KR100706990B1 - System for MAC Protocol Structure between Fixed Wireless Backhaul Systems and Fixed Wireless Backhaul Therefor - Google Patents

Abstract

The present invention relates to a wireless communication system supporting the MAC protocol between fixed wireless access equipment and a fixed wireless access equipment therefor.

The present invention is based on a WLAN MAC (Media Access Control) standard of Time Division Multiple Access (TDMA) scheme for efficient data transmission in a wireless LAN system, and a Polling Request scheme. A MAC protocol structure between fixed wireless access devices that improves data transmission efficiency between fixed wireless access devices by applying a piggyback request method and a piggyback acknowledgment. A map field for storing configuration information; A downlink field including one or more first subframes each of which download data DATA transmitted from a transmitting wireless base station to a receiving wireless base station is stored; A poll request field for requesting subframe allocation of information on a bandwidth or a rate size required for radio transmission equipment of a transmitting radio base station and a receiving radio base station; And an uplink field including one or more second subframes storing upload data DATA transmitted from a receiving wireless base station to a transmitting wireless base station.

According to the present invention, in order to efficiently transmit data in a wireless LAN system, the data transmission efficiency between fixed wireless access equipments is increased by applying a polling request method, a piggyback request method, and a piggyback solution based on a TDMA type WLAN MAC protocol. Giving effect.

MAC protocol, radio access equipment, radio base station, polling request, piggyback request, piggyback amount

Description

System for MAC Protocol Structure between Fixed Wireless Backhaul Systems and Fixed Wireless Backhaul Therefor}

1 is a diagram illustrating a frame structure of a general MAC protocol;

2 is a diagram illustrating a value of an address field according to a MAC protocol;

3 is a diagram illustrating an ACK scheme used in a general MAC protocol;

4 is a diagram showing a mobile communication system according to a preferred embodiment of the present invention;

5 illustrates a frame structure of a MAC protocol according to an embodiment of the present invention;

6 is a view showing the configuration of a DownLink according to a preferred embodiment of the present invention;

7 is a diagram illustrating a process of performing a polling request in REQ_Poll according to an embodiment of the present invention;

8 is a view showing a configuration of an UpLink according to an embodiment of the present invention;

9 is a diagram illustrating an example of a response and a request process in REQ_Poll and UpLink when performing data communication between a transmitting wireless base station and a receiving wireless base station;

10 is a diagram illustrating a structure of an uplink to which an ACK is applied.

<Description of Symbols for Main Parts of Drawings>

410: transmitting wireless base station 430: receiving wireless base station

431: first receiving wireless base station 433: second receiving wireless base station

435: third receiving wireless base station 437: fourth receiving wireless base station

439: fifth receiving wireless base station 450: mobile communication terminal

460: wireless communication network 470: Internet network

510: map field 513: base station field

514: map list 516a: ID list field

516b: Locator Field 516c: Rate Field

530: downlink field 531, 532, 533: downlink subframe

550: Poll request fields 551, 553, 555, 557: Poll request

552, 554, 556, 558: polling response 570: uplink field

571, 572, and 573: subframe 572a: frame control field

572b: Receipt address field 572c: Sender address field

572d: Body field 572e: Frame order field

572g, 573g: Piggyback Request Field

575, 576, 577, 578, 579: ACK bitmap field

The present invention relates to a wireless communication system supporting the MAC protocol between fixed wireless access equipment and a fixed wireless access equipment therefor. More specifically, in order to efficiently transmit data in a wireless LAN system, the WLAN MAC standard of a time division multiple access (TDMA) method is based on a polling request method and a piggyback request. The present invention relates to a wireless communication system supporting a MAC protocol between fixed wireless access devices that improves data transmission efficiency between fixed wireless access devices by applying a piggyback request method and a piggyback ACK, and a fixed wireless access device for the same. .

