KR101688995B1 - Method and device for communicating data based on asymmetric transmission time - Google Patents

Abstract

Various embodiments of the present invention relate to a method and a device of data communicating based on an asymmetric transmission time. According to an embodiment of the present invention, the data communication method based on an asymmetric transmission time of full-duplex communication comprises the steps of: checking whether second data received from a counterpart device is completely received before first data is completely transmitted to the counterpart device; stopping the transmission of the first data, and transmitting a response packet based on an amount of transmission remaining of the first data; and receiving third data in a smaller size than that of a transmission remaining amount of the first data from at least one neighboring device for receiving the response packet. The data communication method based on an asymmetric transmission time can improve power consumption efficiency decreased by using a busy tone.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for data communication based on asymmetric transmission time,

BACKGROUND OF THE INVENTION [0002] Various embodiments of the present invention relate to a method and apparatus for data communication, and more particularly to a method and apparatus for communicating data based on asymmetric transmission time in bi-directional communication.

Wireless LAN usage rates are rapidly increasing due to the rapid spread of mobile devices such as smart phones and tablet PCs. In order to cover the rapid increase of such wireless LAN users, the installation of a wireless LAN access point (AP) is also rapidly increasing. As a result, the environment of the wireless LAN gradually changes into a dense environment for both the wireless LAN terminal and the AP, and the communication quality experienced by the actual user is deteriorated due to the interference and the channel competition caused thereby. In IEEE 802.11, the HEW SG (High Efficiency WLAN Study Group) was launched in May 2013 with the goal of improving the actual performance of wireless LAN in indoor and outdoor dense wireless LAN terminals and AP environment. Then, in May 2014, 802.11ax TG Group) have begun full-fledged standardization work.

Here, full duplex is attracting attention as one of the core technologies of a wireless local area network (WLAN). Unlike half duplex communication, full duplex communication enables simultaneous transmission and reception of the same time and frequency resources in one device, which can improve throughput up to 2 times. The full - duplex communication MAC protocol has a problem that bidirectional communication can not be implemented when magnetic interference occurs in the physical layer. However, there are a lot of researches related to analog or digital magnetic interference cancellation to solve this problem. Also, research on MAC protocol based on self-interference cancellation has been actively conducted

Here, in most of the distributed full-duplex communication, the transmission time of data transmitted and received between different devices can be determined differently. In order to solve the problem caused by the asymmetric transmission time, busy tone (busy tone) is generally applied to the full duplex communication MAC protocol. However, although busy tone does not include data, it consumes frequency resources, which can cause performance degradation by using busy tone in communication.

Patent Document 10-1509542 includes an energy efficiency control policy configured to transition a physical layer device from a full duplex mode to a half duplex mode in which one of transmission and reception of data in a transmission medium is interrupted, The efficiency control policy is further configured to disable the cancel circuitry used by the physical layer device for at least a portion of the time the physical layer device is operating in the simplex mode, Mode to transition to a low power mode in which both transmission and reception of data in the same conductors are interrupted from the mode to the power saving mode. However, in the system and method for energy efficient Ethernet with asymmetric traffic profiles, The preamble supplied to the device of the unreceived channel There is still a limit to improving the communication efficiency by controlling the power.

10-1509542 (registered patent)

As described above, there is a need for wireless LAN MAC research to improve power consumption efficiency and data communication efficiency caused by busy tone used to prevent collision of data by transmitting / receiving data through bidirectional communication.

According to various embodiments of the present invention, in a wireless communication system of an apparatus, a data communication method and apparatus based on asymmetric transmission time can be provided in order to improve power consumption efficiency degraded due to use of busy tone.

In addition, in the wireless communication system of the apparatus, it is possible to provide a method and apparatus for data communication based on asymmetric transmission time in order to effectively use wasted channel resources due to use of busy tone.

According to an embodiment of the present invention, there is provided a method of communicating data based on an asymmetric transmission time of a full-duplex communication, the method comprising: receiving completion of reception of second data received from the counterpart apparatus before completion of transmission of the first data to the counterpart apparatus; Checking; Stopping the transmission of the first data and transmitting a response packet based on the transmission remaining amount of the first data; And receiving third data of a size smaller than the transmission remaining amount of the first data from the at least one neighboring device receiving the response packet.

According to various embodiments, a method of communicating data based on an asymmetric transmission time of a full-duplex communication includes: initiating transmission of a transmission remaining amount of the first data at a time of receiving a PLCP or a MAC header from the at least one neighboring device Step;

According to various embodiments, the signal packet may include transmission remaining amount information and destination information of the first data.

According to various embodiments, the neighboring device of the other party device that receives the signal packet may stop decreasing the backoff counter.

According to various embodiments, the backoff counter may be a backoff counter for transmitting data from a neighboring device of the counterpart device to the counterpart device.

