KR20240041789A - Electronic device and method for transmitting data in electronic device - Google Patents

Abstract

According to one embodiment, an electronic device (101 in FIG. 1; 300 in FIG. 3) includes a communication circuit (190 in FIG. 1) and at least one processor (120 in FIG. 1) connected to the communication circuit (190 in FIG. 1). Includes. The at least one processor (120 in FIG. 1) sends an advertising message containing information about a first bitrate and a first transmission power used to transmit broadcast isochronous stream (BIS) data. You can control it to broadcast. The at least one processor (120 in FIG. 1) may control transmission of the first BIS data in the first interval based on the second bit rate and the second transmission power. The at least one processor (120 in FIG. 1) may control transmission of the second BIS data in the first interval based on the third bit rate and third transmission power.

Description

{ELECTRONIC DEVICE AND METHOD FOR TRANSMITTING DATA IN ELECTRONIC DEVICE}

Various embodiments of the present disclosure relate to electronic devices and methods for transmitting data in electronic devices.

LE (low energy) electronic devices of Bluetooth Core Version 5.2 or higher can support LE audio services through the broadcast isochronous stream (BIS) method or the connected isochronous stream (CIS) method.

In general, BIS services using LE audio are mainly used in video/audio electronic devices that can be connected to multiple users, and can be used as audio/video services for an unspecified number of people for a long time. Recently, the use of BIS services is gradually expanding for the purpose of simultaneously providing audio services to TVs or mobile electronic devices to a small group of users rather than an unspecified number of users.

According to one embodiment, an electronic device may include a communication circuit and at least one processor connected to the communication circuit. The at least one processor broadcasts an advertising message containing information about a first bitrate and a first transmission power used to transmit broadcast isochronous stream (BIS) data. You can control it to do so. The at least one processor may control transmission of the first BIS data in a first interval based on the first bit rate and the first transmission power. The at least one processor may control transmission of the second BIS data in the first interval based on the second bit rate and the second transmission power.

According to one embodiment, an electronic device may include a communication circuit and at least one processor connected to the communication circuit. The at least one processor may receive an advertising message containing information about a first bitrate and first transmission power used to transmit broadcast isochronous stream (BIS) data. The at least one processor may receive first BIS data transmitted based on the first bit rate and the first transmission power in a first interval. The at least one processor may receive second BIS data transmitted based on the second bit rate and second transmission power in the first interval.

According to one embodiment, a method of operating an electronic device includes sending an advertising message containing information about a first bitrate and a first transmission power used to transmit broadcast isochronous stream (BIS) data. It may include the operation of broadcasting. A method of operating an electronic device may include transmitting first BIS data in a first interval based on the first bit rate and the first transmission power. A method of operating an electronic device may include transmitting second BIS data in the first interval based on a second bit rate and a second transmission power.

According to one embodiment, a method of operating an electronic device includes sending an advertising message containing information about a first bitrate and a first transmission power used to transmit broadcast isochronous stream (BIS) data. It may include the operation of receiving. A method of operating an electronic device may include receiving first BIS data transmitted based on the first bit rate and the first transmission power in a first interval. A method of operating an electronic device may include receiving second BIS data transmitted based on a second bit rate and a second transmission power in the first interval.

According to one embodiment, a storage medium storing at least one computer-readable instruction may be provided. When executed by at least one processor, the at least one instruction may cause the electronic device to perform a plurality of operations. The plurality of operations includes broadcasting an advertising message containing information about the first bitrate and first transmission power used to transmit broadcast isochronous stream (BIS) data. It may include actions such as: The plurality of operations may include transmitting first BIS data in a first interval based on the first bit rate and the first transmission power. The plurality of operations may include transmitting second BIS data in the first interval based on a second bit rate and a second transmission power.

According to one embodiment, a storage medium storing at least one computer-readable instruction may be provided. When executed by at least one processor, the at least one instruction may cause the electronic device to perform a plurality of operations. The plurality of operations include receiving an advertising message containing information about a first bitrate and a first transmission power used to transmit broadcast isochronous stream (BIS) data. can do. The plurality of operations may include receiving first BIS data transmitted based on the first bit rate and the first transmission power in a first interval. The plurality of operations may include receiving second BIS data transmitted based on a second bit rate and a second transmission power in the first interval.

1 is a block diagram schematically showing an electronic device in a network environment according to an embodiment.
Figure 2 is a block diagram of an audio module according to one embodiment.
Figure 3 shows an example of operation of a plurality of electronic devices according to an embodiment.
Figure 4 is a diagram for explaining a BIG event and a BIS event according to an embodiment.
Figure 5A shows an example of BISs with a sequential arrangement according to one embodiment.
Figure 5b shows an example of BISs with an interleaved arrangement according to one embodiment.
Figures 6A to 6C each show an example of payload allocation within BIS according to one embodiment.
Figure 7 shows an example of a BIG including two BISs in a sequential arrangement according to one embodiment.
Figure 8a shows an example of an isochronous physical channel PDU (protocol data unit) format according to an embodiment.
Figure 8b shows an example of Broadcast Isochronous PDU Header according to one embodiment.
Figure 8c shows an example of a Broadcast Isochronous PDU Header flag according to an embodiment.
Figure 8d shows an example of the BIG Control PDU Payload format according to one embodiment.
Figure 8e shows an example of BIG Control PDU Opcodes according to an embodiment.
Figure 9 shows an example of the BIG information (BIGInfo) format according to one embodiment.
Figure 10 shows an example of a time reference of a BIG event from a periodic advertising event according to an embodiment.
Figure 11 is a flowchart showing the operation of a BIS source electronic device according to an embodiment.
Figure 12 shows an example in which an electronic device performs periodic advertising, according to an embodiment.
FIGS. 13A and 13B each show examples of an electronic device grouping BIS data into specific groups according to an embodiment.
FIGS. 14A to 14C each show examples of an electronic device transmitting BIS data according to an embodiment.
Figure 15A shows an example of payload transmission within BIS according to one embodiment.
Figure 15b shows an example of payload transmission within BIS according to one embodiment.
FIGS. 15C and 15D each show an example in which an electronic device increases the bit rate and transmission power of some data, according to an embodiment.
Figure 16 shows an example ISO Interval when an electronic device increases the bit rate and transmission power of specific data, according to an embodiment.
FIG. 17 shows an example in which an electronic device adjusts the bit rate and transmission power of general BIS data when data transmission related to PTO fails, according to an embodiment.
Figure 18 shows an example of an electronic device transmitting BIS data according to an embodiment.
FIG. 19A shows an example in which an electronic device selectively receives BIS data in a clean channel condition according to an embodiment.
Figure 19b shows an example of a reception buffer when an electronic device selectively receives BIS data in a clean channel condition according to an embodiment.
FIG. 20A shows an example in which an electronic device selectively receives BIS data in a busy environment with poor channel conditions, according to an embodiment.
Figure 20b shows an example of a reception buffer when an electronic device selectively receives BIS data in a busy environment with poor channel conditions, according to an embodiment.
Figure 21a shows an example in which an electronic device compulsorily receives BIS data, according to an embodiment.
Figure 21b shows an example of a reception buffer when an electronic device compulsorily receives BIS data, according to an embodiment.
Figure 22 shows a method of operating an electronic device according to an embodiment of the present disclosure.
Figure 23 shows an example in which an electronic device controls BIS data in detail, according to an embodiment.
Figure 24 shows another example in which an electronic device controls BIS data in detail according to an embodiment.
Figure 25 shows another example in which an electronic device controls BIS data in detail according to an embodiment.
FIGS. 26A and 26B are diagrams for explaining the operational effects of an electronic device according to an embodiment.

Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the attached drawings. Also, in describing an embodiment of the present disclosure, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of an embodiment of the present disclosure, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of functions in an embodiment of the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

It should be noted that the technical terms used in this specification are only used to describe specific embodiments and are not intended to limit one embodiment of the present disclosure. Alternatively, technical terms used in this specification, unless specifically defined in a different way in this specification, should be interpreted as meanings commonly understood by those skilled in the art to which this disclosure pertains, and may not be overly inclusive. It should not be interpreted in a literal or excessively reduced sense. Alternatively, if the technical terms used in this specification are incorrect technical terms that do not accurately express the spirit of the present disclosure, they should be replaced with technical terms that can be correctly understood by those skilled in the art. Alternatively, general terms used in an embodiment of the present disclosure should be interpreted as defined in a dictionary or according to the context, and should not be interpreted in an excessively reduced sense.

Alternatively, as used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, terms such as “consists of” or “comprises” should not be construed as necessarily including all of the various components or operations described in the specification, and some of the components or operations may include It may not be included, or it may be interpreted as including additional components or operations.

Alternatively, terms including ordinal numbers such as first or second used in this specification may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may also be referred to as the first component without departing from the scope of the present disclosure.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected to or connected to the other component, but other components may also exist in between. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

Hereinafter, an embodiment according to the present disclosure will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numerals regardless of the reference numerals, and duplicate descriptions thereof will be omitted. Alternatively, when describing an embodiment of the present disclosure, if it is determined that a detailed description of a related known technology may obscure the gist of the present disclosure, the detailed description will be omitted. Alternatively, it should be noted that the attached drawings are only intended to facilitate easy understanding of the spirit of the present disclosure, and should not be construed as limiting the spirit of the present disclosure by the attached drawings. The spirit of the present disclosure should be construed as extending to all changes, equivalents, and substitutes other than the attached drawings.

FIG. 1 is a block diagram schematically showing an electronic device 101 in a network environment 100 according to an embodiment.

Referring to FIG. 1, in the network environment 100, the electronic device 101 communicates with the electronic device 102 through a first network 198 (e.g., a short-range wireless communication network) or a second network 199. It is possible to communicate with the electronic device 104 or the server 108 through (e.g., a long-distance wireless communication network). According to one embodiment, the electronic device 101 may communicate with the electronic device 104 through the server 108. According to one embodiment, the electronic device 101 includes a processor 120, a memory 130, an input module 150, an audio output module 155, a display module 160, an audio module 170, and a sensor module ( 176), interface 177, connection terminal 178, haptic module 179, camera module 180, power management module 188, battery 189, communication module 190, subscriber identification module 196 , or may include an antenna module 197. According to one embodiment, at least one of these components (eg, the connection terminal 178) may be omitted or one or more other components may be added to the electronic device 101. In some embodiments, some of these components (e.g., sensor module 176, camera module 180, or antenna module 197) are integrated into one component (e.g., display module 160). It can be.

The processor 120, for example, executes software (e.g., program 140) to operate at least one other component (e.g., hardware or software component) of the electronic device 101 connected to the processor 120. It can be controlled and various data processing or calculations can be performed. According to one embodiment, as at least part of data processing or computation, the processor 120 stores instructions or data received from another component (e.g., sensor module 176 or communication module 190) in volatile memory 132. The commands or data stored in the volatile memory 132 can be processed, and the resulting data can be stored in the non-volatile memory 134. According to one embodiment, the processor 120 includes the main processor 121 (e.g., a central processing unit or an application processor) or an auxiliary processor 123 that can operate independently or together (e.g., a graphics processing unit, a neural network processing unit ( It may include a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor). For example, if the electronic device 101 includes a main processor 121 and a secondary processor 123, the secondary processor 123 may be set to use lower power than the main processor 121 or be specialized for a designated function. You can. The auxiliary processor 123 may be implemented separately from the main processor 121 or as part of it.