The WLAN system is based on a narrow band, but uses a transmission technology that uses a frequency spreading technology in a wide band, and mainly uses an Industrial-Scientific-Medical (ISM) band. The ISM bands designated for industrial, scientific and medical use include the frequency bands 902-928 MHz, 2.4-2.4835 GHz and 5.725-5.850 GHz. In the case of the ISM band, many wireless LAN products are used because no authorization procedure is required, but compatibility between the products has emerged as a problem. In order to solve this problem, the standardization of wireless LAN is progressed, and 802.11 series standard is made through Institute of Electrical and Electronic Engineers (IEEE), and HyperLAN standard is established in European Telecommunications Standards Institute. Stadards Institute (ETSI).

Among them, the hyperlan standard has already died in the market, and in general, the wireless LAN means the 802.11 series standard.

The role of the MAC layer, which is being standardized with the physical layer in wireless data communication, especially in a WLAN environment, is to allow multiple stations to access a shared channel. The primary approach used in the 802.11 standard is the carrier-based Carrier Sense Multiple Access / Collision Avoidence L CSMA / CA, and the HyperLAN standard is time division multiple access. Multiple Access (TDMA) method is used.

1 is a diagram illustrating a frame structure of a general MAC protocol used in the 802.11 standard.

Referring to FIG. 1, a general MAC protocol includes a frame control field including type or fragmentation information for a corresponding frame, association identity (AID) information in power saving mode, and in other cases, respectively. It includes a Duration / ID field, four Address fields, a Sequence Control field, a Frame Body field, and a Cyclic Redundancy Check (CRC) field having a different Duration value according to the frame type.

Here, the four address fields have a value as shown in FIG. 2 in combination with ToD and FromDS in a BSSID, a destination address (DA), a source address (SA), a receiver address (RA), and a frame control field.

FIG. 2 is a diagram illustrating the value of an address field according to the MAC protocol. The reason for having the structure as shown in FIG. 2 is that the Ad-hoc mode and the power saving mode are supported, and carrier sense multiple access / collision prevention is performed. / Collision Avoidance: to support CSMA / CA).

However, although the structure of the conventional MAC protocol improves reliability in data communication between a fixed base station and a mobile mobile terminal, in the data communication between a fixed base station and a base station that does not require an ad hoc mode or a power saving mode, The four Address fields, or fields such as Duration / ID, act only as a load. Therefore, the structure of the conventional MAC protocol is inadequate for data communication of a fixed base station using an efficient TDMA scheme.

FIG. 3 is a diagram illustrating an ACK method used in a general MAC protocol, which is basically a stop-and-wait method, which is widely used because of high variability and high error rate in wireless data communication.

Referring to FIG. 3, a short interface time (SIFS) occurs between a data DATA transmission and an ACK transmission at a predetermined interval. This is to prevent the other radio access equipment that has waited for a long time to use the medium to request the use of the medium. The actual maximum transmit rate in the MAC layer in which the general MAC protocol is used is obtained as shown in [Equation 1].

는 데이터 전송 시간,

은 ACK 전송시간, τ는 전달 지연(Propagation Delay),

는 DIFS(DCF Interface Time)의 길이,

는 SIFS의 길이,

은 Minimun Backoff Window Size 및

은 슬롯간격을 의미한다.Where MaxThru is the theoretical maximum data rate,

Is the data transfer time,

Is the ACK transmission time, τ is the propagation delay,

Is the length of DIFS (DCF Interface Time),

Is the length of the SIFS,

Minimun Backoff Window Size and

Means slot interval.

However, the conventional MAC protocol is useful for data communication between a fixed base station and a mobile communication terminal requiring a link having a high variability in the radio link and a high error rate in a stop-and-wait manner. In the case of reliable data communication between the fixed base station and the fixed base station, there is a problem that SIFS acts as a delay factor between data transmission and ACK transmission.

