KR20080008196A - Wireless network system and method for transmitting and receiving data on the wireless network - Google Patents

Abstract

The present invention relates to a wireless network system and a method for transmitting and receiving data on the wireless network, the wireless communication system in the high frequency band that does not receive a beacon frame (Beacon Frame) or damaged beacon frame received A wireless network system that enables a station to obtain schedule information in a super frame and a method of transmitting and receiving data on the network.

The wireless network coordinator according to an embodiment of the present invention is a MAC unit for generating a beacon frame (Beacon Frame) for forming a super frame including at least one channel time block (Channel Time Block), and the channel Transmitting the beacon frame including the information on the setting through a band management unit and a predetermined communication channel for setting a specific channel time block of the time block to the interval in which a packet containing a predetermined control command is transmitted and received And a transmitting unit.

Description

Wireless network system and method for transmitting and receiving data on the wireless network {wireless network system and method for transmitting / receiving data under the wireless network}

1 is a diagram illustrating a half-duplex wireless network using a conventional transmission request and a transmission clear.

2 is a view showing a conventional super frame.

3 is a diagram illustrating a wireless network system according to an embodiment of the present invention.

4 is a diagram illustrating a communication layer according to an embodiment of the present invention.

5 is a diagram illustrating a super frame according to an embodiment of the present invention.

6 is a view showing a control command according to an embodiment of the present invention.

7 is a diagram illustrating schedule information according to an embodiment of the present invention.

8 is a block diagram illustrating a wireless network coordinator according to an embodiment of the present invention.

9 is a block diagram illustrating a station according to an embodiment of the present invention.

10 is a flowchart illustrating the operation of a radio network coordinator according to an embodiment of the present invention.

11 is a flowchart illustrating a process of transmitting and receiving data by a station according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

810: CPU 820: memory

830 bus 840 MAC unit

850: Band management unit 860: PHY unit

870: Antenna

The present invention relates to a wireless network system and a method for transmitting and receiving data on the wireless network, and more particularly, to receive a beacon frame that does not receive a beacon frame or a damaged beacon frame among stations performing wireless communication in a high frequency band. A wireless network system that enables a station to obtain schedule information in a super frame and a method of transmitting and receiving data on the network.

1 is a diagram illustrating a half-duplex wireless network using a conventional transmission request and a transmission clear.

In general, a wireless network uses a half-duplex method that cannot transmit and receive at the same time. A half-duplex method uses a request request (RTS) to prevent a collision with media occupancy when accessing a wireless medium. To Send (111) signal and Clear To Send (CTS) signal 121 are used.

The transmitting station 110 having a frame to transmit first starts a transmission procedure by transmitting a transmission request signal 111, and all stations in the vicinity of receiving it stop the generation of radio waves. When the reception station 120 receives the transmission request signal 111, the reception station 120 responds with the transmission clear signal 121, and the transmission clear signal 121 also stops generation of radio waves of all the stations in the vicinity. The transmitting station 110 that has received the transmission clear signal 121 transmits the frame 112 and receives an acknowledgment signal 122 from the receiving station 120 that has received it.

Carrier Sense Multiple Access with Collision Avoidance (CSMA / CA), a Media Access Control (MAC) algorithm commonly used in wireless LAN environments, is distributed coordination function (DCF). The distributed coordination function, like Ethernet, checks that the radio link is clean before transmitting station 110 transmits frame 112 and ends each frame 112 to avoid collisions with other stations. Use an arbitrary back-off at that point.

Carrier sensing is used to determine if a medium is available and is classified into physical carrier sensing and virtual carrier sensing. Physical carrier detection is provided by the physical layer and depends on the medium and modulation scheme used. The virtual carrier detection is provided by a network allocation vector (NAV), which is a timer indicating time information when a medium is reserved. Here, the network allocation vector is included in the frame header of the transmission request signal 111 and the transmission clear signal 121 and transmitted, and the transmission station 110 and the reception station 120 store the time required for completing the operation in the network allocation vector. To prevent the use of media by other stations.

Meanwhile, timing in a wireless fan environment is based on a super frame.

FIG. 2 is a diagram illustrating a conventional super frame, in which the super frame 200 starts with a beacon period 210, and includes a contention access period 220 and a channel time allocation period 230. It consists of Asynchronous data or a control command is transmitted and received through the contention access section 220. The channel time allocation period 230 is composed of a channel time allocation (CTA) 232 and a management CTA (MCTA) 231, and control commands, isochronous data, or asynchronous data are stored through the CTA 232. It is sent and received.

