KR101627577B1 - Communication system using frequency mirroring - Google Patents

Communication system using frequency mirroring Download PDF

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Publication number
KR101627577B1
KR101627577B1 KR1020150059222A KR20150059222A KR101627577B1 KR 101627577 B1 KR101627577 B1 KR 101627577B1 KR 1020150059222 A KR1020150059222 A KR 1020150059222A KR 20150059222 A KR20150059222 A KR 20150059222A KR 101627577 B1 KR101627577 B1 KR 101627577B1
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KR
South Korea
Prior art keywords
frequency
data
data modulated
transmission
modulated
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KR1020150059222A
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Korean (ko)
Inventor
임재성
백호기
고상순
전민환
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아주대학교산학협력단
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Priority to KR1020150059222A priority Critical patent/KR101627577B1/en
Priority to PCT/KR2016/004381 priority patent/WO2016175547A1/en
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Publication of KR101627577B1 publication Critical patent/KR101627577B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18515—Transmission equipment in satellites or space-based relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18519—Operations control, administration or maintenance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/212—Time-division multiple access [TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/16—Frequency regulation arrangements

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

The present invention relates to a communication system for efficiently transmitting data in a distributed network environment. A relay apparatus according to an embodiment of the present invention includes a receiver for receiving data modulated at a first frequency transmitted by a transmitting apparatus during a first time interval, a modulator for modulating the modulated data at the first frequency to a second frequency And a receiver for transmitting the data modulated at the second frequency to a receiver, wherein the data modulated at the second frequency is received at the receiver during a second time interval, And the second time interval is included in the same frame interval, the second time interval includes a first time delay according to transmission from the transmission apparatus to the relay apparatus from the first time interval, Lt; RTI ID = 0.0 > 2 < / RTI >

Description

[0001] COMMUNICATION SYSTEM USING FREQUENCY MIRRORING [0002]

The following embodiments relate to a communication system, and more particularly, to a communication system that efficiently transmits data in a distributed network environment.

The present invention was derived from research carried out as part of a project for supporting researchers of the future by the Creation Science Department and the Korea Research Foundation [assignment number: S-2015-A0403-00016, title: Positioning using aerospace node communication relay / Telecommunications Convergence Technology].

Military and emergency communications networks are designed with survivability as their top priority. For example, it is very important to operate communication networks that are not attacked even if a part of the communication network is physically attacked.

Most wireless networks use a centralized relay. When a centralized relay device receives a physical attack, it is general that the remaining terminals can not communicate with each other. Thus, a wireless network using a centralized repeater is not suitable for use in military or emergency communications.

In order to overcome this disadvantage, a network using multi-hop communication is considered. A network using multi-hop communication is a communication system for exchanging data using multi-hop communication via terminals without a centralized relay apparatus. Military communication systems often require connections between different networks. In many cases, multi-hop communication networks are difficult to smoothly connect heterogeneous networks.

United States Patent No. 8,078,162 entitled " AIRBORNE WIRELESS COMMUNICATION SYSTEMS, AIRBORNE COMMUNICATION METHODS, AND COMMUNICATION METHODS "has been proposed as a type of network protocol for implementing multi-hop communication in an emergency situation such as display and disaster occurrence. The prior art is a technique for improving the coverage of a disaster area by using a directional beam and a directional antenna. A relay station mounted on an aircraft has been proposed to increase coverage for a disaster area while circulating around the disaster area.

However, even in the prior art, in a multi-hop network in an emergency situation, a plurality of time frames must be consumed in order to determine which nodes are available nodes. In addition, There is still a problem of consuming a lot of time resources in the process of detecting collisions and coping with collisions.

United States Patent No. 8,078,162 (registered on December 13, 2011)

The following embodiments are intended to transmit a two-hop distance transmission apparatus and reception apparatuses within one frame.

The following embodiments are intended to significantly improve the efficiency of a radio band since complex control information for preventing collision of data is not transmitted.

In the following embodiments, when an attempt for resource allocation causes a collision, it is possible to quickly perform the detection and the corresponding process, and to minimize the penalty caused by the collision. The object of the present invention is to improve the efficiency of the communication network because it is possible to confirm whether or not a collision is caused in a time frame with respect to all nodes within a two-hop range when allocating resources.