According to various embodiments, the at least one neighboring device may determine whether the size of the third data is smaller than the size of the transmission remaining amount of the first data, including at least one size of a PLCP and a MAC header size have.

According to an embodiment of the present invention, a data communication apparatus based on asymmetric transmission time comprises: a communication interface for performing full-duplex communication; A memory for storing information received from at least one external device; And a processor connected to the communication interface and the memory, wherein the processor confirms completion of reception of second data received from the counterpart apparatus before the first data transmission to the counterpart apparatus is completed through the communication interface ; Stopping the transmission of the first data and transmitting a response packet based on the transmission remaining amount of the first data; And receiving third data of a size smaller than a transmission remaining amount of the first data from at least one neighboring device receiving the response packet.

According to various embodiments, the processor may begin transmitting a transmission remaining amount of the first data at a time of receiving a PLCP or MAC header from the at least one neighboring device.

According to various embodiments, the processor may include the transmission remaining amount information and the destination information of the first data in the signal packet.

According to various embodiments, the neighboring device of the other party device that receives the response packet may stop decreasing the backoff counter.

According to various embodiments, the backoff counter may be a backoff counter for transmitting data from a neighboring device of the counterpart device to the counterpart device.

According to various embodiments, the at least one neighboring device may determine whether the size of the third data is smaller than the size of the transmission remaining amount of the first data, including at least one size of a PLCP and a MAC header size have.

According to various embodiments of the present invention, in the bidirectional data transmission / reception between the devices, by not using the busy tone, it is possible to prevent the waste of the channel resources and improve the power efficiency to be consumed.

According to various embodiments of the present invention, in the bi-directional data transmission / reception between the devices, the communication efficiency of bidirectional communication can be improved by using the busy tone interval as the data transmission / reception interval.

1 illustrates a full duplex communication network in accordance with one embodiment of the present invention.
2 illustrates a network environment including a station and a station according to an embodiment of the present invention.
FIG. 3 illustrates a data transmission / reception structure for transmitting a busy tone in an asymmetric transmission time in a conventional full-duplex communication.
4 illustrates a data transmission / reception structure for transmitting / receiving data in asymmetric transmission time based on a response packet and a signal packet in full-duplex communication according to an embodiment of the present invention.
5 shows a schematic structure of a signal packet according to an embodiment of the present invention.
6 is a flowchart of a full duplex communication MAC protocol according to an embodiment of the present invention.
FIG. 7 shows a schematic network structure in a communication environment according to an embodiment of the present invention.
8 is a graph showing the throughput according to the maximum MPDU size in a network environment according to an embodiment of the present invention.
9 is a graph illustrating power consumption according to the maximum MPDU size in a network environment according to an embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, it is to be understood that the invention is not limited to the specific embodiments thereof, And equivalents and alternatives falling within the spirit and scope of the invention. In order to clearly illustrate the present invention in the drawings, parts not related to the description may be omitted, and the same reference numerals may be used for the same or similar components throughout the specification.

In various embodiments of the present invention, expressions such as 'or', 'at least one', etc. may denote one of the words listed together, or may represent a combination of two or more. For example, 'A or B', 'At least one of A and B' may include only one of A or B, and may include both A and B.

In various embodiments of the present invention, expressions such as 'first', 'second', 'first', 'second', etc. may describe various components, but they must mean the order, . For example, the first device and the second device are both devices and may represent different devices. Also, unless the elements of the configuration, function, operation, etc. of the first device are the same as or similar to the second device, the first device can be named as the second device, without departing from the scope of the various embodiments of the present invention, Similarly, the second device may also be termed the first device. Further, in the case where a specified operation (e.g., communication) is performed between the devices, the device and the counterpart (or relative) device can be represented.

In the various embodiments of the present invention, when an element is referred to as being "connected" or "connected" to another element, the elements may be directly connected or connected, It should be understood that there may be one and the same time. On the other hand, if an element is referred to as being 'directly connected' or 'directly connected' to another element, it should be understood that no other element exists between the elements.

The terms used in various embodiments of the present invention are intended to illustrate a specific embodiment and are not to be construed as limiting the invention, for example, the singular forms "a," "an, ≪ / RTI >

It is to be understood that the apparatus according to various embodiments of the present invention may be replaced by other apparatus of the same or similar type unless explicit limitations are described. Or a combination of one or more of the above. For example, the device may be provided as a structure that includes at least a portion of the devices described, or at least some of the functionality of the device.

1 illustrates a full duplex communication network in accordance with one embodiment of the present invention.

According to an embodiment of the present invention, a full duplex (or full duplex) network may comprise a network that transmits and receives data between one device and at least one other device. In the following description, each device for transmitting data is a device supporting full-duplex communication, and may be expressed as a station (station).

