KR100882356B1 - Apparatus and method for supporting data transmission service of high speed - Google Patents

Abstract

The present invention, in the Bluetooth system having a unified network structure by applying a high-speed ultra-wideband (UWB) technology, to support a high-speed data transmission service by connecting the Bluetooth host region of the upper layer and the ultra-wideband region of the lower layer. For this purpose, a protocol adaptation layer (PAL) management entity unit branches command data received from the upper layer into local and remote state commands to perform event processing, and processes the command data received in the lower layer to process the higher layer. A protocol adaptation layer (PAL) packet which transmits to a layer and includes the command data in ultra-wideband data by a frame convergence service layer entity unit (FCSL), transmits the packet to the lower layer, and receives the data received from the lower layer. Interpret a type so that the received data type is command data If, by sending the received command data portion wherein the protocol adaptation layer (PAL) management entity, it is possible to high-speed data services to existing it could not have a Bluetooth application.

Bluetooth, Ultra Wide Band (UWB), Protocol Adaptation Layer (PAL), MBOA MAC, HCI

Description

Apparatus and method for supporting high speed data transmission service in Bluetooth system {APPARATUS AND METHOD FOR SUPPORTING DATA TRANSMISSION SERVICE OF HIGH SPEED}

The present invention relates to an apparatus and method for supporting a high speed data transmission service in a Bluetooth system. In particular, the present invention relates to a protocol adaptation layer (PAL) that integrates Bluetooth and ultra wideband (UWB) technology for high speed data transmission. An apparatus and method for supporting a service are provided.

The present invention is derived from a study conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management Number: 2006-S-071-01, Title: Ultra-fast Multimedia Transmission UWB Solution] .

In general, Bluetooth wireless technology is an innovative technology that frees users from wired connections and is designed for point-to-point and point-to-multipoint communications at close range within 10 meters. Bluetooth applications currently in use range from handhelds to mobile cars to mobile phones, especially in Europe, with a broad user base. Bluetooth is evolving rapidly due to its low cost, ease of use and lack of a separate loyalty to Bluetooth technology, and the ability to support a variety of services.

However, despite the advantage that the existing Bluetooth technology can support various services centered on voice data, applications have been used mainly on low-speed data services. In other words, audio data service-oriented applications have mainly used Bluetooth technology. Among the multimedia data, which is expected to increase in frequency in the future, video data service requires a high speed, which is insufficient for existing Bluetooth products. It was.

As a result, technologies for supporting high-speed data transmission services have been developed in general Bluetooth technology. The most popular technology for such high-speed wireless technology is to incorporate ultra-wideband technology into Bluetooth. By using such ultra-wideband technology, a protocol adaptation layer integrating Bluetooth and ultra-wideband technology is used to support high-speed communication service. Technology was needed.

However, until now, it is difficult to integrate Bluetooth and ultra-wideband technology. That is, in the existing environment, two wireless communication protocols, Bluetooth and ultra-wideband, exist as independent radio technologies, and Bluetooth at low speed and ultra-wideband technology at high speed are used.

Accordingly, an object of the present invention is to provide a method and apparatus for supporting a high speed data transmission service by applying a UWB technology, which is a high speed wireless technology, to a Bluetooth system having a limitation of a low speed data communication service.

In addition, another object of the present invention is to implement a protocol adaptation layer (PAL) necessary to overcome the limitations of the low speed communication service in a Bluetooth system to support a high speed data transmission service to enable processing of not only audio data but also large-capacity video data. A method and apparatus are provided.

The apparatus for supporting high-speed data transmission service in a Bluetooth system for achieving the above objects of the present invention performs branching of command data received from an upper layer, which is a Bluetooth region, into a local state and a remote state command, and performs an event processing. A protocol adaptation layer (PAL) management entity unit for processing command data received in a lower layer which is an area and transmitting the received command data to the upper layer; And generating a protocol adaptation layer (PAL) packet including command data received from the upper layer in ultra-wideband data, and transmitting the generated protocol adaptation layer packet to the lower layer, and receiving the data type received from the lower layer. And a frame convergence service layer entity unit (FCSL) for transmitting the received command data to the protocol adaptation layer (PAL) management entity unit if the received data type is command data.