In order to solve the above problems, the present invention provides a time division multiple access (TDMA) instead of a conventional MAC (Media Access Control) for efficient data transmission in a WLAN system. Wireless LAN that improves data transmission efficiency between fixed wireless access devices by applying Polling Request method, Piggyback Request method and Piggyback ACK based on Wireless LAN MAC standard It is an object of the present invention to provide a wireless communication system supporting the MAC protocol between LAN systems and fixed wireless access equipment therefor.

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Accordingly, according to a first object of the present invention, polling is performed based on a WLAN MAC (Media Access Control) standard of a time division multiple access (TDMA) scheme for efficient data transmission in a wireless LAN system. A system using a MAC protocol between fixed wireless access devices that improves data transmission efficiency between fixed wireless access devices by applying a polling request method, a piggyback request method, and a piggyback ACK method. An internet network connecting a plurality of computers to provide a data providing service; A wireless communication network connected to the Internet network for relaying data transmission; A transmitting wireless base station connected to a wireless communication network and transmitting data received from the Internet network using a MAC protocol; A receiving wireless base station receiving data from the transmitting wireless base station; And a mobile communication terminal receiving data from a receiving wireless base station and receiving a data service.
According to a second object of the present invention, a wireless access device that is installed in a base station connected to a wireless communication network to connect or receive data between base stations, the wireless access device for efficient data transmission in a wireless LAN (Wireless LAN) system Based on TDMA (Time Division Multiple Access) wireless LAN MAC (Media Access Control) standard, Polling Request method, Piggyback Request method and Piggyback ACK The MAC protocol using the method is used, but the polling request method is a polling request for confirming a data transmission request between the radio base stations and a polling response according to the polling request, and the piggyback request method is data transmitted by the radio base station. At the same time as the transmission of the data transmission method for reserving the required amount of transmission to be used next time It provides a fixed wireless access equipment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

4 is a diagram illustrating a mobile communication system according to a preferred embodiment of the present invention.

A mobile communication system according to a preferred embodiment of the present invention includes a transmitting wireless base station 410, a receiving wireless base station 430, a mobile communication terminal 450, a wireless communication network 460 and the Internet network 470.

The transmitting radio base station 410 includes a fixed radio access equipment (not shown), and transmits and receives data with at least one receiving radio base station 430.

The receiving wireless base station 430 includes a fixed wireless access equipment (not shown), and transmits and receives data with the mobile communication terminal 450.

Here, the transmitting wireless base station 410 and the receiving wireless base station 430 perform wireless data communication using respective fixed wireless access equipment. Herein, the wireless data communication is data communication using the MAC protocol proposed by the present invention.

In addition, although the preferred embodiment of the present invention has described wireless data communication between one transmitting wireless base station 410 and at least one receiving wireless base station 430, it is not limited thereto. In the preferred embodiment of the present invention, wireless data communication between the base transceiver stations 410 and 430 is described, but the present invention may be applied to a base station and a repeater including a fixed radio access equipment.

The mobile communication terminal 450 is a terminal capable of data communication using a mobile communication network, and includes a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a global system for mobile (GSM) phone, and a W-CDMA. (Wideband CDMA) phones, CDMA-2000 phones, Mobile Broadband System (MBS) phones, notebook computers, and the like.

The wireless communication network 460 is connected to the Internet network 470 and relays data transmission between the Internet network 470 and the transmitting wireless base station 410.

The internet network 470 provides a data communication service when a data communication request is made in the mobile communication terminal 450.

FIG. 5 is a diagram illustrating a frame structure of a MAC (Media Access Control) protocol according to a preferred embodiment of the present invention.

The frame of the MAC protocol according to the preferred embodiment of the present invention includes a MAP field (MAP field, hereinafter referred to as 'MAP') 510, a downlink field (hereinafter, referred to as 'DownLink') 530, and a poll request. Field (Request Poll Field, hereinafter referred to as 'REQ_Poll') 550, and uplink field (UpLink Field, hereinafter referred to as 'UpLink') 570, and the like.