The auxiliary processor 123 may, for example, act on behalf of the main processor 121 while the main processor 121 is in an inactive (e.g., sleep) state, or while the main processor 121 is in an active (e.g., application execution) state. ), together with the main processor 121, at least one of the components of the electronic device 101 (e.g., the display module 160, the sensor module 176, or the communication module 190) At least some of the functions or states related to can be controlled. According to one embodiment, co-processor 123 (e.g., image signal processor or communication processor) may be implemented as part of another functionally related component (e.g., camera module 180 or communication module 190). there is. According to one embodiment, the auxiliary processor 123 (eg, neural network processing device) may include a hardware structure specialized for processing artificial intelligence models. Artificial intelligence models can be created through machine learning. For example, such learning may be performed in the electronic device 101 itself, where artificial intelligence is performed, or may be performed through a separate server (e.g., server 108). Learning algorithms may include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but It is not limited. An artificial intelligence model may include multiple artificial neural network layers. Artificial neural networks include deep neural network (DNN), convolutional neural network (CNN), recurrent neural network (RNN), restricted boltzmann machine (RBM), belief deep network (DBN), bidirectional recurrent deep neural network (BRDNN), It may be one of deep Q-networks or a combination of two or more of the above, but is not limited to the examples described above. In addition to hardware structures, artificial intelligence models may additionally or alternatively include software structures.

The memory 130 may store various data used by at least one component (eg, the processor 120 or the sensor module 176) of the electronic device 101. Data may include, for example, input data or output data for software (e.g., program 140) and instructions related thereto. Memory 130 may include volatile memory 132 or non-volatile memory 134.

The program 140 may be stored as software in the memory 130 and may include, for example, an operating system 142, middleware 144, or application 146.

The input module 150 may receive commands or data to be used in a component of the electronic device 101 (e.g., the processor 120) from outside the electronic device 101 (e.g., a user). The input module 150 may include, for example, a microphone, mouse, keyboard, keys (eg, buttons), or digital pen (eg, stylus pen).

The sound output module 155 may output sound signals to the outside of the electronic device 101. The sound output module 155 may include, for example, a speaker or a receiver. Speakers can be used for general purposes such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part of it.

The display module 160 can visually provide information to the outside of the electronic device 101 (eg, a user). The display module 160 may include, for example, a display, a hologram device, or a projector, and a control circuit for controlling the device. According to one embodiment, the display module 160 may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of force generated by the touch.

The audio module 170 can convert sound into an electrical signal or, conversely, convert an electrical signal into sound. According to one embodiment, the audio module 170 acquires sound through the input module 150, the sound output module 155, or an external electronic device (e.g., directly or wirelessly connected to the electronic device 101). Sound may be output through the electronic device 102 (e.g., speaker or headphone).

The sensor module 176 detects the operating state (e.g., power or temperature) of the electronic device 101 or the external environmental state (e.g., user state) and generates an electrical signal or data value corresponding to the detected state. can do. According to one embodiment, the sensor module 176 includes, for example, a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, It may include a temperature sensor, humidity sensor, or light sensor.

The interface 177 may support one or more designated protocols that can be used to connect the electronic device 101 directly or wirelessly with an external electronic device (eg, the electronic device 102). According to one embodiment, the interface 177 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

The connection terminal 178 may include a connector through which the electronic device 101 can be physically connected to an external electronic device (eg, the electronic device 102). According to one embodiment, the connection terminal 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).

The haptic module 179 can convert electrical signals into mechanical stimulation (e.g., vibration or movement) or electrical stimulation that the user can perceive through tactile or kinesthetic senses. According to one embodiment, the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module 180 can capture still images and moving images. According to one embodiment, the camera module 180 may include one or more lenses, image sensors, image signal processors, or flashes.

The power management module 188 can manage power supplied to the electronic device 101. According to one embodiment, the power management module 188 may be implemented as at least a part of, for example, a power management integrated circuit (PMIC).

The battery 189 may supply power to at least one component of the electronic device 101. According to one embodiment, the battery 189 may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

Communication module 190 is configured to provide a direct (e.g., wired) communication channel or wireless communication channel between electronic device 101 and an external electronic device (e.g., electronic device 102, electronic device 104, or server 108). It can support establishment and communication through established communication channels. Communication module 190 operates independently of processor 120 (e.g., an application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module 190 may be a wireless communication module 192 (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 194 (e.g., : LAN (local area network) communication module, or power line communication module) may be included. Among these communication modules, the corresponding communication module is a first network 198 (e.g., a short-range communication network such as Bluetooth, Wi-Fi (wireless fidelity) direct, or IrDA (infrared data association)) or a second network 199. It may communicate with an external electronic device 104 through (e.g., a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a long-distance communication network such as a computer network (e.g., LAN or WAN)). These various types of communication modules may be integrated into one component (e.g., a single chip) or may be implemented as a plurality of separate components (e.g., multiple chips). The wireless communication module 192 uses subscriber information (e.g., International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 196 within a communication network such as the first network 198 or the second network 199. The electronic device 101 can be confirmed or authenticated.

The wireless communication module 192 may support 5G networks after 4G networks and next-generation communication technologies, for example, NR access technology (new radio access technology). NR access technology provides high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and access to multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low latency). -latency communications)) can be supported. The wireless communication module 192 may support high frequency bands (eg, mmWave bands), for example, to achieve high data rates. The wireless communication module 192 uses various technologies to secure performance in high frequency bands, for example, beamforming, massive array multiple-input and multiple-output (MIMO), and full-dimensional multiplexing. It can support technologies such as input/output (FD-MIMO: full dimensional MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module 192 may support various requirements specified in the electronic device 101, an external electronic device (e.g., electronic device 104), or a network system (e.g., second network 199). According to one embodiment, the wireless communication module 192 supports Peak data rate (e.g., 20 Gbps or more) for realizing eMBB, loss coverage (e.g., 164 dB or less) for realizing mmTC, or U-plane latency (e.g., 164 dB or less) for realizing URLLC. Example: Downlink (DL) and uplink (UL) each of 0.5 ms or less, or round trip 1 ms or less) can be supported.

The antenna module 197 may transmit or receive signals or power to or from the outside (eg, an external electronic device). According to one embodiment, the antenna module 197 may include an antenna including a radiator made of a conductor or a conductive pattern formed on a substrate (eg, PCB). According to one embodiment, the antenna module 197 may include a plurality of antennas (eg, an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network such as the first network 198 or the second network 199 is connected to the plurality of antennas by, for example, the communication module 190. can be selected. Signals or power may be transmitted or received between the communication module 190 and an external electronic device through the at least one selected antenna. According to some embodiments, in addition to the radiator, other components (eg, radio frequency integrated circuit (RFIC)) may be additionally formed as part of the antenna module 197.

According to one embodiment, the antenna module 197 may form a mmWave antenna module. According to one embodiment, a mmWave antenna module includes: a printed circuit board, an RFIC disposed on or adjacent to a first side (e.g., bottom side) of the printed circuit board and capable of supporting a designated high frequency band (e.g., mmWave band); and a plurality of antennas (e.g., array antennas) disposed on or adjacent to the second side (e.g., top or side) of the printed circuit board and capable of transmitting or receiving signals in the designated high frequency band. You can.

At least some of the components are connected to each other through a communication method between peripheral devices (e.g., bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and signal ( (e.g. commands or data) can be exchanged with each other.

According to one embodiment, commands or data may be transmitted or received between the electronic device 101 and the external electronic device 104 through the server 108 connected to the second network 199. Each of the external electronic devices 102 or 104 may be of the same or different type as the electronic device 101. According to one embodiment, all or part of the operations performed in the electronic device 101 may be executed in one or more of the external electronic devices 102, 104, or 108. For example, when the electronic device 101 needs to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device 101 may perform the function or service instead of executing the function or service on its own. Alternatively, or additionally, one or more external electronic devices may be requested to perform at least part of the function or service. One or more external electronic devices that have received the request may execute at least part of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device 101. The electronic device 101 may process the result as is or additionally and provide it as at least part of a response to the request. For this purpose, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology can be used. The electronic device 101 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing. In one embodiment, the external electronic device 104 may include an Internet of Things (IoT) device. Server 108 may be an intelligent server using machine learning and/or neural networks. According to one embodiment, the external electronic device 104 or server 108 may be included in the second network 199. The electronic device 101 may be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

An electronic device according to an embodiment of the present disclosure may be of various types. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, home appliance devices, or wireless earphones or ear buds. You can. Electronic devices according to embodiments of the present disclosure are not limited to the above-described devices.

An embodiment of this document and the terms used herein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various changes, equivalents, or substitutes for the embodiment. In connection with the description of the drawings, similar reference numbers may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the above items, unless the relevant context clearly indicates otherwise. As used herein, “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C”, and “A Each of phrases such as “at least one of , B, or C” may include any one of the items listed together in the corresponding phrase, or any possible combination thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish one component from another, and to refer to that component in other respects (e.g., importance or order) is not limited. One (e.g., first) component is said to be “coupled” or “connected” to another (e.g., second) component, with or without the terms “functionally” or “communicatively.” When mentioned, it means that any of the components can be connected to the other components directly (e.g. wired), wirelessly, or through a third component.

The term “module” used in one embodiment of this document may include a unit implemented in hardware, software, or firmware, and may be interchangeable with terms such as logic, logic block, component, or circuit, for example. can be used A module may be an integrated part or a minimum unit of the parts or a part thereof that performs one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

One embodiment of the present document is one or more instructions stored in a storage medium (e.g., built-in memory 136 or external memory 138) that can be read by a machine (e.g., electronic device 101). It may be implemented as software (e.g., program 140) including these. For example, a processor (e.g., processor 120) of a device (e.g., electronic device 101) may call at least one command among one or more commands stored from a storage medium and execute it. This allows the device to be operated to perform at least one function according to the at least one instruction called. The one or more instructions may include code generated by a compiler or code that can be executed by an interpreter. A storage medium that can be read by a device may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not contain signals (e.g. electromagnetic waves), and this term refers to cases where data is semi-permanently stored in the storage medium. There is no distinction between temporary storage cases.

According to one embodiment, a method according to an embodiment disclosed in this document may be provided and included in a computer program product. Computer program products are commodities and can be traded between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium (e.g. compact disc read only memory (CD-ROM)), or through an application store (e.g. Play Store ^TM ) or on two user devices (e.g. It can be distributed (e.g. downloaded or uploaded) directly between smart phones) or online. In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

According to one embodiment, each component (e.g., module or program) of the above-described components may include a single or multiple entities, and some of the multiple entities may be separately placed in other components. . According to one embodiment, one or more of the above-described corresponding components or operations may be omitted, or one or more other components or operations may be added. Alternatively or additionally, multiple components (eg, modules or programs) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each component of the plurality of components identically or similarly to those performed by the corresponding component of the plurality of components prior to the integration. . According to one embodiment, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or , or one or more other operations may be added.

Figure 2 is a block diagram 200 of the audio module 170, according to one embodiment. Referring to FIG. 2, the audio module 170 includes, for example, an audio input interface 210, an audio input mixer 220, an analog to digital converter (ADC) 230, an audio signal processor 240, and a DAC. (digital to analog converter) 250, an audio output mixer 260, or an audio output interface 270.

The audio input interface 210 is a part of the input module 150 or is configured separately from the electronic device 101 to obtain audio from the outside of the electronic device 101 through a microphone (e.g., dynamic microphone, condenser microphone, or piezo microphone). An audio signal corresponding to sound can be received. For example, when an audio signal is received from an external electronic device 102 (e.g., a headset or microphone), the audio input interface 210 is directly connected to the external electronic device 102 through the connection terminal 178. Audio signals can be received by connecting (e.g., wired) or wirelessly (e.g., Bluetooth communication) through the wireless communication module 192. According to one embodiment, the audio input interface 210 may receive a control signal (eg, a volume adjustment signal received through an input button) related to the audio signal obtained from the external electronic device 102. The audio input interface 210 includes a plurality of audio input channels and can receive different audio signals for each corresponding audio input channel among the plurality of audio input channels. According to one embodiment, additionally or alternatively, the audio input interface 210 may receive an audio signal from another component of the electronic device 101 (eg, the processor 120 or the memory 130).