The length of the contention access section 220 is determined by the access point, and is transmitted to the stations participating in the network through the beacon frame distributed in the beacon section 210.

The contention access section 220 uses the aforementioned CSMA / CA as a medium approach. On the other hand, the channel time allocation interval 230 uses a time division multiple access (TDMA) scheme having a specific time window for each station, and the access point uses a channel time for an apparatus requesting medium access. (Channel Time) is allocated and data is transmitted and received with the corresponding station during the period. Here, the MCTA 231 is allocated to a pair of stations that want to transmit and receive data to each other and used as a shared CTA using TDMA or using a slotted Aloha protocol.

Meanwhile, in the data transmission, a method of transmitting compressed data through a giga band and a method of transmitting uncompressed data through several tens of giga band has been attempted. Since uncompressed data is higher in capacity than compressed data, it can be transmitted only through several tens of gigabytes, and even if a packet loss occurs during transmission, it has less effect than the compressed data in outputting data. Receive.

In such wireless communication, the beacon frame contains schedule information for access to the network medium. That is, the stations on the network know the arrangement status of the contention access section and the channel time allocation section through the beacon frame, and thus can access or withhold the medium.

On the other hand, there may be a station that does not receive a beacon frame or receive a damaged beacon frame due to a problem in the network or the station itself. Since such a station does not receive schedule information of the network, the corresponding super frame is terminated. Access to the medium will be unavailable until a beacon frame is received. Accordingly, the data being transmitted by the corresponding station may be delayed, and the corresponding band of the super frame allocated to the station may be left unused, resulting in waste of media.

Accordingly, there is a need for an appearance of the invention that allows a station that does not receive a beacon frame or receives a damaged beacon frame to receive schedule information of a network.

An object of the present invention is to enable a station that does not receive a beacon frame or receives a damaged beacon frame among stations that perform wireless communication in a high frequency band to obtain schedule information in a super frame.

The objects of the present invention are not limited to the above-mentioned objects, and other objects which are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a wireless network coordinator according to an embodiment of the present invention generates a beacon frame for constructing a super frame including at least one channel time block. The MAC unit, a band management unit for setting a specific channel time block among the channel time blocks to a section in which a packet including a predetermined control command is transmitted and received, and information about the setting through a predetermined communication channel. And a transmitting unit for transmitting the included beacon frame.

The station according to an embodiment of the present invention includes a determination unit for determining whether to receive a beacon frame and a packet including a first command for requesting schedule information of the super frame in which the beacon frame is transmitted according to the determination result. Transmitting a packet including the first command through a specific channel time block among a MAC unit to be generated and at least one channel time block included in the super frame, and notifying the schedule information in response to the transmission; And a sending unit for receiving a packet containing two instructions.

According to an aspect of the present invention, there is provided a method of constructing a network, including: generating a beacon frame for constructing a super frame including at least one channel time block; Setting a specific channel time block among the channel time blocks to a section in which a packet including a predetermined control command is transmitted / received and transmitting the beacon frame including information on the setting through a predetermined communication channel. It includes a step.

According to an embodiment of the present invention, a method for transmitting and receiving data includes determining whether a beacon frame is received and a first command for requesting schedule information of a super frame in which the beacon frame is transmitted according to the determination result. Generating a packet, transmitting a packet including the first command through a specific channel time block among at least one channel time block included in the super frame, and notifying the schedule information in response to the transmission; Receiving a packet containing a second command to:

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a diagram illustrating a wireless network system according to an embodiment of the present invention. The wireless network system includes a wireless network coordinator 310 and a wireless network station 321, 322, 323, 324.

The radio network coordinator 310 serves to adjust the bandwidth allocation of the stations 321, 322, 323, and 324 present on the network by transmitting beacon frames. That is, at least one of the stations 321, 322, 323, and 324 constituting the network waits to receive a band with reference to the received beacon frame, or if the band is allocated to another station through the allocated band It will be able to send the data to send to.

A network according to an embodiment of the present invention is configured according to a super frame including at least one channel time block, wherein the channel time block is a reservation which is a time interval reserved for band allocation to a specific station on the network. It may be classified into an unreserved channel time block, which is a time interval in which a band is allocated to a selected station through competition between a channel time block and a station on a network.

Here, the channel time block refers to a time period in which data is transmitted and received between stations existing on the network, and the reserved channel time block and the unreserved channel time block are respectively a channel time allocation period. ) And a contention access period.

A station having data to transmit may transmit data in competition with another station in an unreserved channel time block or transmit data in a reserved channel time block assigned to it. That is, each station on the network refers to schedule information included in the beacon frame to check band allocation and transmit and receive data.

