KR20150142587A - Method and apparatus for transmitting/receiving audio data in a bluetooth low energy based communication system - Google Patents

Abstract

The present invention relates to a method for transmitting and receiving audio data in a Bluetooth low energy based communication system and an apparatus therefor. According to an embodiment of the present invention, the method that a master device transmits and receives audio data in an Bluetooth low energy based communication system comprises the processes of: configuring a data packet having identification information indicating whether or not the audio data is included in a payload of the data packet; and transmitting the data packet to at least one slave device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for transmitting / receiving audio data in a wireless communication system based on BLE,

The present invention relates to a method and apparatus for transmitting and receiving data in a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving data in a Bluetooth low energy (BLE) based wireless communication system.

Bluetooth is a technology standard for Personal Area Network (PAN) developed in 1994, which is a wireless implementation of short-range communication between portable terminals, notebooks and various wireless devices. The Bluetooth Special Interest Group (SIG), a standards body that administers Bluetooth technology, has proposed the Bluetooth 4.0 standard, which includes Bluetooth low energy (BLE) as Bluetooth low power technology, and is now compliant with the Bluetooth 4.2 standard. The BLE is a technology for enabling data communication in Bluetooth with low power.

FIG. 1 is a diagram for explaining a protocol stack of a BLE, and a specific content of the protocol of the BLE can refer to the Bluetooth 4.2 standard.

Referring to FIG. 1, the L2CAP layers 109 and 113 in the BLE include a Service Discovery Protocol (SDP) layer 101, a Generic Access Profile (GAP) 103, an RFCOMM layer 105, (I.e., a Bluetooth basic rate (BR)) controller for performing data processing in a link layer, a MAC (Media Access Control) layer and a PHY layer, EDR (Enhanced Data Rate) controller, LE (Low Energy) controller). When the L2CAP layer 111 receives data from the upper layer protocol, the L2CAP layer 111 arbitrates the transferred data and sets and manages the respective data for each logical channel and delivers the data to the controllers (i.e., the BR / EDR controller and the LE controller). The logical channel refers to a channel set for data transmitted from an upper layer protocol or application of the L2CAP layer (109, 113).

In FIG. 1, the L2CAP layers 109 and 113 must have a simple and low overhead so that they can be ported to a resource-restricted host such as various portable terminals. The main role of the L2CAP layers 109 and 113 is protocol multiplexing and segmentation and reassembly of data transmitted between the upper layer protocol and the lower layer protocol is also performed by the L2CAP layers 109 and 113, Lt; / RTI > The L2CAP layers 109 and 113 also perform work related to Quality of Service (QoS) and grouping in the piconet configuration. The SDP layer 101 is a protocol for exchanging information on a service of a Bluetooth device connected to the SDP layer 101 and a feature of the service. The GAP 103 is a protocol for providing Bluetooth devices with services such as device discovery, connection models, security, authentication, association models, and service discovery. The RFCOMM layer 105 emulates a serial port.

1, the Asynchronous Connection-Oriented Link (ACL) layer 115 and 119 provide an asynchronous data communication path, and a synchronous connection-oriented (SCO) layer 117 is connected to the voice layer 111, Lt; / RTI >

1, the BR / EDR controller includes a link manager 121 and a link controller 125, and the LE controller also includes a link manager 123 and a link controller 127. The link managers 121 and 123 are responsible for creating, modifying, and releasing logical links and updating parameters associated with physical links between Bluetooth devices. The link controller 125, 127 is responsible for encoding and decoding Bluetooth packets from the data payload and encoding and decoding parameters related to the physical channel, the logical transmission, and the logical link. The link controller 125, 127 also performs link control protocol signaling.

However, the new Bluetooth standard (for example, Bluetooth SIG Core Specification version 4.2, Vol.6, Bluetooth Low Energy) supporting the above-described BLE (for example, LE (Low Energy)) does not support transmission of audio data. Therefore, the BLE also requires a packet structure for supporting transmission of audio data.