The audio input mixer 220 may synthesize a plurality of input audio signals into at least one audio signal. For example, according to one embodiment, the audio input mixer 220 may synthesize a plurality of analog audio signals input through the audio input interface 210 into at least one analog audio signal.

The ADC 230 can convert analog audio signals into digital audio signals. For example, according to one embodiment, the ADC 230 converts the analog audio signal received through the audio input interface 210, or additionally or alternatively, the analog audio signal synthesized through the audio input mixer 220 into a digital audio signal. It can be converted into a signal.

The audio signal processor 240 may perform various processing on a digital audio signal input through the ADC 230 or a digital audio signal received from another component of the electronic device 101. For example, according to one embodiment, the audio signal processor 240 may change the sampling rate, apply one or more filters, process interpolation, amplify or attenuate all or part of the frequency band, and You can perform noise processing (e.g., noise or echo attenuation), change channels (e.g., switch between mono and stereo), mix, or extract specified signals. According to one embodiment, one or more functions of the audio signal processor 240 may be implemented in the form of an equalizer.

The DAC 250 can convert digital audio signals into analog audio signals. For example, according to one embodiment, DAC 250 may process digital audio signals processed by audio signal processor 240, or other components of electronic device 101 (e.g., processor 120 or memory 130). The digital audio signal obtained from )) can be converted to an analog audio signal.

The audio output mixer 260 may synthesize a plurality of audio signals to be output into at least one audio signal. For example, according to one embodiment, the audio output mixer 260 may output an audio signal converted to analog through the DAC 250 and another analog audio signal (e.g., an analog audio signal received through the audio input interface 210). ) can be synthesized into at least one analog audio signal.

The audio output interface 270 transmits the analog audio signal converted through the DAC 250, or additionally or alternatively, the analog audio signal synthesized by the audio output mixer 260 through the electronic device 101 through the audio output module 155. ) can be output outside of. The sound output module 155 may include, for example, a speaker such as a dynamic driver or balanced armature driver, or a receiver. According to one embodiment, the sound output module 155 may include a plurality of speakers. In this case, the audio output interface 270 may output audio signals having a plurality of different channels (eg, stereo or 5.1 channels) through at least some of the speakers. According to one embodiment, the audio output interface 270 is connected to the external electronic device 102 (e.g., external speaker or headset) directly through the connection terminal 178 or wirelessly through the wireless communication module 192. and can output audio signals.

According to one embodiment, the audio module 170 does not have a separate audio input mixer 220 or an audio output mixer 260, but uses at least one function of the audio signal processor 240 to generate a plurality of digital audio signals. At least one digital audio signal can be generated by synthesizing them.

According to one embodiment, the audio module 170 is an audio amplifier (not shown) capable of amplifying an analog audio signal input through the audio input interface 210 or an audio signal to be output through the audio output interface 270. (e.g., speaker amplification circuit) may be included. According to one embodiment, the audio amplifier may be composed of a module separate from the audio module 170.

LE electronic devices with Bluetooth Core Version 5.2 or higher can support LE audio services through the BIS (broadcast isochronous stream) method or the CIS (connected isochronous stream) method.

Various embodiments of the present disclosure relate to the BIS method among audio services that can be provided between Bluetooth Low Energy (or LE) electronic devices. BIS is a Non Acknowledgment protocol, so it may be difficult to secure reliability when transmitting and receiving data. . To solve this, BIS has a protocol to solve reliability when transmitting and receiving data by increasing the number of retransmissions for the same PDU. In this case, since the same PDU must be retransmitted multiple times, resources to be allocated for coexistence with WiFi or BT concurrency may be wasted. In addition, mandatory retransmission can result in significant current consumption of electronic devices, and since it is impossible to accurately respond to the surrounding environment, a fixed bit rate must be maintained, which may result in loss of data transmission rate.

Various embodiments of the present disclosure divide transmitted BIS Audio PDUs by specific criteria to ensure reliability when transmitting and receiving data through BIS, and group specific PDUs with different properties (e.g., different bitrates, data rates, and/or other By operating with (transmission power), high reliability can be secured and at the same time, usability such as improving sound quality or preventing sound interruption can be provided to users. In the present disclosure, bit rate may refer to the data size in bits that must be processed per second. For example, the unit of bit rate can be 'bit per second (bps)'.

Figure 3 shows an example of operation of a plurality of electronic devices according to an embodiment.

Referring to FIG. 3, the first electronic device 300 is implemented as a portable communication device (e.g., a smartphone), and each of the second to seventh electronic devices 310 to 360 includes a speaker. It may be implemented as an electronic device (e.g., wireless earphones, audio devices, Bluetooth speakers, home appliances, wearable devices, smart watches, and/or smart rings).

According to one embodiment, the second electronic device 310 and the third electronic device 320 may be implemented as a pair of wireless earphones worn on the user's left and right ears, respectively. According to one embodiment, the fourth electronic device 330 and the fifth electronic device 340 may be implemented as a pair of wireless earphones worn on the user's left and right ears, respectively. According to one embodiment, the sixth electronic device 350 and the seventh electronic device 360 may be implemented as a pair of wireless earphones worn on the user's left and right ears, respectively.

The first electronic device 300 can broadcast audio data using the BIS method. According to one embodiment, the second electronic device 310, the third electronic device 320, the fourth electronic device 330, the fifth electronic device 340, the sixth electronic device 350, and the seventh electronic device At least one of the devices 360 may receive audio data broadcast from the first electronic device 300.

The first electronic device 300 may broadcast setting information necessary for other electronic devices to receive audio data. According to one embodiment, the second electronic device 310, the third electronic device 320, the fourth electronic device 330, the fifth electronic device 340, the sixth electronic device 350, and the seventh electronic device At least one of the devices 360 may receive audio data based on setting information broadcast from the first electronic device 300. According to one embodiment, when the second electronic device 310 and the third electronic device 320 operate as a pair, one of the second electronic device 310 and the third electronic device 320 is the first electronic device. Audio data can be received based on setting information broadcast from the electronic device 300.

Figure 4 is a diagram for explaining a BIG event and a BIS event according to an embodiment. The broadcast method can allow data to be streamed from a single source (or source electronic device) to multiple sinks (or sink electronic devices) using a group of synchronized streams. Each stream used in the broadcast method may be referred to as a broadcast isochronous stream (BIS), and a group of BIS may be referred to as a broadcast isochronous group (BIG).

BIS logical transport can be used to transmit one or more isochronous data streams to any device for BIS within a range (e.g., within a certain distance). BIS may include one or more subevents for transmitting isochronous data packets. BIS can support the transmission of multiple isochronous data packets in all BIS events.

Referring to FIG. 4, BIG event x includes BIS event x, and specific isochronous data may be transmitted within BIS event x. ISO_Interval represents the time between two adjacent BIG Anchor points, and Sub_Interval represents the time between the start of two consecutive subevents of each BIS. According to one embodiment, BIG event x may include at least one BIS event x, and BIS event x may include at least one subevent.

A BIS event may consist of one or more BIS PDUs (410, 420, 430). Link Layer can transmit BIS PDU only in BIG events. Link Layer can only transmit BIS PDU as part of a BIG Event. Each BIG event can be divided into BIS events and control subevents divided by Num_BIS. According to one embodiment, when the source electronic device determines that channel information needs to be changed, it may transmit a control subevent including the changed channel information 440. According to one embodiment, the source electronic device may not transmit a control subevent if channel information change is not necessary. According to one embodiment, the source electronic device may transmit a control subevent when it determines that BIG termination is necessary. Each BIS event may be divided into NSE subevents. Each BIS event starts at a moment called the BIS Anchor point and can end after the last subevent. Each BIG event starts at a moment called the BIG Anchor point and ends after that, if there is a control subevent. If there is no control subevent, it may end at the last BIS event. BIG Anchor points can be spaced regularly at ISO_Interval intervals. The BIS Anchor point for BIS n of BIG must be (n - 1) * BIS_Spacing after the BIG Anchor point, and can be spaced regularly by ISO_Interval. The subevents of each BIS can be spaced apart by Sub_Interval. Isochronous Broadcaster can end the BIG event at least before T_IFS at the BIG Anchor point of the next BIG event.

BIS does not have an Acknowledgment protocol, and traffic can be transmitted unidirectionally from a broadcasting device. BIS logical transport does not have Acknowledgment, and to improve transmission reliability, isochronous data packets can be retransmitted by increasing the number of subevents within every event.

BIS supports LE-S or LE-F logical links and can also support LEB-C (low energy broadcast control) logical links. BIS can be identified by unique access address and timing information. Access address and timing information can be transmitted in packets transmitted using the associated Periodic Advertising Broadcast (PADVB) logical transport. A scanning device that supports the Synchronized Receiver role function can receive isochronous data within BIS after synchronizing to BIS using timing information from the periodic advertising train. .

Each BIS is part of a BIG, and a BIG may contain one or more BIS. Multiple BISs within the BIG have a common timing reference based on the broadcaster and can be temporally synchronized. For example, the left and right channels of an audio stereo stream received by separate devices need to be rendered simultaneously. Multiple BISs within a BIG can be scheduled sequentially or in an interleaved arrangement.

In order for an electronic device to receive BIS, the Link Layer may need to obtain BIG information (BIGInfo) that describes the streams. BIG information (BIGInfo) can be obtained from additional controller advertising data (ACAD) of periodic advertising.

If the PHY field of the BIG information (BIGInfo) is not supported by the Link Layer or is RFU (reserved for future use), the Link Layer ignores the BIG information (BIGInfo) and does not enter the Synchronization state for the BIG specified in the BIG information (BIGInfo). It may not be possible. In this state, the Link Layer may need to listen to isochronous channel indices for the BIS Data PDUs that make up the BIG specified in BIG information (BIGInfo). In the Synchronizing sub-state, if the Link Layer does not receive BIS Data PDU within 6 BIG events, it can notify the Host starting with the first BIG event heard and transition to Standby state. When in a Synchronized sub-state, the Link Layer may have to listen to the Isochronous Broadcaster at least once in six consecutive BIS events. Electronic devices should not attempt to synchronize to a BIG that has the same associated periodic advertising train as a BIG that has already been synchronized.

A device synchronized to BIG can also be called a Synchronized Receiver. The Synchronized Receiver may, but is not required to, be synchronized to a periodic advertising train. When requested by the Host, the Link Layer may be required to report isochronous data received from the BIS Data PDU that constitutes the BIG to the Host. The host can specify that only data from a specific BIS within the BIG be reported. Link Layer can listen to and operate the contents of the new BIG Control PDU. The Link Layer does not need to listen for Broadcast Isochronous PDUs, which are retransmissions of PDUs that have already been successfully received, or BIS Data PDUs, which will not report data to the Host, except when necessary to maintain synchronization with the Isochronous Broadcaster's Clock. The Link Layer may need to perform window widening while listening. Link Layer can listen only until bisPayloadCounter is not greater than 2^29-1.

The Link Layer may need to enter the Isochronous Broadcasting state when instructed by the Host, if the Host can schedule a BIG requesting transmission. In this state, the Link Layer can transmit the BIS PDU as follows. The Link Layer may need to notify the Host when it transmits the first BIS data PDU. In this state, the Host can disable and subsequently re-enable periodic advertising trains associated with BIG. Each instance of the Link Layer state machine in the Isochronous Broadcasting state may need to transmit a BIG consisting of one or more BIS. Each BIS can transmit a separate isochronous data flow. There can be up to 31 BIS in a BIG.

Each BIG may have the following parameters defined.

- Num_BIS is the number of BISs in BIG. BISs in BIG can each be assigned a different BIS_Number from 1 to Num_BIS.

- ISO_Interval is the time between two adjacent BIG Anchor points (for example, in units of 1.25ms). For example, the ISO_Interval value can be between 4 and 3200. (5ms ~ 4s)

- BIS_Spacing is the time between the start time of the corresponding subevent in adjacent BISs in the BIG, the start time of the first subevent of the last BIS, and the control subevent.