According to an exemplary embodiment of the present invention, there is provided an apparatus for transmitting data, the apparatus comprising: a receiver for receiving data modulated at a first frequency, the data being transmitted during a first time interval; And a transmitter for transmitting the data modulated at the second frequency to a receiver, wherein the data modulated at the second frequency is received at the receiver during a second time interval, and wherein the first time interval and the second Wherein the time interval is included in the same frame period and the second time interval includes a first time delay according to the transmission from the transmission apparatus to the relay apparatus from the first time interval and a second time delay from the relay apparatus to the reception apparatus Delayed by a second time delay according to the second time delay.

Here, the transmitted data modulated at the second frequency may be received at the transmitting apparatus within the frame period with an acknowledgment message (ACK) for the data modulated at the first frequency.

The data transmitted at the second frequency is received at the transmission apparatus, and the distance from the relay apparatus to the transmission apparatus is determined by the time at which the transmission apparatus transmits the data modulated at the first frequency, Is estimated based on the time when the data modulated with the second frequency is received.

The data modulated at the second frequency may be received at the transmitting apparatus and may be transmitted at a time when the transmitting apparatus transmits the data modulated at the first frequency and at a time when the transmitting apparatus transmits the data modulated at the second frequency The transmission power of the second data to be transmitted by modulating the transmission apparatus to the first frequency may be controlled based on the received time point.

According to yet another exemplary embodiment, there is provided an apparatus comprising: a modulator for modulating data to a first frequency; And a transmitter for transmitting the data modulated at the first frequency to the repeater during a first time interval, wherein the data modulated at the first frequency is modulated to a second frequency at the repeater, Wherein the modulated data is received at a receiving device during a second time interval, wherein the first time interval and the second time interval are included in the same frame interval, and the second time interval is transmitted from the transmission device A transmission apparatus delayed by a first time delay according to transmission to the relay apparatus and a second time delay according to transmission from the relay apparatus to the reception apparatus may be provided.

The receiving apparatus may further include a receiving unit that receives the data modulated at the second frequency from the relay apparatus in the frame period using an acknowledgment message (ACK) for the data modulated at the first frequency.

The receiving apparatus includes a receiver for receiving the data modulated at the second frequency from the relay apparatus, and a receiver for receiving data modulated at the first frequency and at a time of receiving data modulated at the second frequency, And a distance estimator for estimating a distance from the relay apparatus to the relay apparatus.

The transmitting apparatus may further include a receiving unit that receives data modulated at the second frequency from the relay apparatus, wherein the transmitting unit receives the data modulated at the first frequency and the receiving unit that receives the data modulated at the second frequency The transmission power of the second data to be modulated with the first frequency may be controlled based on the time point.

According to yet another exemplary embodiment, there is provided a method comprising: receiving data modulated at a first frequency transmitted by a transmitting device during a first time interval; modulating the modulated data at a first frequency to a second frequency And transmitting data modulated at the second frequency to a receiving device, wherein the data modulated at the second frequency is received at the receiving device during a second time interval, and wherein the first time interval and the second Wherein the time interval is included in the same frame period and the second time interval includes a first time delay according to the transmission from the transmission apparatus to the relay apparatus from the first time interval and a second time delay from the relay apparatus to the reception apparatus Is delayed by a second time delay corresponding to the first time delay.

Here, the transmitted data modulated at the second frequency may be received at the transmitting apparatus within the frame period with an acknowledgment message (ACK) for the data modulated at the first frequency.

The data transmitted at the second frequency is received at the transmission apparatus, and the distance from the relay apparatus to the transmission apparatus is determined by the time at which the transmission apparatus transmits the data modulated at the first frequency, May be estimated based on a time point at which data modulated at the second frequency is received.

The data modulated at the second frequency may be received at the transmitting apparatus and may be transmitted at a time when the transmitting apparatus transmits the data modulated at the first frequency and at a time when the transmitting apparatus transmits the data modulated at the second frequency The transmission power of the second data to be transmitted by modulating the transmission apparatus to the first frequency may be controlled based on the received time point.

According to another exemplary embodiment, there is provided a method comprising modulating data at a first frequency and transmitting data modulated at the first frequency to a relay device during a first time interval, Data is modulated to a second frequency in the relay apparatus, data modulated at the second frequency is received at a receiving apparatus during a second time period, and the first time period and the second time period are included in the same frame period Wherein the second time interval is a transmission delayed from the first time interval by a first time delay according to transmission from the transmission apparatus to the relay apparatus and a second time delay according to transmission from the relay apparatus to the reception apparatus, A method of operating a device is provided.