The station may be a telephone, a smartphone, a tablet personal computer, a mobile phone, a videophone, an e-book reader, a desktop personal computer, Such as a laptop personal computer (PC), a netbook computer, a personal digital assistant (PDA), a portable multimedia player (PMP), a camera, or a wearable device (HMD), or a smart watch), or may be a communication device such as a base station, an access point, or the like.

Referring to FIG. 1, at least two stations can exchange data with each other through full duplex communication. At this time, stations that transmit and receive data by full duplex communication to each other can be expressed as Station 1 and Station 2. Also, each of station 1 and station 2 may be connected to at least one neighbor station. In the following description, the station 101 can be represented by a station 1 (101), and the station 111 can be represented by a station 2 (111).

When station 1 101 and station 2 111 transmit and receive data in full duplex communication, station 103 and station 105 communicating with station 1 101 are connected to the neighbor station of station 1 101, The station 113 and the station 114 communicating with the second station 111 can decide to be the neighbor station of the station 2 111. [

The full-duplex communication MAC protocol for performing full-duplex communication can be classified into two types of centralized type full-duplex communication and distributed type full-duplex communication.

The centralized full duplex communication can control the full duplex communication schedule of all devices included in the network by a communication processing device such as an access point (AP). On the other hand, distributed full-duplex communication can handle data transmission and reception within a network through competition between devices. Thus, devices included in a distributed full duplex communication network may employ the CSMA / CA protocol.

In order to prevent data collision, each station in the distributed full-duplex communication network transmits data to the other station (for example, station 2 111) A busy tone (busy tone) can be transmitted until data transmission is completed.

According to various embodiments of the present invention, when the data transmission performed by one of the station 1 101 and the station 2 111 is in communication with each other first, the busy tone is not used and the remaining data Duplex communication MAC protocol for efficiently using the communication time up to transmission of the MAC protocol.

Referring to FIG. 2, at least one station transmitting and receiving data based on full-duplex communication and full-duplex communication can be described. FIG. 2 shows a network environment including a station (hereinafter referred to as a station 1 101) and a station 1 101 according to an embodiment of the present invention. The station 1 101 may include at least one of a bus 210, a processor 220, a memory 230, an input / output interface 240, and a communication interface 260, Information-based data communication can be performed.

The bus 210 may be a circuit that interconnects the components described above and communicates communication signals (e.g., control messages) between the components described above.

Processor 220 receives instructions from other components (e.g., memory 230, input / output interface 240, communication interface 260) described above via bus 210, It is possible to decode the instruction and execute the operation or data processing according to the decoded instruction.

Memory 230 may store instructions or data received from processor 220 or other components (e.g., input / output interface 240 or communication interface 260, etc.) or generated by processor 220 or other components Can be stored. Memory 230 may include, for example, a programming module such as a kernel, middleware, application programming interface (API) or application. Each of the above-described programming modules may be composed of software, firmware, hardware, or a combination of at least two of them.

The kernel may include system resources (e.g., bus 210, processor 220, or memory 230) used to execute operations or functions implemented in the rest of the programming modules, e.g., middleware, ) Can be controlled or managed. In addition, the kernel may provide an interface through which middleware, APIs, or applications can access and control or manage individual components of Station 1 101. [

The middleware can act as an intermediary for APIs or applications to communicate with the kernel and exchange data. In addition, the middleware may be associated with at least one application of the application, for example, with respect to work requests received from the application, such as system resources (e.g., bus 210, processor 220 or memory 230 (E.g., scheduling or load balancing) can be performed using a method such as assigning a priority that can be used for the job request.

An API is an interface for an application to control the functions provided in the kernel or middleware and includes at least one interface or function (e.g., command) for file control, window control, image processing, .

The application may be an application related to the exchange of information between an external device (e.g., station 2 111 and / or external stations 103 and 105) of station 1 101. Applications associated with information exchange may include, for example, a notification relay application for communicating specific information to an external station, or a device management application for managing an external station. According to various embodiments, an application may include applications further specified according to attributes (e.g., station type) of an external device (e.g., station 2 111 and / or external stations 103 and 105).

The input / output interface 240 is connected to the processor 220, the memory 230 (not shown) via the bus 210, or a command or data input from a user via a sensor (e.g., a gyro sensor) or an input device ), Or to the communication interface 260. For example, the input / output interface 240 may provide the processor 220 with data about the user's touch input through the touch screen. The input / output interface 240 may also be connected to an output device (e.g., a speaker or display) via a bus 210, for example, to receive commands or data received from the processor 220, the memory 230, ). ≪ / RTI > For example, the input / output interface 240 can output voice data processed through the processor 220 to a user through a speaker.

The communication interface 260 may connect communications between the station 1 101 and an external device such as a station 111 and / or a station 103, 105, or a server. For example, the communication interface 260 may be connected to the network 262 via wireless or wired communication to communicate with external devices.