The present invention provides a method and apparatus for efficiently transmitting and receiving audio data in a BLE-based wireless communication system.

The present invention also provides a method and apparatus for reducing the overhead of a packet for transmitting audio data in a BLE-based wireless communication system.

A method of transmitting audio data by a master device in a BLE-based wireless communication system according to an embodiment of the present invention includes a step of configuring a data packet including identification information indicating whether the audio data is included in a payload And transmitting the data packet to at least one slave device.

Further, in the BLE-based wireless communication system according to the embodiment of the present invention, the master device includes a communication interface for communication with the at least one slave device based on the BLE, an identification indicating whether the audio data is included in the payload And a control unit configured to configure a data packet including information and transmit the data packet to the at least one slave device.

According to another aspect of the present invention, there is provided a method of receiving audio data from a slave device in a BLE-based wireless communication system, the method comprising: receiving the BLE-based data packet from a master device; And determining whether the data included in the payload of the data packet is the audio data based on the information.

In accordance with an embodiment of the present invention, a slave device in a BLE-based wireless communication system includes a communication interface for communication with the master device based on the BLE, a data packet based on the BLE from the master device, And a controller for determining whether the data included in the payload of the data packet is the audio data based on the identification information included in the data packet.

1 is a diagram for explaining a protocol stack of a BLE,
FIG. 2 is a block diagram illustrating a device for transmitting and receiving data packets in a master-slave manner in a BLE-based wireless communication system according to an embodiment of the present invention;
3 shows a structure of a BLE data packet defined in the Bluetooth SIG core specification,
4 is a diagram illustrating an identifier structure including identification information indicating whether or not audio data is included in a payload in a BLE-based wireless communication system according to an embodiment of the present invention;
5 illustrates an operation of an L2CAP layer using an L2CAP header compressed using an identifier including identification information indicating whether audio data is included in a payload in a BLE-based wireless communication system according to an exemplary embodiment of the present invention Drawings for illustration,
6 is a diagram illustrating a structure of a BLE data packet in a BLE-based wireless communication system according to an embodiment of the present invention;
FIG. 7 illustrates another structure of an L2CAP header compressed using an identifier including identification information indicating whether audio data is included in a payload in a BLE-based wireless communication system according to an embodiment of the present invention;
8 is a diagram illustrating another structure of a BLE data packet in a BLE-based wireless communication system according to an embodiment of the present invention;
9 is a flowchart showing a method of transmitting audio data by a master device in a BLE-based wireless communication system according to an embodiment of the present invention;
10 is a flowchart showing a method of receiving audio data by a slave device in a BLE-based wireless communication system according to an embodiment of the present invention.
11 is a block diagram showing the configuration of a device in a BLE-based wireless communication system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

An embodiment of the present invention proposes a method for transmitting and receiving audio data in a BLE-based wireless communication system.

In an embodiment of the present invention, an L2CAP header of a BLE data packet defined in the BLE standard is divided into audio data (audio data) and audio data (audio data) in order to distinguish a data PDU of a data channel including audio data from a data PDU of another channel, The present invention proposes a structure of a new BLE data packet for transmitting audio data by compressing using an identifier including identification information indicating whether the payload is included in a payload. The BLE data packet for audio data transmission proposed in the embodiment of the present invention uses an L2CAP header compressed using an identifier including identification information indicating whether audio data is included in a payload, As a result, the air packet size of the actually transmitted BLE data packet can be reduced, thereby reducing power consumption.

FIG. 2 is a diagram illustrating devices that transmit and receive BLE data packets in a master-slave manner in a BLE-based wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, the master device 210 may generate a BLE data packet having the compressed L2CAP header structure for transmission of audio data, and may transmit the BLE data packet to one or a plurality of slave devices 230. In the BLE technology, devices can communicate by establishing a link in a master-slave manner using a piconet method. In the piconet scheme, one master device can configure a wireless network with a plurality of slave devices to transmit and receive data packets. For example, in a technology field in which low power consumption is required such as a hearing aid (HA), using the BLE data packet according to the embodiment of the present invention having the compressed L2CAP header structure, power consumption of the slave device is reduced As a matter of course, the use time can be greatly increased. In BLE technology, a device can also be referred to as a LE (Low Energy) device.