The method may further include receiving data modulated at the second frequency from the relay apparatus in the frame period using an acknowledgment message (ACK) for the data modulated at the first frequency.

Receiving the data modulated at the second frequency from the relay apparatus; and transmitting the data modulated at the first frequency to the transmitting apparatus at a time when the transmitting apparatus transmits the data modulated at the first frequency, And estimating a distance from the transmission apparatus to the relay apparatus based on a point in time.

The method of claim 1, further comprising: receiving data modulated at the second frequency from the relay device; and receiving data modulated at the second frequency based on a time point at which the data modulated at the first frequency is transmitted, And controlling the transmission power of the second data to be modulated in frequency and transmitted.

According to the following embodiments, a transmission apparatus and a reception apparatus of two-hop distance can be transmitted within one frame.

According to the following embodiments, complex control information for preventing collision of data is not transmitted, and the efficiency of the wireless band can be greatly improved.

According to the following embodiments, when an attempt to allocate a resource causes a collision, the detection and the corresponding process can be performed quickly, and the penalty due to the collision can be minimized. In addition, since the conflict can be confirmed within one time frame for all the nodes within the two-hop range when allocating resources, the efficiency of the communication network can be greatly improved.

1 is a diagram schematically illustrating a communication system according to an exemplary embodiment.
2 is a diagram illustrating a concept of transmitting data using frequency mirroring according to an exemplary embodiment.
3 is a diagram illustrating a case where a communication method according to an exemplary embodiment is applied to a TDMA.
4 is a diagram illustrating a concept of estimating a distance to a relay apparatus using a communication method according to an exemplary embodiment.
5 is a diagram illustrating a case where the communication method according to the exemplary embodiment is applied to CSMA.
6 is a diagram illustrating a case where a communication method according to an exemplary embodiment is applied to OFDMA.
7 is a block diagram illustrating the structure of a transmission apparatus according to an exemplary embodiment.
8 is a block diagram illustrating the structure of a transmission apparatus according to another exemplary embodiment.
9 is a block diagram showing the structure of a relay apparatus according to an exemplary embodiment.
FIG. 10 is a flowchart illustrating steps of a transmission method according to an exemplary embodiment.
11 is a flowchart illustrating a stepwise transmission method according to another exemplary embodiment.
12 is a flowchart illustrating a stepwise transmission method according to another exemplary embodiment.
13 is a flowchart illustrating steps of a relaying method according to an exemplary embodiment.
14 is a diagram illustrating operation of a communication network system under a topology according to an exemplary embodiment.
15 is a diagram illustrating operation of a communication network system under a topology according to another exemplary embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the following description of the embodiments of the present invention, specific values are only examples.

1 is a diagram schematically illustrating a communication system according to an exemplary embodiment.

The communication system according to the exemplary embodiment includes a transmission apparatus 120, a relay apparatus 110, and a reception apparatus 130. [

In FIG. 1, the transmission apparatus 120 may be included in the first sub-communication system, and the reception apparatus 130 may be included in the second sub-communication system. In this case, the first subcommunication system and the second subcommunication system may be communication systems different from each other.

The transmission apparatus 120 modulates the data to a first frequency and transmits the modulated data to the relay apparatus 110 at a first frequency.

The relay apparatus 110 receives the data modulated at the first frequency. The relay apparatus 110 may modulate the data modulated at the first frequency to a second frequency. According to one aspect, the relay apparatus 110 can directly modulate the first frequency to the second frequency without demodulating the data modulated at the first frequency into the baseband and then modulating the data to the second frequency band again . In the case of direct modulation, the baseband processing can be omitted, and the relay apparatus 110 can be reduced in size and weight because only components for processing the RF band such as the first frequency and the second frequency are mounted. Accordingly, the relay apparatus 110 can be installed on a high tower, easily mounted on a satellite, or installed in the air using a balloon, an airship, a drone or the like.

When the relay apparatus 110 directly modulates the data modulated at the first frequency to the second frequency, the time delay required for modulation can be neglected with an extremely small value. The relay apparatus 110 does not perform any processing on the data and therefore the content of the data modulated at the first frequency received by the relay apparatus 110 and the content of the data modulated at the second frequency transmitted by the relay apparatus 110 Are the same.

The relay apparatus 110 receives the data modulated at the second frequency by the receiving apparatus 130.