Wireless communication may include, for example, wireless fidelity, Bluetooth, near field communication (NFC), global positioning system (GPS), orthogonal frequency division multiplexing (OFDM), orthogonal frequency division multiple access (OFDMA) (LTE), long term evolution-advanced (LTE), code division multiple access (CDMA), wideband code division multiple access (WCDMA), universal mobile telecommunications system (UMTS), WiBro or GSM mobile communications, and at least some of the above-described communication standards and communication schemes may be provided in cellular communication.

The wired communication may include at least one of, for example, a universal serial bus (USB), a high definition multimedia interface (HDMI), a recommended standard 232 (RS-232) or a plain old telephone service (POTS). The communication interface 260 may be included in one integrated chip (IC) or an IC package.

According to one embodiment of the present invention, the network 262 may be a telecommunications network. The communication network may include at least one of a computer network, an internet, an internet of things, or a telephone network. According to one embodiment, a protocol (e.g., a transport layer protocol, a data link layer protocol, or a physical layer protocol) for communication between the first station 101 and an external device may be applied to an application, an application programming interface, a middleware, ). ≪ / RTI >

In addition, station 1 101 may include at least one display (not shown). The display can display various information (e.g., multimedia data or text data) to the user. The display may also comprise a touch screen for inputting commands by touching or proximity touching the input means to the display.

Each of the above-described components of the station according to various embodiments of the present invention may be composed of one or more components, and the name of the component may be changed according to the type of the station. A station according to various embodiments of the present invention may be configured to include at least one of the above-described elements, and some of the elements may be omitted or further include other additional elements. In addition, some of the elements of the station according to various embodiments of the present invention may be combined to form an entity, so that the functions of the corresponding elements before being combined can be performed in the same manner.

At least one of the external devices according to various embodiments of the present invention, e.g., station 2 111, external station 103, 105, 113, 115 shown in FIG. 1, Or similar. It may also be configured to perform full duplex communication.

According to an embodiment of the present invention, in performing full duplex communication, the first station 101 may transmit a PLCP, a MAC header, and data to the second station 111. At this time, not only the station 2 111 but also at least one neighbor station of the station 1 101 can also receive the PLCP, MAC header transmitted by the station 1. The neighboring station receiving the PLCP and the MAC header transmitted from the first station 101 can confirm that the destination address included in the MAC header is different from the address of the neighboring station and at least one neighboring station not corresponding to the MAC address The decrease of the off counter can be stopped. In the following description, in describing stopping the reduction of the backoff counter, 'stop' may be expressed in terms of pause, freezing or freezing. Hereinafter, the operation of stopping the decrease of the backoff counter can be expressed as freezing the backoff counter.

When receiving the PLCP and the MAC header, the second station 111 may serve as a secondary transmitter. Therefore, the station 2 (111) can transmit PLCP, MAC header and data to the station 1 (101). At this time, as described above, at least one neighbor station of the station 2 111 can freeze the backoff counter by confirming that the channel of the station 2 111 is busy.

Thereafter, data is transmitted and received between the station 1 101 and the station 2 through full-duplex communication. In the case of a commonly used (or existing) full-duplex communication MAC protocol, the station 1 101, which has completed the transmission of data first, transmits busy tone and generates data during transmission of data between station 1 101 and station 2 111 The problem of the asymmetric transmission time can be solved. For example, FIG. 3 illustrates a data transmission / reception structure including busy tones in a general full-duplex communication.

3, when the station 1 (101) completes the transmission of the data 311 to be transmitted to the station 2 (111) before the reception of the data 313 transmitted by the station 2 (111) is completed, A busy tone 321 is sent to at least one neighboring station (e.g., the neighboring station 301) until it receives a response packet (ACK packet) 331 for the completion of the transmission of the data 313 from the second terminal 111 can do.

The neighboring station 301 receiving the busy tone 321 from the station 1 101 determines that the channel of the station 101 is in operation and can maintain the freezing of the backoff counter. The neighboring station 301 can resume the reduction of the backoff counter when confirming that the transmission and reception of data of the station 1 101 and the station 2 111 are all ended.

As described above, in the case of a general full-duplex communication MAC protocol, channel resources and power consumption may occur due to use of busy tone not including data. Therefore, it is necessary to provide a way to effectively utilize the busy tone interval 321 based on the asymmetric data transmission time.

According to an embodiment of the present invention, as shown in FIG. 4, it is possible to provide a full duplex communication MAC protocol based on an asymmetric transmission time, in which data is transmitted and received through full-duplex communication, without busy tone. FIG. 4 illustrates a data transmission / reception structure in full duplex communication according to an embodiment of the present invention.