- Sub_Interval is the time between the start of two consecutive subevents of each BIS.

- Max_PDU is the maximum number of data octets (excluding MIC) that can be transmitted for each BIS Data PDU in BIG. For example, the Max_PDU value is between 1 and 251.

- Max_SDU is the maximum size of the SDU (service data unit) of this BIG. For example, the Max_SDU value is between 1 and 4095.

Max SDU refers to the maximum size of data that can be transmitted. For example, assuming that Max SDU is 120 bytes and ISO Interval is 10 ms, the bit rate can be 96 kbps (120 byte = 960 bit, 96,000 bit/second => 96 kbps).

- MPT (max PDU transmission time) must be the same as the time it takes to transmit a packet containing BIS Data PDU along with the payload of Max_PDU octet in the PHY used for BIS, and assumes S=8 in LE Coded PHY.

- BN, PTO, and IRC control what data is transmitted in each BIG event. The value of BN must be between 1 and 7. The value of PTO must be between 0 and 15. The value of IRC must be between 1 and 15.

- NSE (number of subevent) is the number of subevents per BIS in each BIG event. This value must be between 1 and 31 and must be an integer multiple of BN.

- Framed indicates whether the BIG delivers framed or unframed data.

- Encrypted indicates whether the BIG is encrypted.

These parameters do not change during the lifetime of BIG. The required range of each parameter is the entire range of valid values excluding the following parameters, and only the values listed are required.

-Num_BIS: 1

- BN: 1

- NSE: all supported values of BN

- PTO: 0

- IRC: all supported values of GC

Each BIG must have a 39-bit counter, bigEventCounter, associated with it. This value is set to 0 for the first BIG event in the BIG, and is incremented by 1 for each BIG event, regardless of whether the Isochronous Broadcaster transmits Broadcast Isochronous PDUs during the event. Each BIS must have a 39-bit counter bisPayloadCounter associated with it. The Link Layer of Isochronous Broadcaster and Synchronized Receiver must be terminated before bisPayloadCounter is 2^39-1. For reference, when a BIG event starts, all BISs in BIG have the same value for bisPayloadCounter, and bigEventCounter * BN = bisPayloadCounter.

FIG. 5A shows an example of BIS with a sequential arrangement according to an embodiment, and FIG. 5B shows an example of BIS with an interleaved arrangement according to an embodiment.

BIS in BIG can be arranged sequentially or interleaved by appropriately setting the values of Sub_Interval and BIS_Spacing parameters. BIS subevents are an opportunity for the Isochronous Broadcaster to transmit the Broadcaster Isochronous BIS PDU and for the Synchronized Receiver to receive it.

Referring to Figure 5a, an example is shown in which BIGs with Num_BIS=2 and NSE=2 are arranged sequentially. BIG event x contains BIS1 event x and BIS2 event x sequentially, BIS1 event x contains BIS1 Event x Subevt 1 and BIS1 Event x Subevt 2, and BIS2 event x contains BIS2 Event x Subevt 1 and BIS2 Event x Subevt May include 2. According to one embodiment, in the case of a sequential array, BIS_Spacing must be greater than or equal to NSE * Sub_Interval, so all subevents of the BIS Event can occur together.

Referring to FIG. 5b, an example is shown in which BIGs with Num_BIS=2 and NSE=2 are arranged interleaved. BIG event x may alternately include BIS1 event x and BIS2 event x. BIG event x may include BIS1 Event x Subevt 1, BIS2 Event x Subevt 1, BIS1 Event x Subevt 2, and BIS2 Event x Subevt 2 in chronological order. According to one embodiment, in the case of an intersecting array, Sub_Interval must be Num_BIS * BIS_Spacing, and the first subevent of all BISs may be adjacent, and then the second subevent of all BISs may be adjacent. In each case it may be necessary to use the minimum value for BIS_Spacing.

Referring to FIGS. 5A and 5B, the maximum possible length for the data portion (excluding the control subevent) of the BIG event may be indicated as BIG_Sync_Delay. The value of BIG_Sync_Delay may be equal to the time from the Anchor point to BIG Synchronization, which is the end of the packet containing the payload of the Max_PDU octet transmitted in the last subevent.

BIG_Sync_Delay is equal to (Num_BIS - 1) * BIS_Spacing + (NSE - 1) * Sub_Interval + MPT. For example, the Link Layer must transmit one BIC Data PDU at the start of each subevent of an isochronous broadcasting event, unless there are scheduling conflicts. According to one embodiment, at least one BIS PDU may be transmitted within six consecutive BIS events. If a PDU fails to be transmitted, the Link Layer may have to pretend that all other purposes (packet timing, selection of payload) have been completed.

For each BIS event, the data source must supply a data burst consisting of BN (burst number) payloads, and each data may contain a single fragment or one or more SDU segments. This burst is associated with the corresponding BIS event, but can also be transmitted in earlier events. Each PDU containing a given payload has the same link layer identifier (LLID) value, but may have different CSSN and CSTF. For reference, the burst associated with the BIS event can be composed of payloads of bisPayloadCounter between bigEventCounter * BN and (bigEventCounter + 1) * BN - 1.

The subevents of each BIS event can be divided into groups of BN subevents, respectively. Therefore, GC (Group Count) groups may be GC = NSE / BN.

IRC (immediate repetition count) can specify the number of groups carrying data related to the current BIS event. The remaining group may carry data related to the BIS event specified by the pre-transmission offset (PTO). IRC must be greater than 0 and not greater than GC. If IRC = GC, PTO should be ignored. Otherwise, PTO must be greater than 0.

Groups of Subevents are numbered sequentially using g from 0 to GC - 1.

- If g < IRC, group g must include data related to the current BIS event.

- If g >= IRC, group g must contain data related to the future BIS event of the PTO * (g - IRC + 1) BIS event after the current BIS event.

The payload of each burst must always be transmitted in the same order.

For reference, setting GC to a value greater than 1 provides redundant transmission to compensate for the lack of Acknowledgment during broadcast, while setting PTO to a value other than 0 (pre_transmission) provides large time diversity of redundant copy of data. You can.

Figures 6A to 6C each show an example of payload allocation within BIS according to one embodiment.

Figure 6a shows payload allocation in BIS with the characteristics of BN=2, IRC=2, PTO=0, NSE=4. Since BN=2, payloads p0 and p1 can be transmitted in BIS event(x), and since IRC=2, payloads p0 and p1 can be transmitted one more time in BIS event(x) (retransmission of burst). Since PTO=0, data related to the BIS event transmitted later in BIS event(x) may not be transmitted in advance. BIS event(x) includes payloads p0, p1, p0, p1 in chronological order, and p0 and p1, which are repeatedly transmitted, are retransmission of burst. BIS event (x+1) includes payloads p2, p3, p2, p3 in chronological order, and p2 and p3, which are repeatedly transmitted, are retransmission of burst. In Figure 6a, since PTO=0, data related to the current BIS event is repeatedly transmitted in each BIS event, and data related to the BIS event transmitted later may not be transmitted in advance.

Figure 6b shows payload allocation in BIS with the characteristics of BN=1, IRC=3, PTO=2, NSE=5. Since BN=1, payload p0 can be transmitted in BIS event(x), and since IRC=3, payload p0 can be transmitted three times in BIS event(x) (retransmission of burst). Since BN=1, PTO=2, NSE=5, in BIS event(x), payload p2 related to BIS event(x+2) and payload p4 related to BIS event(x+4) can be transmitted in advance. BIS event x contains payloads p0, p0, p0, p2, p4 in chronological order, p0 is data related to the current BIS event (Event x), p2 is related to BIS event (Event x+2), and BIS This is data transmitted in advance at event (Event x), and p4 is related to the BIS event (Event x+4) and may be data transmitted in advance at BIS event (Event x). The start time of the BIS event (Event x+2) may be 2 intervals (ISO_Interval) after the start of the BIS event (Event x). The start time of the BIS event (Event x+4) may be 4 intervals (ISO_Interval) after the start of the BIS event (Event x).

From BIS event (x+1), payload p1 is transmitted three times (retransmission of burst), and from BIS event (x+1), payload p3 and BIS event (x+5) related to BIS event (x+3) are transmitted. The payload p5 related to may be transmitted in advance.

Figure 6c shows payload allocation in BIS with the characteristics of BN=2, IRC=2, PTO=4, NSE=6. Since BN=2, payload p0, p1 can be transmitted in BIS event(x), and since IRC=2, payload p0, p1 can be transmitted one more time in BIS event(x) (retransmission of burst). Since BN=2, PTO=4, and NSE=6, payloads p8 and p9 related to BIS event(x+4) can be transmitted in BIS event(x). BIS event x includes payloads p0, p1, p0, p1, p8, p9 in chronological order, p0, p1 are data related to the current BIS event (Event x) and can be transmitted repeatedly, and p8, p9 are BIS This may be data related to event (Event x+4).

Figure 7 shows an example of a BIG including two BISs in a sequential arrangement according to one embodiment.

Referring to FIG. 7, BIG event may include BIS1 event x, BIS 2 event x, and control subevent, BIS1 event x may include two BIS1, and BIS2 event x may include two BIS2. The Link Layer can transmit control information about the BIG by transmitting a single BIG Control PDU when the Control Subevent starts. Link Layer does not transmit BIG Control PDU at any other time. In this disclosure, control information for BIG may be transmitted in Control Subevent. According to one embodiment, a first electronic device (eg, source electronic device) may transmit control information about BIG to a second electronic device (eg, sink electronic device) in a control subevent.

The time from the BIG anchor point specified by BIG_Control_Offset to the start of the Control subevent is as follows.

BIG_Control_Offset = Num_BIS * BIS_Spacing for Sequential

BIG_Control_Offset = NSE * Sub_Interval for Interleaved

Figure 8a shows an example of the Isochronous Physical Channel PDU format according to one embodiment.

Isochronous Physical Channel PDU has a 16-bit Header and can have a payload of variable size that may include a MIC field. The format of the Header field and Payload may vary depending on the type of Isochronous Physical Channel PDU in use.

When used in CIS, the Isochronous Physical Channel PDU may be in the form of a Connected Isochronous PDU. When used in BIS, the Isochronous Physical Channel PDU may be in the form of a Broadcast Isochronous PDU. The MIC field is a 4-byte field included in all non-zero size PDUs transmitted from encrypted CIS or BIS. The MIC field must not be transmitted to CIS or BIS unencrypted or included in a PDU with a payload of length 0.

Figure 8b shows an example of a Broadcast Isochronous PDU Header according to an embodiment, and Figure 8c shows an example of a Broadcast Isochronous PDU Header flag according to an embodiment.

Broadcast Isochronous PDU (BIS PDU) can be implemented as BIS Data PDU or BIG Control PDU. BIS Data PDU can be used to transport isochronous data, and BIG Control PDU can be used to transmit BIG control information.

Referring to Figures 8b and 8c, the Broadcast Isochronous PDU Header may include an LLID field, a control subevent sequence number (CSSN) field, a control subevent transmission flag (CSTF) field, a reserved for future use (RFU) field, and a Length field. You can.

The LLID field may indicate the content type of the payload field of the PDU. For example, 0b00 is Unframed BIS data PDU; end indicates fragment of an SDU or a complete SDU, and 0b01 is Unframed BIS data PDU; Indicates start or continuation fragment of an SDU, and 0b10 is Framed BIS data PDU; One or more segments of an SDU can be indicated, and 0b11 can indicate a BIG control PDU.

If the Length field is included, the Length field may indicate the size of the payload and MIC in octet units.

FIG. 8D shows an example of BIG Control PDU Payload format according to an embodiment, and FIG. 8E shows an example of BIG Control PDU Opcodes according to an embodiment.

