KR20060065354A - Mac organization device and, uplink and downlink method thereof - Google Patents

Abstract

The present invention provides a MAC layer configuration apparatus of a wireless Internet system capable of high-speed data transmission so that a plurality of subscribers to meet the needs of the subscriber.

An apparatus for configuring a MAC layer according to an aspect of the present invention is an apparatus for configuring a MAC layer between an upper layer and a physical layer in a wireless Internet system. The MAC layer configuration apparatus includes a quick response function, a block repetition function block, a time adjustment function block and a management function block. The quick response function block is interfaced with a higher layer and converts frame data into necessary information in the physical layer based on a control message transmitted from the upper layer. The repeating function block inserts and checks an error correction code for frame data, and performs encryption and decryption on transmitted and received frame data. The time adjustment function block is interfaced with the physical layer and transmits frame data and control messages at the time required by the physical layer in synchronization with the physical layer. The management function block is interfaced with the upper layer, and observes the status of the quick response function block, the repeat function block and the time adjustment function block, collects information on the abnormal state, and delivers it to the upper layer.

MAC, Wireless Internet, Uplink, Downlink

Description

MAC layer construction apparatus and its downlink and uplink performing method {MAC organization device and, uplink and downlink method}

1 is a view schematically showing a conventional wired communication network.

2 is a diagram schematically illustrating a configuration of a wireless communication network.

3 is a diagram schematically illustrating a hierarchical structure used in a base station and a terminal in a wireless Internet system.

4 is a diagram illustrating a configuration of an apparatus for configuring a MAC layer according to an embodiment of the present invention.

5 is a view showing a downlink process performed in the MAC layer configuration apparatus according to an embodiment of the present invention in order.

6 is a diagram illustrating an uplink process performed in an apparatus for configuring a MAC layer according to an embodiment of the present invention in order.

The present invention relates to a wireless Internet system, and more particularly, to an apparatus for implementing a medium access control (MAC), an apparatus for configuring a MAC layer, and a method for performing downlink and uplink thereof in a wireless internet system.

Conventionally, bidirectional communication has been performed through a wired communication network.

1 is a view schematically showing a conventional wired communication network.

As shown in FIG. 1, the control station 100, the plurality of base stations 110, and a plurality of subscribers provided with services from each base station are connected to each other by wire to perform bidirectional communication. In such a wired communication network, each subscriber 120 is given a fixed bandwidth according to the initial facility rather than a bandwidth according to the service. The bandwidth required for a given service can depend on the information rate and the quality of service required by these services. For example, T1 (Time Division Multiplexing, Level 1) -type continuous data services typically require multiple bandwidths with well-controlled transport waits, with constant bandwidth for each of these frames until service termination. Requires placement. In contrast, certain types of data services, such as Internet Protocol Data Services (TCP / IP), have a lot of data at the moment, and often require a function to delay deviations between breaks and activities.

Therefore, in the typical communication network configuration as described above, when there are variable and instantaneous data requirements such as the Internet, it is difficult to vary the bandwidth according to the service when all the subscribers are connected by wire, and the cost of the facility expansion for a few subscribers Burden difficulties arise. In addition, there is a problem that can not be guaranteed for the data rate due to the bandwidth limitation due to the increase in subscribers.

In order to solve this problem, a wireless communication network has been developed that can be connected wirelessly between the base station and the subscriber.

2 is a diagram schematically illustrating a configuration of a wireless communication network wirelessly connected between a base station and a subscriber.

As shown in FIG. 2, the control station 200 and the base station 210 are connected by wire, and the base station 210 and the subscriber 220 are wirelessly connected to perform two-way communication.

As shown in FIG. 2, since each base station 210 and the subscriber 220 are wirelessly connected through an antenna, wired installation costs are eliminated due to an increase in subscribers, and bandwidth limitations due to installation are also eliminated. Thus, by providing various services such as voice, data and video, it is possible to provide improved broadband service, adjust the bandwidth of each subscriber based on the type and quality of service requested by the customer, Types of service and quality are varied and selectable,

Therefore, the base station 210 of such a wireless Internet system should provide a variety of on-demand bandwidth of the plurality of subscribers 220, bandwidth arrangement and adjustment based on the type and quality of service of the customer requested to the base station 210, Different band services must be adapted to meet different bandwidth and standby needs.

