KR20110026710A - Broadcasting system using a broadcasting macframe in wireless personal area networks and controll method thereof - Google Patents

Abstract

PURPOSE: A broadcasting system using a broadcasting MAC frame in a wireless personal area network and a control method thereof are provided to supply a broadcasting service in a personal area communication network. CONSTITUTION: A broadcasting server(100) stores advertisements and each kind of video file, and provides with a wireless transmission device(200) with various broadcasting contents. A wireless transmission device broadcasts data to a terminal device(300). The terminal device judges whether the received data frame is for local area communication or local area broadcasting. The broadcasting server comprises: a broadcasting application for forming broadcasting contents; a broadcasting-dedicated protocol for setting a transmission path of the contents; an Internet protocol layer for discriminating an Internet protocol of the wireless transmission device; and a physical layer for discriminating an MAC(Media Access Control) address of the wireless transmission device.

Description

Broadcasting system using MAC frame and wireless control method in wireless personal communication network {BROADCASTING SYSTEM USING A BROADCASTING MACFRAME IN WIRELESS PERSONAL AREA NETWORKS AND CONTROLL METHOD THEREOF}

The present invention relates to a frame structure for communicating by broadcasting in a local area using a wireless personal communication network and a terminal device using the same. More particularly, the present invention relates to a frame type part of a frame in addition to the values according to the conventional standards. The present invention relates to a method and apparatus for providing near field broadcasting while adding a setting value for near field broadcasting, and determining a frame in the MAC layer, thereby maintaining compatibility with conventional short range communication.

The IEEE standard 802.15.4 was established to provide the basic lower network layer (PHY, MAC) of wireless personal network (WPAN). In particular, the low cost and low speed ubiquitous communication between devices.

The most distinctive feature is that devices at close distance can communicate at low cost without having almost any infrastructure. In addition, low power consumption was also taken into account.

The basic framework presupposes a transfer rate of approximately 250 kbit / s within 10 meters. Several types of physical layers are defined, not just one type of physical layer. Several physical layers were defined to trade off embedded systems that require less power. The first low-speed spec included a transfer rate of around 20 and 40 kbit / s. In the current version, a specification with a transfer rate of about 100 kbit / s has been added.

Lower transfer rates may also be considered in low power consumption specifications. However, as mentioned earlier, the only feature of 802.15.4 among WPAN standards is that it pursues extremely low manufacturing cost and technical simplicity, but it should be done without compromising technical flexibility and generality. will be.

Key features of IEEE 802.15.4 include the ability to reserve time slots for real-time applications, collision reporting with CSMA / CA, and secure communications support. In addition, manufacturers can include power management features such as link quality and energy detection in their devices.

Each device of the IEEE 802.15.4 protocol conceptually communicates with each other over a simple wireless network. The definition of the network layer is based on the OSI model. Although IEEE 802.15.4 defines only the lower layer in the standard document and defines it with interaction with the upper layer in mind, protocol users choose the IEEE 802.2 logical link control sublayer to access the MAC through the convergence sublayer. Can be used as

As described above, the wireless personal communication network (WPAN) using the IEEE standard 802.15.4 has been utilized in various fields because of its simple infrastructure, low cost, and very low power consumption. There are zigbee and blue roots, and it is mainly used in various fields such as communication of personal terminal, connection of audio and headphone and control of home appliances.

However, the wireless personal communication network has mainly used only unicast, which transmits data packets only to specific receivers, or multicast, which transmits data to multiple specific groups of receivers simultaneously. That is, despite many advantages described above, there has been no conventional method for providing a service in a broadcasting manner using the wireless personal communication network.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a system for performing broadcasting or broadcasting in a wireless personal communication network. In addition, in the broadcasting in the wireless personal communication network as described above, by maintaining the standard of the conventional wireless personal communication network to provide a broadcasting system in a wireless personal communication network that minimizes the loss of compatibility with existing devices.

Broadcasting system in a wireless personal communication network according to the present invention for achieving the above object is a broadcast server for providing broadcast content as a multimedia data; A wireless transmission device for converting broadcast content provided from the broadcast server to broadcast using wireless personal communication (WPAN), and broadcasting or short-range broadcasting of data to one or more terminal devices using a wireless personal communication network; And after receiving data from the outside using wireless personal communication, determine whether the frame of the received data is a frame for conventional short range communication or a frame for short range broadcasting received from the wireless transmitting apparatus. It includes at least one terminal device.