On the other hand, the high-speed data transmission service support method in a Bluetooth system for achieving the objects of the present invention, the process of receiving an indication signal according to the data reception from the lower layer of the ultra-wideband region; Classifying the received data according to the indication signal; If the received data is general data transmitted when communicating with an external device, transmitting the data directly to a higher layer of a Bluetooth region; Generating an event packet according to the indication signal if the received data is command data; And a step of branching the command data into local and remote state commands according to the event packet generation, processing the command data, and transmitting the command data to the upper layer and then connecting the upper layer and the lower layer to a high speed communication service. Characterized in that it supports.

In addition, a method of supporting a high speed data transmission service in a Bluetooth system for achieving the objects of the present invention may include: receiving data from an upper layer, which is a Bluetooth region, and confirming a data type; Dividing the command data into a local state or a remote state command if the received data is command data; Generating a protocol adaptation layer packet including the command data in ultra-band data when the command data is divided into a remote state command; And transmitting the generated protocol adaptation layer packet to a lower layer which is an ultra-wideband region. The protocol adaptation layer connecting the upper layer and the lower layer supports a high speed communication service.

As described above, the present invention can enable a high-speed data service that has not been possible with a Bluetooth application by using a high-speed wireless technology called UWB in the lower layer of the Bluetooth application mainly for the low-speed service mentioned above. Through this, it is possible to apply Bluetooth technology to more diverse applications such as extending the application range of Bluetooth technology, which is the most widely used wireless technology, to audio-oriented services as well as video-oriented services.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In the embodiment of the present invention, a single network structure will be described by integrating two independent wireless technologies, Bluetooth and ultra wideband (hereinafter referred to as UWB), each of which is differentiated from each other. By implementing a protocol adaptation layer (hereinafter referred to as PAL) between two protocols required for transmission, Bluetooth, a low-speed service-only wireless technology in the upper layer, provides high-speed data transmission service using UWB, a high-speed service-only wireless technology in the lower layer. The device to support will be described. In addition, the functions and methods between the two protocols, Bluetooth and UWB, required to convert and process low-speed Bluetooth data into high-speed UWB data in the high-speed data transmission service supporting apparatus will be described.

1 is a diagram illustrating an integrated network structure of a Bluetooth system according to an embodiment of the present invention.

In general, the network structure of a Bluetooth system is divided into a Bluetooth host and a Bluetooth module, and the Bluetooth module is a part that handles transmission or reception of actual data. However, in the embodiment of the present invention, the Bluetooth module is replaced with UWB technology.

Referring to FIG. 1, a Bluetooth and UWB integrated network structure may be divided into a Bluetooth host portion and a UWB portion.

The Bluetooth host portion includes a Bluetooth application layer (hereinafter referred to as BT application) layer 10, a Bluetooth profile layer 20, and a logical link management layer (L2CAP) layer 30 from the top. ) And a Human Computer Interface (hereinafter referred to as HCI) layer 40.

The Bluetooth application layer 10 includes Bluetooth applications such as mobile phones, portable terminals, and other devices using Bluetooth technology.

The Bluetooth profile layer 20 is a layer located directly below the BT application layer 10, and includes RFComm, Audio, SDR, TCS, and the like. The Bluetooth profile may be understood as a part in which a data service processing method used by a Bluetooth application is defined. That is, when the Bluetooth application 10 supports various types of services according to data types, it is a layer that defines in detail how to process according to each service data type. For example, if a Bluetooth application wants to transmit / receive AV data, it should use a profile for AV to process AV data.

The L2CAP layer 30 is a layer located below the Bluetooth profile layer 20. The L2CAP layer 30 converts the data to send the data coming from the upper Bluetooth application layer 10 to the Bluetooth module and transmits the data to the HCI layer 40. . In this case, the data conversion means changing the L2CAP data structure to the HCI data structure. In addition, the L2CAP layer 30 distinguishes which protocol data is received when the data comes in through the HCI layer of the lower layer, and distributes and processes the protocol data to the appropriate protocol and creates a logical connection for actual data communication. In charge of.