The transmission rate of the physical layer in the wireless Internet system of the broadband high-speed data transmission as described above is 6 ~ 54 Mbps in IEEE 802.11a, 50 Mbps or more in IEEE 802.16. Therefore, although high-level frame scheduling is important for high-speed data processing, a MAC (Media Access Control) layer that connects the upper layer and the physical layer and concentrates resources is more important.

The technical problem to be achieved by the present invention is to provide a MAC layer configuration apparatus of a wireless Internet system capable of high-speed data transmission to meet the needs of a plurality of subscribers.

Another object of the present invention is to provide a message transfer method between an upper layer and a physical layer that can effectively prevent data loss.

An apparatus for configuring a MAC layer between an upper layer and a physical layer in a wireless Internet system according to an aspect of the present invention,

A quick response function block interfacing with the upper layer and converting frame data into information required by the physical layer based on a control message transmitted from the upper layer; A repeating function block for inserting and checking an error correction code for the frame data and performing encryption and decryption on transmitted and received frame data; A time adjustment function block interfacing with the physical layer and transmitting frame data and a control message at a time required by the physical layer in synchronization with the physical layer; And a management function block which is interfaced with the upper layer, observes the state of the quick response function block, the repetition function block and the time adjustment function block, collects information on an abnormal state, and delivers the information about the abnormal state to the upper layer.

The quick response function block may include: an upper interface unit configured to receive information from the upper layer and analyze the information to separate whether the input data is a control message or a traffic, and to perform a buffer function for data that is densely packed; And an interrupt generator configured to generate an interrupt to transmit data transferred from the physical layer to the upper layer.

The repeating function block may include a CRC generation unit for adding a CRC to data traffic received from the upper layer according to the setting of the upper layer; A CRC checker configured to check the CRC of the data traffic received from the physical layer and transmit or discard the input data to a higher layer; An encryption unit for encrypting data using an encryption key received from the upper layer to protect traffic data; And a decryption unit that performs a function of decrypting encrypted data transmitted from the physical layer.

The time adjustment function block is directly interfaced with the physical layer, transmits frame information and traffic data at a time required by the physical layer so that channel coding of the physical layer is possible for each frame, and notifies completion of frame transmission and reception. The physical layer interface unit performs a function of generating a control signal and a function of receiving data at a time required by the physical layer and transferring the data to a higher layer; And a synchronization unit for tracking synchronization of the physical layer to perform synchronization.

A downlink performing method according to another aspect of the present invention is a downlink performing method of transferring data from the upper layer to the physical layer in a MAC configuration device constituting a MAC layer between an upper layer and a physical layer.

a) receiving a control message indicating frame data and a frame structure at the upper layer; b) generating a control message for the physical layer based on the received control message; c) checking whether register setting using the control message required for the physical layer is completed and whether frame data reception is completed; d) converting the received frame data based on a control message required for the physical layer; And e) transmitting the converted frame data to the physical layer after receiving a signal acceptable at the physical layer.

According to another aspect of the present invention, an uplink performing method is an uplink performing method of transferring data from the physical layer to an upper layer in a MAC configuration device constituting a MAC layer between an upper layer and a physical layer.

a) receiving a control message indicating a frame structure at the upper layer and receiving frame data from the physical layer; b) generating a control message for the physical layer based on the received control message; c) checking whether register setting using the control message required for the physical layer is completed and whether frame data reception is completed; d) converting the received frame data based on a control message required for the physical layer; And e) generating an interrupt signal for the upper layer to accept and transmitting the frame data to the upper layer in accordance with the interrupt signal.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

First, FIG. 3 is a diagram schematically illustrating the configuration of a base station 210 and a terminal 220 in a wireless Internet system.

As shown in FIG. 3, the base station 210 includes an upper control layer unit 310, a MAC layer unit 311, and a physical layer unit 312. The upper control layer unit 310 processes the data so as to classify and transmit the message according to the service and transmits it to the MAC layer unit 311. The MAC layer 311 interfaces with the physical layer 312 and performs encryption for generation of control messages and data protection required by the physical layer 312 and transmits frame data at the request of the physical layer. The physical layer unit 312 includes a MODEM unit 313 which converts data for protecting data in a wireless environment, and an RF unit 314 having a data transmission function over the air.