At least one non-reserved channel time block may be included in one super frame, and a specific non-reserved channel time block is a period in which a packet including a control command (hereinafter referred to as a control command packet) is transmitted and received (hereinafter, controlled). Command interval). In this case, the control command is an information request command and information generated by a station that does not receive a beacon frame or receives a damaged beacon frame among the stations on the network to request schedule information for at least one or more schedule sections included in the super frame. An information response command generated by the wireless network coordinator 310 to include the schedule information as a response to the request command.

Accordingly, a station that does not receive a beacon frame or receives a damaged beacon frame due to a network or its own problem can also obtain schedule information and reserve channel time allocated to itself without violating a reserved channel time block allocated to another station. It is possible to transmit data through a block or to compete with other stations in an unreserved channel time block.

In addition, the control command section may be disposed immediately after the beacon section and its position and size are constant. Accordingly, the station that does not receive the beacon frame or receives the damaged beacon frame may obtain schedule information for the entire super frame.

4 is a diagram illustrating a communication layer according to an embodiment of the present invention.

In general, the communication layer 400 starts with a channel layer 440, which refers to a physical medium of a predetermined frequency band at which radio signals propagate at the lowest level, such as a radio frequency layer 432 and a baseband. A PHY layer 430 including a baseband layer 431, a media access control layer 420, and an upper layer 410 are included. Here, the upper layer 410 may be a layer above the MAC layer 420 and include an LLC layer (Logical Link Control layer), a network layer, a transport layer and an application layer.

However, the wireless channel according to the embodiment of the present invention may include a high frequency band such as 60 GHz as well as a low frequency band such as 2.4 GHz or 5 GHz. Accordingly, the channel layer 440 may perform unidirectional communication as well as directional communication.

5 is a diagram illustrating a super frame according to an embodiment of the present invention. The super frame 500 includes a beacon period, unreserved channel time blocks 521, 522, 523, 524, and 525 and reserved channel time blocks 531, 532, 533, 534, 535, and 536.

During the beacon period, the beacon frame 511 is distributed by the radio network coordinator. Accordingly, the stations receiving the beacon frame 511 know the allocation state of the band on the network using the schedule information included in the beacon frame 511. It becomes possible.

The non-reserved channel time blocks 521, 522, 523, 524, and 525 are sections in which two or more stations to transmit data compete with each other, and only a station selected in a contention may transmit data through an allocated band.

The reserved channel time blocks 531, 532, 533, 534, 535, and 536 are intervals in which a band is allocated to a specific station, and only the specific station to which the band is allocated transmits data that it wants to transmit through the allocated band. can do.

5, at least one unreserved channel time block 521, 522, 523, 524, and 525 and a reserved channel time block 531, 532, 533, and 534 are included in one super frame 500. , 535, and 536 may be included, and the specific unreserved channel time block 521 may be set as a control command interval.

That is, a station that does not receive a beacon frame 511 or a damaged beacon frame among the stations present on the network transmits a packet including an information request command through a control command interval, and the wireless network coordinator who receives the beacon frame 511 receives the beacon frame 511. In response to a packet including an information request command, a packet including an information response command is generated and distributed. Accordingly, the station that does not receive the beacon frame 511 or receives the damaged beacon frame may obtain the schedule information even before the next beacon frame 512 is distributed.

 In this case, since the information response command includes schedule information of the corresponding super frame, a station that does not receive the beacon frame 511 or receives a damaged beacon frame may also receive a super frame using the schedule information obtained through the information response command. It is possible to use the channel time block of.

On the other hand, the control command interval is a non-reserved channel time block, the stations are competing with each other to transmit a packet, where the transmission and reception of the packet is a carrier sense multiple access with collision avoidance scheme or slot aloha (slotted aloha).

In addition, as illustrated in FIG. 5, large data such as multimedia data is transmitted through a high frequency channel, and small data such as a packet including a beacon frame 511 or 512 or a control command may be transmitted to a low frequency channel. It can be transmitted through. Here, the high speed frequency channel may include a 60 GHz band, and the low frequency channel may include a 2.4 GHz or 5 GHz band. The high speed frequency channel may be a unidirectional channel having a directivity, and the low frequency channel may be a bidirectional channel having no directivity. In addition, both the high frequency channel and the low frequency channel may be bidirectional channels. To this end, the wireless network coordinator 310 and the stations 321, 322, 323, and 324 may have two PHY layers each responsible for both channels.