BIG Control PDU can be identified by Opcode. The CrtData field in the BIG Control PDU is designated by the Opcode field, and in the case of the Opcode below, the length of the CtrData field can be fixed.

For example, if the opcode is 0x00, the BIG Control PDU is BIG_CHANNEL_MAP_IND, if the opcode is 0x01, the BIG Control PDU is BIG_TERMINATE_IND, and if the opcode is All other values, the BIG Control PDU may be RFU (reserved for future use).

Figure 9 shows an example of the BIG information (BIGInfo) format according to one embodiment.

When scheduling a BIG Control PDU to be transmitted in a BIG Event, the Link Layer sets the Control Subevent Sequence Transmission Flag (CSTF) bit to 1 in the header of all BIS Data PDUs transmitted in the BIG Event. Otherwise, the bit is set to 0. CSTF bit can be set to 0 in the header of all BIG Control PDUs. The Control Subevent Sequence Number (CSSN) value of all BIS PDUs in a BIG Event must be the same. The Link Layer may increment the CSSN by 1 when a BIG Event that includes the initial transmission of a new BIG Control PDU begins (for example, if the BIG Control PDU is being retransmitted or is not scheduled to be transmitted) and may not change the CSSN. According to one embodiment, the Synchronized Receiver may use the CSSN to determine that the BIG Control PDU is a retransmission of a PDU that has already been received. The length of BIGInfo can be 33 octets for unencrypted BIG and 57 octets for encrypted BIG.

Referring to FIG. 9, BIG information (BIGInfo) includes a BIG_Offset field, BIG_Offset_Units field, ISO_Interval field, Num_BIS field, NSE field, BN field, Sub_Interval field, PTO field, BIS_Spacing field, IRC field, Max_PDU field, RFU field, and SeedAccessAddress field. , SDU_Interval field, Max_SDU field, BaseCRClnit field, ChM field, PHY field, bisPayloadCount field, Framing field, GIV field, and GSKD field.

The BIG_Offset field may include the time from the start of the packet containing BIGInfo to the next BIG anchor point. The value of the BIG_Offset field may be the time unit indicated by the BIG_Offset_Units bit.

Each value can be included in the ISO_Interval, NSE, BN, Sub_Interval, PTO, BIS_Spacing, and IRC fields. Sub_Interval and BIS_Spacing can be in micro second units. The Num_BIS field may include the number of BIS in BIG. The Max_PDU field may include the Max duration of the PDU. The SeedAccessAddress field may include the Seed Access Address for BIG.

SDU_Interval may include the SDU interval value. The Max_SDU field may include the Max duration of the SDU. The ChM field in the BaseCRCInit field may have the same meaning as the corresponding field in the COONECT_IND PDU. The PHY field can be set to indicate the PHY used by BIG.

The bisPayloadCount field can contain a value. The value may be for the first subevent of the BIG event mentioned in the BIG_Offset field. If BIG delivers framed data, framing bit may be set. If BIG is encrypted, the GIV and GSKD fields may contain the values described in Encryption.

Figure 10 shows an example of a time reference of a BIG event from a periodic advertising event according to an embodiment.

Referring to FIG. 10, the BIG_Offset field may include the time from the start of a packet containing BIGInfo to the next BIG anchor point. The value of the BIG_Offset field may be the time unit indicated by the BIG_Offset_Units bit. The actual time offset can be determined by multiplying the BIG_Offset value by the unit. Offset can be greater than 600 micro second. If the BIG_Offset_Units bit is set, the units are 300 micro seconds, otherwise they can be 30 micro seconds. The BIG_Offset_Units bit may not be set if the offset is less than 491,460 micro seconds. The BIG anchor point may be within offset and offset plus 1 unit after the start of the corresponding packet.

In various embodiments of the present disclosure, a BIS source electronic device transmits BIS audio data with fixed operating attributes including a fixed bit rate and fixed transmission power to perform a BIS service, and transmits some portions according to a preset standard. Variable attributes including variable bitrate and variable transmission power can be applied to the PDU. When the BIS source electronic device applies variable attributes to some PDUs, the current consumption of the BIS source electronic device can be reduced and the required resources can be reduced at the same time. When the BIS source electronic device applies variable properties to some PDUs, the success rate of audio data reception of the BIS sink electronic device can be increased, the current consumption due to unnecessary Rx open can be improved, and sound interruption can be reduced to provide better user experience. We can provide stable service.

When performing a broadcast audio service according to the user's intention or a set policy, the BIS source electronic device may periodically advertise information (or BIG information) about the BIS.

The BIS source electronic device may transmit BIS audio data based on fixed attributes including fixed bitrate and fixed transmission power. The BIS sync electronic device can receive BIS audio data transmitted with fixed attributes using information about BIS (or BIG information) included in periodic advertising. The BIS sync electronic device can check (or calculate) the channel (CH) and transmission time through which BIS audio data is transmitted based on information about BIS (or BIG information), and use these to receive BIS audio data.

The BIS source electronic device may determine at least one PDU to which variable attributes including variable bitrate and variable transmission power will be applied based on at least one preset criterion.

Figure 11 is a flowchart showing the operation of a BIS source electronic device according to an embodiment. The BIS source electronic device of FIG. 11 may be implemented as the electronic device 101 of FIG. 1 or the first electronic device 300 of FIG. 3. The BIS sync electronic device of FIG. 11 includes the electronic device 102 of FIG. 1, the second electronic device 310, the third electronic device 320, the fourth electronic device 330, and the fifth electronic device 340 of FIG. ), the sixth electronic device 350, or the seventh electronic device 360.

In operation 1110, the BIS source electronic device may broadcast an advertising message including transmission information of BIS data. According to one embodiment, the transmission information of BIS data may include information (eg, Max_SDU field) related to the maximum value of the bit rate for BIS data. According to one embodiment, the transmission information of BIS data may include information related to the maximum value of transmission power for BIS data. According to one embodiment, the transmission information of BIS data may include information about the specified bit rate (eg, maximum bit rate) and designated transmission power (eg, maximum transmission power) to be applied to the BIS data. According to one embodiment, the BIS sync electronic device may receive transmission information of broadcast BIS data and perform synchronization with BIS.

In operation 1120, when the BIS service is started according to the user's intention or a set policy, the BIS source electronic device determines the bit rate and transmission power to be applied to the BIS data based on the transmission information of the BIS data broadcast in operation 1110. And, transmission of the BIS data can be started using the determined bit rate and transmission power. According to one embodiment, if the transmission information of BIS data includes information (e.g., Max_SDU field) related to the maximum value of the bit rate for BIS data, the bit rate to be applied to the BIS data is the maximum value of the bit rate. It can be set below this value. According to one embodiment, if the transmission information of BIS data includes information related to the maximum value of transmission power for BIS data, the transmission power to be applied to the BIS data may be set to less than or equal to the maximum value of transmission power. According to one embodiment, the BIS source electronic device may start transmitting BIS data based on a bit rate below the specified broadcast bit rate and a transmission power below the specified transmission power. According to one embodiment, the BIS sink electronic device may receive BIS data with properties determined based on transmission information of broadcast BIS data.

In operation 1130, the BIS source electronic device may divide the BIS data into two groups (or PDU groups) based on a preset criterion (eg, at least one of the BIS parameters). According to one embodiment, the BIS source electronic device sets all or part of the data related to the current BIS event to the first group in one interval and sets all or part of the data related to the BIS event specified by the PTO to the second group. It can be set to . According to one embodiment, the BIS source electronic device sets all or part of the audio data related to the current BIS event to a first group in one interval, and sets all or part of the control data related to the current BIS event to the second group. Can be set as a group. According to one embodiment, the BIS source electronic device may divide BIS data into two or more groups based on a preset standard (eg, at least one of BIS parameters).

In operation 1140, the BIS source electronic device may determine whether the BIS data belongs to the first group. If the BIS data belongs to the first group in operation 1140, in operation 1150, the BIS source electronic device broadcasts the first BIS data by applying the first properties (e.g., first bit rate and first transmission power). can do. According to one embodiment, the first attribute (e.g., first bit rate and/or first transmission power) is based on the maximum bit rate and/or maximum transmission power included in the advertising message. This can be decided. According to one embodiment, the first bit rate may be set below the maximum bit rate included in the advertising message. According to one embodiment, the first transmission power may be set below the maximum transmission power value included in the advertising message.

If in operation 1140 the BIS data does not belong to the first group (e.g., belongs to the second group), in operation 1160 the BIS source electronic device determines a second attribute (e.g., a second bit rate and/or a second group). 2 transmission power) can be applied to broadcast BIS data. According to one embodiment, the second attribute (e.g., second bit rate and/or second transmission power) is based on the maximum bit rate and/or maximum transmission power included in the advertising message. This can be decided. According to one embodiment, the second bit rate may be set to less than the maximum bit rate included in the advertising message and may be set to a value greater than the first bit rate. According to one embodiment, the first transmission power may be set to less than the maximum transmission power value included in the advertising message and may be set to a value smaller than the first bit rate.

According to one embodiment, when a BIS source electronic device generates one or more BIS within one BIG and performs a broadcast audio service, some data is transmitted with different attributes from the remaining data, thereby repeating BIS data. It reduces current consumption due to transmission and ensures transmission reliability even without an acknowledgment protocol.

Figure 12 shows an example in which an electronic device performs periodic advertising, according to an embodiment.

The BIS source electronic device may perform periodic advertising so that at least one BIS sink electronic device can receive corresponding BIS data.

Referring to FIG. 12, the BIS source electronic device may transmit ADV_EXT_IND PDU (A_E_I) at every designated Advertising interval (Adv interval). ADV_EXT_IND PDU (A_E_I) may include an Auxiliary Packet Point indicating the location of AUX_ADV_IND and channel information. AUX_ADV_IND (A_A_I) may include at least one of the Access Address of AUX_SYNC_IND (A_S_I), which may include BIG Info information, Channel map, Advertising Interval, Clock accuracy, and time offset from the currently transmitted AUX_ADV_IND. AUX_SYNC_IND (A_S_I) can start before the actual BIS data is transmitted, and when BIS data is transmitted, AUX_SYNC_IND (A_S_I) can be transmitted, including BIS Parameters and BIG Info containing transmission information of BIS Audio data. . In the present disclosure, BIG Info (or control information for BIG) may be transmitted and included in AUX_SYNC_IND (A_S_I). According to one embodiment, an electronic device (eg, a source electronic device) may broadcast AUX_SYNC_IND (A_S_I) including BIG Info (or control information for BIG).

FIGS. 13A and 13B each show examples of an electronic device transmitting BIS data according to an embodiment.

According to one embodiment, the BIS source electronic device distinguishes PDUs designated as PTO, which means PDUs transmitted in advance to ensure transmission reliability due to the absence of an Acknowledgment protocol, from general BIS data and has different properties (e.g., different data). rate, bit rate, and/or transmission power).

According to one embodiment, based on the transmission time, the BIS source electronic device includes at least one PDU to be transmitted in a first BIS event, and at least one PDU related to a second BIS event and transmitted in advance in the first BIS event. may be transmitted with different properties (e.g., different data rates, bit rates, and/or transmission power).

According to one embodiment, the BIS source electronic device may distinguish BIS audio data and BIS control data and transmit them with different attributes (e.g., different data rates, bit rates, and/or transmission power). .

Referring to FIG. 13A, when BN=1, IRC=2, PTO=2, NSE=3, the source electronic device transmits the first data related to the current BIS event and the pre-transmission offset (PTO) indicated. Different attributes (eg, different data rates, bit rates, and/or transmission power) may be applied to each of the second data related to the BIS event and transmitted. According to one embodiment, the source electronic device may broadcast a plurality of payloads in each of BIS event(x) to BIS event(x+5).