To facilitate understanding of the present invention, the structure of existing BLE data packets in BLE technology will be described first.

FIG. 3 is a diagram showing the structure of a BLE data packet defined in the Bluetooth SIG Core Specification, for example, the structure of a BLE data packet defined in Vol. 6, Part B, Section 2.1 of Bluetooth SIG Core Specification version 4.2.

3 is a link layer packet format. The BLE data packet 300 includes a preamble 311, an access address 313, A PDU 315, and a cyclic redundancy check (CRC) 317. The preamble 311 is used in a receiver (i.e., a slave device) to perform frequency synchronization, symbol timing estimation, auto gain control (AGC) training, etc., and has a length of one octet. The access address 313 is an address for distinguishing each link and synchronization for a physical connection, and has a length of 4 octets. When the packet 300 is transmitted on the data physical channel, the PDU 315 is a PDU of the data channel and has a length of 2 to 257 octets. The CRC 317 is for error correction and has a length of 3 octets.

3, the PDU 315 includes a PDU header 319, a PDU payload 321, and a Message Integrity Check (MIC) 323. The PDU of the data channel includes a 16-bit header, and the PDU header 319 is the 16-bit (i.e., 2-octet) header. The PDU payload 321 is a variable-length data payload. The MIC 323 is included in the PDU 315 in the case of an encrypted link layer connection, is for integrity checking, and has a length of 4 octets. In FIG. 3, the PDU payload 321 includes an L2CAP header 325 and a payload 327. The L2CAP header 325 has a total length of 4 octets including a 2-octet length field 325a and a 2-octet channel identifier (CID) field 325b. And the payload 327 includes data received from or transmitted to an upper layer protocol.

The overhead required in an existing structure for transmitting a (encrypted) data packet, such as the structure of the BLE data packet 300 of FIG. 3, is a preamble 311 (1 octet) + an access address 313 (4 octets) + The PDU header 319 (2 octets) + L2CAP header 325 (4 octets) + MIC 323 (4 octets) + CRC 317 (3 octets) = 18 octets (144 bits) Is considerably large. Even if the MIC 323 (4 octets) is not transmitted, the total overhead is 14 octets (112 bits). Assuming that the audio frame duration of this BLE data packet structure is 10 ms and supports sound quality of 32 kbps, since the payload per packet of the required audio stream is 320 bits, the (encrypted) per BLE data packet 31% of the air packet size (25.9% when the MIC (323) is not transmitted) is equivalent to the conventional BLE data packet structure of FIG. 3, which consumes power by overhead. Therefore, when BLE is used in a device such as a hearing aid (HA) in which low power consumption is an important requirement, it is important to reduce the above-mentioned overhead of BLE data packets transmitted and received by the device.

4 is a diagram illustrating an identifier structure including identification information indicating whether or not audio data is included in a payload in a BLE-based wireless communication system according to an embodiment of the present invention. Referring to FIG. 4, The L2CAP header of the new structure can be created in which the overhead is reduced at step 325.

Referring to FIG. 4, the compressed L2CAP header according to the embodiment of the present invention includes a 1-bit identifier field 401 and a 7-bit length field 403. The L2CAP header of FIG. 4 includes an L2CAP header 325a having a 2-octet length field 325a and a 2-octet channel identifier (CID) field 325b, Compressed. When the BLE data packet is transmitted using the compressed L2CAP header having the structure of FIG. 4, the overhead is reduced from the existing 144 bits to 120 bits, and the overhead occupancy in the air packet size is reduced from 31% to 27.3% (From 25.9% to 21.6% in the case where the mobile station 323 is not transmitted).