6 is a diagram illustrating a control command according to an embodiment of the present invention, wherein the control command 600 includes an identifier field 610, a size field 620, a spare field 630, and a data field 640. do.

The identifier field 610 includes an identifier indicating whether the command is an information request command or an information response command. The size field 620 may include a value indicating the size of the preliminary field 630, and the preliminary field 630 may include values for various purposes for smooth operation on the network.

Here, the information request command is generated by the station, and the station that does not receive the beacon frame or receives the damaged beacon frame generates a packet including the information request command and transmits it through the control command section. The wireless network coordinator generates an information response command including schedule information in response to the received packet, and transmits a packet corresponding thereto. The data field 640 of the information response command may include schedule information, and the size of the data field 640 may be variable. In addition, when the control command is an information request command, the data field 640 may not be included in the information request command.

7 is a diagram illustrating schedule information according to an embodiment of the present invention. The schedule information 700 may include an index field 710, a size field 720, and at least one schedule block 730.

In the index field 710, a flag or unique identifier indicating that the information is schedule information is specified, and in the size field 720, the total size of the schedule block is specified.

Each schedule block 731, 732, 733 has a static indication field 751, a source field 752, a destination field 753, a stream index field 754, a start time field 755, and a block interval. At least one of the field 756, the schedule period field 757, and the number field 758 of the block is included.

Here, the static indication field 751 specifies an identifier indicating whether the corresponding schedule block is for a static schedule. For example, as a schedule of a channel time block existing in a certain time and a certain period in a super frame, a value of 1 is input when the schedule block is a static schedule and a value of 0 is input when the schedule is a dynamic schedule. Can be.

The source field 752 specifies an identifier that indicates the transmitting station that is allowed to allocate band for one of the channel time blocks on the super frame.

The destination field 753 specifies an identifier indicating a receiving station receiving the data from a transmitting station transmitting data through a channel time block in which band allocation is allowed.

The stream index field 754 specifies an assigned stream index designated by the wireless network coordinator, which means the type of data designated to be transmitted and received in the channel time block. For example, when a station requests the creation of an isochronous stream, an unassigned stream index may be specified, where the stream index may be a value defined by the station. On the other hand, when the station requests to reserve or remove the asynchronous channel time block, the stream index may be set to an asynchronous stream value.

In addition, the stream index may be set to a value for requesting modification or removal of an existing schedule. That is, it may be set to a value for band reservation. If a value for band reservation is specified in the stream index field 754, this may mean that the packet is a band allocation request packet.

The start time field 755 specifies the start time of the schedule section corresponding to the schedule block.

The interval field 756 of the block specifies the interval of the channel time block included in the schedule interval.

The schedule duration field 757 specifies the interval of the start time of two consecutive channel time blocks included in the schedule interval.

The number of blocks field 758 specifies the number of channel time blocks included in the schedule period.

8 is a block diagram illustrating a wireless network coordinator according to an embodiment of the present invention, wherein the wireless network coordinator 800 includes a CPU 810, a memory 820, a MAC unit 840, a band manager 850, and a PHY. Unit 860 is configured.

The CPU 810 controls other components connected to the bus 830 and is responsible for the tasks of the upper layers shown in FIG. Accordingly, the CPU 810 processes the received data (received MSDU; MAC Service Data Unit) provided from the MAC unit 840 or generates and provides the transmitted data (send MSDU) to the MAC unit.

The memory 820 stores data. The memory 820 may include a hard disk, an optical disk, a flash memory, a compact flash card, a secure digital card, a smart media card, a multimedia card, or a memory stick. As a module capable of inputting and outputting such information, the module may be provided inside the wireless network coordinator 800 or may be provided in a separate device.

The MAC unit 840 serves to generate a beacon frame for constructing a super frame including at least one channel time block. Here, the band manager 850 may set a specific channel time block among the channel time blocks as a period during which a packet including a predetermined control command is transmitted and received, that is, a control command interval.

At this time, the band manager 850 may arrange the control command section immediately after the beacon section in which the beacon frame is transmitted.

The PHY unit 860 converts the beacon frame generated by the MAC unit 840 into a radio signal and then transmits the radio signal through a predetermined communication channel. To this end, the PHY unit 860 is configured to include a baseband processor (861) and the RF unit 862, and is connected to the antenna 870. The antenna 870 may transmit and receive a directional radio signal in a high frequency band. Here, the communication channel formed by the RF unit 862 includes a communication channel in the 60 GHz band.

The control command is applied to the information request command and the information request command generated by the station that does not receive the beacon frame or the damaged beacon frame among the stations on the network to request the schedule information for at least one schedule section included in the super frame. An information response command generated to include the schedule information as a response to the information response command, which may be generated by the MAC unit 840.