Referring to FIG. 5, the MAC protocol according to the preferred embodiment of the present invention divides the downlink 530 and the uplink 570 according to a time unit in a time division duplex (TDD) manner according to time units. To allow data communication between In addition, the downlink 530 and uplink 570 of a frame of one MAC protocol are each composed of several sub-frames, and the length of the sub-frame is 4 symbols according to the 802.11a physical layer. Since it is, it has a variable length of 8, 16, 32 위해서 to facilitate mapping in the physical layer. In addition, the number of subframes included in the frame of one MAC protocol can support a variable length in order to effectively support a variety of data rates, it is preferable to include up to 4,095 in the preferred embodiment of the present invention.

The MAP 510 is a field containing the location and configuration information of the downlink 530 and uplink 570 subframes included in the frame of the MAC protocol. The MAP 510 corresponds to a data transmission request amount required for data communication with an external wireless base station. Accordingly, the size of the downlink 530 and uplink 570 is dynamically adjusted.

The MAP 510 may be referred to as a base station identification field (hereinafter referred to as a BS ID) 513 and at least one map list field (MAP List Field: Mobile Application Part List Field, hereinafter referred to as a 'MAP List'). 515) or the like.

BS ID 513 is a field containing ID (Identification) information of wireless full-speed equipment (not shown) of wireless base stations 410 and 430 transmitting frames.

The MAP List 514 consists of several fields 515, 516, ... containing the location and configuration information of the subframes in the DownLink 530 and UpLink 570. In addition, the MAP List 514 may include a List Identification Field (hereinafter referred to as "List ID") 516a, a Locator field (Locator) and a Rate field (RATE), respectively. 516c), and the like.

The List ID 516a is a field containing ID information of the radio access equipment of the radio base station 410 or 430 that is to receive or attempt to transmit a subframe when performing data communication. Contains side identification information.

Locator 516b is a field that specifies a position where subframes of DownLink 530 and UpLink 570 start within DownLink 530 and UpLink 570. The size of this field is preferably 12 bits.

The RATE 516c is a field in which information for decoding the subframes of the DownLink 530 and the UpLink 570 is stored, and the size of the field is preferably 6 bits.

6 is a diagram showing the configuration of a DownLink according to a preferred embodiment of the present invention.

Referring to FIG. 6, the downlink 530 is a frame in which data DATA transmitted from a transmitting wireless base station 410 to a receiving wireless base station 430 is stored, and each data is an UpLink Sub-Frame 531, 532,. ..) stored in the form of a field.

The REQ_Poll 550 is a size of bandwidth or transmission rate required for each fixed radio transmitter to support efficient resource demand and resource allocation between the stationary radio transmitters of the radio base stations 410 and 430 in radio communication. A field for requesting subframe allocation based on information on. In the proposed method, the REQ_Poll 550 may support both a piggyback request method and a polling request method, but it is preferable to use a polling request method in the REQ_Poll 550 as a preferred embodiment of the present invention. Do.

7 is a diagram illustrating a process of performing a polling request in REQ_Poll according to an exemplary embodiment of the present invention. In the preferred embodiment of the present invention, a description will be given of an execution process when the transmitting radio base station 410 requests data to three receiving radio base stations 430 for convenience of description.

Referring to FIG. 7, a polling response (hereinafter referred to as a 'polling response') is performed by a receiving wireless base station 430 that receives a polling request of a transmitting wireless base station 410 during a polling interval P _time. Indicates. Here, the polling interval P _time means a time interval from when a polling request occurs to the next polling request that occurs. As shown in FIG. 7, when the transmitting radio base station 410 needs to receive data from the receiving radio base station 430, the transmitting radio base station 410 transmits Polling Request 1 551 to the receiving radio base station 430. The first receiving wireless base station 431 that receives the Polling Request 1 551 transmits the Polling Response 1 552 to the transmitting wireless base station 410 in response to the Polling Request 1 531. Here, Polling Response 1 552 includes information on a service type and a transmission request amount that a receiving radio access device wants to receive from a transmitting radio access device. Similarly, when the transmitting radio base station 410 sends polling requests 553 and 555 requesting data to the second receiving radio base station 433 and the third receiving radio base station 435, the radio receiving the polling request 553 and 555 is received. Receiving base stations 433 and 435 transmit polling requests 553 and 554 to the transmitting radio base station 410 within the polling interval P _time for polling responses 554 and 556 according to polling requests 553 and 555. .