For example, in BIS event (x), “P0, P0” associated with BIS event (x) is transmitted as a first attribute (e.g., first bit rate and/or first transmission power), and BIS event ( “P2”, which is related to x+2) and is transmitted in advance in the BIS event (x), may be transmitted as a second attribute (eg, a second bit rate and/or a second transmission power). In BIS event (x+1), “P1, P1” related to BIS event (x+1) is transmitted as the first attribute, is related to BIS event (x+3), and is transmitted in advance in BIS event (x+1). “P3” may be transmitted as a second attribute. In BIS event (x+2), "P2, P2" related to BIS event (x+2) is transmitted as the first attribute, is related to BIS event (x+4), and is transmitted in advance in BIS event (x+2). “P4” may be transmitted as a second attribute.

Referring to FIG. 13b, when BIS=2, BN=2, IRC=2, PTO=2, NSE=6, data can be transmitted in three different attributes based on PTO. For example, within the first ISO interval (ISO_Interval), “L0, R0, L1, R1, L0, R0, L1, R1” is transmitted as the first attribute, “L4, R4” is transmitted as the second attribute, and , “L5, R5” may be transmitted as the third attribute.

FIGS. 14A to 14C each show examples of an electronic device transmitting BIS data according to an embodiment.

The electronic device can transmit BIS data based on information included in BIG information (BIG Info) transmitted through AUX_SYNC_IND. The electronic device uses at least one of the following methods included in BIG information: Num BIS, NSE, BN, Sub Interval, PTO, BIS Spacing, IRC, Max PDU, SDU Interval, Max SDU Size, Channel Map, PHY, and Framing. BIS data can be transmitted based on .

According to one embodiment, the electronic device may transmit BIS data with internally predefined transmission power. According to one embodiment, each BIS Parameter may vary depending on the type of BIS service to be performed. For example, when high-quality sound transmission is required, such as Media type, or when low-quality sound transmission is required, such as repetitive warning messages, it can be operated by subdividing it into various BIS parameters.

For example, in BIG Info, Num BIS=2, NSE=6, ISO Interval=20ms, IRC=2, PTO=2, Unframing, BIS Spacing=674μs, Sub Interval=1.348ms, SDU Interval=10ms, Max SDU If Size = 120 bytes and PHY LE = 2M are defined, and the transmission power is set to 14dBm, the electronic device can transmit BIS data with the corresponding BIS Parameter and transmission power. In this case, the BIS service can be performed on external electronic devices within an area that can be covered by 14dBm at a bit rate of 96kbps.

Figures 14a to 14c show examples of transmission of BIS audio data with BIS Num=2, BN=2, NSE=6, IRC=3, PTO=2, and ISO Interval 20ms. Referring to FIG. 14a, in BIS event 1, all or part of “L0, R0, L1, R1, L0, R0, L1, R1” related to the current BIS event is transmitted as the first attribute and indicated by the PTO. All or part of “L4, R4, L5, R5” related to the BIS event may be transmitted as the second attribute, and “CTR” may be transmitted as the third attribute. According to one embodiment, the source electronic device may transmit a CTR including channel information when the channel situation changes. In Figure 14a, all or part of “L0, R0, L1, R1, L0, R0, L1, R1” related to the current BIS event may be referred to as first BIS data and related to the BIS event indicated by the PTO. All or part of “L4, R4, L5, R5” may be referred to as second BIS data.

Referring to FIG. 14b, in BIS event 2, “L2, R2, L3, R3, L2, R2, L3, R3” related to the current BIS event is transmitted as the first attribute and related to the BIS event indicated by the PTO. “L6, R6, L7, R7” may be transmitted as the second attribute. Referring to Figure 14c, in BIS event 3, "L4, R4, L5, R5, L4, R4, L5, R5" related to the current BIS event is transmitted as the first attribute, and related to the BIS event indicated by the PTO “L8, R8, L9, R9” may be transmitted as the second attribute.

Figure 15A shows an example of payload transmission within BIS according to one embodiment.

Referring to Figure 15a, in BIS event (x), payload p0 and p1 may be transmitted with first attributes (e.g., first bit rate and first transmission power), and when IRC = 2, BIS event In (x), payloads p0 and p1 may be transmitted once again with the first attribute (eg, first bit rate and first transmission power) (retransmission of burst). When PTO=1 is set, payloads p2 and p3 to be transmitted in BIS event (x+1) will be transmitted in advance as second attributes (e.g., first bit rate and second transmission power) in BIS event (x). You can. According to one embodiment, payloads p2 and p3 transmitted in advance in BIS event (x) may be transmitted with higher transmission power and the same bit rate as payloads p0 and p1. In BIS event (x+1), payloads p2 and p3 may be transmitted with first attributes (e.g., first bit rate and first transmission power), and when IRC=2 is set, BIS event (x+1 ), payloads p2 and p3 may be transmitted once again with the first attribute (e.g., first bit rate and first transmission power) (retransmission of burst). When PTO=1 is set, the payloads p4 and p5 to be transmitted in the BIS event (x+2) are preset as second attributes (e.g., first bit rate and second transmission power) in BIS event (x+1). can be transmitted. According to one embodiment, payloads p4 and p5 transmitted in advance at BIS event (x+1) may be transmitted with higher transmission power than payloads p2 and p3.

Figure 15b shows an example of payload transmission within BIS according to one embodiment.

Referring to Figure 15b, in BIS event (x), payloads p0 and p1 may be transmitted with first attributes (e.g., first bit rate and first transmission power), and when IRC = 2, BIS event In (x), payloads p0 and p1 may be transmitted once again with the first attribute (eg, first bit rate and first transmission power) (retransmission of burst). When PTO=1 is set, payloads p2 and p3 to be transmitted in BIS event (x+1) will be transmitted in advance as second attributes (e.g., first bit rate and second transmission power) in BIS event (x). You can. According to one embodiment, payloads p2 and p3 transmitted in advance in BIS event (x) may be transmitted with lower transmission power and the same bit rate as payloads p0 and p1. In BIS event (x+1), payloads p2 and p3 may be transmitted with first attributes (e.g., first bit rate and first transmission power), and when IRC=2 is set, BIS event (x+1 ), payloads p2 and p3 may be transmitted once again with the first attribute (e.g., first bit rate and first transmission power) (retransmission of burst). When PTO=1 is set, the payloads p4 and p5 to be transmitted in the BIS event (x+2) are preset as second attributes (e.g., first bit rate and second transmission power) in BIS event (x+1). can be transmitted. According to one embodiment, payloads p4 and p5 transmitted in advance in the BIS event (x+1) may be transmitted with lower transmission power and the same bit rate as payloads p2 and p3. According to one embodiment, the data (or payload) to be transmitted in the current BIS event (x) is indicated by the PTO and has a higher transmission power than the data (or payload) previously transmitted in the BIS event (x). Once transmitted, the BIS source device can provide services for the current BIS event (x) to BIS sink devices through wider coverage.

FIGS. 15C and 15D each show an example in which an electronic device increases the bit rate and transmission power of some data, according to an embodiment.

The bit rates (96 kbps, 80 kbps) and transmission power (8 dBm, 12 dBm) shown in FIGS. 15C and 15D, respectively, are only examples for convenience of explanation, and the technical idea of the present disclosure is not limited thereto and the bit rate and transmission power Each can be set to various values depending on the implementation. For example, assuming that the PDU size is 120 bytes and the ISO Interval is 10 ms, the bit rate can be 96 kbps (120 byte = 960 bit, 96,000 bit/second => 96 kbps). The BIS parameter setting values shown in FIGS. 15C and 15D are only examples for convenience of explanation, and the technical idea of the present disclosure is not limited thereto, and the BIS parameter setting values may be set to various values depending on implementation.

The electronic device may transmit PDUs related to the current BIS event with a second attribute rather than a first attribute (eg, designated PDU size (or bitrate) and/or designated transmission power). According to one embodiment, when it is decided to transmit PDUs indicated by the PTO and transmitted in advance with different attributes, general BIS data may be transmitted as the first attribute, and data designated as the PTO may be transmitted as the second attribute. According to one embodiment, the first attribute may have a higher bitrate and/or transmission power compared to the second attribute. According to one embodiment, the first attribute may have a lower bit rate and/or transmission power compared to the second attribute.

Referring to Figure 15c, for example, when the BIS parameters are set to BIS Num=2, BN=2, NSE=6, IRC=2, PTO=2, the electronic device sends data designated as PTO ("L4, R4, L5, R5") at a higher bitrate (e.g., 96 kbps) and higher transmission power (e.g., 12dBm). This is a method that utilizes the characteristic that when BIS sync electronic devices receive pre-transmitted PDUs, they may not receive additionally retransmitted corresponding PDUs, so that BIS sync electronic devices have a higher reception success rate and maintain higher sound quality. to be able to be able to be able to do it. According to one embodiment, pre-transmitted data (“L4, R4, L5, R5”) designated as PTO is transmitted based on the first attribute (e.g., transmission power: 12dBm, PDU size: 120byte), and general BIS Data (“L0, R0, L1, R1, L0, R0, L1, R1”) may be transmitted based on the second attribute (e.g., transmission power: 8 dBm, PDU size: 80 bytes). According to one embodiment, the electronic device may transmit control data (CTR) with a third attribute different from the first attribute and the second attribute. According to one embodiment, the electronic device may transmit control data (CTR) based on the first attribute in the same way as previously transmitted data designated as PTO.

Referring to FIG. 15d, for example, when the BIS parameters are set to BIS Num=2, BN=2, NSE=6, IRC=2, and PTO=2, the electronic device sends data designated as PTO ("L4, R4, L5, R5") at a lower bit rate (e.g., 80 kbps) and lower transmission power (e.g., 8dBm). The purpose of this is to secure the flexibility of the internal scheduler by lowering the priority of PDUs designated as PTO and transmitted in advance in situations where the electronic device coexists with WiFi or BT concurrency. You can. According to one embodiment, data designated as PTO ("L4, R4, L5, R5") is transmitted based on the first attribute (e.g., transmission power: 8 dBm, PDU size: 80 bytes), and general BIS data (" L0, R0, L1, R1, L0, R0, L1, R1") may be transmitted based on the second attribute (e.g., transmission power: 12 dBm, PDU size: 120 bytes). According to one embodiment, the electronic device may transmit control data (CTR) with a third attribute different from the first attribute and the second attribute. According to one embodiment, the electronic device may transmit control data (CTR) based on the first attribute in the same way as previously transmitted data designated as PTO.

The PDU size (or bit rate) and transmission power shown in each of FIGS. 16 to 26B are only examples for convenience of explanation, and the technical idea of the present disclosure is not limited thereto, and each bit rate and transmission power vary depending on implementation. It can be set to various values. The BIS parameter setting values shown in FIGS. 16 to 26B are only examples for convenience of explanation, and the technical idea of the present disclosure is not limited thereto, and the BIS parameter setting values may be set to various values depending on implementation.

FIG. 16 shows examples of intervals when an electronic device increases the bit rate and transmission power of some data, according to an embodiment.

Referring to FIG. 16, for example, if the BIS parameters are set to BIS Num=2, BN=2, IRC=2, PTO=2, NSE=6, the electronic device will The data being transmitted (e.g. “L4, R4, L5, R5”) has a higher bitrate than regular BIS data (e.g. “L0, R0, L1, R1, L0, R0, L1, R1”). (e.g., 96 kbps) and higher transmit power (e.g., 12 dBm).

In the first interval, data designated as PTO and transmitted in advance ("L4, R4, L5, R5") is transmitted based on the first attribute (e.g., 12dBm and 120byte), and general BIS data ("L0, R0 , L1, R1, L0, R0, L1, R1") may be transmitted based on the second attribute (eg, 8dBm and 80byte). In the second interval, data designated as PTO and transmitted in advance ("L6, R6, L7, R7") is transmitted based on the first attribute (e.g., 12dBm and 120byte), and general BIS data ("L2, R2 , L3, R3, L2, R2, L3, R3") may be transmitted based on the second attribute (eg, 8dBm and 80byte). In the third interval, data designated as PTO and transmitted in advance (“L8, R8, L9, R9”) is transmitted based on the first attribute (e.g., 12dBm and 120byte), and general BIS data (“L4, R4”) , L5, R5, L4, R4, L5, R5") may be transmitted based on the second attribute (eg, 8dBm and 80byte).

