WO2001020849A1 - Download method, and transmission-side device and reception-side device applied thereto - Google Patents

Abstract

A transmission-side device broadcasts a download start telegram containing object device designating information and a broadcast identifier to all the reception-side devices and then a data telegram containing the same broadcast identifier contained in the start telegram and data to all the reception-side devices. Each reception-side device stores the broadcast identifier in the download start telegram when the attribute information of itself satisfies the object device designating information contained in the download start telegram, and then fetches the data in the data telegram when the broadcast identifier in the data telegram coincides with the broadcast identifier stored in itself. Therefore, no troublesome operation is required in advance for designating which reception-side device receives which data. Since the telegram containing information for designating an object device and the telegram for data transmission are separately used, it is unnecessary to set update information in the data transmission telegram, thereby improving the data transmission efficiency. Further since the telegram containing the information for designating an object device and the data transmission telegram are broadcast, the data can be downloaded in a short time.

Description

 TECHNICAL FIELD The present invention relates to a down-loading method and a transmitting device applied thereto and a receiving device.

 The present invention relates to a download method and a transmitting device and a receiving device applied thereto, and a method of downloading data from a transmitting device to a plurality of receiving devices connected to the transmitting device, and a transmission applied to the method. It relates to the receiving device and the receiving device. Background art

 2. Description of the Related Art In recent years, for the purpose of broadening the bandwidth of an access network in a public network, an ATM (Positive Synchronous Transfer Moe-Passive Opt iCa ltNetwork) technology has been used. In this ATM-PON, a maximum of 64 subscriber line termination devices are connected to one fiber end device. In addition, international standardization of protocols by ITU-T (International Telecommunication Union, Telecommunication Standardization Sector) is being carried out, and it is expected that equipment will be difficult for various vendors in the future.

 By the way, the subscriber line terminating equipment connected to one line terminating equipment, if the manufacturer is different, operates differently even if the program that runs it is different, or even if the equipment has the same manufacturer. The version of the program to be used may be different.

 On the other hand, in order to improve the program of the subscriber line termination equipment and add functions, it is necessary to update the program, but it is not necessary to do it manually for each unit. For this purpose, a function to download update data from the line termination equipment to the target subscriber line termination equipment is required. In this case, instead of downloading to all the subscriber line termination devices uniformly, there is a 'download only to the subscriber line termination device that satisfies the conditions'.

The following methods are conventionally known as such a download method. You.

 (a) Even for data (= program) commonly used by a plurality of subscriber line termination devices, the data is individually assigned to each subscriber line termination device. In this case, information for uniquely identifying a specific subscriber line termination device (for example, device address information or device serial number) is included in the transmission data and transmitted individually to each subscriber line termination device.

 The following method is known as a method for determining whether to receive data broadcast by a receiving device when data is simultaneously transmitted to multiple devices by broadcasting.

 (b) The transmitting device arranges the data for each device on the receiving side in a fixed order and transmits it by broadcast, and each receiving device determines the number of data to be taken out of the transmitted data. It is stored in advance, and each receiving device counts the number of received data and receives the data corresponding to its own device. Such a method is described, for example, in Japanese Patent Application Laid-Open No. Hei 2-206865.

 (c) The program is divided into blocks, and information as to which block the receiving device takes in is determined in advance and held. The transmitting device sequentially sends a block by broadcast, and each receiving device selects a block corresponding to its own device and loads it directly into memory. Such a method is described in, for example, Japanese Patent Application Laid-Open No. 60-205632.

 In addition, the following method is known as a method of transmitting file data by broadcast and updating the files of multiple target devices at once.

 (d) Create a bucket from the renewal information such as the file name, version number, target model name, etc., and the file data, and send the bucket as a broadcast bucket to the communication network to which multiple target devices are connected. I do. Such a method is described, for example, in JP-A-5-324450.

In the above method ( _a ), even if the program is commonly used, it is necessary to repeat the same processing for the number of subscriber line terminating devices, and when the number is large, the time multiplied by the number is required. As a result, there is a problem that the time required to complete the download to all the subscriber line terminating devices becomes longer.

The above methods (b) and (c) are different from (a) in that they are transmitted by broadcast. It is more efficient than the law. However, in the method (b), the order of transmission data is determined in advance, and information about which data is to be received is transmitted to each subscriber line termination device on the receiving side beforehand. The problem is that complicated operations become difficult.