9 is a block diagram illustrating a station according to an exemplary embodiment of the present invention, wherein the station 900 includes a CPU 910, a memory 920, a MAC unit 940, a determination unit 950, and a PHY unit 960. It is configured to include.

The CPU 910 controls other components connected to the bus 930 and is responsible for the tasks of the upper layers shown in FIG. Accordingly, the CPU 910 processes the received data (received MSDU; MAC Service Data Unit) provided from the MAC unit 940 or generates and provides the transmitted data (send MSDU) to the MAC unit 940.

The memory 920 serves to store data. The memory 920 may be a hard disk, an optical disk, a flash memory, a compact flash card (CF) card, a secure digital card (SD) card, a smart card (SMC), a multimedia card (MMC), or a memory stick (Memory Stick). As a module capable of inputting and outputting such information, the module may be provided inside the station 900 or may be provided in a separate device.

The MAC unit 940 generates a MAC Protocol Data Unit (MPDU) by adding a MAC header to the MSDU provided from the CPU 910, that is, data to be transmitted.

The PHY unit 960 converts the MPDU generated by the MAC unit 940 into a radio signal and then transmits it through a communication channel. To this end, the PHY unit 960 is configured to include a baseband processor (961) and the RF unit 962, and is connected to the antenna 970. The antenna 970 may transmit and receive a directional radio signal in a high frequency band.

The baseband processor 961 receives the MPDU generated by the MAC unit 940 and adds a signal field and a preamble to generate a PPDU. Then, the RF unit 962 converts the generated PPDU into a radio signal and transmits it through the antenna 970.

The station 900 may be allocated a band of the reserved channel time block included in the super frame or may compete with another station in the unreserved channel time block to perform the role of the transmitting station. In this case, the station 900 may transmit data through a reserved channel time block allocated to itself with reference to schedule information of a super frame or transmit data through contention with another station in an unreserved channel time block. In addition, transmission of data can be suspended in a reserved channel time block in which a band is allocated by another station.

Here, the schedule information may be provided through the beacon frame, the determination unit 950 determines whether to receive the beacon frame. In the beacon frame, a start time of a beacon frame transmitted later is specified. The determination unit 950 may determine whether to receive a beacon frame to be currently received with reference to a previously received beacon frame. For this purpose, the previously received beacon frame may be stored in the memory 920.

The determination result is transmitted to the MAC unit 940. Accordingly, the MAC unit 940 includes a packet including an information request command for requesting schedule information of a super frame in which the beacon frame is transmitted (hereinafter, referred to as an information request packet). To create). A detailed description of the information request command will be omitted since it has been described above.

The generated information request packet is delivered to the PHY unit 960, and the PHY unit 960 transmits the received information request packet. That is, the wireless network coordinator 800 receives the information request packet, and for this purpose, an address of the wireless network coordinator 800 is inserted or a broadcast address is inserted into a destination field (not shown) of the information request packet. Can be inserted.

As the information request packet is transmitted, the wireless network coordinator 800 generates and transmits a packet (hereinafter, referred to as an information response packet) for an information response command including schedule information.

And, the PHY unit 960 receives the information response packet, which is transmitted to the MAC unit 940, whereby the MAC unit 940 can use the band in the network with reference to the schedule information included in the information response packet. Will be.

On the other hand, when the broadcast address is inserted in the destination field 753, the information request packet can also receive other stations on the network, so that the PHY unit 960 can receive the information response packet from the other station. It may be.

Here, the information request packet and the information response packet may be transmitted and received through a control command section disposed immediately after the beacon section of the super frame. Since the control command section is a non-reserved channel time block, the PHY unit 960 may communicate with other stations. The contention packet is transmitted in competition.

The MAC unit 940 of the station 900 generates data through the process described above, wherein the communication channel used by the PHY unit 960 includes a communication channel in the 60 GHz band, and the transmitted data is non- It may be compressed data.

Meanwhile, a station including the band manager 850 among stations existing on the network may serve as a wireless network coordinator 800. In other words, the station can provide schedule information to other stations on the network by generating and distributing a beacon frame.

10 is a flowchart illustrating the operation of a radio network coordinator according to an embodiment of the present invention.

The MAC unit 840 of the wireless network coordinator 800 generates a beacon frame for constructing a super frame including at least one channel time block (S1010). Here, the beacon frame includes schedule information which is information on a band allocated to a station on a network.