The terminal 220 includes an upper control layer unit 320, a MAC layer unit 321, and a physical layer unit 322. When a user accesses the Internet using a monitor, a keypad, a camera, or the like, or connects a terminal to connect with another subscriber, the upper control layer unit 320 classifies and transmits a message according to a service at a time through a user interface. The data is processed to be transmitted to the MAC layer unit 321. The MAC layer unit 321 interfaces with the physical layer unit 322 and performs encryption for generation of control messages and data protection necessary for the physical layer, and transmits frame data at the request of the physical layer. The physical layer unit 312 includes a MODEM unit 323 which converts data for protecting data in a wireless environment, and an RF unit 324 having a data transmission function over the air.

The user data transmitted from the terminal 220 is received by the physical layer unit 312 of the base station 210, the MAC layer 311 restores the encrypted data, and performs data separation by service while interfacing with the upper layer. The collected data is made accessible to the control station 200 of the CN (Core Network) or private network. At this time, since the data coming from the various terminals (or subscribers) 220 should be separated from the MAC layer unit 311 according to the data service type, the MAC layer unit 311 operates at the same speed as the physical layer unit 312. Real-time service is possible when you do this.

4 is a diagram illustrating a configuration of a MAC layer unit 311 which is a MAC layer implementing apparatus for implementing a medium access control (MAC) layer of a base station 210 according to an embodiment of the present invention.

As shown in FIG. 4, the MAC layer unit 311 includes a fast response function block (FRFB) 410, a repeating function block (RPFB) 420, and a time adjustment function block (TJFB). Time Just Function Block (430) and Management Function Block (MCMB: MAC Control / Maintenance Block) 440.

 The FRFB 410 includes an upper interface unit 411 and an interrupt generator 412. The upper interface 411 connects with the upper layer, receives information from the upper layer, analyzes the information, and separates whether the input data is control data or traffic, and performs a buffer function for data that is densely packed. If the input signal is a control signal, the MAC register is updated to match the control signal, the control signal is transmitted to the physical layer, and if the separated data is traffic, the control signal and the traffic header information are input to the appropriate queue. Perform the function. In addition, the interrupt generator 412 generates an interrupt for transferring data transferred from the physical layer to a higher level.

The RPFB 420 includes a header generation unit 421, a header identification unit 422, an encryption unit 423, a decoding unit 424, a CRC generation unit 425, and a CRC identification unit 426, and the flow of data. Perform high-speed repetitive work so as not to disturb.

The header generator 421 adds a header to the data traffic received from the upper layer according to the setting of the upper layer, and the header checker 422 confirms the header of the data traffic received from the physical layer. The encryption unit 423 encrypts the data using the encryption key received from the upper layer for the protection of the traffic data, and the decryption unit 424 performs the function of decrypting the encrypted data transmitted from the physical layer. The CRC generation unit 425 adds a cyclic redundancy check (CRC) to the data traffic received from the upper layer according to the setting of the upper layer, and the CRC checking unit 426 examines the CRC of the data traffic received from the physical layer. Performs the transfer or discard function to the upper layer of the input data.

The TJFB 430 includes a physical layer interface unit 431 and a synchronization unit 432. The physical layer interface unit 431 is in direct interface with the physical layer, and transmits frame information and traffic data at a time required by the physical layer to enable channel coding of the physical layer every frame, and informs completion of frame transmission and reception. Create a control signal. The synchronization unit 432 has a function of receiving data at a time required by the physical layer and delivering the data to a higher layer. The synchronization of the physical layer keeps track of synchronization of the entire MAC and minimizes data loss caused by mismatch. To synchronize itself.

The MCMB 430 is a block that controls the entire internal functional block of the MAC layer unit 311, sets the control register of each block, and collects error information of each block to perform an interrupt report function at the upper level. For error correction of each functional block, there is an independent debugging interface connected to higher layers.

As such, when the MAC layer 311 is implemented as software, the high speed physical layer requirement cannot be satisfied. Therefore, the frame generation such as frame scheduling can be implemented by the upper software to be easily applied according to the frame change, the MAC layer 311 can be implemented in hardware to perform frame repetitive tasks at high speed.

Next, the operation of the MAC layer unit 311 according to the embodiment of the present invention will be described in detail with reference to FIGS. 5 and 6.