Therefore, through this process, the receiving wireless base station 430 informs the transmitting wireless base station 410 that the data is to be transmitted using the next frame in advance, and through this, the transmitting wireless base station 410 receives the receiving wireless base station. The required transmission amount for the data to be uploaded to 430 is confirmed and responded.

In addition, the REQ_Poll 550 section may be used as a section in which the new receiving radio base station 430 may perform an association process informing the transmitting scaring base station 410 that it has newly subscribed.

The UpLink 570 is a frame in which data DATA transmitted from the receiving wireless base station 410 to the transmitting wireless base station 430 is stored.

8 is a diagram illustrating a configuration of an UpLink according to a preferred embodiment of the present invention.

Referring to FIG. 8, the uplink 570 includes at least one subframe 571, 572,..., For convenience of description. 572), the Sub-Frame 2 (572) is a Frame Control Field (hereinafter referred to as "Frame Control") (572a), a Receive Address Field (RA Field: hereinafter referred to as "RA") 572b), a transmission address field (SA field: Source Address Field, hereinafter referred to as 'SA') 572c, a body field (hereinafter, referred to as 'Body'), 572d, and a frame check sequence value Field (FCS Field: Frame Check Sequence Field, hereinafter referred to as 'FCS') 572e.

The Frame Control 572a is a field including control information for the Sub-Frame 2 572 and includes Type or Fragmentation information for the Sub-Frame 2 572.

The RA 572b is a field for storing an address of radio access equipment of the receiving radio base station 430 that receives data when performing wireless data communication between the radio base stations 410 and 430.

The SA 572c is a field for storing an address of radio access equipment of the transmitting radio base station 430 that transmits data when performing radio data communication between the radio base stations 410 and 430.

Body 572d is a field in which contents of data to be transmitted / received are stored, and its length is variable according to the size of data.

The FCS 572e is a field for detecting an error of the Sub-Frame 2 572. In the preferred embodiment of the present invention, the FCS 572e is a cyclic redundancy check (CRC) having a size of 32 bits.

9 is a diagram illustrating an example of a response and a request process in REQ_Poll and UpLink when performing data communication between a transmitting wireless base station and a receiving wireless base station.

9, FIG. 9 illustrates the MAC protocol when the transmitting radio base station 410 requests the sub-frames 571, 572, and 573 storing data to the receiving radio base station 430 according to the preferred embodiment of the present invention. The polling request method and the piggyback request method are used in the REQ_Poll 550 and the UpLink 570 to indicate that data communication is performed. In FIG. 9, data communication between one transmitting wireless base station 410 and five receiving wireless base stations 430 is assumed for convenience of description.

Polling request scheme used in the preferred embodiment of the present invention is that the radio access equipment of the receiving radio base station 430 of each Sub-Frame (571, 572, ...) when transmitting data using the UpLink (570) At the end, a Piggyback Request (hereinafter referred to as a 'Piggyback Request') stored with a Resource Request Message is added to the transmitting radio base station 410 that the receiving radio base station 430 will transmit data next time. It informs you to shorten the time required for resource transmission.