At this time, the band manager 850 may set a specific channel time block among the channel time blocks of the super frame as a section (control command section) in which a packet including a predetermined control command is transmitted and received (S1020). . Here, the control command may include an information request packet and an information response packet.

In addition, the PHY unit 860 transmits the beacon frame generated through the predetermined communication channel (S1030).

A station that does not receive a beacon frame or a damaged beacon frame among the stations on the network may transmit an information request packet to obtain schedule information included in the beacon frame, and the PHY unit 860 receives it (S1040). ). At this time, the information request packet is transmitted through a non-reserved channel time block (control command interval) of the super frame, which may be disposed immediately after the beacon interval of the super frame.

Upon receiving the information request packet, the MAC unit 840 generates an information response packet in response to the information request packet (S1050). At this time, the schedule information may be included in the information response packet.

The information response packet generated in this way is transmitted in the control command section of the super frame and transmitted to the corresponding stations (S1060). Accordingly, the corresponding station can perform network utilization according to the schedule information.

11 is a flowchart illustrating a process of transmitting and receiving data by a station according to an embodiment of the present invention.

The station 900 wishing to transmit data may transmit data through a reserved channel block through schedule information included in a beacon frame or may transmit data in competition with another station through an unreserved channel block, which is a super frame. It may be performed according to the schedule information for.

Therefore, the station 900 that does not receive the beacon frame or receives the damaged beacon frame should attempt to obtain schedule information. For this purpose, the determination unit 950 of the station 900 first receives the beacon frame or not. Determine (S1110). And, the result is delivered to the MAC unit 940, if the beacon frame is not received, the MAC unit 940 generates an information request packet (S1120).

The PHY unit 960 transmits an information request packet through a control command interval (S1130), and receives an information response packet in response thereto (S1140). Here, since the control command interval is an unreserved channel time block, the PHY unit 960 transmits an information request packet through competition with other stations.

On the other hand, the information response packet is delivered to the MAC unit 940, so that the MAC unit 940 can transmit data according to the schedule information included in the information response packet (S1150).

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to the wireless network system of the present invention and the method for transmitting and receiving data on the wireless network as described above, a station that does not receive a beacon frame or a damaged beacon frame among stations performing wireless communication in a high frequency band is received. By allowing the station to acquire schedule information in the super frame, there is an advantage of preventing delay of data transmission and enhancing utilization efficiency of the super frame.

Claims (58)