According to the embodiment shown in FIG. 1, the relay apparatus 110 does not demodulate data or insert additional data in the data modulated at the first frequency, but merely changes the frequency to the second frequency, Lt; / RTI > In this case, the relay apparatus 110 can be downsized and lightweight, and a communication network can be constructed by various methods.

In addition, the transmission apparatus 120 and the reception apparatus 130 can transmit data within one frame period, and the transmission apparatus 120 can receive an ACK for data in the frame in which the data is transmitted.

In addition, the transmission apparatus 120, the relay apparatus 110, and the reception apparatus 130 can transmit data by minimizing the time, cost, and the like for allocating radio resources or transmitting control information related to allocation of radio resources.

The present invention can be applied to an environment in which a transmission time of a data packet transmitted from the transmission apparatus 120 and the relay apparatus 110 is longer than a propagation time, The uplink transmission and the downlink transmission of the relay apparatus 110 can be performed together in one time frame. In addition, the transmitting apparatus 120 unicasts the data packet to the relay apparatus 110 using the first frequency, and the relay apparatus 110 transmits the data packet to the plurality of receiving apparatuses 130 ) And the transmission device 120, but the spirit of the present invention is not limited to such an embodiment.

2 is a diagram illustrating a concept of transmitting data using frequency mirroring according to an exemplary embodiment.

The transmission device 210, the relay device 220, and the reception device 230 operate on a frame basis as a time unit. The frame period may be defined as a time period 242, 273 located between the frame start time 240, 271 and the frame end time 241, 272.

The transmitting apparatus 210 transmits the first data 261 modulated at the first frequency during the first time period 251 in the first frame period 242. [ The first data 261 modulated at the transmitted first frequency reaches the repeater 220 after the first time delay 252 in accordance with the transmission from the transmission apparatus 210 to the repeater.

The relay apparatus 220 receives the first data 262 modulated at the first frequency after the first time delay 252. [ The relay device 220 modulates the first data 262 modulated at the first frequency to a second frequency. The time delay required for modulation from the first frequency to the second frequency can be neglected with an extremely small value.

The relay device 220 transmits the first data modulated at the second frequency to the receiving device 230. The first data modulated at the second frequency reaches the receiving device 230 after the second time delay 253 in accordance with the transmission from the relay device 220 to the receiving device 253.

The receiving device 230 receives the first data 263 modulated at the second frequency during the second time interval. The second time interval is included in the same frame interval 241 as the first time interval 251 and is delayed from the first time interval 251 by the first time delay 252 and the second time delay 253 Time interval. The receiving apparatus 230 can demodulate the first data modulated at the second frequency to the baseband, and decode the demodulated data to grasp the contents of the data.

2, the relay apparatus 220 receives the first data modulated at the first frequency and immediately transmits the first data modulated at the second frequency to the receiving apparatus 230 without a time delay do. Therefore, time delay due to relaying can be minimized. The first data transmitted by the transmission apparatus 210 is transmitted to the reception apparatus 230 via the relay apparatus 220 in one frame period 242. Thus, in a communication system that transmits data in a multi-hop manner, data can be transmitted to a communication node located at a two-hop distance within one frame period 242. This allows communication between communication nodes located two-hop distances to be handled in a substantially one-hop communication, and enables rapid communication. In the event that the object of the present invention is to efficiently operate a distributed network in an environment where central control communication such as occurrence of a disaster or a display situation is not easy, communication nodes within a two- It is an extremely important effect of the present invention.

The present invention can solve the hidden terminal problem because the communication nodes within the two-hop distance are operated as one-hop and the channel occupancy collision by the hidden terminal within the two-hop range can be detected within the corresponding time frame. Also, communication between the communication nodes within a two-hop distance around the relay apparatus 220 can be performed in the same manner as a communication node within a single hop without guaranteeing the LOS (Line of Sight).

The first data modulated at the second frequency transmitted by the relay apparatus 220 may be transmitted not only to the reception apparatus 230 but also to the transmission apparatus 210. The transmission apparatus 210 receives the first data 264 modulated at the second frequency, demodulates the first data modulated at the received second frequency to the baseband, decodes the demodulated first data, .

According to one aspect, the transmitting apparatus 210 may compare the contents of the received first data 264 with the contents of the first data 261 transmitted by the transmitting apparatus 210. If the contents of the received first data 264 are the same as the contents of the first data 261 transmitted by the transmission apparatus 210, the transmission apparatus 210 transmits the first data 261 modulated at the first frequency, Can be determined to have been successfully transmitted to the relay apparatus 220. That is, the transmitting apparatus 210 may receive the first data 264 modulated at the second frequency with an acknowledgment message (ACK) for the first data 261 modulated at the first frequency.