The HCI layer 40 is a layer located below the L2CAP layer 30 and is an upper / lower layer connection part serving as an interface for connecting the lower Bluetooth module part and the upper layer. The HCI layer 40 defines a structure, a processing method, and the like for all data types that are actually exchanged with the Bluetooth module. Data types used include commands, events and general data. General data is divided into asynchronous connectionless (ACL) data, which is not isochronous, and Sharable Content Objects (SCO) data, which is isochronous.

Meanwhile, the UWB portion replacing the Bluetooth module may be divided into a multiband orthogonal frequency division division (OFDM) federated MAC (hereinafter referred to as MBOA MAC) layer 60 and a UWB physical (PHY) layer 70.

In the past, the MBOA MAC 60 has been developed under the standard of 802.15.3. Recently, with the growth of the WiMedia organization, the MBOA MAC 60 has been newly developed as a new MAC standard. The biggest difference between the two MAC technologies is that the resource usage method of the 802.15.3 MAC used previously uses the TDMA resource reservation method, whereas the new WiMedia MAC uses the resource usage method. It uses both the reservation method and the competition method of resource use. Here, the resource reservation usage method introduces the concept of medium allocation slot (MAS), which is a minimum resource usage unit, rather than making a resource reservation to use a resource for a predetermined time like the conventional TDMA. The reserved number of media allocation slots to be used is reserved. That is, if three media allocation slots are reserved for sending data, resources can be used until the time when the three media allocation slots are terminated. And the resource usage of the competition method that shows the biggest difference is similar to the competition method used in the wireless LAN technology.

Therefore, when there are two or more devices to use resources, these devices have a priority table for each type of data they want to use, have less idle time for resource usage, and then try to use the resources. We try to guarantee fairness. For example, a device that wants to send data with a higher priority has an advantage in using resources than a device that wants to use low-priority data because it starts using resources after idle time for relatively less time than a device that does not. You will be in a position. If more than one device attempts to use a resource at the same time, a resource access collision occurs. In this case, the crashed devices will retry using resources using a separate algorithm called the contention window. The competitive window approach is also related to the use of idle time for resource-specific attempts.

As described above, the embodiment of the present invention has a network structure in which two independent radio technologies are divided into upper and lower layers into one. Accordingly, a protocol adaptation layer (PAL Layer) 50 is formed between the Bluetooth host portion and the UWB portion in the network structure to facilitate communication processing between the protocols of the Bluetooth and UWB. The PAL layer 50 actually includes Bluetooth data in the UWB packet transmitted by the UWB PHY layer 70. Here, the UWB packet includes a protocol ID, a PAL header, and BT HCI data, as shown in FIG. 2.

In addition, the packet structure of the MBOA MAC layer 60, which is a lower layer of the PAL layer 50, has a preamble, a PLCP header, an MSDU for MBOA MAC, and a FCS, as shown in FIG. And Tail / Pad bits, wherein the PLCP header includes these information in the order of PHY header, Tail bits, MAC header, HCS, Tail bits, RS Code, Tail bits.

Next, the PAL structure of the Bluetooth technology and the UWB technology will be described in detail with reference to the accompanying drawings.

4 is a block diagram illustrating a structure of a device for supporting high speed data transmission service in a Bluetooth system according to an embodiment of the present invention.

Referring to FIG. 4, the PAL layer 50 includes a PAL management entity 110 that is responsible for processing commands and events transmitted / received during communication, and an actual communication frame structure. The frame convergence service layer entity (FCSL (Frame Convergence Service Layer) entity) 120 in charge of the processing is divided into. In this case, the PAL FCSL entity unit 120 includes an encapsulation function, a packet type check, and a verification check function.

The PAL management entity unit 110 includes a local dependency manager 111 for processing only locally in a device, a remote dependency manager 112 for communicating with an external device, and a higher Bluetooth. The event processing unit 114 for receiving and processing signals transmitted from the lower layer and the command data transmitted from the upper Bluetooth are divided into the local state and the remote state commands, respectively, and the local management unit ( 111 and a command processor 113 for transmitting to the remote management unit 112. The PAL management entity 110 may further include a link management unit 115, an isochronous management unit 116, and a PAL DB 117.