On the other hand, a broadcasting terminal in a wireless personal communication network according to the present invention for achieving the above object is a physical layer (PHY) layer that is directly associated with hardware as the lowest layer of the OSI hierarchical structure, responsible for the input and output of the frame; And a MAC layer for analyzing a frame transmitted from the physical layer, and delivering the MAC layer to any one or more layers of a network layer for processing conventional short range communication or a PAL layer newly defined for short range broadcasting according to an analysis result. .

When the MAC layer is a short-range communication frame as a result of analysis of the frame transmitted from the physical layer, the MAC layer is transmitted to a short-range communication network layer which is a previously defined network layer. It is preferable to deliver the PAL layer, which is a newly defined layer for near field broadcasting, and to simultaneously transmit the same to the near field communication network layer and the PAL layer when the frame is commonly used in near field communication and near field broadcasting.

The frame may further include a MAC header defining a content of a MAC frame including a type value for distinguishing a conventional short range communication frame from a newly defined short range broadcasting frame; It is preferable to include a MAC payload including a MAC payload portion and a CRC carrying valid information data.

The MAC header unit includes a frame control unit of 1 byte according to frame control, and the frame control unit includes a frame type unit of 3 bits, and the frame type unit Type) includes a value for distinguishing the conventional short-range communication frame and the newly defined short-range broadcast frame,

Preferably, the MAC layer determines a layer to which a frame is to be transmitted, according to the value of the frame type part.

The MAC layer is preferably transmitted to the local area network when the first bit of the value of the frame type part starts with 0 and to the PAL layer when the first bit of the value of the frame type part starts with one. Do.

In addition, when the three bits of the value of the frame type part are 000, the MAC layer is preferably simultaneously transmitted to the local area network and the PAL layer.

Meanwhile, the MAC frame format for broadcasting in a wireless personal communication network according to an embodiment of the present invention defines contents of a MAC frame including a type value for distinguishing a conventional short range communication frame from a newly defined short range broadcasting frame. MAC header unit; It includes a MAC payload portion carrying valid information data and a MAC suffixer (Footer) including a CRC.

The MAC header unit includes a frame control unit of 1 byte according to frame control, and the frame control unit includes a frame type unit of 3 bits, and the frame type unit Type) preferably includes a type value for distinguishing the conventional short-range communication frame and the newly defined short-range broadcast frame.

In the case of the near-field broadcasting frame, the frame type unit preferably sets the first bit to one.

On the other hand, the frame processing method for broadcasting in a wireless personal communication network according to an embodiment of the present invention includes a physical layer receiving step for receiving a frame from the outside using the wireless personal communication network; A frame analyzing step of analyzing a frame received from the physical layer receiving step to distinguish the frame from a conventional short range communication frame and a newly defined short range broadcasting frame; According to the analyzing step, the MAC layer processing step of transmitting the frame to any one or more layers of the network layer for processing the conventional short-range communication or the PAL layer which is a layer for processing the newly defined short-range broadcasting frame for the short-range broadcasting; It includes.

The frame may further include a MAC header defining a content of a MAC frame including a type value for distinguishing a conventional short range communication frame from a newly defined short range broadcasting frame; It is preferable to include a MAC payload including a MAC payload portion and a CRC carrying valid information data.

The MAC header unit includes a frame control unit of 1 byte according to frame control, and the frame control unit includes a frame type unit of 3 bits, and the frame type unit Type) includes a value for distinguishing a conventional short range communication frame from a newly defined short range broadcasting frame.

In the frame analysis step, it is preferable to determine a layer to which a frame is to be delivered based on the value of the frame type part.

Further, in the frame analyzing step, when the first bit of the value of the frame type part starts with 0, it is determined as a conventional short-range communication frame, and when the first bit of the value of the frame type part starts with 1, it is determined as a near broadcast frame. It is desirable to.

In the frame analyzing step, when three bits of the value of the frame type part are 000, it is preferable to determine that the frame is used simultaneously for the local area network and the local area broadcasting.

As described in detail above, using the MAC frame format and the short-range broadcasting terminal device using the same according to the present invention, in broadcasting in a wireless personal communication network, it is possible to maintain the standard of the conventional wireless personal communication network and maintain the existing devices. It is possible to provide a broadcasting system in a wireless personal communication network while minimizing the loss of compatibility.

Hereinafter, with reference to the drawings will be described in more detail.

1 is a diagram illustrating a broadcasting system in a wireless personal communication network (WPAN) according to an embodiment of the present invention.

As shown in FIG. 1, the system includes a broadcasting server 100 providing content for broadcasting, a wireless transmitting device as an access point (AP) connected to the broadcasting server 100 through a wired network (for example, the Internet). 200, and at least one user terminal device 300 located in a short range area corresponding to the wireless transmission device 200.