According to one aspect, the transmitting apparatus 210 may transmit the second data modulated at the first frequency to the relay apparatus 220 during the first time period 274 in the second frame period 273. The receiving apparatus 230 may also transmit the third data 275 modulated at the first frequency to the repeater 220 during the first time interval 275 in the second frame interval 273.

The relay apparatus 220 may receive the second data 276 modulated at the first frequency after the time delay 276 in accordance with the transmission from the transmission apparatus 210 to the relay apparatus 220. [ The relay device 220 may also receive the third data 277 modulated at the first frequency after a time delay 277 in accordance with the transmission from the receiving device 230 to the relay device 220.

The relay apparatus 220 receives both the second data 276 modulated at the first frequency and the third data 277 modulated at the first frequency and modulates them to the second frequency. The relay device 220 transmits both the second data modulated at the second frequency and the third data modulated at the second frequency.

The transmitting apparatus 210 receives both the second data 281 modulated at the second frequency and the third data 282 modulated at the second frequency. The transmitting apparatus converts both the second data 281 modulated at the second frequency and the third data 282 modulated at the second frequency into the baseband. However, since both the second data and the third data are included, the transmission apparatus 210 can not decode the second data. In this case, the transmission apparatus 210 can be determined that the second data 274 modulated at the first frequency has not been successfully transmitted to the relay apparatus 220.

In addition, the receiving device 230 may also receive both the second data 283 modulated at the second frequency and the third data 284 modulated at the second frequency. The receiving apparatus 230 may also be determined that the third data 275 modulated at the first frequency has not been successfully transmitted to the relay apparatus 220. [

Since both the transmitting apparatus 210 and the receiving apparatus 230 can receive the self-transmitted data in the frame, whether or not the uplink signal has been successfully transmitted to the relay apparatus 220 without collision is indicated in the frame Can be confirmed. Thus, the transmitting device 210 and the receiving device 230 can determine whether to retransmit automatically in the next frame, or to select another frequency band.

When the plurality of devices 210 and 230 transmit data using the same frame period 273 as shown in FIG. 2, the devices 210 and 230 are also connected to other devices 210 and 230 Data is transmitted to the same frame period 273, and it can be determined that the data transmission has failed.

That is, each of the devices 210 and 230 can determine whether or not the data transmission is successful without additionally transmitting an acknowledgment message (ACK) or a reception failure message (NACK).

According to the embodiment shown in Fig. 2, it is not necessary to transmit additional control signals in order to allocate a specific frame period to a specific device. If the devices 210 and 230 fail to transmit data and retransmit the corresponding data according to a predetermined rule, the devices 210 and 230 may transmit the data to the devices 210 and 230 without transmitting control signals Data can be transmitted.

In addition, the embodiments described in Figures 1 and 2 may be used in combination with other multiple access schemes (TDMA, CSMA, OFDMA). Embodiments in which the embodiments described in Figs. 1 and 2 are used in combination with TDMA, CSMA, OFDMA, etc. will be described in Figs. 3 to 6 below.

3 is a diagram illustrating a case where a communication method according to an exemplary embodiment is applied to a TDMA.

The frame 310 illustrated in FIG. 3 is a time frame used in a Uniform Slot Assignment Protocol-Multiple Access (USAP-MA) communication method, which is a type of TDMA communication method. In the USAP-MA communication method, each frame 310 includes a Bootstrap Slot 311, a Broadcast Slot 312, and a Reservation / Standby Slot 313.

Here, the bootstrap slot 311 is used to indicate to which device the broadcast slot 312 and the reserved / standby slot 313 are allocated. In addition, the broadcast slot 312 is used to provide a datagram service, or is used to transmit other control information. The reservation / waiting slot 313 is used for transmitting data between the transmitting apparatus and the receiving apparatus. That is, in the entire frame 310, only the reserved / standby slot 313 is used for transmitting data between the transmitting apparatus and the receiving apparatus, and other parts are used for transmitting control information for the allocation of the radio resources .

When the embodiment is applied to the TDMA communication method in FIGS. 1 and 2, it is not necessary to transmit control information for allocation of radio resources. Therefore, data can be transmitted using the frame 350 of the new format composed only of reservation / waiting slots.