 In the method (c), a program to be transmitted is divided into blocks in advance, and information on which block is received by each subscriber line termination device on the receiving side is transmitted in advance. A complicated operation is required in advance to specify which data is received by the line termination device, and it is not possible to download different programs to different subscriber line termination devices at the same time.

 In the method (d), the update information is always added to the header of each packet, and if the data length of one bucket is short, such as an ATM cell (53 bytes), the ratio of file data However, there is a problem that the size is small and waste is large. Also, it is troublesome to provide each subscriber line termination device with update information such as a file name, a version number, and a target model name in advance in order to download an initial program in preparation for (1). . Disclosure of the invention

 The present invention provides a download method capable of improving data fe efficiency and downloading data in a short period of time without performing complicated operations in advance, and testing a transmitting device and a receiving device applied thereto. A general purpose.

 In order to achieve this object, the present invention selects "^" among a plurality of receiving devices connected to a transmitting device, and broadcasts the selected device to the selected receiving device from the transmitting device. A download method for downloading data,

 The transmitting device broadcasts a download start message including the target device designation information and the broadcast identifier to all the receiving devices.

 Thereafter, the knitting transmitting device broadcasts a data message including the same broadcast identifier and data as the knitting start message to all receiving devices,

When each of the receiving-side devices satisfies the target device designation information of the download start message, the attribute information of the own device stores a broadcast identifier from the down-port start message, Thereafter, when the broadcast identifier of the data message is equal to the broadcast identifier stored in the own device, each receiving device is configured to capture the data of the data message.

 According to such a down-logging method, a complicated message is not required in advance to specify which receiving device receives which data, and a message having information for identifying the target device, Since the data for data transmission is separated from the data for data transmission, there is no need to set update information in the data for data transmission, which improves the data efficiency and the data with the information for specifying the location and the data for data transmission The data can be downloaded in a short time to broadcast the message. BRIEF DESCRIPTION OF THE FIGURES

 Other objects, features and advantages of the present invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings.

 FIG. 1 is a system configuration diagram of an embodiment of an ATM-PON to which the present invention is applied.

 FIG. 2 is a block diagram of an embodiment of a part to which the present invention is applied in a subscriber line termination device.

 FIG. 3 is a block diagram of an embodiment of a portion to which the present invention is applied in a line termination device. FIG. 4 is a diagram showing the format of a PLOAM cell and a download cell for download start.

 FIG. 5 is a flowchart of one embodiment of the processing executed by the subscriber line terminal. FIG. 6 is a data flow of the first embodiment of the system to which the present invention is applied.

 FIG. 7 is a data diagram of a second embodiment of the system to which the present invention is applied.

 FIG. 8 is a data flow of the third embodiment of the system to which the present invention is applied.

 FIG. 9 is a data flow of a fourth embodiment of the system to which the present invention is applied. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows a system configuration diagram of an embodiment of an ATM-PON to which the present invention is applied. In the figure, N subscriber line terminators 1 0, -1 ON 2 and the optical path 14 are connected in a star shape. Terminal devices 16 to 16 _N are connected to the respective subscriber line terminating devices 10 to 1 ON. Here, the downstream ATM cells from the line terminating device 12 to each of the subscriber line terminating devices 1 Oj to 1 ON are branched at the optical splitter 18, and all the subscriber line terminating devices 1 (to 10 _The same ATM cell is transmitted to _N.

Each network unit 1 0, to 1 0 _N refers to the header part of the received ATM cell, it has a function to determine whether Heck JiSo. That is, if it is determined from the header of the received ATM cell that the ATM cell is a broadcast cell, the ATM cell is received by all the subscriber line terminating devices 10 to 1 ON. At this time, each subscriber line terminating device receives the ATM cell if the header is the value associated with the own device, and if the header is not the value associated with the own device, the ATM cell receives the ATM cell. ATM cells are discarded without being received.

 FIG. 2 is a block diagram showing an embodiment of a part to which the present invention is applied in a subscriber line termination device.