FIG. 17 illustrates an example in which an electronic device adjusts the bit rate and transmission power of general BIS data when data transmission related to PTO fails, according to an embodiment.

Referring to FIG. 17, for example, when the BIS parameters are set to BIS Num=2, BN=2, IRC=2, PTO=2, NSE=6, the electronic device (or BIS source electronic device) If transmission of data (“L4, R4, L5, R5”) designated as PTO and transmitted in advance fails, the electronic device transmits “L4, R4, L5, R5” that failed to be transmitted in the first interval to the first interval. It can be transmitted as general BIS data in the third interval by applying the properties (bit rate and transmission power) set for the data specified by the PTO in .

According to one embodiment, the electronic device may additionally adjust the bit rate and/or transmission power when it is expected that a situation in which certain PDUs cannot be transmitted will occur. For example, when transmitting data designated as PTO with priority, CIS transmission may not be possible if coexistence with WiFi and BT concurrency higher than CIS at that point in time occurs. In this case, PDUs that were not transmitted as data designated as PTO can be transmitted with the attributes applied to data designated as PTO at the time of normal transmission. This may be to maintain the intended high sound quality and/or high power attributes for data designated as PTO.

According to one embodiment, the electronic device may change the PDU of the PTO that failed to transmit from the attribute that was intended to be transmitted to the PTO (for example, change the bit rate and/or transmission power) and transmit it at the normal transmission time. According to one embodiment, the electronic device may repeatedly and gradually increase some of the attributes (for example, bit rate and/or transmission power) of the PDU of the PTO that failed to transmit. According to one embodiment, the electronic device may repeatedly and gradually lower some of the attributes (bit rate and/or transmission power) of the PDU of the PTO that failed to transmit.

According to one embodiment, an external electronic device may not receive all BIS data transmitted by the electronic device, but may receive only some BIS data. For example, if an external electronic device normally receives a specific PDU transmitted in advance through PTO, it may not open Rx for the corresponding subevent within the ISO Interval in which the PDU is transmitted. An external electronic device may not always receive BIS data of the same bit rate depending on the electronic device's BIS data transmission.

According to one embodiment, when the electronic device transmits the PTO at a high bit rate and high transmission power prioritizing the PTO group and transmits general BIS data at a low bit rate and low transmission power, the external electronic device determines that the channel condition is good. Since PDUs transmitted to the PTO can be normally received in a (clean) environment, high bit rate BIS data can be received and high-quality audio can be output. According to one embodiment, since it is difficult for an external electronic device to normally receive PDUs transmitted to the PTO in a busy environment, it receives general BIS data and receives low bitrate BIS data, but the sound is interrupted. It may not occur.

Figure 18 shows an example of an electronic device transmitting BIS data according to an embodiment.

Referring to FIG. 18, for example, when the BIS parameters are set to BIS Num=2, BN=2, IRC=2, PTO=2, NSE=6, the electronic device is designated as PTO within one interval and The data being transmitted (e.g. “L4, R4, L5, R5”) has a higher bitrate than regular BIS data (e.g. “L0, R0, L1, R1, L0, R0, L1, R1”). and can be transmitted with higher transmission power.

FIG. 19A shows an example of an electronic device selectively receiving BIS data in an environment with a good channel condition (clean) according to an embodiment, and FIG. 19B shows an example of an electronic device in an environment with a good channel condition (clean) according to an embodiment. shows an example of a reception buffer when selectively receiving BIS data.

In an environment with good channel conditions (clean), an external electronic device (e.g., BIS sink electronic device) selectively receives some of the BIS data transmitted by an electronic device (e.g., BIS source electronic device), thereby redundantly receiving data. can be minimized.

18 and 19A, in the first interval, an external electronic device (e.g., the second electronic device 310, third electronic device 320, fourth electronic device 330, and One of the 5 electronic device 340, the 6th electronic device 350, or the 7th electronic device 360) is the current BIS data “L0, L1” and the BIS data “L4, L5” specified by the PTO. " can be received. In the second interval, the external electronic device may receive the current BIS data “L2, L3” and the BIS data “L6, L7” designated by the PTO. In the third interval, the external electronic device may not receive the current BIS data, but may receive “L8, L9”, which is BIS data designated by the PTO.

Referring to FIGS. 18, 19A, and 19B, the external electronic device can successfully receive all BIS data L0 to L9 in a clean channel condition and store them in the reception buffer. According to one embodiment, “L0, L1, L2, L3” among the BIS data are received as current BIS data in each corresponding interval, and “L4, L5, L6, L7, L8, L9” among the BIS data are received as current BIS data in each corresponding interval. It may be received as BIS data designated by the PTO in each. For example, among the BIS data, “L0, L1, L2, L3” may each be 80 bytes, and among the BIS data, “L4, L5, L6, L7, L8, L9” may each be 120 bytes.

FIG. 20A shows an example in which an electronic device selectively receives BIS data in an environment (busy) with poor channel conditions according to an embodiment, and FIG. 20B shows an example in an environment (busy) with bad channel conditions according to an embodiment. This shows an example of a reception buffer when an electronic device selectively receives BIS data.

In a busy environment with poor channel conditions, an external electronic device (e.g., BIS sink electronic device) may selectively receive some of the BIS data transmitted by an electronic device (e.g., BIS source electronic device). .

Referring to FIGS. 18 and 20A, in the first interval, the external electronic device may receive only the current BIS data “L0, L1” and not receive the BIS data specified by the PTO. In the second interval, the external electronic device may receive only the current BIS data “L2, L3” and not receive the BIS data specified by the PTO. In the third interval, the external electronic device may receive only the current BIS data “L4, L5” and not receive the BIS data specified by the PTO.

Referring to FIGS. 18, 20A, and 20B, the external electronic device can successfully receive BIS data L0 to L5 and store them in the reception buffer. According to one embodiment, among the BIS data, L0 to L5 may be received as current BIS data in each corresponding interval. For example, among BIS data, L0 to L5 may each be 80 bytes.

FIG. 21A shows an example of an electronic device mandatorily receiving BIS data according to an embodiment, and FIG. 21B shows an example of a reception buffer when an electronic device mandatorily receives BIS data according to an embodiment.

An external electronic device (eg, a BIS sink electronic device) may obligately receive all BIS data transmitted by an electronic device (eg, a BIS source electronic device) and store the received data in a reception buffer.

Referring to FIGS. 18 and 21A, in the first interval, the external electronic device can receive the current BIS data “L0, L1, L0, L1” and the BIS data “L4, L5” specified by the PTO. there is. In the second interval, the external electronic device may receive the current BIS data “L2, L3, L2, L3” and the BIS data “L6, L7” designated by the PTO. In the third interval, the external electronic device may receive the current BIS data “L4, L5, L4, L5” and the BIS data “L8, L9” designated by the PTO.

Referring to FIGS. 18, 21A, and 21B, the external electronic device can successfully receive all BIS data L0 to L9 and store them in the reception buffer. According to one embodiment, “L0, L1, L2, L3” among the BIS data are received as current BIS data in each corresponding interval, and “L4, L5, L6, L7, L8, L9” among the BIS data are received as current BIS data in each corresponding interval. It may be received as BIS data designated by the PTO in each. For example, among the BIS data, “L0, L1, L2, L3” may each be 80 bytes, and among the BIS data, “L4, L5, L6, L7, L8, L9” may each be 120 bytes.

Because the BIS source electronic device must simultaneously perform repetitive audio data transmission and periodic advertising, it may be difficult to provide a stable BIS service for a long time in an electronic device with limited RF resources and battery capacity.

For example, if a mobile phone supports the BIS service, some of the RF resources may need to be permanently used to transmit BIS audio data, and additionally, transmission information of the BIS audio data may need to be broadcast. In addition, since mobile phones have no way to respond to changes in the surrounding wireless environment when performing BIS services, it is difficult to operate a variable bit rate and a fixed bit rate must be used, resulting in current consumption, coexistence with WiFi, or sound interruption. Issues like this may occur.

According to one embodiment, an electronic device (e.g., electronic device 101 of FIG. 1; first electronic device 300 of FIG. 3) includes a communication circuit (e.g., communication module 190 of FIG. 1). ) and at least one processor (eg, processor 120 in FIG. 1) connected to the communication circuit. The at least one processor broadcasts an advertising message containing information about a first bitrate and a first transmission power used to transmit broadcast isochronous stream (BIS) data. You can control it to do so. The at least one processor may control transmission of the first BIS data in the first interval based on the second bit rate and the second transmission power. The at least one processor may control transmission of the second BIS data in the first interval based on the third bit rate and third transmission power.

According to one embodiment, the first BIS data may be data related to a current BIS event, and the second BIS data may be data related to a BIS event indicated by a pre-transmission offset (PTO). According to one embodiment, the second bit rate may be set to be greater than the first bit rate, and the second transmission power may be set to be greater than the first transmission power.

According to one embodiment, the advertising message includes the number of BIS, burst number (BN), number of subevents per BIS, number of groups carrying data related to the current BIS event, and pre-transmission (PTO). offset), or a time value between adjacent anchor points.

According to one embodiment, the first BIS data may be audio data related to the current BIS event, and the second BIS data may be control data related to the current BIS event.

According to one embodiment, the at least one processor may set a first group including BIS data to be transmitted in the first interval based on the second bit rate and the second transmission power. According to one embodiment, the at least one processor may set a second group including BIS data to be transmitted in the first interval based on the third bit rate and the third transmission power.

According to one embodiment, the at least one processor may determine the third bit rate and the third transmission power based on the quality of the second BIS data.

According to one embodiment, an electronic device (electronic device 101 in FIG. 1; any one of the second electronic device 310 to the seventh electronic device 360 in FIG. 3) includes a communication circuit (e.g., FIG. 1 It may include a communication module 190) and at least one processor (eg, processor 120 of FIG. 1) connected to the communication circuit. The at least one processor may receive an advertising message containing information about a first bitrate and first transmission power used to transmit broadcast isochronous stream (BIS) data. The at least one processor may receive first BIS data transmitted based on a second bit rate and a second transmission power in a first interval. The at least one processor may receive second BIS data transmitted based on the third bit rate and third transmission power in the first interval.

According to one embodiment, the at least one processor may selectively receive a portion of the first BIS data transmitted based on the second bit rate and the second transmission power in the first interval. According to one embodiment, the at least one processor may selectively receive a portion of the second BIS data transmitted based on the third bit rate and the third transmission power in the first interval. According to one embodiment, the at least one processor may store the successfully received data among the first BIS data and the successfully received data among the second BIS data in a buffer.

Figure 22 shows a method of operating an electronic device according to an embodiment of the present disclosure.

Referring to FIG. 22, in operation 2210, an electronic device (e.g., electronic device 101 in FIG. 1; first electronic device 300 in FIG. 3) is used to transmit broadcast isochronous stream (BIS) data. An advertising message containing information about the first bitrate and first transmission power may be broadcast. In operation 2220, the electronic device may transmit first BIS data in a first interval based on the second bit rate and the second transmission power. In operation 2230, the electronic device may transmit second BIS data in the first interval based on the third bit rate and third transmission power.

According to one embodiment, a storage medium storing at least one computer-readable instruction may be provided. When executed by at least one processor, the at least one instruction may cause the electronic device to perform a plurality of operations. The plurality of operations includes broadcasting an advertising message containing information about the first bitrate and first transmission power used to transmit broadcast isochronous stream (BIS) data. It may include actions such as: The plurality of operations may include transmitting first BIS data in a first interval based on a second bit rate and a second transmission power. The plurality of operations may include transmitting second BIS data in the first interval based on a third bit rate and a third transmission power.