When using the new formatted frame 350, it is not necessary to transmit control information for the allocation of radio resources, so that most of the frame 350 can only be used for data transmission, and as a result, the efficiency of radio resources can be greatly improved .

4 is a diagram illustrating a concept of estimating a distance to a relay apparatus using a communication method according to an exemplary embodiment.

4 (a) is a diagram showing that the transmitting apparatus transmits data to the relay apparatus and receives data from the relay apparatus again.

According to one aspect, the transmitting apparatus 410 transmits the data modulated at the first frequency to the relay apparatus 420, and receives the data modulated at the second frequency from the relay apparatus 420.

4B is a diagram showing data 430 transmitted by the transmission apparatus 410 and data 440 received by the transmission apparatus 410. FIG. In Fig. 4 (b), the time at which the relay apparatus modulates from the first frequency to the second frequency is an extremely short time that can be ignored. Therefore, the difference in time at which the transmitting apparatus 410 receives data from the time when the transmitting apparatus 410 transmits data is affected only by the transmission delay.

The transmission apparatus 410 can estimate the distance from the transmission apparatus 410 to the relay apparatus 420 based on the difference in the time when the transmission apparatus 410 received the data from the time when the transmission apparatus 410 transmitted the data have.

5 is a diagram illustrating a case where the communication method according to the exemplary embodiment is applied to CSMA.

Carrier sense multiple access (CSMA) is a multiple access method in which a carrier is detected to determine whether another device is using the corresponding time frame. If another device is using the time frame, it tries to transmit again in another time frame. If another device does not use the corresponding time frame, it transmits data. If the transmitted data collides with other data, it waits for a certain time and retransmits the data.

In order to use the CSMA scheme, the transmission device transmits a control signal called RTS (Ready to Send) to other devices in the network. In addition, when the corresponding time frame is available, a control signal called CTS (Clear to Send) is received.

When the embodiment described with reference to Figs. 1 and 2 is applied to the CSMA scheme, the transmission apparatus can transmit data without transmitting / receiving control signals such as RTS and CTS. 5, the transmission apparatus 510 transmits the data 560 modulated at the first frequency after the start time 541 of the time frame 543 and after the DIFS (Distributed Inter-Frame Space) 545, (520). The relay apparatus 520 receives the data 561 that has reached the time delay.

The relay apparatus 520 modulates the data 561 modulated at the first frequency to a second frequency. The relay apparatus 520 transmits the data 562 modulated at the second frequency to the receiving apparatus 530. Receiving device 530 receives data 563 that has arrived at a time delay.

The transmitting apparatus 510 receives the data 564 modulated at the second frequency with an acknowledgment message (ACK) for the modulated data 560 at the first frequency.

The transmission apparatus 510 waits for a time corresponding to the DIFS 573 after the reception of the data is completed. Thereafter, a contention window 574 continues until the end time 542 of the time frame 542

According to the embodiment shown in FIG. 5, the transmission apparatus 510 can transmit data without determining whether the corresponding time frame 543 is reserved for another apparatus. If the data collide, the transmitting apparatus 510 can determine the data itself and retransmit the data.

Therefore, the transmitting apparatus 510 does not need to transmit unnecessary control information (RTS, CTS), so that most of the time frame 543 can be used only for data transmission, and as a result, the efficiency of radio resources can be greatly improved. The two-hop transmission from the transmission apparatus 510 to the relay apparatus 520 and from the relay apparatus 520 to the reception apparatus 530 can be performed within one time frame 543. [

6 is a diagram illustrating a case where a communication method according to an exemplary embodiment is applied to OFDMA.

The first frame shown at the top of FIG. 6 shows a frame structure applied to general OFDMA. The first frame includes two OFDM symbols 621 and 622. The first OFDM symbol 621 continues from the start point 611 of the frame to the intermediate point 612 of the frame and the second OFDM symbol 622 continues from the end point 612 of the frame to the end point 613 of the frame. .

Each OFDM symbol 621, 622 includes cyclic prefixes 631, 632. The cyclic prefixes 631 and 632 are used to compensate for inter-symbol interference caused by multipath fading. In a typical OFDMA scheme, a considerable number of time intervals are allocated to compensate for interference between symbols, and a cyclic prefix is transmitted.

The second frame shown at the bottom of FIG. 6 shows that the embodiment described in FIG. 4 is applied to OFDMA. Referring to FIG. 4, the transmission apparatus can estimate the distance to the relay apparatus.