5 is a diagram illustrating a downlink execution process of the MAC layer unit 311 that delivers a message transmitted from an upper layer to a lower physical layer according to an embodiment of the present invention.

As shown in FIG. 5, first, the upper interface unit 411 of the FPFB 410 receives a control message indicating frame data and frame configuration from an upper layer (S110 and S120). The frame control message received in step S110 is a control message for downlink.

The upper interface unit 411 generates a control message necessary for the frame configuration environment setting and the physical layer based on the received control message indicating the frame configuration (S111).

In addition, the upper interface unit 411 checks whether the register setting in the MAC layer unit 311 using the control message is completed and whether frame data reception from the upper layer is completed (S130).

For example, if only a control message is input and no frame data is input, it is determined whether a predetermined time for reception has elapsed (S231). If the time has not yet expired, the upper interface unit 411 continues to receive the frame data. Then check whether the reception is complete (S230). In addition, when only a control message is input and a frame data is not input and a predetermined time for reception has elapsed (S231), the corresponding frame is discarded without being transmitted and the status of the timeout is transmitted to the upper layer through the MCMB 430. Report (S270).

In step S130, when both control information and frame data are received, the RPFB 420 performs a function according to control information such as encryption and CRC for the frame data (S140).

The physical layer interface unit 431 of the TJFB 430 stores the frame data in which the function execution is completed in step S140, and waits to receive a signal indicating that frame data can be received from the physical layer (S150).

If the waiting time for receiving the signal from the physical layer exceeds a predetermined time (S151), the corresponding frame is discarded and the status of the timeout is reported to the upper layer through the MCMB 430 (S170).

When a signal indicating that frame data can be received from the physical layer during a predetermined waiting time is received, the physical layer interface unit 431 transmits the frame data to the physical layer (S160).

In this way, the frame message transmitted from the upper layer through the MAC layer 311 is delivered to the physical layer, and if the frame has an error such as time out, the frame is discarded without being delivered to the physical layer. The error on the frame does not affect the next frame, which prevents continuous frame loss.

6 is a diagram illustrating an uplink process of the MAC layer unit 311 that delivers a message transmitted from a physical layer to an upper layer according to an embodiment of the present invention.

As shown in FIG. 6, first, the physical layer interface unit 431 of the TJFB 430 receives frame data from the physical layer, and the upper interface unit 411 of the FPFB 410 receives a control message indicating a frame configuration. (S210, S220). The frame control message received in step S210 is a control message for downlink, and its parameters are different from the frame control message received in step S110 of FIG. 5.

The upper interface unit 411 generates a control message required for the frame configuration environment setting and the physical layer based on the control message indicating the received frame configuration (S211).

In addition, the upper interface unit 411 confirms whether the register setting in the MAC layer unit 311 using the control message is completed, and the physical layer interface unit 431 of the TJFB 430 completes the reception of the frame data from the upper layer. Check (S230).

For example, if only a control message is input and no frame data is input, it is determined whether a predetermined time for reception has elapsed (S231). If the time has not yet expired, the physical layer interface unit 431 continues the frame data. Receive and confirm whether the reception is complete (S230). In addition, when only a control message is input and no frame data is input and a predetermined time for reception has elapsed (S231), the corresponding frame is discarded without being transmitted, and the state of the timeout is higher through the MCMB 430. Report to (S270).

In step S230, when both the control information and the frame data are received, the RPFB 420 performs a function according to control information such as decoding of the frame data and CRC check, and the frame data whose function execution is completed is higher. The interrupt generator 412 generates an interrupt signal so that the layer can accept it (S240).

The upper interface unit 411 waits to receive a signal indicating that frame data can be received from an upper layer (S250).

If the waiting time for receiving a signal from the upper layer exceeds a predetermined time (S251), the corresponding frame data is discarded and an error related to the state of the timeout is reported to the upper layer through the MCMB 430 (S270). .

When a signal indicating that frame data can be received from the upper layer during a predetermined waiting time is received, the upper interface unit 411 transmits the frame data to the upper layer (S260).

In this way, the frame message transmitted from the physical layer through the MAC layer 311 is transferred to the upper layer. In addition, when an error such as a time out of the frame occurs, the frame is discarded without being delivered to the physical layer, so that an error on the frame does not affect the next frame, thereby preventing continuous frame loss.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various other changes and modifications are possible.