First, during transmission and reception of data between station 1 101 and station 2 111, data transmission may be completed first in one device (e.g. station 1 101) as shown in Fig. 3 . For example, in the operation of the first station 101, transmission of the data 311 to the second station 111 may be completed before reception of the data 313 transmitted by the second station 111 is completed. At this time, the station 2 (111) can stop transmitting the data being transmitted and can transmit the response packet (415) to the station 1 (101). Here, the response packet 415 includes information related to data (transmission remaining amount or remaining data, 417) that has not yet been transmitted among the data 313 transmitted from the station 2 111, for example, The size (or size) of the data 413, the data 417 that has not been transmitted, and the information of the position where the transmission of data 313 is stopped.

Station 1 101 may send a flag packet 419 to at least one neighboring station when it receives reply packet 415. [ 5, the signal packet 419 may include size information of data 417 that has not yet been received among the data 313 received by the first station 101 from the second station 111. [ At this time, the neighbor station of the station 1 101 receiving the signal packet 419 can freeze the backoff counter until the reception of the data of the station 1 101 is completed. Here, the station 2 (111) that has completed the data reception can operate in the data reception waiting state by transmitting the response packet 431. [

At least one neighbor station (e.g., neighbor station 401) of station 2 111 can receive a response packet 415 sent by station 2 111 and based on the received response packet 415 Data transfer can be determined. For example, when there is data to be transmitted to the second station 111, the neighboring station 401 that receives the response packet 415 transmitted from the second station 111 transmits the information included in the response packet 415 It is possible to determine whether the size of the data 421 to be transmitted to the station 2 111 is smaller than the size of the data 417 whose transmission has not been started.

The neighboring station 401 of the second station 111 may compare the size of the data 417 to be transmitted with the size of the data 421 to be transmitted to the size of the data 421 to be transmitted, The size of at least one of the MAC header 425 and the MAC header 423 is smaller than the size of the data 417 that has not been transmitted.

If the neighboring station 401 determines that the size of the data 421 to be transmitted is smaller than the data 417 that has not been transmitted, the neighboring station 401 resumes the reduction of the backoff counter and performs transmission of the data 421 to be transmitted .

On the other hand, when the neighboring station 401 transmits the data 421 to be transmitted to the second station 111, the second station 111 transmits the remaining data 417 of the station 1 101 The response packet 431 can not be received. Accordingly, when the neighboring station 401 determines that the size of the data 421 to be transmitted is larger than the data 417 that has not been transmitted, it can decide not to transmit the data.

That is, the neighboring station 401 may freeze the backoff counter for the data transmission. Here, freezing the backoff counter in the neighboring station 401 may be to keep the state of the backoff counter decreasing from being stopped.

As described above, station 1 101 and station 2 111 can control the data transmission of neighboring stations without using a busy tone (e.g., busy tone 321 in FIG. 3) during full-duplex communication. , The communication performance of the network can be improved by controlling the data transmission from the other apparatus while data is being exchanged between the station 1 (101) and the station 2 (111).

According to one embodiment of the present invention, during the full-duplex communication of the station 1 (101) and the station 2 (111), the time when the neighbor stations of the station 2 111 fail to transmit data to the station 2 (111) T _{P_busy} ) is calculated based on the PLCP allocation time T _P , the MAC header allocation time T _M , the SIFS transmission time T _SIFS , the response packet allocation time T _ACK , the DIFS allocation time T _DIFS ), and the data allocation time (T _DS1 ) of the first station (101).

For example, the freezing time (T _{P_busy} ) of the station 2 (111) is _calculated by the following equations (1),

(1)

(One)

As shown in FIG.

At this time, the data allocation time of the second station 111 can be determined as T _DS2 , and the gain for the network performance of the full-duplex communication can be determined by the following equations (2) and

(2)

(2)

G < / RTI > Here, T _{T _busy} can be determined as the data allocation time of station 2 111 in the existing full-duplex communication (e.g., full duplex communication using busy tone as shown in FIG. 3)

(3)

(3)

As shown in FIG.

However, in applying the gain in the full-duplex communication according to various embodiments of the present invention, various embodiments may be applied without being determined based on the G-value based on the above-described equation (2). For example, the gain can be obtained when the data size of the neighbor station of the second station 111 is smaller than the G value.

Here, if the data size of the neighbor station of the station 2 (111) is not smaller than the G value, the network performance may deteriorate.

Referring to FIG. 4, it can be seen that the data transmission / reception time of the full-duplex communication according to various embodiments of the present invention is longer than the data transmission / reception time of the full-duplex communication using the busy tone shown in FIG. When the transmission of the data 311 of the first station 101 is completed (or when the second station 111 completes the reception of the data 311 transmitted from the first station 101) ( _TSIFS + communication time tack time) than the time used for data transmission / reception of existing full duplex communication using busy tone according to one embodiment, As shown in Fig.

5 shows a schematic structure of a signal packet according to an embodiment of the present invention.

The signal packet may be composed of data including at least one of frame control, duration, destination MAC address, DA, and frame check sequence (FCS) information.

