.

  Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. Will. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may be applied to the matters described in (if not inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. For convenience of explanation, the base station apparatus has been described using a functional block diagram, but such an apparatus may be realized by hardware, software, or a combination thereof. Software that executes an operation corresponding to the processing described in the embodiment of the present invention (executed by a processor included in the base station apparatus) is a random access memory (RAM), a flash memory, a read-only memory (ROM), or an EPROM. , EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium. The present invention is not limited to the above embodiments, and various modifications, modifications, alternatives, substitutions, and the like are included in the present invention without departing from the spirit of the present invention.

UE user apparatus eNB base station apparatus 10 antenna 11 signal transmission / reception function part 12 baseband function part 13 control function part 14 external device signal transmission / reception function part

Claims (8)

A base station device that transmits broadcast information to a user device,
A timing determination means for determining an update reflection timing based on a transmission cycle of notification information to be updated when an instruction to update notification information is received from the outside;
It is determined whether or not the update reflection timing is within a transmission period of emergency notification information instructed to be transmitted separately from the update instruction, and the update reflection timing is determined when the update reflection timing is not within the transmission period of the emergency notification information. A base station apparatus comprising: broadcast information updating means for updating the information. When the update reflection timing is within the transmission period of the emergency notification information, the notification information update unit does not update the update reflection timing, and sets a timing after the update reflection timing as a new update reflection timing. The base station apparatus according to claim 1, wherein: A plurality of broadcast information is used in the mobile communication system to which the base station apparatus belongs, and a plurality of messages associated with consecutive numbers can be used to transmit the plurality of broadcast information,
When the base station apparatus receives an instruction to transmit emergency notification information from the outside, the timing determination means determines a transmission start timing based on a transmission period of the emergency notification information,
The broadcast information update means determines to use a message of the number next to the largest number among the message numbers in use at the transmission start timing as a message for transmitting the emergency broadcast information. The base station apparatus according to claim 1 or 2, characterized in that A plurality of pieces of broadcast information are used in the mobile communication system to which the base station apparatus belongs, and the broadcast information update unit notifies the user apparatus of transmission schedule information of other broadcast information among the pieces of broadcast information. The base station apparatus according to claim 1 or 2, wherein the transmission schedule information in the broadcast information is updated at the update reflection timing. A base station device that transmits broadcast information to a user device,
A plurality of broadcast information is used in the mobile communication system to which the base station apparatus belongs, and a plurality of messages associated with consecutive numbers can be used to transmit the plurality of broadcast information,
A timing determining means for determining a transmission start timing based on a transmission cycle of the emergency notification information when receiving an instruction to transmit emergency notification information from the outside;
As a message for transmitting the emergency notification information, it is determined to use a message of the number next to the largest number among the numbers of messages in use at the transmission start timing, and the emergency message is used to transmit the emergency notification information. A base station apparatus comprising: broadcast information processing means for transmitting broadcast information. When the base station apparatus receives a broadcast information update instruction from the outside, the timing determination means determines an update reflection timing based on a transmission cycle of the broadcast information,
The notification information processing means is a message having a number smaller than the number of a message used for emergency notification information transmission at the update reflection timing as a message for transmitting the notification information, The base station apparatus according to claim 5, wherein it is determined to use a message having a number that is continuous with a message number, and the broadcast information is transmitted using the message. A broadcast information transmission control method executed by a base station device that transmits broadcast information to a user apparatus,
A timing determination step for determining an update reflection timing based on a transmission period of broadcast information to be updated when an update instruction for broadcast information is received from the outside;
It is determined whether or not the update reflection timing is within a transmission period of emergency notification information instructed to be transmitted separately from the update instruction, and the update reflection timing is determined when the update reflection timing is not within the transmission period of the emergency notification information. A broadcast information transmission control method comprising: a broadcast information update step for updating the broadcast information. A broadcast information transmission control method to be executed while transmitting broadcast information to a user device,
A plurality of broadcast information is used in the mobile communication system to which the base station apparatus belongs, and a plurality of messages associated with consecutive numbers can be used to transmit the plurality of broadcast information,
A timing determination step of determining a transmission start timing based on a transmission cycle of the emergency notification information when receiving an instruction to transmit emergency notification information from the outside;
As a message for transmitting the emergency notification information, it is determined to use a message of the number next to the largest number among the numbers of messages in use at the transmission start timing, and the emergency message is used to transmit the emergency notification information. A broadcast information transmission control method comprising: a broadcast information processing step for transmitting broadcast information.