The length field 325a of the 2 octets in the existing L2CAP header 325 indicates the length (size) of the payload 327 excluding the length of the L2CAP header 325, and the 2-octet CID field 325b indicates Is used to identify the destination channel endpoint of the packet. However, in the BLE standard supporting BLE and HA, only the payload of the data packet in the L2CAP layer of the protocol stack needs to be determined whether it is the payload of the data PDU including the audio data for the HA. Therefore, in the embodiment of the present invention, Bit identifier field 401 for determining whether the data included in the payload is audio data instead of the CID field 325b used in the L2CAP header 325b.

When the slave device 230 of FIG. 2 is HA, the maximum quality used to support the HA is 64 kbps, and the maximum audio data transmitted per packet is 640 bits. Therefore, the length field 403 of FIG. Seven bits are sufficient. Therefore, assuming a BLE data packet for transmitting audio data, the L2CAP header 325 of the existing four octets can be compressed into an L2CAP header of one octet as in the embodiment of FIG.

The 1-bit identifier field 401 indicates / determines whether data included in the payload is audio data in the L2CAP layers 109 and 113 performing multiplexing in the Bluetooth protocol stack of FIG. 1 Can be used. In another embodiment, it is also possible to configure a BLE data packet such that the identification information corresponding to the 1-bit identifier field 401 is independently included regardless of whether the L2CAP header is compressed. At this time, the identification information may be included in the existing L2CAP header or included in another predetermined position of the BLE data packet.

5 illustrates an operation of an L2CAP layer using an L2CAP header compressed using an identifier including identification information indicating whether audio data is included in a payload in a BLE-based wireless communication system according to an exemplary embodiment of the present invention Fig.

FIG. 5A shows an L2CAP header compressed using an identifier including identification information indicating whether or not audio data having a length of one octet proposed in the embodiment of FIG. 4 is included in a payload.

Upon reception of the BLE data packet, the slave device supporting the HA determines whether the data included in the payload is audio data or a data of another channel based on the MSB (Most Significant Bit) 1 bit of the L2CAP header immediately following the PDU header . For example, if the 1-bit identifier field 401 (i.e., MSB) is set to "1 " as shown in FIG. 5A, the data included in the payload of the BLE data packet is determined as audio data, The size of the audio data is checked through the length field 403 following the 1-bit identifier field 401, and the confirmed audio data is transferred from the protocol stack of FIG. 1 to the audio layer 107. If the identifier field 501 (i.e., MSB) is set to "0 " as shown in FIG. 5B, the slave device determines data included in the payload of the BLE data packet as data of another channel, And performs operations of the L2CAP layer. 5B, since the data included in the payload of the BLE data packet is not audio data, the L2CAP header includes a 1-bit identifier field 501, a 15-bit length indicating the length of data to be loaded in the payload, A field 503, and a CID field 505 as usual. If the data included in the payload of the BLE data packet is not audio data, it is also possible to use the existing L2CAP header 325 as it is.

For operation of the above-described slave device, the master device supporting the HA determines whether the data to be transmitted is audio data or not, for example, as shown in FIG. 5 (a) A BLE data packet including a compressed L2CAP header including a length field 403 of 7 bits indicating the length of audio data held in the payload, and transmits the BLE data packet, The L2CAP header may be constructed and transmitted or the existing L2CAP header 325 may be transmitted as shown in FIG. 5 (b).

6 is a diagram illustrating a structure of a BLE data packet in a BLE-based wireless communication system according to an embodiment of the present invention.

The BLE data packet 600 of Figure 6 includes a preamble 611, an access address 613, a PDU 615, and a CRC 617, as in the BLE data packet 300 of Figure 3, and the L2CAP header 625 Are the same as those of the data packet 300 shown in FIG. 3, so that a detailed description thereof will be omitted. As described in the embodiment of FIGS. 4 and 5, the L2CAP header 625 includes a 1-bit identifier field 401 set to "1", for example, when the data included in the payload is audio data, And a 7-bit length field 403 indicating the length. When the data included in the payload is data of another channel, for example, a 1-bit identifier field 501 set to "0", a 15-bit length field 503, and a CID field 505, A header may be constructed or an existing L2CAP header 325 may be used.