Referring to FIG. 4, a neighboring station receiving a signal packet transmitted from the first station 101 may freeze the backoff counter based on time information. For example, the time information may include at least one of size information of data yet to be received, or time information for controlling at least one other device to prevent data transmission.

The destination information may include address information of an object to which the station 1 101 transmits a flag transmission. At least one station (and / or a neighbor station) receiving the signal packet may determine whether to perform control information included in the signal packet based on the destination information.

6 is a flowchart of a full duplex communication MAC protocol according to an embodiment of the present invention.

Referring to FIG. 6, ST ₁ and ST ₂ may represent Station 1 101 and Station 2 111, NS ₁ and NS ₂ may represent neighboring stations of Station 1 101 and Station 2 111, respectively. . DS ₁ and DS ₂ may represent the data size (or size) of station 1 101 and station 2 111. [ DS_NS ₁ and DS_NS ₂ may represent the data sizes of NS ₁ and NS _2, respectively.

Referring to step S601, according to an embodiment of the present invention, station 1 101 and station 2 111 can transmit and receive data through full-duplex communication. Here, the station 1 101 and the station 2 111 start transmission of data (e.g., the data 311 and the data 313 in FIG. 3) by transmitting the PLCP and the MAC header of the data to be transmitted to each other .

Referring to step S603, neighboring station 1 (101) neighboring station 2 (111) can confirm that the channels of station 1 (101) and station 2 (111) are all in a busy state, 101 and the neighboring stations of the station 2 111 can freeze the backoff counter.

Referring to step S605, it is possible to check whether or not the data transmission is completed in one station while the station-1 101 and the station-2 111 transmit and receive data to each other by full-duplex communication. For example, it can be confirmed whether or not the data transfer of the first station 101 is completed before the data transfer of the second station 111.

For example, referring to step S607, the receiving station 2 (111) which has received the transmission completed data in the station 1 (101) can stop transmitting data and transmit a response packet.

Referring to step S609, the first station 101 that receives the response packet transmitted from the second station 111 transmits a signal packet to the neighbor station of the station 101 that receives the signal packet, It is possible to control so that the counter is kept frozen continuously. Here, the signal packet may include size information of data 417 that has not yet been received among the data 313 received from the station 2 (111).

Referring to step S611, at least one neighbor station (e.g., a neighbor station of Station 2 (111), hereinafter referred to as a neighbor station 2) that receives a response packet transmitted from the station 2 (111) The data size of the neighboring station 2 is compared with the size of the transmission remaining data of the station 2 111 (for example, the data 417 of FIG. 4) It is possible to confirm whether or not it is smaller than the size of the remaining data.

If the neighbor station 2 confirms that the size of the data to be transmitted is relatively small, it may transmit the data to the station 2 111 as in step S613. At this time, the neighboring station 2 can start data transmission by resuming the reduction of the backoff counter for transmitting the data.

On the other hand, if the neighboring station 2 confirms that the size of the data to be transmitted is relatively large, it can decide not to transmit the data. According to one embodiment, as in step S615, the backoff counter for the data transmission may be frozen. Here, the freezing of the backoff counter in the neighboring station 2 may be to keep the state of the backoff counter decreasing being stopped.

In contrast, when it is determined in step S605 that the data transmission of the station 2 111 is completed before the data transmission of the station 1 101, the station 2 111 transmits data The receiving station 1 101 can stop the transmission of the data and transmit the response packet.

Referring to step S623, the station 2 (111) receiving the response packet transmitted from the station 1 (101) sends a signal packet to the neighbor station of the station 2 (111) It is possible to control so that the counter is kept frozen continuously. Here, the signal packet may include size information of data not yet received among the data received from the station 1 (101).

Referring to step S625, at least one neighboring station (e.g., a neighbor station of Station 1 101, hereinafter referred to as neighboring station 1) that receives a response packet transmitted from station 1 101 transmits the size The data size of the neighbor station 1 is compared with the size of the transmission residual data of the station 1 101 to determine whether or not the data size of the neighboring station 1 is smaller than the size of the transmission residual data of the station 1 101 have.

When it is confirmed that the size of the data to be transmitted is relatively small, the neighboring station 1 can transmit data to the station 1 101 as in step S627. At this time, the neighboring station 1 can start data transmission by resuming reduction of the backoff counter for transmitting data.

On the other hand, when the neighboring station 1 confirms that the size of the data to be transmitted is relatively large, it can decide not to transmit the data. According to one embodiment, as in step S629, the backoff counter for the data transmission may be frozen. Here, the freezing of the backoff counter in the neighboring station 1 may be to keep the state of the backoff counter decreasing from being stopped.

When performing step S613, step S615, step S627, or step S629, the first station 101 and the second station 111 transmit response packets to each other by completing the data transmission The embodiment of the present invention can be ended.

According to various embodiments, after performing step S613, if the data transmission of the neighboring station 2 is completed before the data transmission of the station 2, the method returns to step S607 without ending the embodiment of the present invention ).