Figure 23 shows an example in which an electronic device controls BIS data in detail, according to an embodiment.

Referring to FIG. 23, the electronic device (or BIS source device) transmits general BIS data K that must be transmitted in the corresponding BIS event a preset number of times (e.g., 3 times) in the first interval (ISO_Interval), and PTO It is designated by and K+4, K+8 of data transmitted in advance can be transmitted. The electronic device may adjust the transmission power and/or bit rate of each general BIS data according to the transmission order and/or set time interval of the general BIS data. According to one embodiment, the electronic device sets the transmission power for the first general BIS data K to “power level 1” and the transmission power for the second general BIS data K to “power level 2” in the first interval. , the transmission power for the third general BIS data K can be set to “power level 3”. According to one embodiment, “power level 1” may be set to be greater than “power level 2” and “power level 2” may be set to be greater than “power level 3”.

The electronic device (or BIS source device) transmits the general BIS data K+1 that must be transmitted in the corresponding BIS event a preset number of times (e.g., 3 times) in the second interval, and transmits the preset number of times specified by the PTO and transmitted in advance. Data K+5, K+9 can be transmitted. The electronic device may adjust the transmission power and/or bit rate of each general BIS data according to the transmission order and/or set time interval of the general BIS data in the second interval. According to one embodiment, the electronic device may adjust the transmission power and/or bit rate of each general BIS data to be transmitted in the corresponding BIS event at every interval (ISO_Interval). According to one embodiment, the electronic device may adjust the transmission power and/or bit rate of each general BIS data to be transmitted in the corresponding BIS event at a preset interval.

Figure 24 shows another example in which an electronic device controls BIS data in detail according to an embodiment.

Referring to FIG. 24, the electronic device (or BIS source device) transmits general BIS data K to be transmitted in the corresponding BIS event a preset number of times (e.g., 3 times) in the first interval (ISO_Interval), and PTO It is designated by and K+4, K+8 of data transmitted in advance can be transmitted. The electronic device may adjust the transmission power and/or bit rate of each data specified by the PTO according to the transmission order and/or set time interval of the data specified by the PTO. According to one embodiment, the electronic device sets the transmission power for the first data K+4 designated by the PTO to “power level 0” in the first interval and transmits the second data K+8 designated by the PTO. The power can be set to “power level 2”.

The electronic device (or BIS source device) transmits the general BIS data K+1 that must be transmitted in the corresponding BIS event a preset number of times (e.g., 3 times) in the second interval, and transmits the preset number of times specified by the PTO and transmitted in advance. Data K+5, K+9 can be transmitted. The electronic device may adjust the transmission power and/or bit rate of each data specified by the PTO according to the transmission order and/or set time interval of the data specified by the PTO in the second interval. According to one embodiment, the electronic device may adjust the transmission power and/or bit rate of each data specified by the PTO at every interval (ISO_Interval). According to one embodiment, the electronic device may adjust the transmission power and/or bit rate of each data specified by the PTO at a preset interval.

Figure 25 shows another example in which an electronic device controls BIS data in detail according to an embodiment.

Referring to FIG. 25, the electronic device (or BIS source device) transmits general BIS data K to be transmitted in the corresponding BIS event a preset number of times (e.g., 3 times) in the first interval (ISO_Interval), and PTO It is designated by and K+4, K+8 of data transmitted in advance can be transmitted. The electronic device may adjust the transmission power and/or bit rate of each of the general BIS data and the data specified by the PTO according to the transmission order and/or set time interval of each of the general BIS data and the data specified by the PTO. . According to one embodiment, the electronic device sets the transmission power for the first general BIS data K to “power level 1” and the transmission power for the second general BIS data K to “power level 2” in the first interval. , the transmission power for the third general BIS data K is set to “power level 3”, the transmission power for the first data K+4 specified by the PTO is set to “power level 0”, and the transmission power for the first data K+4 specified by the PTO is set to “power level 0”. The transmission power for data K+8 can be set to “power level 2”. According to one embodiment, “power level 0” may be set to be greater than “power level 1”, “power level 1” may be set to be greater than “power level 2”, and “power level 2” may be set to be greater than “power level 3”. there is.

The electronic device (or BIS source device) transmits the general BIS data K+1 that must be transmitted in the corresponding BIS event a preset number of times (e.g., 3 times) in the second interval, and transmits the preset number of times specified by the PTO and transmitted in advance. Data K+5, K+9 can be transmitted. According to one embodiment, the electronic device may adjust the transmission power and/or bit rate of each of the general BIS data and data specified by the PTO to be transmitted in the corresponding BIS event at every interval (ISO_Interval). According to one embodiment, the electronic device may adjust the transmission power and/or bit rate of each of the general BIS data and the data specified by the PTO at a preset interval.

FIGS. 26A and 26B are diagrams for explaining the operational effects of an electronic device according to an embodiment.

Referring to Figure 26a, the electronic device (or BIS source device) transmits the general BIS data (or payload) P0 that must be transmitted in the corresponding BIS event in the first interval (ISO_Interval) to the first quality (for example, For example, it can be transmitted a preset number of times (e.g., 2 times) at 64 kbps. The electronic device may transmit data P2, which is designated by the PTO and transmitted in advance, at a second quality (for example, 116 kbps) in the first interval. According to one embodiment, the first quality for generic BIS data may have a lower bitrate (i.e., lower quality) and higher transmission power than the second quality for data specified by the PTO. According to one embodiment, the first quality for general BIS data may be set to low quality and the second quality for data specified by the PTO may be set to high quality.

In the second interval, the electronic device transmits general BIS data (or payload) P1 to be transmitted in the corresponding BIS event in first quality (e.g., 64 kbps) a preset number of times (e.g., twice). ) can be transmitted. The electronic device may transmit data P3, which is designated by the PTO and transmitted in advance, at a second quality (for example, 116 kbps) in the second interval.

Referring to FIGS. 26A and 26B, an electronic device (BIS Source) may transmit high quality data designated by the PTO and transmit low quality general BIS data. According to one embodiment, data designated by a high quality PTO is transmitted based on high bit rate and/or low transmission power, and the coverage at which the BIS receiving device can receive the data may be set to be small. there is. According to one embodiment, low quality general BIS data is transmitted based on low bit rate and/or high transmission power, and the coverage at which the BIS receiving device can receive the data may be set large.

According to one embodiment, an electronic device (BIS Source) may transmit high quality general BIS data and transmit low quality data specified by the PTO. According to one embodiment, high quality general BIS data is transmitted based on high bit rate and/or low transmission power, and the coverage at which the BIS receiving device can receive the data may be set to be small. According to one embodiment, data designated by a low quality PTO is transmitted based on low bit rate and/or high transmission power, and the coverage at which the BIS receiving device can receive the data can be set large. there is.

Claims (20)

In an electronic device (101 in FIG. 1; 300 in FIG. 3),
communication circuit (190 in FIG. 1); and
Comprising at least one processor (120 in FIG. 1) connected to the communication circuit (190 in FIG. 1),
The at least one processor (120 in FIG. 1),
Controls to broadcast an advertising message containing information about the first bitrate and first transmission power used to transmit broadcast isochronous stream (BIS) data,
Controlling to transmit the first BIS data in the first interval based on the second bit rate and the second transmission power,
An electronic device that controls to transmit second BIS data in the first interval based on a third bit rate and third transmission power. According to paragraph 1,
The first BIS data is data related to the current BIS event,
The second BIS data is data related to a BIS event indicated by a pre-transmission offset (PTO). According to any one of claims 1 and 2,
The advertising message includes the number of BIS, burst number (BN), number of subevents per BIS, number of groups carrying data related to the current BIS event, pre-transmission offset (PTO), or adjacent anchor. An electronic device further comprising at least one of the time values between points. The method of any one of claims 1 to 3, wherein the at least one processor (120 in FIG. 1),
Setting a first group including BIS data to be transmitted in the first interval based on the second bit rate and the second transmission power,
An electronic device that sets a second group including BIS data to be transmitted in the first interval based on the third bit rate and the third transmission power. The method of any one of claims 1 to 4, wherein the at least one processor (120 in FIG. 1),
An electronic device configured to determine the third bit rate and the third transmission power based on the quality of the second BIS data. According to any one of claims 1 to 5,
The electronic device wherein each of the second bitrate and the third bitrate is set to be lower than or equal to the first bitrate. According to any one of claims 1 to 6,
The third bit rate is set higher than the second bit rate or set lower than the second bit rate. According to any one of claims 1 to 7,
The first BIS data and the second BIS data each include a plurality of packets. In an electronic device (101 in FIG. 1; any one of 310 to 360 in FIG. 3),
communication circuit (190 in FIG. 1); and
Comprising at least one processor (120 in FIG. 1) connected to the communication circuit (190 in FIG. 1),
The at least one processor (120 in FIG. 1),
Receive an advertising message containing information about a first bitrate and a first transmission power used to transmit broadcast isochronous stream (BIS) data,
Receiving first BIS data transmitted based on a second bit rate and a second transmission power in a first interval,
An electronic device that receives second BIS data transmitted based on a third bit rate and third transmission power in the first interval. According to clause 9,
The first BIS data is data related to the current BIS event,
The second BIS data is data related to a BIS event indicated by a pre-transmission offset (PTO). According to claims 9 to 10,
The advertising message includes the number of BIS, burst number (BN), number of subevents per BIS, number of groups carrying data related to the current BIS event, pre-transmission offset (PTO), or adjacent anchor. An electronic device further comprising at least one of the time values between points. According to any one of claims 9 to 11,
The electronic device wherein each of the second bitrate and the third bitrate is set to be lower than or equal to the first bitrate. The method of any one of claims 9 to 11, wherein the at least one processor (120 in FIG. 1),
An electronic device that selectively receives a portion of the first BIS data transmitted based on the second bit rate and the second transmission power in the first interval. The method of any one of claims 9 to 13, wherein the at least one processor (120 in FIG. 1),
An electronic device that selectively receives a portion of the second BIS data transmitted based on the third bit rate and the third transmission power in the first interval. In a method of operating an electronic device (101 in FIG. 1; 300 in FIG. 3),
Broadcasting an advertising message including information about a first bitrate and a first transmission power used to transmit broadcast isochronous stream (BIS) data;
Transmitting first BIS data in a first interval based on a second bit rate and a second transmission power; and
A method comprising transmitting second BIS data in the first interval based on a third bit rate and a third transmission power. According to clause 15,
The first BIS data is data related to the current BIS event,
The second BIS data is data related to a BIS event indicated by a pre-transmission offset (PTO). According to any one of claims 15 to 16,
The advertising message includes the number of BIS, burst number (BN), number of subevents per BIS, number of groups carrying data related to the current BIS event, pre-transmission offset (PTO), or adjacent anchor. A method further comprising at least one of the time values between points. In a method of operating an electronic device (101 in FIG. 1; 310 and 311 in FIG. 3; 320 and 321 in FIG. 3; 330 and 331 in FIG. 3),
An operation of receiving an advertising message including information about a first bitrate and a first transmission power used to transmit broadcast isochronous stream (BIS) data;
Receiving first BIS data transmitted based on a second bit rate and a second transmission power in a first interval; and
A method comprising receiving second BIS data transmitted based on a third bit rate and a third transmission power in the first interval. According to clause 18,
The first BIS data is data related to the current BIS event,
The second BIS data is data related to a BIS event indicated by a pre-transmission offset (PTO). According to any one of claims 18 to 19,
An operation of selectively receiving a portion of the first BIS data transmitted based on the second bit rate and the second transmission power in the first interval; or
The method further includes selectively receiving a portion of the second BIS data transmitted based on the third bit rate and the third transmission power in the first interval.

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