The local manager 111 manages commands not supported by the lower layer MBOA MAC layer 60, and these commands are defined only in a local to handle processing related to the Bluetooth native function. As illustrated in FIG. 5, the local manager 111 includes a command interpreter 201, a data read / write unit 202, a PAL database 203, a controller 204, and an event. The packet generator 205 is included.

The remote management unit 112 includes a function of establishing a connection with commands to be serviced using the lower layer MBOA MAC layer 60. In this case, it can be seen that all frames outgoing using the MBOA MAC layer 60 have a remote dependency. As shown in FIG. 6, the remote management unit 112 includes a command interpreter 301, a data read / write unit 302, a PAL database 303, a controller 304, and an event. The packet generator 305 is included.

The link manager 115 manages an Inquiry command to find all Bluetooth devices in the vicinity, a channel number of a MAC layer and a device related to a connection for actual data communication.

The isochronous management unit 116 is a routine for processing commands related to isochronous management and control among HCI commands for synchronous data transmission.

Finally, the PAL database 117 of the PAL management entity 110 is a memory space for storing data branched to the Bluetooth upper Bluetooth upper layer, MAC and Bluetooth according to the PAL implementation.

A method for supporting the high speed data transfer service in the PAL of the high speed data transfer service support apparatus having the above structure will be described in detail.

First, when an arbitrary request message for processing according to a request of an external remote device arrives, the MBOA MAC layer 60 transmits an indication signal indicating the reception of the message to the FCSL entity unit 120, and thus PAL. A process for supporting the high speed data transmission service in the FCSL entity unit 120 included in the high speed data transmission service supporting apparatus of the layer 50 will be described with reference to the accompanying drawings.

7 is a flowchart illustrating a process for supporting a high speed data transmission service of an FCSL entity unit in a Bluetooth system according to an embodiment of the present invention.

Referring to FIG. 7, in step 401, when the PAL FCSL entity unit 120 of the PAL layer 50 receives the indication signal, in step 402, the PAL FCSL entity unit 120 confirms or receives the type of data included in the request message. Check whether the data written is general data or command data for system control function. As a result of the check, if the received data is general data, in step 403, the PAL FCSL entity unit 120 transmits the general data to a higher layer, that is, the Bluetooth application layer 10, and ends the operation.

On the other hand, if the received data is command data for the system control function, in step 404 the PAL FCSL entity unit 120 encapsulates the data for the system control function event processing unit of the PAL management entity unit 110 ( 114). That is, when the FCSL entity unit 120 transmits indication events according to the transmitted indication signal to the remote management unit 112, the event packet generator 305 of the remote management unit 112 transmits to the delivered indication event. After generating an event packet including the data for the event processor 113 transmits the generated event packet to the upper layer. Here, the MBOA MAC layer 60 of the UWB communicates data through a specific channel. As such, the data type for the system control function that Bluetooth can process in association with the UWB MAC layer 60 includes command data including various commands for system control, and general data transmitted when communicating with the counterpart device through the system. There is this. Here, the general data may be audio or plain text data, depending on the data type. Data for system control is classified and processed as an event from the receiving side.

Next, with reference to the accompanying drawings, the operation of the PAL management entity to process the case of receiving data from the upper layer, that is, the Bluetooth application layer, and the high-speed data transmission service through interworking with the FCSL entity. Let's explain.

8 is a flowchart illustrating a process for supporting a high speed data transmission service in a PAL management entity unit in a Bluetooth system according to an embodiment of the present invention.

Referring to FIG. 8, when the PAL management entity unit 110 receives data from a higher layer in step 501, the PAL management entity unit 110 determines whether the received data is general data or command data in step 502. do. As a result of the check, if the general data, in step 503, the PAL management entity unit 110 directly transmits the general data to the FCSL entity unit 120. Accordingly, the FCSL entity unit 120 generates a PAL packet including the general data and transmits the PAL packet to the Bluetooth application layer.