Here, the broadcast server 100 stores a large amount of multimedia video files such as various contents, mainly advertisements, and provides them to the wireless transmission apparatus 200 according to various settings. Alternatively, each radio transmitting apparatus 200 may access the broadcast server 100 to download and transmit contents to be broadcast.

Thereafter, the wireless transmission device 200 broadcasts the content to one or more terminal devices 300 around the content.

In other words, in the case of the store of the brand A, the wireless transmission device 200 is installed in its own store and broadcasts the advertisement image of the brand A as the content. Then, the advertisement image flows out to the mobile terminal of the terminal device 300 in the short range area, that is, the users entering the store. Or each time a customer enters the department store provides the terminal device 300 at the front door. In the department store, the wireless transmission apparatus 200 is installed in each store, and each wireless transmission apparatus 200 broadcasts broadcast content related to the store in which it is installed. Then, the user will be able to see the broadcast content associated with the store as each store passes by.

That is, the present invention relates to a method of utilizing for broadcasting using wireless personal communication (WPAN) such as ZigBee or Wi-Fi. As described above, the wireless personal communication (WPAN) has been used only in unicasting or multicasting because it can only be short-range communication despite the advantages of low cost and low power consumption. . However, low cost and low power wireless personal communication method is suitable for the above broadcasting service. Accordingly, the present invention maintains the IEEE standard 802.15.4, which is the physical (PHY) layer and MAC layer standard of the conventional wireless personal communication network (WPAN). Provides a method for use in broadcasting.

Hereinafter, for convenience of description, the conventional wireless personal communication method such as Zigbee or Wi-Fi will be referred to as short-range communication, and the wireless personal communication method newly defined for broadcasting according to the present invention will be referred to as short-range broadcasting. .

FIG. 2 is a diagram illustrating an example of a communication layer of the system shown in FIG. 1. As shown in Figure 2, the network hierarchy of the system for achieving the present invention is a broadcast server 100, a wireless transmission device 200 connected to the broadcast server 100 and a wired network (for example, the Internet), and the corresponding One or more user terminal devices 300 for receiving near-field content from the wireless transmission device 200 have a structure in which they are interconnected.

Here, the broadcast server 100 may include a broadcasting application layer for forming content for broadcasting, and a broadcast transmission protocol for setting content for transmission through a transmission path on a wired network (for example, the Internet). TCP / UDP) layer, an Internet protocol (IP) layer for determining an Internet protocol address of a wireless transmission apparatus 200 corresponding to a local area for broadcasting content, and a corresponding wireless transmission apparatus 200 based on an Internet protocol address A media access control (MAC) layer for determining a Media Access Control (MAC) address of a MAC and a physical (PHY) layer for transmitting content over a wired network are included.

The wireless transmission device 200 which is an access point (AP) is connected to an internet protocol-based wired network and broadcasts in a short range broadcast in a short range region corresponding to the internet protocol module 210 and content provided for broadcasting. It is divided into a short range broadcasting module 220 for execution.

The internet protocol network module 210 is a MAC layer having a physical (PHY) layer for connecting with a wired network, a media access control address for indicating a destination for receiving content delivered from the wired network, and a media access control address. And an Internet Protocol (IP) layer having an Internet Protocol address assigned thereto.

Accordingly, the internet protocol network module 210 delivers the content to the near field broadcasting module 220 in the form of a broadcast transmission conversion protocol (eg, MPEG2-TS; Moving Pictures Experts Groups 2-Transport Stream).

The short range broadcasting module 220 of the present invention includes both a hierarchical structure for short range broadcasting for the present invention and a hierarchical structure for conventional short range communication. Accordingly, it is possible to maintain compatibility with all methods of the conventional wireless personal communication (WPAN) and newly defined short range broadcasting. First, the short range broadcasting module 220 is a layer that processes a conventional Zigbee signal. )

Similarly, a layer for processing a short range broadcast signal includes an upper layer, a PAL layer, a PAL layer, a sicasting layer, and a ZigBee PHY.

The ZigBee PHY is a lower layer of the OSI hierarchy, which is a physical (PHY) layer that is directly related to hardware and is responsible for input / output of a frame.

Similarly, the Zigbee NWK and the PAL layer (PAL) are layers that each perform a role corresponding to the network layer in the OSI layer structure. The ZigBee APL Layer and the UPLAYER are layers that perform the role of an upper layer of the network layer in an OSI layer structure, respectively. The role of the layers can be easily known to those skilled in the art and a detailed description thereof will be omitted.