A MAC unit for generating a beacon frame for constructing a super frame including at least one channel time block; A band manager configured to set a specific channel time block among the channel time blocks to a section in which a packet including a predetermined control command is transmitted and received by a station on a network; And And a transmitting unit for transmitting the beacon frame containing information on the setting via a predetermined communication channel. The method of claim 1, And the specific channel time block is disposed immediately after a beacon period in which the beacon frame is transmitted on the super frame. The method of claim 2, And the specific channel time block is arranged with a predetermined size at an arbitrary position after the beacon period on the super frame. The method of claim 1, The control command may include an information request command for requesting schedule information on at least one schedule section included in the super frame; And And an information response command generated to include the schedule information as a response to the information request command. The method of claim 4, wherein The information request command may include an identifier field indicating that the control command is the information request command; A size field indicating a size of the information request command; And A wireless network coordinator comprising at least one of the reserved fields allocated space for various operations on the network. The method of claim 4, wherein The information response command comprises: an identifier field indicating that the control command is the information response command; A size field indicating a size of the information response command; A spare field which is space allocated for various operations on the network; And And at least one of the data fields in which the schedule information is specified. The method of claim 4, wherein The schedule information may include an index field indicating that the corresponding information is schedule information; A size field indicating a size of the schedule information; And And at least one schedule block. The method of claim 7, wherein The schedule block may include a static indication field indicating whether the corresponding schedule block is for a static schedule; A source field indicating a transmitting station that is allowed to allocate a band for one of the channel time blocks; A destination field for receiving data from the transmitting station through a channel time block for which the band allocation is allowed; A stream index field indicating a type of the data; A start time field indicating a start time of a specific schedule section corresponding to the schedule block; An interval field of a block indicating an interval of a channel time block included in the specific schedule interval; A schedule period field indicating an interval of a start time of two consecutive channel time blocks included in the specific schedule period; And And a number field of blocks indicating a number of channel time blocks included in the specific schedule period. The method of claim 1, The channel time block is a wireless network coordinator, characterized in that the time period (Time Period) that data is transmitted and received between stations existing on the network. The method of claim 9, And the data comprises uncompressed data. The method of claim 1, The channel time block may include a reserved channel time block, which is a time interval reserved for allocating a band to a specific station on the network; And And an unreserved channel time block, which is a time interval in which a band is allocated to one station selected through competition among the stations on the network. The method of claim 11, And the specific channel time block is the unreserved channel time block. The method of claim 1, The method of transmitting and receiving a packet including the control command includes a carrier sense multiple access / collision avoidance scheme or a slotted aloha scheme. The method of claim 1, And the communication channel comprises a communication channel in the 60 GHz band. Determination unit for determining whether to receive a beacon frame; A MAC unit for generating a packet including a first command for requesting schedule information of a super frame in which the beacon frame is transmitted according to the determination result; And A second command for transmitting a packet including the first command through a specific channel time block among at least one channel time block included in the super frame, and including a second command for notifying the schedule information in response to the transmission; And a transmitting unit for receiving the packet. The method of claim 15, And the specific channel time block is disposed immediately after a beacon period in which the beacon frame is transmitted on the super frame. The method of claim 16, The specific channel time block is a station, characterized in that it is arranged with a predetermined size at any position after the beacon interval. The method of claim 15, The channel time block is a station, characterized in that the time period (Time Period) in which data is transmitted and received between stations existing on the network. The method of claim 15, Wherein the data comprises uncompressed data. The method of claim 15, The channel time block may include a reserved channel time block, which is a time interval reserved for allocating a band to a specific station on the network; And And an unreserved channel time block, which is a time interval in which a band is allocated to one station selected through competition among the stations on the network. The method of claim 20, The specific channel time block is the unreserved channel time block. The method of claim 15, The first command comprises: an identifier field indicating that the command is the first command; A size field indicating a size of the first instruction; And And at least one of the reserved fields, the space allocated for various operations on the network. The method of claim 15, The second command comprises: an identifier field indicating that the command is the second command; A size field indicating a size of the second command; A spare field which is space allocated for various operations on the network; And And the schedule information includes at least one of specified data fields. The method of claim 15, The schedule information may include an index field indicating that the corresponding information is schedule information; A size field indicating a size of the schedule information; And At least one schedule block. The method of claim 24, The schedule block may include a static indication field indicating whether the corresponding schedule block is for a static schedule; A source field indicating a transmitting station that is allowed to allocate a band for one of the channel time blocks; A destination field for receiving data from the transmitting station through a channel time block for which the band allocation is allowed; A stream index field indicating a type of the data; A start time field indicating a start time of a specific schedule section corresponding to the schedule block; An interval field of a block indicating an interval of a channel time block included in the specific schedule interval; A schedule period field indicating an interval of a start time of two consecutive channel time blocks included in the specific schedule period; And And a number field of blocks indicating a number of channel time blocks included in the specific schedule interval. The method of claim 15, The manner in which the packet including the first command and the packet including the second command are transmitted and received includes a carrier sense multiple access / collision avoidance method or a slotted aloha method. , station. The method of claim 15, Wherein the communication channel comprises a communication channel in a 60 GHz band. The method of claim 15, And the transmitting unit receives a packet including the second command from a wireless network coordinator or another station on a network according to a destination address of the packet including the first command. Generating a beacon frame for constructing a super frame including at least one channel time block; Setting a specific channel time block among the channel time blocks to a section in which a packet including a predetermined control command is transmitted and received by a station on a network; And Transmitting the beacon frame containing information about the setting over a predetermined communication channel. The method of claim 29, Wherein the specific channel time block is disposed immediately after a beacon period in