Referring to the REQ_Poll 550 and the UpLink 570 of FIG. 9, the transmitting radio base station 410 transmits the polling requests 551 and 557 to the first radio base station 431 and the fourth radio base station 437 through the REQ_Poll 550. ) And the first wireless base station 431 and the fourth wireless base station 437 receive the Polling Respone (552, 558) to confirm the response and the required transmission amount to upload data in the next frame. A third wireless base station 433 that uploads data using the UpLink 570, a third wireless base station 435, and a third wireless base station 439 that are scheduled to upload data in the next frame. The wireless base station 435 and the fifth wireless base station 439 send a Piggyback Request (572g, 573g) including information on the amount of data required for the next data to be transmitted next to the sub-frames 572 and 573 to which they are to be transmitted. In addition, it transmits to the transmitting mobile communication terminal 410.

Therefore, among the radio base stations 430 of the first to fifth radio stations 431, 435, 437, and 439 except for the second radio base station 433, data to be transmitted to the transmitting radio base station 410 is also transmitted in the next frame. If present, the first wireless base station 431 and the fourth wireless base station 437, which are not scheduled to be transmitted in the current frame, use a polling request scheme to request a required amount of transmission to be used in the next frame and to transmit data in the current frame. The radio base station 435 and the fifth radio base station 439 add Piggyback Requests 572g and 573g to the end of the Sub-Frames 571, 572, and 573 to transmit to reserve the necessary transmission amount to be used in the next frame.

10 is a diagram illustrating a structure of an uplink to which an ACK is applied.

Referring to FIG. 10, FIG. 10 illustrates an UpLink 570 of a MAC protocol frame to which a Selective ACK scheme is applied for efficient wireless data communication. As shown in FIG. 10, an ACK bit map (hereinafter referred to as an 'ACK MAP') 575, 576, 577, 578, and 579 is attached to a sub-frame 571, 572, and 573 to be transmitted. 410 may confirm whether or not the sub-frames 571, 572, and 573 of the reception wireless base stations 433, 435, and 439 are normally received.

The maximum transmittable rate of the MAC protocol according to the preferred embodiment of the present invention is shown in [Equation 2].

는 데이터 전송 시간,

는 데이터의 ACK 전송시간, τ는 전달 지연(Propagation delay),

은 MAP(510) 에서의 DownLink(530) 및 UpLink(570)의 데이터를 전송하기 위한 Sub-Frame들의 MAP 정보를 전송하는 데 걸리는 평균시간,

은 해당 무선 기지국의 무선 접속 장비가 UpLink(570)를 이용하여 데이터를 전송하고자 할 때 REQ_Poll(550)에서 전송 요청을 수행하는 데 걸리는 평균 시간을 의미한다.here,

Is the data transfer time,

Is the ACK transmission time of the data, τ is the propagation delay,

The average time taken to transmit the MAP information of the sub-frames for transmitting the data of the DownLink 530 and UpLink 570 in the MAP 510,

Denotes an average time taken by the wireless access equipment of the corresponding wireless base station to perform a transmission request in the REQ_Poll 550 when transmitting data using the UpLink 570.

Therefore, comparing the maximum transmittable transmission rate in the MAC layer conventionally used between wireless base stations and the maximum transmittable transmission rate in the MAC layer of the MAC layer structure according to the preferred embodiment of the present invention improves by a multiple of [Equation 3]. In theory, the maximum transmit rate is improved by 31% when 1 kbyte of data is transmitted using the 802.11a physical layer and physical layer parameters.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, a polling request scheme and a piggyback are based on a WLAN MAC protocol of a time division multiple access (TDMA) scheme for efficient data transmission in a WLAN system. Piggyback request method is applied to increase the data transmission efficiency between fixed wireless access equipment.