 In the figure, a transmission / reception unit 21 transmits / receives ATM cells to / from a line termination device 12. The ATM cell received by the transmission / reception unit 21 is supplied to the reception data distribution unit 22. The reception data distributing unit 22 receives the received ATM cell from a PL OAM (Physica 1 Layer Operation on Ad m inistrati on Ma int ence nce) cell for starting the download or a cell of normal data addressed to the own device. It is determined whether the cell is a download data cell addressed to the own device.

 Then, if the received data is a PL0 AM cell for downloading, the received data distribution unit 22 supplies the target device designation information extracted from the PL0 AM cell to the determination means 23 by itself, and outputs the normal data addressed to the own device. If it is a cell, it is supplied to the normal data processing unit 25, and if it is a down-to-one data cell addressed to its own device, it is supplied to the down-to-data processing unit 26.

The device TO information storage unit 24 is a non-volatile memory, and includes “device serial number”, “production date”, “hardware version J”, “device type”, and “production Maker identification number ”and“ Software / firmware version ”are stored. Attribute information for identifying each device is stored in the device when the device is manufactured. That is, the equipment information storage unit 24 is an existing circuit.

 The own device address determination means 23 reads the attribute information of the own device from the device attribute information storage unit 24, compares the attribute information with the target device designation information extracted from the PL OAM cell, and outputs a PL 0 AM for starting the download. It is determined whether or not the cell is addressed to the own device, and the result of the determination is notified to the reception data distribution unit 22.

 Then, when the PL0 AM cell for starting the down port is addressed to the own device, the reception data distribution unit 22 extracts the program broadcast identifier from the PL0 AM cell for starting the download, It is stored in the register in the reception data distribution unit 22.

 The normal data processing unit 25 performs the normal data processing supplied from the reception data distribution unit 22. The download data processing unit 26 extracts program data from the download data cell addressed to the own device supplied from the reception data distribution unit 22 and stores the program data in the download data storage unit 27.

 FIG. 3 is a block diagram showing an embodiment of a portion to which the present invention is applied in the line terminating device. In the figure, a sequence control unit 31 activates a download data transmission identifier definition unit 32 and a download data transmission destination definition unit 33 according to a program download procedure. When the download data overnight transmission identifier definition unit 32 is activated, the program broadcast identifier, which is defined in advance, is downloaded. The download start PLO AM cell generation unit 34 and the download data overnight generation unit 3 5 To supply. When the download data transmission destination definition section 33 is started, it supplies a transmission destination defined in advance to the download start PL0 AM cell creation section 34.

The download start PL〇AM cell creation unit 34 is supplied with the program broadcast identifier and the transmission destination, creates the download start PL0 AM cell shown in FIG. 4 (A), and sends it together with the broadcast data transmission request. This is supplied to the transmission / reception section 37. The PL OAM cell for starting the download has a broadcast header at the beginning as shown in Fig. 4 (A). This part corresponds to a 5-byte ATM header containing VPI / VC I (virtual path identifier Z virtual channel identifier), and indicates the broadcast of PT (payload type) power OAM in the ATM header. In the information field that follows, One or more data blocks consisting of the start command, block length, target device specification method, and device specification data are set. The identifier download start command identifier has a unique value.

The length of the block indicates the instruction of the device and the data length of the specified data of the target device. Finger ^^ method of the target device, "a device serial number", "date of manufacture eyes", Γ hardware version number j, "device type", "manufacturer identification number j," Sofutue § _/ / firmware version number " Specify one of The specified data of the target device is

"Matches that value", "Specifies the upper limit value and less than or equal to it", ΓSpecifies the lower limit value and more than that value "," Specifies the upper limit value and less than that value "," Specifies the lower limit value, Specify a value greater than j, or “Specify the upper and lower limits and within that range”.

 Furthermore, a program broadcast identifier and a trailer are set at the end, and the PLOAM cell for starting download ends. The program broadcast identifier sets a unique value for each program that is downloaded.

 If all the data blocks do not fit in the information field of one PL0 AM cell, a flag is set instead of setting the program broadcast identifier, and the first PL0 AM cell is terminated. After that, set the data entry that did not fit in the information field of the PL0 AM cell, and finally set the program broadcast identifier.