which the beacon frame is transmitted on the super frame. The method of claim 30, And wherein the specific channel time block is arranged with a predetermined size at an arbitrary position after the beacon interval on the super frame. The method of claim 29, The control command may include an information request command for requesting schedule information on at least one schedule section included in the super frame; And And an information response command generated to include the schedule information as a response to the information request command. The method of claim 32, The information request command may include an identifier field indicating that the control command is the information request command; A size field indicating a size of the information request command; And And at least one of the reserved fields, the space allocated for various operations on the network. The method of claim 32, The information response command comprises: an identifier field indicating that the control command is the information response command; A size field indicating a size of the information response command; A spare field which is space allocated for various operations on the network; And And the schedule information comprises at least one of specified data fields. The method of claim 32, The schedule information may include an index field indicating that the corresponding information is schedule information; A size field indicating a size of the schedule information; And And at least one schedule block. The method of claim 35, wherein The schedule block may include a static indication field indicating whether the corresponding schedule block is for a static schedule; A source field indicating a transmitting station that is allowed to allocate a band for one of the channel time blocks; A destination field for receiving data from the transmitting station through a channel time block for which the band allocation is allowed; A stream index field indicating a type of the data; A start time field indicating a start time of a specific schedule section corresponding to the schedule block; An interval field of a block indicating an interval of a channel time block included in the specific schedule interval; A schedule period field indicating an interval of a start time of two consecutive channel time blocks included in the specific schedule period; And And a number field of blocks indicating a number of channel time blocks included in the specific schedule interval. The method of claim 29, The channel time block is a method for constructing a network, characterized in that the time period (Time Period) that data is transmitted and received between stations existing on the network. The method of claim 37, wherein Wherein the data comprises uncompressed data. The method of claim 29, The channel time block may include a reserved channel time block, which is a time interval reserved for allocating a band to a specific station on the network; And And an unreserved channel time block, which is a time interval in which a band is allocated to one station selected through competition among the stations on the network. The method of claim 39, And the specific channel time block is the unreserved channel time block. The method of claim 29, The manner in which the packet including the control command is transmitted and received includes a carrier sense multiple access with collision avoidance scheme or a slotted aloha scheme. The method of claim 29, The communication channel comprises a communication channel in a 60 GHz band. Determining whether to receive a beacon frame; Generating a packet including a first command for requesting schedule information of a super frame in which the beacon frame is transmitted according to the determination result; Transmitting a packet including the first command through a specific channel time block among at least one channel time block included in the super frame; And Receiving a packet including a second command to notify the schedule information in response to the transmission. The method of claim 43, And the specific channel time block is disposed immediately after the beacon period in which the beacon frame is transmitted on the super frame. The method of claim 44, And the specific channel time block is arranged with a predetermined size at an arbitrary position after the beacon period on the super frame. The method of claim 43, The channel time block is a time period for transmitting and receiving data between stations existing on the network. The method of claim 46, And the data comprises uncompressed data. The method of claim 43, The channel time block may include a reserved channel time block, which is a time interval reserved for allocating a band to a specific station on the network; And And an unreserved channel time block, which is a time interval in which a band is allocated to one station selected through competition among the stations on the network. The method of claim 48, And the specific channel time block is the unreserved channel time block. The method of claim 43, The first command comprises: an identifier field indicating that the command is the first command; A size field indicating a size of the first instruction; And And at least one of spare fields, which are spaces allocated for various operations on a network. The method of claim 43, The second command comprises: an identifier field indicating that the command is the second command; A size field indicating a size of the second command; A spare field which is space allocated for various operations on the network; And And at least one of a data field in which the schedule information is specified. The method of claim 43, The schedule information may include an index field indicating that the corresponding information is schedule information; A size field indicating a size of the schedule information; And And at least one schedule block. The method of claim 52, wherein The schedule block may include a static indication field indicating whether the corresponding schedule block is for a static schedule; A source field indicating a transmitting station that is allowed to allocate a band for one of the channel time blocks; A destination field for receiving data from the transmitting station through a channel time block for which the band allocation is allowed; A stream index field indicating a type of the data; A start time field indicating a start time of a specific schedule section corresponding to the schedule block; An interval field of a block indicating an interval of a channel time block included in the specific schedule interval; A schedule period field indicating an interval of a start time of two consecutive channel time blocks included in the specific schedule period; And And a number field of blocks indicating a number of channel time blocks included in the specific schedule period. The method of claim 43, The manner in which the packet including the first command and the packet including the second command are transmitted and received includes a carrier sense multiple access / collision avoidance method or a slotted aloha method. , How to send and receive data. The method of claim 43, The communication channel comprises a communication channel in a 60 GHz band. The method of claim 43, Receiving a packet containing the second command comprises receiving a packet containing the second command from a wireless network coordinator or another station on a network in accordance with a destination address of the packet containing the first command. , How to send and receive data. The schedule block in which each schedule for at least one channel time block included in the super frame is specified may include: a static indication field indicating whether the corresponding schedule block is for a static schedule; A source field indicating a transmitting station that is allowed to allocate a band for one of the channel time blocks; A destination field for receiving data from the transmitting station through a channel time block for which the band allocation is allowed; A stream index field indicating a type of the data; A start time field indicating a start time of a specific schedule section corresponding to the schedule block; An interval field of a block indicating an interval of a channel time block included in the specific schedule interval; A schedule period field indicating an interval of a start time of two consecutive channel time blocks included in the specific schedule period; And And a number field of blocks indicating a number of channel time blocks included in the specific schedule interval. The method of claim 57, The static schedule comprises a schedule of channel time blocks present in a certain time and a period in the super frame.

Images