On the other hand, when the compressed L2CAP header is configured as in the embodiment of FIGS. 4 and 5, if the size of a data PDU of a channel other than the audio data for the HA exceeds, for example, 128 bytes, an identifier field 401, and 501) and the data of the other channel, so that the audio data can not be distinguished from the data of the other channel. In another embodiment of the present invention, another structure of the compressed L2CAP header is proposed using an identifier including identification information indicating whether audio data capable of preventing the collision is included in the payload.

7 is a diagram illustrating another structure of an L2CAP header compressed using an identifier including identification information indicating whether audio data is included in a payload in a BLE-based wireless communication system according to an embodiment of the present invention .

7A shows an L2CAP header including a 2-octet PDU header 701, a 2-octet length 703 and a 2-octet CID 705, a payload 707, and a CRC 709 field The description of each field is the same as the corresponding fields in FIG. 3, and thus a detailed description thereof will be omitted. 7B shows an identifier including identification information indicating whether audio data including a PDU header 711, a 1-bit identifier 715a and a 7-bit length 715b are included in the payload A packet structure including a compressed L2CAP header of another structure according to an embodiment of the present invention including compressed L2CAP header 715, first payload 713, and second payload 717 fields . The compressed L2CAP header 715 including the 1-bit identifier 715a and the 7-bit length 715b includes an identifier including identification information indicating whether the audio data of FIG. 4 is included in the payload This is the same as the example used.

Referring to the Bluetooth SIG Core Specification version 4.2 Vol 3. Part A, section 2.2, table 2.2, with respect to the first payload 713 and the second payload 717 fields, In the CID, for example, 0x0080 to 0xFFFF are not used. Accordingly, when the compressed L2CAP header 715 is located in the first octet of the CID field 705 of the existing L2CAP header using an identifier including identification information indicating whether the audio data is included in the payload As shown in FIG. 7B, the first payload 713 and the second payload 717 fields including audio data may include identification information indicating whether the audio data is included in the payload By placing the compressed data on both sides of the compressed L2CAP header 715 using the identifier, a collision between the data of the other channels as described above can prevent the problem that the audio data can not be distinguished from the data of another channel.

FIG. 8 is a diagram illustrating another structure of a BLE data packet in a BLE-based wireless communication system according to an embodiment of the present invention. As shown in FIG. 7B, it indicates whether the audio data is included in a payload And a compressed L2CAP header 715 is located using an identifier including identification information.

The BLE data packet 800 of Figure 8 includes a preamble 811, an access address 813, a PDU 815 and a CRC 817, as in the BLE data packet 300 of Figure 3, and the L2CAP header 827 And the first and second payloads 825 and 829 are the same as those of the data packet 300 of FIG. 3, detailed description thereof will be omitted. In the configuration in which the first and second payloads 825 and 829 are separated, the first payload 825 has a length of, for example, 2 octets. The L2CAP header 827 includes a 1-bit identifier field 401 set to "1" in the case where the data included in the payload is audio data as described in the embodiment of FIGS. 4 and 5, And a 7-bit length field 403 indicating the length. If the data included in the payload is data of another channel, an L2CAP header or an existing L2CAP header 325 may be used as shown in FIG. 5 (b).

9 is a flowchart illustrating a method of transmitting audio data by a master device in a BLE-based wireless communication system according to an embodiment of the present invention.

Referring to FIG. 9, in step 901, the master device includes identification information for indicating whether the audio data is included in the payload of the BLE-based data packet proposed in the above embodiments of the present invention, In step 903, the data packet is transmitted to at least one slave device.

10 is a flowchart illustrating a method of receiving audio data by a slave device in a BLE-based wireless communication system according to an embodiment of the present invention.