The transmission apparatus can adjust the time synchronization in consideration of the distance to the relay apparatus. In this case, interference between symbols due to multipath fading can be reduced. Thus, the transmission apparatus can sufficiently compensate for interference between symbols with only a smaller amount of cyclic prefix. The second frame shown at the bottom of FIG. 6 includes two OFDM symbols 641 and 642. Each OFDM symbol 641, 642 may contain only a small amount of cyclic prefixes 651, 652 as compared to OFDM symbols 621, 622.

7 is a block diagram illustrating the structure of a transmission apparatus according to an exemplary embodiment.

The transmitting apparatus 700 according to the exemplary embodiment includes a modulating unit 710, a transmitting unit 720, and a receiving unit 730.

The modulation unit 710 modulates the data to the first frequency.

The transmission unit 720 transmits the data modulated at the first frequency to the relay apparatus 740. According to one aspect, the transmitting unit 720 may transmit the data modulated at the first frequency to the repeater 740 during a first time period included in the frame period.

The data modulated at the first frequency is modulated at the second frequency in the repeater 740. Here, the time for modulating from the first frequency to the second frequency is an extremely short time that can be neglected.

The relay apparatus 740 can directly modulate the first frequency to the second frequency without demodulating the data modulated at the first frequency to the baseband. Since the relay apparatus 740 carries only components for processing of the RF band such as the first frequency and the second frequency, the relay apparatus 740 can be reduced in size and weight.

The data modulated at the second frequency is transmitted from the relay apparatus 740 to the receiving apparatus 750. Receiver 750 receives the data modulated at the second frequency and demodulates it to baseband. The receiving apparatus 750 can decode the baseband demodulated data and grasp the contents thereof.

According to one aspect, the receiver 730 can receive data modulated at the second frequency. The receiver 730 can demodulate the data modulated at the second frequency to the baseband, and decode the demodulated data to grasp the contents.

According to one aspect, the receiver 730 may compare the contents of the demodulated data with the contents of the data modulated at the first frequency. If the content of the decoded data is the same as the content of the data modulated at the first frequency, the receiver 730 can determine that the data modulated at the first frequency has been successfully transmitted to the repeater 740. That is, the receiver 730 may receive the data modulated at the second frequency using an acknowledgment message (ACK) for the data modulated at the first frequency.

According to one aspect, the transmission apparatus 700 can operate with a frame period as a time unit. In this case, the transmitting unit 720 may transmit the data modulated at the first frequency during the first time period occupying a part of the frame period. The data modulated at the first frequency is received at the repeater 740 after a time delay due to transmission to the repeater 740. [

As previously assumed, the modulation from the first frequency to the second frequency is performed without time delay. The data modulated at the second frequency is received at the receiving device 750 after a time delay due to transmission from the repeater 740 to the receiving device 750. Data transmitted at the transmitting apparatus 700 during the first time interval is received at the receiving apparatus 750 during the second time interval. In this case, the first time period and the second time period are included in the same frame period. The second time period is divided into a first time delay according to the transmission from the transmission apparatus 700 to the relay apparatus 740 and a second time delay according to the transmission from the relay apparatus 740 to the reception apparatus 750 And is delayed by two time delays.

According to the embodiment shown in FIG. 7, data can be transmitted from the transmission apparatus 700 via the relay apparatus 740 to the reception apparatus 750 using one frame period.

8 is a block diagram illustrating the structure of a transmission apparatus according to another exemplary embodiment.

The transmission apparatus according to the exemplary embodiment may further include a distance estimation unit 810 in addition to the configuration described in FIG.

The receiving unit 730 can measure the time from the transmission of the data modulated at the first frequency to the reception of the data modulated at the second frequency. The measured time reflects the time delay due to the transmission from the transmission device 700 to the relay device 740 and the time delay due to the transmission from the relay device 740 to the transmission device 700. [

The distance estimator 810 estimates the distance from the transmission device 700 to the relay device 750 based on the time point at which the data modulated at the first frequency is transmitted and the time at which the data modulated at the second frequency is received .

Propagation becomes weaker as the distance travels. In the case of the CDMA communication method, it is necessary to control the transmission power precisely for each transmission apparatus 700 in order to control the influence of interference. In this case, the transmitter 720 can control the transmission power based on the time of transmitting the data modulated with the first frequency and the time of receiving the data modulated with the second frequency. For example, the transmitting unit 720 may transmit the modulated data to the repeater 720 from the transmitting unit 720 based on the estimated distance based on the time of transmitting the data modulated at the first frequency and the time of receiving the data modulated at the second frequency, The transmission power of the second data to be modulated with the first frequency to the transmission power control unit 740 can be controlled.