Likewise, after performing step S627, if the data transmission of neighboring station 1 is completed before the data transmission of station 1, it may return to step S621 without terminating the embodiment of the present invention.

According to various embodiments of the present invention, a simulation for performance analysis of the above-described embodiments can be performed. FIG. 7 illustrates an approximate network topology in a communication environment in accordance with an embodiment of the present invention.

Referring to FIG. 7, dotted lines indicate states in which communication is possible for each station included in the network. The communication environment of the network adopts 802.11ac short-range wireless communication. In each simulation, the MPDU length can be set to 3895, 7991 and 11,454 bytes (byte), and the data to be transmitted from each station is randomly Can be generated. The size of the contention window can be set to [0, 1023], the initial backoff stage is assumed to be 3, and the remaining parameters (parameters) can be determined by the following table (1) have.

variable value Data rate 39 Mbps PLCP size (PLCP size) 40 μs MAC header size
(MAC header size) 36 bytes FCS size (FCS size) 4 bytes ACK size 14 bytes Flag size 14 bytes SIFS size (SIFS size) 16 μs DIFS size (DIFS size) 34 μs 1 slot size 9 μs Maximum MPDU size
(maximum MPDU size) 3895, 7991, 11454 bytes Simulation time 15 minutes Station's transmit power
(transmission power of station) 23 dBm (200 mW)

8 is a graph showing the throughput according to the maximum MPDU size in a network environment according to an embodiment of the present invention.

8, in a network environment according to an embodiment of the present invention, a full duplex communication (the proposed full duplex communication of FIG. 8), a non-busy communication (half duplex communication of FIG. 8) It is possible to compare full-duplex communications (conventional full-duplex communications in FIG. 8) using busy tones. According to one embodiment of the network environment, it may be a short range wireless communication environment of 802.11ac.

As shown in FIG. 8, the throughput of a full-duplex communication (e.g., conventional full-duplex and proposed full-duplex communication) networks represents a throughput that is higher (or greater) than the throughput of non-busy communication (e.g., half-duplex communication). Also, as the maximum MPDU size increases (eg, the maximum MPDU size of 7,955 and 11,418 bytes), the throughput of the proposed full-duplex communication is greater than the throughput of the traditional full-duplex communication. In other words, as the maximum MPDU size increases, the station can generate an asymmetric data increase. Therefore, a high communication performance gain can be achieved by performing full duplex communication based on the proposed full-duplex MAC protocol.

Referring to FIG. 8, when the maximum size of the MPDU is 3,859 bytes, the difference in size of data generated by each station is small, and the throughput of the existing full-duplex communication is higher than the throughput of the proposed full-duplex communication. That is, it can be shown that the gain obtained by using the proposed full-duplex MAC protocol decreases. Describing, if the maximum MPDU size is small, the overhead generated by transmitting a signal packet at each station may affect the performance of the proposed full-duplex communication.

9 is a graph illustrating power consumption according to the maximum MPDU size in a network environment according to an embodiment of the present invention.

9, in a network environment according to an embodiment of the present invention, full-duplex communication (the proposed full-duplex communication of FIG. 9), non-busy communication (half-duplex communication of FIG. 9) It is possible to compare the power consumption consumed in transmitting one kilobits (kbits) based on the full-duplex communication using the busy tone (full-duplex communication in Fig. 9). According to one embodiment of the network environment, it may be a short range wireless communication environment of 802.11ac.

Referring to FIG. 9, it can be seen that as the maximum MPDU size increases, the power consumption for transmitting a 1-bit bit decreases. This can be explained by the fact that the larger the maximum MPDU size, the lower the overhead such as the PLCP and / or MAC header.

In the three MAC protocols shown, the half-duplex communication protocol can be seen to consume minimal power. In other words, the CSMA / CA protocol is designed to be suitable for half-duplex communication, meaning that collisions can occur at the same power.

It can be confirmed that the existing full-duplex MAC protocol consumes the maximum power. The high power consumption in the existing MAC protocol can be attributed to the busy tone used to prevent the data transmission of the neighboring station. As described above, the busy tone does not include data, which means that power consumption is increased without data transmission / reception.

On the other hand, the proposed full - duplex MAC protocol can transmit and receive data without using busy tone during asymmetric transmission time. Thus, the proposed full-duplex MAC protocol consumes more power than the half-duplex communication protocol, but consumes less power than the existing full-duplex MAC protocol.