10, in step 1001, the slave device receives the BLE-based data packet proposed in the embodiments of the present invention from the master device, and in step 1003, the slave device transmits the identification Determines whether the data included in the payload is the audio data, and receives the audio data.

FIG. 11 is a block diagram illustrating a configuration of a device in a BLE-based wireless communication system according to an embodiment of the present invention, wherein the device configuration of FIG. 11 can be applied to the master device and the slave device, respectively.

11, the control unit 1110 transmits a BLE data packet including audio data according to the BLE data packet structure and the data transmission / reception method according to the embodiment of the present invention shown in FIGS. Or receiving operation. The communication interface 1130 includes a communication module for transmitting and receiving data based on BLE with a partner device (master device or slave device).

In the above-described embodiment of the present invention, the master device includes at least one slave device and a communication interface for the BLE-based communication, and indicates whether the audio data is included in the payload of the BLE-based data packet And a controller for controlling the operation of configuring the data packet including the identification information and transmitting the configured data packet to at least one slave device. In addition, in the above-described embodiment of the present invention, the slave device operating as the HA includes a communication interface for communication with the master device based on the BLE, a data packet based on the BLE from the master device, And a controller for determining whether the data included in the payload is the audio data based on the identification information included in the packet.

Claims (40)

A method for transmitting audio data by a master device in a Bluetooth low energy (BLE) based wireless communication system,
Configuring a data packet including identification information indicating whether the audio data is included in a payload; And
And transmitting the data packet to at least one slave device.
The method according to claim 1,
Wherein the identification information is one-bit information.
The method according to claim 1,
Wherein the identification information is included in payload header information of a payload of the data packet,
Wherein the payload header information is compressed header information of an L2CAP layer.
The method according to claim 1,
If the data packet includes the audio data,
Wherein the identification information is included in compressed L2CAP header information of the payload of the data packet, the compressed L2CAP header information has a length of one octet, and further includes 7-bit length information indicating the length of the audio data Transmission method.
The method according to claim 1,
If the data packet does not contain the audio data,
Wherein the header information of the data packet is an L2CAP header including a 2-octet length field and a 2-octet channel identifier (CID) field.
The method according to claim 1,
Wherein the identification information is independently included in the data packet,
Wherein the identification information is used in a multiplexing layer to indicate whether the audio data is included in a payload.
The method according to claim 6,
Wherein the identification information is independently located at the beginning or at the back of the payload of the data packet, or between the payloads separated from each other.
The method according to claim 1,
If the data packet includes the audio data,
Wherein the payload of the data packet includes a first payload and a second payload that are separated from each other and the identification information is included in the compressed L2CAP header information of the data packet, And the second payload.
9. The method of claim 8,
Wherein the header information is located in a first octet of a field in which CID information is located in an existing header structure of an L2CAP layer.
The method according to claim 1,
And the master device supports HA (Hearing Aid).
In a master device in a Bluetooth low energy (BLE) based wireless communication system,
A communication interface for the BLE-based communication with at least one slave device; And
And a control unit configured to configure a data packet including identification information indicating whether or not audio data is included in the payload, and to transmit the data packet to the at least one slave device.
12. The method of claim 11,
Wherein the identification information is one bit of information.
12. The method of claim 11,
Wherein the controller configures the data packet so that the identification information is included in the payload information,
Wherein the header information is compressed header information of an L2CAP layer.
12. The method of claim 11,
If the data packet includes the audio data,
Wherein the controller is further configured to transmit the L2CAP header information including the header information, the header information, and the header information, the header information having a length of one octet, the length information including 7 bits indicating the length of the audio data, device.
12. The method of claim 11,
If the data packet does not contain the audio data,
Wherein the controller configures the data packet to include an L2CAP header including a 2-octet length field and a 2-octet channel identifier (CID) field.
12. The method of claim 11,
Wherein the identification information is independently included in the data packet,
Wherein the control unit indicates in the multiplexing layer whether the audio data is included in the payload of the data packet using the identification information.