In contrast, when the received data is command data, in step 504, the PAL management entity unit 110 transmits the command data to an internal command processor 113. Accordingly, in order to maintain compatibility of the upper layer of Bluetooth, the command processing unit 113 classifies a command dependent on the host on the HCI layer 40, that is, transfers the HCI command to the local manager 111. That is, in step 505, the PAL management entity unit 110 checks whether the command processing unit 113 processes the command data as a local status command or a remote status command. As a result of the check, in the case of the HCI command to be processed as the local status command, in step 506, the PAL management entity unit 110 executes the HCI command transmitted through the local management unit 111, configures the execution result as an event packet, and then processes the event. In step 507, the event packet generated according to the event processing is transmitted to the upper layer after the event processing is performed by transmitting to the 114. FIG. This event processing is described in more detail with reference to FIG. 5 as follows.

 The command data branched from the command processor 113 and transmitted are interpreted by the command interpreter 201, and the interpreted result is transmitted to the data read / write unit 202. The data read / write unit 202 reads the information from the PAL database 203 if the interpreted result is a read command, and writes the information to the PAL database 203 if the read command is a read command. Then, when the processing of the command is completed, an event packet including the processing result is generated and transferred to the upper layer through the event processing unit 114.

On the other hand, when it is checked in step 505, when the received data is processed as a remote status command, in step 508, the PAL management entity unit 110 passes the event processing unit 114 to perform remote event processing, and then in step 509 FCSL The command is transmitted to the lower layer through the entity unit 120. The received data is command data including commands to be transmitted to the remote device using the MBOA MAC layer 60 among the HCI commands of the Bluetooth upper layer. This remote event processing process will be described in more detail with reference to FIG. 6 again as follows.

In order to process the command of the received data branched from the command processor 113 to the remote status command, the remote manager 112 interprets the command transmitted through the command interpreter 301, checks each parameter, and then reads the data. Transfer to / write unit 302. Then, if the interpreted result is a read command, the data read / write unit 302 reads the corresponding information from the PAL database 303, and if the read command writes the corresponding information to the PAL database 303. The remote management unit 112 transmits the identified parameters to the FCSL entity unit 120 and transmits a corresponding command to the lower MBOA MAC layer 60.

Meanwhile, the PAL FCSL entity 120 generates a PAL packet as shown in FIG. 3 by attaching a PAL header and a protocol ID to data transmitted from an upper layer, thereby generating a MAC layer 60. To send. The PAL packet thus transmitted is encapsulated in the UWB packet as shown in FIG. 3 and finally transmitted. In this case, the PAL packet is encapsulated in a MAC Service Data Unit (MSDU) part of the MAC packet structure. The transmitted packet is transmitted to the MBOA MAC layer 60 on the receiving side, and the MBOA MAC layer 60 performs data loss check through the validation of the packet, and decapsulates it again to extract the received PAL packet. It is determined whether the command to be transmitted to the remote management unit 112, synchronization data (Asynch. Data), and ISO data to be immediately uploaded to a higher layer through FCSL Service Advertising Protocol (SAP). This process is performed through the flag value in each packet. The flag value is used to distinguish whether the corresponding data is an instruction or general data.

As described above, since there is no Bluetooth PAL based on MBOA MAC, which is currently established as a new standard of UWB MAC, it is possible to develop a commercial PAL based on MBOA MAC with a PAL structure according to an embodiment of the present invention.

In addition, the PAL technology according to the embodiment of the present invention enables Bluetooth applications to use UWB technology, which is a high-speed wireless technology, at a lower layer so that Bluetooth applications that are widely used throughout the industry can be used at low speed as well as high speed. Like this, Bluetooth PAL technology is a technology that connects upper layer Bluetooth application with lower layer UWB technology to extend the range of Bluetooth technology from low speed to high speed. The service can be supported.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a block diagram showing an integrated network structure of a Bluetooth system according to an embodiment of the present invention;

2 is a block diagram showing the structure of a protocol adaptation layer packet according to an embodiment of the present invention;

3 is a block diagram showing the structure of an MBOA MAC packet according to an embodiment of the present invention;

4 is a block diagram illustrating a structure of a device for supporting high speed data transmission service in a Bluetooth system according to an embodiment of the present invention;

5 is a block diagram showing a detailed structure of a local management unit in a high speed data transfer service support apparatus according to an embodiment of the present invention;

6 is a block diagram illustrating a detailed structure of a remote management unit in a high speed data transfer service supporting apparatus according to an embodiment of the present invention;

7 is a flowchart illustrating a process for supporting a high speed data transmission service in a Bluetooth system according to an embodiment of the present invention;

8 is a flowchart illustrating a process for supporting a high speed data transmission service in a Bluetooth system according to another embodiment of the present invention.