The problem is that the casting layer (Sicasting Layer) performs the function of the data link layer, that is, the MAC layer (Media Access Control) in the OSI layer structure, the MAC layer in the present invention (hereinafter referred to as just MAC layer for convenience of description) The frame shall transmit the frame received from the physical layer to the upper layer by distinguishing Zigbee and local area broadcasting, which are general short range communication. For this function, MAC frames are branched according to this value so as to newly define values within the limits of maintaining the conventional IEEE 802.15.4 standard, which will be described in more detail below.

The network hierarchical structure of the terminal device 300 is similar to the hierarchical structure of the short range broadcasting module 220 of the wireless transmission device 200, and thus detailed description thereof will be omitted.

3 is a diagram illustrating a frame control field of a structure of a MAC frame according to the IEEE 802.15.4 standard.

First, a MAC frame according to IEEE 802.15.4 generally includes a MAC header (MAC header, MHR), a MAC payload, and a MAC footer (MFR).

The MAC header (MHR) is composed of a frame control field, a sequence number, an addressing field, and an auxiliary security header.

The MAC payload is a payload portion that performs information transfer function according to a variable length frame type, the MAC suffix (MFR) includes an FCS field, and the FCS field is 2 octets long. It contains a 16-bit CRC.

The frame control field, which is part of the MHR, is configured as shown in FIG. Among these, the present invention adds the value for the short-range broadcasting frame for the present invention to the value of the frame type.

In the existing IEEE 802.15.4 MAC frame (or Zigbee frame), the frame type (Frame type) should be set to one of the values in Table 1 below.

Frame type value (b2b1b0) Explanation 000 Beacon 001 Data 010 Acknowledgment 011 MAC Command 100-111 Reserved

In the case of using the conventional standard as described above, the MAC frame is limited to beacons, data, acknowledgments, and MAC commands. Therefore, in the present invention, in order to use a protocol stack structure for transmitting a new local broadcasting in addition to the existing ZigBee as shown in FIG. 4, a new MAC frame and a frame type need to be defined and operated.

In FIG. 4, new values such as new master beacon, broadcasting data, and broadcasting command are assigned to 100, 101, and 110, respectively.

After the frame type value is newly allocated, a method of transferring the values to the upper layer will be described in detail with reference to FIGS. 5 to 7.

5 shows a case in which the frame type is 000. That is, as a method for branching in ZigBee and MAC (Sicasting) layers following the IEEE 802.15.4 structure, beacons are used identically because they use the same beacons to achieve compatibility with existing Zigbees. It must be delivered to each higher layer. Therefore, when the subfield of the frame type has a bit value of 000, this corresponds to a shared beacon and is transmitted to both the ZigBee NWK and the PAL layer.

6 shows a case where the frame type values are 001,010 and 011. These represent conventional data, acknowledgment, and MAC commands. If the first bit of the frame type has a value of 0, the corresponding frames are transmitted to the ZigBee NWK layer. That is, all existing ZigBee frames are transmitted to the ZigBee NWK layer.

7 shows the case in which the frame type values are 100, 101, and 110. FIG. These represent the newly allocated master beacon, broadcasting data, and broadcasting command for short range broadcasting. When the first bit of the frame type has a value of 1, Corresponding frames are transmitted to the PAL layer.

8 is a flowchart used to explain an operation method according to a newly defined frame type according to an embodiment of the present invention.

First, the terminal device receives a frame using a wireless personal communication network (S410).

The frame type value is extracted from the header of the frame in the MAC layer (S420).

If the frame type value is 000 (S430-Y), this means a beacon, and in the present invention, since the same beacon is used to achieve compatibility with the existing ZigBee, the beacons are used in the same manner, and all of them must be transmitted to each upper layer. do. Therefore, both the ZigBee NWK and the PAL layer are transmitted (S440).

If the first bit of the frame type value is 0 (S450-Y), they represent conventional data (Data), acknowledgment, and MAC command, and are transmitted to the ZigBee NWK layer (S460).

Otherwise, the frame type is values starting with 1, that is, 100, 101 and 110. These represent the newly allocated master beacon, broadcasting data, and broadcasting commands for short range broadcasting, and corresponding frames are transmitted to the PAL layer (S470).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

The present invention relates to a frame structure for broadcasting over a short range area and a control method thereof according to a predetermined wireless personal communication (WPAN) standard, while maintaining compatibility with conventional wireless personal communication such as Zigbee. By providing a method for processing near field broadcasting, which is a broadcasting method, a short distance broadcasting transmitting device or terminal device using the same is not only commercially available or commercially viable, but also practically clearly implemented. It is a possibility invention.

1 illustrates a broadcasting system in a WPAN according to an embodiment of the present invention;

2 is a view showing an example of a communication layer of the system shown in FIG.