17. The method of claim 16,
Wherein the identification information is located independently of the beginning or the end of the payload of the data packet, or between the payloads separated from each other.
12. The method of claim 11,
If the data packet includes the audio data,
Wherein the control unit includes a first payload and a second payload in which payloads of the data packets are separated from each other, the identification information is included in compressed L2CAP header information of the data packet, The master device configuring the data packet to be located between the payload and the second payload.
19. The method of claim 18,
Wherein the header information is located in the first octet of the field in which the CID information is located in the existing header structure of the L2CAP layer.
12. The method of claim 11,
The master device supports HA (Hearing Aid).
A method for receiving audio data from a slave device in a Bluetooth low energy (BLE) based wireless communication system,
Receiving the BLE-based data packet from the master device; And
And determining whether the data included in the payload of the data packet is the audio data based on the identification information included in the received data packet.
22. The method of claim 21,
Wherein the identification information is one-bit information.
22. The method of claim 21,
Wherein the identification information is included in payload information of the data packet,
Wherein the header information is compressed header information of a L2CAP layer.
22. The method of claim 21,
If the data packet includes the audio data,
Wherein the identification information is included in compressed L2CAP header information of the data packet, the header information has a length of one octet, and further includes 7-bit length information indicating a length of the audio data.
22. The method of claim 21,
If the data packet does not contain the audio data,
Wherein the header information of the data packet is an L2CAP header including a 2-octet length field and a 2-octet channel identifier (CID) field.
22. The method of claim 21,
Wherein the identification information is independently included in the data packet,
And determining whether the audio data is included in the payload based on the identification information in the L2CAP layer.
27. The method of claim 26,
Wherein the identification information is located independently of the beginning or the end of the payload of the data packet, or between the payloads separated from each other.
22. The method of claim 21,
If the data packet includes the audio data,
Wherein the payload of the data packet includes a first payload and a second payload that are separated from each other and the identification information is included in the compressed L2CAP header information of the data packet, And wherein the second payload is positioned between the first payload and the second payload.
29. The method of claim 28,
Wherein the header information is located in a first octet of a field in which CID information is located in an existing header structure of a L2CAP layer.
22. The method of claim 21,
Wherein the slave device supports HA (Hearing Aid).
In a slave device in a Bluetooth low energy (BLE) based wireless communication system,
A communication interface for the BLE-based communication with the master device; And
And a controller for receiving the BLE-based data packet from the master device and determining whether the data included in the payload of the data packet is the audio data based on the identification information included in the received data packet Slave device.
32. The method of claim 31,
Wherein the identification information is one-bit information.
32. The method of claim 31,
Wherein the identification information is included in payload information of the data packet,
Wherein the header information is compressed header information of an L2CAP layer.
32. The method of claim 31,
If the data packet includes the audio data,
The identification information is included in the compressed L2CAP header information of the data packet, the header information has a length of one octet, the identification information has a length of 1 bit, and the header information includes 7 Wherein the slave device further comprises length information of the bit.
32. The method of claim 31,
If the data packet does not contain the audio data,
Wherein the header information of the data packet is an L2CAP header including a 2-octet length field and a 2-octet channel identifier (CID) field.
32. The method of claim 31,
Wherein the identification information is independently included in the data packet,
Wherein the control unit further controls the L2CAP layer to determine whether the audio data is included in the payload based on the identification information.
37. The method of claim 36,
Wherein the identification information is independently located at the beginning or at the rear of the payload of the data packet or between the payloads separated from each other.
32. The method of claim 31,
If the data packet includes the audio data,
Wherein the payload of the data packet includes a first payload and a second payload that are separated from each other and the identification information is included in the compressed L2CAP header information of the data packet, And wherein the slave device is located between the first payload and the second payload.
39. The method of claim 38,
Wherein the header information is located in a first octet of a field in which CID information is located in an existing header structure of a L2CAP layer and the first payload has a length of 2 octets.
32. The method of claim 31,
Wherein the slave device supports HA (Hearing Aid).

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