Claims (11)

Protocol adaptation layer which performs event processing by branching command data received from an upper layer, which is a Bluetooth region, into local and remote state commands, and processes and transmits command data received in a lower layer, which is an ultra-wide band, to the upper layer. PAL) management entity part; And Transmit the protocol adaptation layer packet generated by generating a protocol adaptation layer (PAL) packet including command data received from the upper layer in ultra-wideband data, and interpret the data type received from the lower layer. High speed data in the Bluetooth system, characterized in that it comprises a frame convergence service layer entity (FCSL) for transmitting the received command data to the protocol adaptation layer (PAL) management entity unit if the received data type is command data. Transmission service support device. The method of claim 1, wherein the protocol adaptation layer (PAL) management entity unit, An instruction processor configured to receive data from the upper layer and branch instructions included in the input data; A local manager configured to manage and execute commands dependent on the Bluetooth host among the commands branched from the command processor, and generate an event packet including an execution result; A remote management unit managing commands to be transmitted to an external remote device through the lower layer among the commands branched from the command processing unit, and generating an event packet including data according to an indication event; And  High speed data transmission in the Bluetooth system, characterized in that for transmitting the event packet generated by the local management unit and the remote management unit to the upper layer, and generates the indication event according to the indication signal to the remote management unit Service support device. The apparatus of claim 2, wherein the protocol adaptation layer (PAL) management entity unit comprises: A link manager to manage external commands for finding external neighboring Bluetooth devices, a device related to a connection for actual data communication, and related information of the lower layer; An isochronous management unit processing a command for synchronized data transmission; And And a PAL database for storing data transmitted / received to the upper layer and the lower layer. The method of claim 1, The frame convergence service layer entity unit (FCSL) checks the type of data received from the lower layer, and if the received data is general data transmitted when communicating with an external device, immediately generates a PAL packet and delivers it to the upper layer. High speed data transmission service support apparatus in a Bluetooth system, characterized in that. The method of claim 4, wherein In the Bluetooth system, the frame convergence service layer entity unit (FCSL) checks the type of data received from the lower layer and transmits the received data to the protocol adaptation layer (PAL) management entity unit if the received data is command data. High speed data transfer service support device. The method of claim 1, The protocol adaptation layer (PAL) packet includes a protocol adaptation layer (PAL) header indicating data received from the upper layer and a protocol identifier indicating a type of an application protocol. Device. Receiving an indication signal according to data reception from a lower layer, which is an ultra-wideband region; Classifying the received data according to the indication signal; If the received data is general data transmitted when communicating with an external device, transmitting the data directly to a higher layer which is a Bluetooth region; Generating an event packet according to the indication signal if the received data is command data; And A high speed data transfer service is provided by a protocol adaptation layer that connects the upper layer and the lower layer, including the step of branching the command data into local and remote state commands according to the event packet generation and processing the command data. High speed data transmission service support method in a Bluetooth system, characterized in that for supporting. Checking a data type by receiving data from an upper layer which is a Bluetooth region; Dividing the command data into a local state or a remote state command if the received data is command data; Generating a protocol adaptation layer packet including the command data in ultra-wideband data when the command data is divided into a remote state command; And High speed in a Bluetooth system, characterized in that the protocol adaptation layer connecting the upper layer and the lower layer supports a high-speed data transmission service, including the step of transmitting the generated protocol adaptation layer packet to a lower layer which is an ultra-wideband region. How to support data transfer services. The method of claim 8, And generating an event packet including the command data and transmitting the event packet to the upper layer when the command data is divided into a local state command. The method of claim 8, And if the received data is general data transmitted when communicating with an external device, generating a protocol adaptation layer packet and transmitting the generated protocol adaptation layer packet directly to the lower layer. The method according to claim 8 or 9, The protocol adaptation layer (PAL) packet includes a protocol adaptation layer (PAL) header indicating data received from the upper layer and a protocol identifier indicating a type of an application protocol. Way.

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