Claims (35)

delete delete delete delete delete delete delete delete delete delete delete For efficient data transmission in wireless LAN system, it is based on MAC (Media Access Control) standard of Time Division Multiple Access (TDMA) type, Polling Request method and Piggyback request. It is a system using MAC protocol between fixed wireless access devices to improve data transmission efficiency between fixed wireless access devices by applying (Piggyback Request) method, An internet network connecting a plurality of computers to provide a data providing service; A wireless communication network connected to the internet network to relay transmission of the data; A transmitting wireless base station connected to the wireless communication network and transmitting the data received from the Internet network using a MAC protocol; A receiving wireless base station for receiving the data from the transmitting wireless base station; And A mobile communication terminal receiving the data from the receiving wireless base station and receiving a data service Wireless communication system that supports the MAC protocol between fixed wireless access equipment comprising a. The method of claim 12, wherein the MAC protocol is A map field for storing position and configuration information of a sub-frame; A downlink field including one or more first subframes each of which download data DATA transmitted from a transmitting wireless base station to a receiving wireless base station is stored; A poll request field for storing information on a bandwidth or a rate ratio required for radio transmission equipment of the transmitting radio base station and the receiving radio base stations; And An uplink field including one or more second subframes storing upload data DATA transmitted from the receiving wireless base station to the transmitting wireless base station Wireless communication system that supports the MAC protocol between fixed wireless access equipment comprising a. The method of claim 13, wherein the map field is The wireless protocol supporting the MAC protocol between the fixed radio access equipment, characterized in that for adjusting the size of the downlink field and the uplink field according to the data transmission requirements required when the transmitting radio base station and the receiving radio base station data communication. Communication system. 15. The method of claim 13 or 14, wherein the map field is A base station ID field for storing identification information of the fixed radio access equipment that is transmitting the frame of the MAC protocol; And At least one map list field for storing position and configuration information of the first subframe of the downlink field or the second subframe of the uplink field Wireless communication system that supports the MAC protocol between fixed wireless access equipment comprising a. The method of claim 15, wherein the map list field, An ID list field for storing ID information of the fixed radio access equipment in which data communication is performed; A locator field for designating a position at which the first subframe of the downlink field or the second subframe of the uplink field starts; And Rate field for storing information for decoding the first subframe of the downlink field or the second subframe of the uplink field Wireless communication system that supports the MAC protocol between fixed wireless access equipment comprising a. 14. The method of claim 13, wherein the poll request field is Fixed radio access equipment, characterized in that configured in accordance with the Polling Request (Polling Request) method of sending a polling request to each other within the polling interval and the polling request when the transmitting radio base station and the receiving radio base station communicates data; Wireless communication system that supports the MAC protocol. 18. The method of claim 17, wherein the polling interval is And a time interval from the time when the polling request occurs to the time when the next polling request occurs, and having a predetermined interval, the wireless communication system supporting the MAC protocol between fixed wireless access equipment. The method of claim 13, wherein the uplink field is A frame control field in which a type and fragmentation information of the second subframe are stored; A Receive Address field in which an address of the radio access equipment of the receiving radio base station receiving the second subframe is stored; A Source Address field that stores an address of the radio access equipment of the transmitting radio base station transmitting the second subframe; A body field in which contents to be transmitted or received are stored; And Frame Check Sequence field for detecting an error of the second subframe Wireless communication system that supports the MAC protocol between fixed wireless access equipment comprising a. The method of claim 13, wherein the uplink field is A wireless communication system supporting the MAC protocol between fixed wireless access devices, further comprising a piggyback request field for reserving a required amount of transmission to be used for next data transmission. 21. The method of claim 13 or 20, wherein the uplink field is A wireless communication system supporting the MAC protocol between fixed radio access equipment, characterized in that it further comprises a Selective ACK (ACK) field for efficient wireless data communication. The method of claim 12, wherein the MAC protocol is The uplink field and the downlink field are divided according to time units, and the time division duplex (TDD: Time Division Dupulex) scheme for performing data communication between the wireless base stations. Communication system. The method of claim 12, wherein the maximum transmittable rate of the MAC protocol is

Is the data transfer time,

Is the ACK transmission time of the data, τ is the propagation delay,

Is an average time taken to transmit MAP field information of the subframe for transmitting data in the downlink field and the uplink field in the MAP field,

Is an average time taken to perform a transmission request in a poll request field when the radio access equipment of the corresponding transmitting or receiving base station wants to transmit the data using the uplink field.