According to the present invention, the MAC layer construction apparatus of the wireless Internet system can implement a function block repeatedly performed to process frame data at a given time in hardware to enable high-speed transmission of a large amount of data.

In addition, when a frame error occurs, discarding the frame prevents the frame error from affecting the next frame, thereby minimizing data continuous loss.

Claims (14)

In the wireless Internet system, an apparatus for configuring a MAC layer between a higher layer and a physical layer, A quick response function block interfacing with the upper layer and converting frame data into information required by the physical layer based on a control message transmitted from the upper layer; A repeating function block for inserting and checking an error correction code for the frame data and performing encryption and decryption on transmitted and received frame data; A time adjustment function block interfacing with the physical layer and transmitting frame data and a control message at a time required by the physical layer in synchronization with the physical layer; And A management function block which is interfaced with the upper layer and observes the states of the quick response function block, the repeat function block and the time adjustment function block, collects information on the abnormal state, and delivers the information to the upper layer. MAC configuration device comprising a. The method of claim 1, The quick response function block, An upper interface unit which receives information from the upper layer and analyzes the information to separate whether the input data is a control message or traffic, and performs a buffer function on the data that is densely packed; And An interrupt generator for generating an interrupt to deliver data transferred from the physical layer to the upper layer. MAC configuration device comprising a. The method of claim 1, The repeat function block, A CRC generation unit for adding a CRC to data traffic received from the upper layer according to the setting of the upper layer; A CRC checker configured to check the CRC of the data traffic received from the physical layer and transmit or discard the input data to a higher layer; An encryption unit for encrypting data using an encryption key received from the upper layer to protect traffic data; And And a decoder configured to encrypt and decrypt data transmitted from the physical layer. The method of claim 1, The time adjustment function block, Directly interfaced with the physical layer, and transmits frame information and traffic data at a time required by the physical layer to enable channel coding of the physical layer every frame, and generates a control signal for notifying completion of frame transmission and reception. A physical layer interface unit configured to receive a function and transmit data to an upper layer at a time required by the function and the physical layer; And And a synchronization unit configured to track and synchronize synchronization of the physical layer. The method of claim 4, wherein And the synchronization unit is further configured to perform a function of synchronizing itself to minimize data loss caused by synchronization with the physical layer. The method of claim 1, The management function block And a MAC configuration device for performing control register setting functions of the quick response function block, the repeat function block, and the time adjustment function block. In the downlink performing method for transmitting data from the upper layer to the physical layer in the MAC configuration device constituting the MAC layer between the upper layer and the physical layer, a) receiving a control message indicating frame data and a frame structure at the upper layer; b) generating a control message for the physical layer based on the received control message; c) checking whether register setting using the control message required for the physical layer is completed and whether frame data reception is completed; d) converting the received frame data based on a control message required for the physical layer; And e) transmitting the converted frame data to the physical layer after receiving an acceptable signal at the physical layer Downlink performing method comprising a. The method of claim 7, wherein Step d) A downlink performing method of encrypting the frame data and inserting an error detection code. The method of claim 7, wherein In step c), If the frame data is not received for a certain time, the status of the timeout is reported to the upper layer and the frame is not transmitted. The method of claim 7, wherein In step e), A method for performing downlink without discarding a corresponding frame if a signal acceptable to the physical layer is not received within a specific time in a transmission standby state for receiving an acceptable signal to the physical layer. In the uplink performing method for transmitting data from the physical layer to the upper layer in the MAC configuration device constituting the MAC layer between the upper layer and the physical layer, a) receiving a control message indicating a frame structure at the upper layer and receiving frame data from the physical layer; b) generating a control message for the physical layer based on the received control message; c) checking whether register setting using the control message required for the physical layer is completed and whether frame data reception is completed; d) converting the received frame data based on a control message required for the physical layer; And e) generating an interrupt signal for the upper layer to accept and transmitting the frame data to the upper layer in accordance with the interrupt signal; Uplink performing method comprising a. The method of claim 11, In step c), Uplink performing method for reporting a status of a timeout to the upper layer when frame data is not received for a specific time. The method of claim 11, In step e), If the frame data is not received within a specific time period after the interrupt signal is generated, the uplink performing method discards the frame without transmitting the corresponding frame data. The method of claim 11, Step d) The uplink performing method of decoding the received frame data and confirming the inserted error detection code.

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