 Fig. 4 (B) shows a PLOAM cell for starting download in which the actual value is written in the data block. In the figure, the block length a1 indicates 5 bytes, and the target device specification method a2 value 1 The upper 1 digit of 1 1 matches the vendor code (manufacturing identification number) and the lower 1 digit matches. And the vendor code “500” is specified in the designated device a3. The length b 1 of the next block indicates 10 bytes, and the designation method of the target device The value 1 of b 2 indicates that the upper 1 digit of the 3 5 indicates the version number and the lower 1 digit indicates the in-range match. The specified data b3 indicates the version number from "0 1 0 1" to "0 1 0 3".

The download data creation unit 35 is supplied with the program broadcast identifier, and is supplied with the preset download data, that is, the program data from the download data storage unit 36, and the download data shown in FIG. Data cell Is created and supplied to the transmission / reception unit 37 together with the download data transmission request. The download data creation unit 35 creates down-load data at predetermined time intervals that can be continuously received by the subscriber line termination device in accordance with an instruction from the broadcast interval setting unit 38.

 The download data cell has a broadcast header at the beginning as shown in Fig. 4 (C). This part is equivalent to a 5-byte ATM header containing VPI ZVCI (virtual path identifier Z virtual channel identifier), and the PT (payload evening) in the ATM header indicates the broadcast. In the following information fields, a program broadcast identifier, a fiber flag, and program data are set. The program broadcast identifier is the same value as the value set by the program broadcast identifier of the PLOAM cell for starting the download. The «flag indicates that the value 1 is ^^ and the value 0 is final. Data constituting the program to be downloaded is sequentially set as program data.

 The transmission / reception unit 37 transmits / receives ATM cells to / from the subscriber line terminating devices 10 and -1ON. The transmission / reception section 37 transmits the PL0 AM cell for download start to the optical transmission line 14 in response to a transmission request from the download start PL0 AM cell generation section 34, and the download port data generation section 35 The download data cell is transmitted to the optical feit path 14 in response to a transmission request from.

 FIG. 5 shows a flowchart of an embodiment of a process executed by the subscriber line terminal. In the figure, in step S10, one ATM cell is received from the optical transmission line 14. Next, in step S12, whether or not the ATM cell has a broadcast header is used to determine whether or not it is broadcast data. If not, the flow proceeds to normal data reception processing. If it is broadcast data, the flow advances to step S14 to determine whether or not a download start command identifier or a program broadcast identifier is present at the head of the information field.

Here, when neither the download start command identifier nor the program broadcast identifier is set, the process proceeds to other broadcast data. If the download start command identifier is set, since this ATM cell is a PL0 AM cell for starting download, it is currently being downloaded in step S16, that is, receiving the download. It is determined whether or not the program broadcast identifier for this is stored in the reception data distribution unit 22 of its own device. If it is not currently waiting to receive a download, in step S18, the target device specification information, which consists of the block length, the target device action, and the target device specification data, is compared with the If of its own device. Then, it is determined whether or not the own device is the target device. If the own device is not the target device, the received ATM cell is discarded in step S20, and the process proceeds to step S10. If the own device is the target device, the program broadcast identifier is stored in the received data distribution unit 22 in step S22, and the process proceeds to step S10.

 If it is currently waiting for download reception in step S16, the process proceeds to step S24, and since download reception has already been started, the newly received download start PLO AM cell is discarded. And proceed to step S10.

 On the other hand, if the program broadcast identifier has been set in step S14, whether it is currently in the download receiver in step S26, that is, the program broadcast identifier for It is determined whether or not it is stored in the reception data distribution unit 22. If the download is not currently available, the received ATM cell is discarded in step S28, and the process proceeds to step S10.

 If it is currently waiting for download reception in step S26, in step S30 the program broadcast identifier of the received ATM cell is compared with the program broadcaster stored in the reception data sorting unit 22 of the own device. It is determined whether or not they match, and if they do not match, the received ATM cell is discarded in step S28, and the flow advances to step S10. If they match, the process proceeds to step S32, where the program data is extracted from the received ATM cell and stored in the download data storage unit 27.

 Thereafter, in step S34, it is determined whether or not the flag indicates that the received ATM cell is a flag. move on. Also, in the final case, in step S36, the program broadcast identifier of the received data sorting unit 22 is erased to cancel the state of waiting for download, and it is notified whether or not the down mode has been normally performed. Therefore, the reception result is notified to the user terminal device or the line termination device connected to the own device, and the process proceeds to step S10.