A wireless communication system supporting the MAC protocol between fixed wireless access equipment, characterized in that. A wireless access equipment installed in a base station connected to a wireless communication network to connect or receive data between the base stations, The wireless access equipment is based on a WLAN MAC (Media Access Control) standard of a time division multiple access (TDMA) scheme for efficient data transmission in a wireless LAN system, and a polling request. MAC protocol using the method and piggyback request method, The polling request method is a method of performing a polling request for requesting data between wireless base stations and a polling response according to the polling request. The piggyback request method is a method of reserving required data to be used for the next data transmission while transmitting data transmitted from a wireless base station. Fixed wireless access equipment characterized by the above. The method of claim 24, wherein the MAC protocol is A map field for storing position and configuration information of a sub-frame; A downlink field including one or more first subframes each of which download data DATA transmitted from a transmitting wireless base station to a receiving wireless base station is stored; A poll request field for storing information on a bandwidth or a rate ratio required for radio transmission equipment of the transmitting radio base station and the receiving radio base stations; And An uplink field including one or more second subframes storing upload data DATA transmitted from the receiving wireless base station to the transmitting wireless base station Fixed wireless access equipment comprising a. The method of claim 25, wherein the map field is And adjusting the sizes of the downlink field and the uplink field according to data transmission requirements required when the transmitting radio base station and the receiving radio base station perform data communication. 27. The method of claim 25 or 26, wherein the map field is A base station ID field for storing identification information of the fixed radio access equipment that is transmitting the frame of the MAC protocol; And At least one map list field storing position and configuration information of the first subframe of the downlink field or the second subframe of the uplink field Fixed wireless access equipment comprising a. The method of claim 27, wherein the map list field, An ID list field for storing ID information of the fixed radio access equipment in which data communication is performed; A locator field for designating a position at which the first subframe of the downlink field or the second subframe of the uplink field starts; And Rate field for storing information for decoding the first subframe of the downlink field or the second subframe of the uplink field Fixed wireless access equipment comprising a. 26. The method of claim 25, wherein the poll request field is Fixed radio access equipment, characterized in that configured in accordance with the Polling Request (Polling Request) method of sending a polling request to each other within the polling interval and the polling request when the transmitting radio base station and the receiving radio base station communicates data; . 30. The method of claim 29, wherein the polling interval is And a fixed time interval from the time when the polling request occurs to the time when the next polling request occurs, and having a fixed value. 27. The method of claim 25, wherein the uplink field is A frame control field in which a type and fragmentation information of the second subframe are stored; A Receive Address field in which an address of the radio access equipment of the receiving radio base station receiving the second subframe is stored; A Source Address field that stores an address of the radio access equipment of the transmitting radio base station transmitting the second subframe; A body field in which contents to be transmitted or received are stored; And Frame Check Sequence field for detecting an error of the second subframe Fixed wireless access equipment, characterized in that comprises a. 27. The method of claim 25, wherein the uplink field is And a piggyback request field for reserving a required amount of transmission to be used next time data transmission. 33. The method of claim 25 or 32, wherein the uplink field is The fixed radio access equipment further comprises a selective ACK field for efficient wireless data communication. The method of claim 24, wherein the MAC protocol is The uplink field and the downlink field is divided according to a time unit is a fixed time division duplex (TDD: Time Division Dupulex) method for data communication between the wireless base station. 25. The method of claim 24, wherein the maximum transmittable rate of the MAC protocol is

Is the data transfer time,

Is the ACK transmission time of the data, τ is the propagation delay,

Is an average time taken to transmit MAP field information of the subframe for transmitting data in the downlink field and the uplink field in the MAP field,

Is an average time taken to perform a transmission request in a poll request field when the radio access equipment of the corresponding transmitting or receiving base station wants to transmit the data using the uplink field.

Fixed wireless access equipment, characterized in that. .

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