According to various embodiments, at least some of the devices and methods according to the various embodiments described in the claims of the present invention and / or the specification are in the form of hardware, software, firmware, or a combination of two or more of hardware, For example, modules, units). A module may be a minimum unit or a portion thereof that performs various embodiments of the present invention as a minimum unit or a part of an integrally constructed component. The module may be implemented mechanically or electronically. When implemented in software, a computer-readable storage medium (or computer-readable storage medium) for storing one or more programs (or programming modules, applications) may be provided. For example, the software may be embodied in instructions stored on a computer-readable storage medium in the form of a programming module. The one or more programs may include instructions to cause the device to perform the methods according to the embodiments of the invention and / or the claims of the present invention. The instructions, when executed by one or more processors (e.g., the processor 220), may cause the one or more processors to perform functions corresponding to the instructions. The computer readable storage medium may be, for example, the memory 230). At least some of the programming modules may be implemented (e.g., executed) by, for example, the processor 220. At least some of the programming modules may include, for example, modules, programs, routines, sets of instructions or processes, etc. to perform one or more functions.

The computer-readable recording medium includes a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, an optical recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD (Digital Versatile Disc) A magneto-optical medium such as a floppy disk and a program command such as a ROM (Read Only Memory), a RAM (Random Access Memory), a flash memory, (EEPROM), a magnetic disc storage device or other type of optical storage device, or any other form of optical storage device, A magnetic cassette may be included. Or a combination of some or all of these. In addition, a plurality of constituent memories may be included.

In addition, the device may be accessed via a communication network comprised of a communication network such as the Internet, an Intranet, a Local Area Network (LAN), a Wide Area Network (WLAN), or a Storage Area Network (SAN) and can be stored in an attachable storage device that can access the storage device. Such a storage device may be connected to the device via an external port. Also, a separate storage device on the communication network may be connected to the portable device. The hardware devices described above may be configured to operate as one or more software modules to perform operations for various embodiments of the present invention, and vice versa.

Modules or programming modules according to various embodiments of the present invention may include at least one or more of the elements described above, some of which may be omitted, or may further include other additional elements. Operations performed by modules, programming modules, or other components in accordance with various embodiments of the invention may be performed in a sequential, parallel, iterative, or heuristic manner. Also, some operations may be performed in a different order, omitted, or other operations may be added.

The embodiments of the present invention disclosed in the present specification and drawings are merely illustrative examples of the present invention and are not intended to limit the scope of the present invention in order to facilitate understanding of the present invention. Accordingly, the scope of the present invention should be construed as being included in the scope of the present invention, all changes or modifications derived from the technical idea of the present invention.

101 and 111: stations 103, 105, 113 and 115: neighboring stations
210: bus 220: processor
230: memory 240: input / output interface
260: Communication interface

Claims (12)

CLAIMS What is claimed is: 1. A method of communicating data based on an asymmetric transmission time of a full-
Confirming completion of reception of second data received from the counterpart apparatus before completion of transmission of the first data to the counterpart apparatus;
Stopping the transmission of the first data and transmitting a response packet based on the transmission remaining amount of the first data; And
And receiving third data of a size smaller than a transmission remaining amount of the first data from at least one neighboring device that receives the response packet.
The method according to claim 1,
And initiating transmission of the transmission remaining amount of the first data at the time of receiving the PLCP or MAC header from the at least one neighboring device.
The method according to claim 1,
Wherein the signal packet includes transmission remaining amount information and destination information of the first data.
The method according to claim 1,
Wherein the neighboring device of the other party device that receives the signal packet stops decreasing the backoff counter.
5. The method of claim 4,
Wherein the backoff counter is a backoff counter for transmitting data from a neighboring device of the counterpart device to the counterpart device.
The method according to claim 1,
Wherein the at least one neighboring device is based on an asymmetric transmission time that determines whether the size of the third data is smaller than a size of a transmission remaining amount of the first data including at least one size of a PLCP and a MAC header size Lt; / RTI >
A communication interface for performing full-duplex communication;
A memory for storing information received from at least one external device; And
And a processor coupled to the communication interface and the memory,
The processor comprising:
Confirming completion of reception of second data received from the partner apparatus before the first data transmission to the partner apparatus is completed through the communication interface;
Stopping the transmission of the first data and transmitting a response packet based on the transmission remaining amount of the first data; And
And receiving third data of a size smaller than a transmission remaining amount of the first data from at least one neighboring device receiving the response packet.
8. The method of claim 7,
Wherein the processor starts transmitting the remaining amount of transmission of the first data at the time of receiving the PLCP or MAC header from the at least one neighboring device.
8. The method of claim 7,
Wherein the processor includes in the signal packet the transmission remaining amount information and the destination information of the first data.
8. The method of claim 7,
Wherein the neighboring device of the other party device that receives the response packet stops decreasing the backoff counter.
11. The method of claim 10,
Wherein the backoff counter is a backoff counter for transmitting data from a neighboring device of the counterpart device to the counterpart device.
8. The method of claim 7,
Wherein the at least one neighboring device is based on an asymmetric transmission time that determines whether the size of the third data is smaller than a size of a transmission remaining amount of the first data including at least one size of a PLCP and a MAC header size Lt; / RTI >

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