FIG. 6 shows a data flow of the first embodiment of the system to which the present invention is applied. In this data flow, the subscriber line termination device 10, is connected to the manufacturer identification number (the vendor code). W de) = 500, a software / firmware version = 0101, the network unit 1 Omicron iota, manufacturer identification number = 500, network unit 10 ₂ software Z firmware version = 0103 The subscriber line termination device 10 ₃ has a manufacturer identification number of 700, and the subscriber line termination device 1 (

5 It is assumed that the firmware version = 0101.

Here, PLOAM cell SEL 1 having a download start command (assuming, for example, that the manufacturer's identification number is equal to 500 as the target device designation information) is broadcast, and the subscriber line termination device 10 ,, 10 _2, 10 ₃ respectively and the ratio 0 compare the manufacturer identification number of the manufacturer identification number and PLOAM cell SEL1 of JiSo location, subscriber »tip device 10 which matches both force], 10 ₂ PLOAM cell SE The program broadcast identifiers of L1 are stored, and these are in a reception standby state.

 Next, when download data cells SEL2 and SEL3, whose program broadcast identifier is the same as PLOAM cell SEL1, are broadcast sequentially, data cell S

EL2, SEL3, "'SELn Each download data is

15 Introduced in positions 10,, 10 ₂ . The download of the program ends at this point because the continuation flag of the cell SELn indicates the last time.

FIG. 7 shows a data flow of a second embodiment of the system to which the present invention is applied. Here, the PLOAM cell SELA 1 having the download start command is broadcast, and the PLOAM cells 10> and 10 ₂ whose target designation information matches the

20 Cell The program broadcast identifier A of SELA 1 is saved and the system enters the reception standby state.

Next, when download download cells SELA2, SELA3, and EL An whose program broadcast identifier is the same A as PLOAM cell SEL 1 are broadcast sequentially, the download data cache of each of data cells SELA2, SELA3, and EL An It is taken into the mouth line termination device 1 (, 10 ₂ ).

25 At this time, before the data cell SELAn whose ^^ flag indicates the end is broadcast, the PL 0 AM cell SEL B 1 having the download start command of the program broadcast identifier B is broadcast before the data cell SELAn is broadcast. The PLOAM cell SEL B 1 is ignored because the subscriber line terminating equipment 1 (, 10 ₂₎ is in the middle of the down port of the program broadcast identifier A. On the other hand, network unit 10 ₃ target designation information is reception standby state to save the own apparatus and one ¾f order PL_〇 AM cell S ELB 1 program broadcast identifier B. The network unit _103, when downloading data cell S ELB2 the following programs broadcast identifier is PLOAM cell Le SEL 1 same as B is broadcast, captures the downloaded data in the data cell SELB 2 .

 FIG. 8 shows a data flow of the third embodiment of the system to which the present invention is applied. Here, the PL 0 AM cells SEL 1 a and SEL lb having the download start command are broadcast. Here, since all the data blocks cannot be stored in the information field of one PL0 AM cell SEL1a, instead of setting the program broadcast identifier, the fiber flag is set and the PL0 AM cell SEL1a is set. Ends a, sets the data block that does not fit in the information field of the following PLOAM cell SEL 1 b, and finally sets the program broadcast identifier.

PLOAM cell SEL 1 a, SEL 1 b targeting information Subscriber line terminating apparatus matches with the own apparatus 10 !, 10 ₂ to stored program Doho識Besshi the PLOAM cell SEL 1 b listens to忧State.

Next, when the broadcast data identifier SEL2, SEL3, "'SELn whose program broadcast identifier is the same as the PL〇AM cell SEL1b is broadcasted sequentially, the data cells SEL2, SEL3,"' SELn are downloaded. data network unit 10, are incorporated into 10 _2. Then, since the flag of the cell SELn indicates the final state, the program download ends at this point.

FIG. 9 shows a data flow of a fourth embodiment of the system to which the present invention is applied. Here, in order to transmit the program download data to all the subscriber line terminating devices 10, 10 ₂ , and 10 ₃ connected to the line terminating device 12, the PL 0 AM cell S ELC 1 having a download start command is transmitted. Program broadcast! ^ Broadcast without setting IJ child. Thus, regardless of the target device specifying information of the PLOAM cell SELC 1, all the network unit 10, 10 _2, 10 ₃ is a reception standby state by a program Doho識Besshi blank.