3 is a diagram illustrating a frame control field of a structure of a MAC frame according to the IEEE 802.15.4 standard;

4 is a diagram showing an example of a frame type value according to an embodiment of the present invention;

5 to 7 are views used to explain a method of transferring to a higher layer according to a frame type value;

8 is a flowchart used to explain an operation method according to a newly defined frame type value according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: broadcast server 200: wireless transmission device

210: Internet protocol network module 220: short range broadcasting module

300: terminal device

Claims (12)

A broadcast server providing broadcast content as multimedia data; A wireless transmission device for converting broadcast content received from the broadcast server to broadcast using a wireless personal communication network (WPAN), and broadcasting data to at least one terminal device using a wireless personal communication network for short range broadcasting; And After receiving the data using a wireless personal communication network from the outside, and determines whether the frame of the received data is a frame for the conventional short-range communication or a frame for the short-range broadcasting received from the wireless transmitting device to perform the processing Broadcasting system in a wireless personal communication network comprising at least one terminal device. A physical (PHY) layer which is directly related to hardware and is in charge of input / output of a frame as a lower layer of the OSI layer structure; And Analyzing a frame transmitted from the physical layer, and according to the analysis result includes a MAC layer for delivering to any one or more of the network layer for processing the conventional local area network or the PAL layer which is a newly defined layer for local area broadcasting. A broadcasting terminal in a wireless personal communication network. The method of claim 2, The MAC layer is In the case of the short range communication frame as a result of the analysis of the frame transmitted from the physical layer, and delivers to the short range communication network layer which is a network layer previously defined, If the result of the analysis of the frame is a frame for short-range broadcasting, it is delivered to the PAL layer, a newly defined layer for short-range broadcasting, In the case of a frame commonly used in near field communication and near field broadcasting, a broadcasting terminal in a wireless personal communication network, which is simultaneously transmitted to the near field communication network layer and the PAL layer. The method of claim 2, The frame is A MAC header unit defining contents of a MAC frame including a type value for distinguishing a conventional short range communication frame from a newly defined short range broadcasting frame; MAC payload unit carrying valid information data and Broadcasting terminal in a wireless personal communication network comprising a MAC suffix (Footer) comprising a CRC. The method of claim 4, wherein The MAC header part Including a frame control unit (Frame Control) of 1 byte according to the frame control, The frame control unit includes a 3-bit frame type, and includes a value for distinguishing the conventional short range communication frame from a newly defined short range broadcast frame in the frame type. , The MAC layer is And a layer for transmitting a frame according to a value of the frame type unit. The method of claim 5, The MAC layer is When the first bit of the value of the frame type part starts with 0, the value is transmitted to a local area network layer. And transmitting the first bit of the value of the frame type part to the PAL layer. The method of claim 5, The MAC layer is And three bits of the value of the frame type part are simultaneously transmitted to the local area network layer and the PAL layer. A physical layer receiving step of receiving a frame using an external wireless personal communication network; A frame analysis step of analyzing a frame received from the physical layer receiving step, wherein the frame distinguishes a conventional short range communication frame from a newly defined short range broadcasting frame; According to the analyzing step, the MAC layer processing step of transmitting the frame to any one or more layers of the network layer for processing the conventional short-range communication or the PAL layer which is a layer for processing the newly defined short-range broadcasting frame for the short-range broadcasting; Frame processing method for broadcasting in a wireless personal communication network comprising a. The method of claim 8, The frame is A MAC header unit defining contents of a MAC frame including a type value for distinguishing a conventional short range communication frame from a newly defined short range broadcasting frame; And a MAC suffix (Footer) including a MAC payload portion and a CRC carrying valid information data. 10. The method of claim 9, The MAC header part Including a frame control unit (Frame Control) of 1 byte according to the frame control, The frame control unit (Frame Control) includes a frame type of 3 bits (Frame Type), the frame type (Frame Type) includes a value for distinguishing the conventional short-range communication frame and the newly defined short-range broadcast frame; , The frame analysis step And a layer for transmitting the frame according to the value of the frame type unit. The method of claim 10, The frame analysis step If the first bit of the value of the frame type part starts with 0, it is determined as a conventional short-range communication frame. If the first bit of the value of the frame type part starts with 1, the frame processing method for broadcasting in a wireless personal communication network, characterized in that it is determined as a short-range broadcasting frame. The method of claim 10, The frame analysis step And when three bits of the value of the frame type part are 000, the frame processing method for broadcasting in a wireless personal communication network, characterized in that it is determined that the frame is used simultaneously for the local area network and the local area broadcasting.

Images