Next, when the download data cells SEL C2, SELC3, and SEL Cn in which the program broadcast identifier is not set are broadcast sequentially, the data cell SELC2, SELC3, -SEL C n each download data every network unit 10, are incorporated into 10 _2, 10 _3. The download of the program ends at this point because the flag of the download data cell SELCn indicates the end.

 In the present invention, the target device of the program download is specified by using the attribute information (for example, software / firmware version number) originally stored in the device, and it is possible to determine which subscriber line termination device receives which data. Do not use il ^ for complicated operations in advance to specify. Also, by separating the PL0 AM cell that has a download start command with information for identifying the target device and the download data cell for program transmission, the download data cell updates the target model name and other information in the download data cell. Without setting information, data efficiency is improved.

 Also, since the above PL0 AM cell and download data cell are broadcast, and each designated subscriber line termination device fetches and stores the independently downloaded program data, downloading of data such as programs is completed in a short time. It can be performed.

 In addition, before transmitting the download data cell, set the total amount of blue cells or the number of cells of the download data cell to be transmitted to the PLOA cell to be transmitted in advance, and use it to divide the data into multiple cells. A method of determining the end of the downloaded download data cell may be used.

The subscriber line terminating devices 101 to 10 _N correspond to the receiving device described in the claims, the line terminating device 12 corresponds to the transmitting device, and the P LOAM cell corresponds to the download start message. The download data cell corresponds to the data message, the down-call start PL0 AM cell creation unit 34 corresponds to the first broadcast means, and the down-call data creation unit 35 corresponds to the second broadcast. According to the means, the receiving data distribution unit 22 corresponds to the broadcast identifier stage, and the download data processing unit 26 corresponds to the data acquisition means.

Claims

The scope of the claims 1. A download method of selecting "^" from among a plurality of receiving devices connected to a transmitting device, and downloading data by broadcasting from the sibling device to the selected receiving device. ,  The receiving device broadcasts a download start message including the target device designation information and the broadcast identifier to all the receiving devices,  Thereafter, the iii communication-side device broadcasts a data message containing the same broadcast identifier and data as the start message to all the reception-side devices,  When the attribute information of its own device satisfies the target device specification information of the download start message, each receiving device saves the broadcast identifier from mi self download start s¾. When the broadcast identifier of the data message matches the broadcast identifier stored in the own device, a down-loading method for fetching the data of the data message.  2. In the download method described in claim 1,  The download method in which the download start message includes a plurality of messages.  3. In the download method described in claim 1,  A download method, wherein the target device designation information includes a target device measure and target device designation data.  4. In the download method described in claim 1,  A download method having a plurality of blocks having a target device designation method and target device designation data, wherein the target device designation information is a target device designation method and a target device designation data.  5. In the download method according to claim 3,  The method of the target device is a method of the type of attribute information and the ratio method, and the editing target device designation data is a download method that is a reference value for comparison.  6. The download method described in claim 5  The download method, wherein the attribute information is a device serial number.  7. The download method described in claim 5 The editing information is the download method, which is the software / firmware version number. 8. The download method described in claim 1  The downloading method, wherein the receiving device is a recovery device, and the receiving device is a subscriber line termination device.  9. A transmitting device that selects "^" from among a plurality of receiving devices and downloads data to the selected receiving devices by broadcasting.  First broadcast means for broadcasting the download start m¾ including the target device designation information and the broadcast to all the receiving devices;  A transmitter device having a second broadcast means for broadcasting a data s¾ including the same broadcast identifier and data as the self-started s¾ to all the receiving devices.  1 0. A receiving device that is connected to a plurality of transmitting devices, some of which are selected, and whose data is downloaded from the receiving device by broadcasting. ダ ウ ン ロ ー ド When the download start message including the m-position designation information and the broadcast identifier is broadcast from the receiving device, and the attribute information of the own device satisfies the device designation information of the self-download download m¾, the broadcast starts from the download start. Broadcast identification that preserves the translator II T  The receiving device broadcasts a data message including the same broadcast child and data as the start of the self-editing to all the receiving devices, and stores the broadcast identifier of the self-data message in its own device. A receiving side device having data capturing means for capturing data of the data message when the broadcast identifier matches the existing broadcast identifier.