9 is a block diagram showing the structure of a relay apparatus according to an exemplary embodiment.

The relay apparatus 900 according to the exemplary embodiment includes a receiving unit 910, a frequency modulating unit 920, and a transmitting unit 930.

The receiving unit 910 receives the data modulated at the first frequency from the transmitting apparatus 940. According to one aspect, the transmitter 940 transmits data modulated at a first frequency during a first time interval of the frame interval, and the receiver 910 receives data transmitted from the transmitter 940 to the relay device 900 And can receive the transmitted data during the first time interval delayed.

The frequency modulating unit 920 modulates the data modulated at the first frequency to a second frequency. The time delay required for modulation from the first frequency to the second frequency can be neglected with an extremely small value. Since the repeater 900 does not include a configuration for demodulating the data modulated at the first frequency to the baseband, the repeater 900 can be manufactured at a low price, a small size, and a small weight.

The transmitting unit 930 transmits the data modulated at the second frequency to the receiving device 950. The data modulated at the second frequency is received at the receiving device 950 after a time delay due to transmission from the relay device 900 to the receiving device 950. [ Receiver 950 may receive data modulated at a second frequency during a second time interval within the frame interval. In this case, the second time interval is included in the same frame period as the first time interval, and the second time interval is included in the first time interval from the transmission device 940 to the relay device 900, And a time interval delayed by a second time delay according to transmission from the relay apparatus 900 to the receiving apparatus 950. [

According to one aspect, the data modulated at the second frequency transmitted by the transmitting unit 930 is also transmitted to the transmitting apparatus 940. In this case, the transmission apparatus 940 receives the data modulated at the second frequency, and demodulates it to the baseband. The transmitting device 940 may compare the demodulated data with the transmitted data. If the demodulated data is the same as the transmitted data, the transmission apparatus 940 can determine that the data modulated at the first frequency has been successfully transmitted from the transmission apparatus 940 to the relay apparatus 900. That is, the transmitting apparatus 940 may receive the data modulated at the second frequency with an acknowledgment message (ACK) for the data modulated at the first frequency.

According to one aspect, the data modulated at the second frequency may be received at the transmitting apparatus 940 within a frame period including a first time interval and a second time interval. In this case, the transmitting apparatus 940 can receive an acknowledgment message (ACK) for the data within the frame period in which the data is transmitted.

According to one aspect, the transmitting device 940 can measure the time at which the transmitting device 940 transmits the data modulated at the first frequency and the time at which the transmitting device 940 receives the data modulated at the second frequency . In this case, the transmission apparatus can estimate the distance from the transmission apparatus 940 to the relay apparatus 900 based on the time difference between the measured points.

According to another aspect, the transmission apparatus 940 can control the transmission power based on a point of time when the data modulated at the first frequency is transmitted and a point at which the data modulated at the second frequency is received. For example, the transmission apparatus 940 may transmit the transmission data from the transmission apparatus 940 to the relay apparatus 940 based on the estimated distance based on the time when the data modulated with the first frequency is transmitted and the time when the data modulated with the second frequency is received. The transmission power of the second data to be modulated at the first frequency to be transmitted to the base station 900 can be controlled.

FIG. 10 is a flowchart illustrating steps of a transmission method according to an exemplary embodiment.

In step S1010, the transmitting apparatus modulates the data to the first frequency.

In step S1020, the transmitting apparatus transmits the data modulated at the first frequency to the relay apparatus. According to one aspect, a transmitting apparatus can transmit data modulated at a first frequency to a relay apparatus during a first time period included in the frame period.

The data modulated at the first frequency is modulated at the second frequency in the relay device. Here, the time for modulating from the first frequency to the second frequency is an extremely short time that can be neglected.

The data modulated at the second frequency is transmitted from the repeater to the receiver. The receiving device receives the data modulated at the second frequency and demodulates it to the baseband. The receiving apparatus can decode the baseband demodulated data and grasp the contents thereof.

The data modulated at the second frequency is received at the receiving device after a time delay due to transmission from the relay device to the receiving device. Data transmitted at the transmitting apparatus during the first time interval is received at the receiving apparatus during the second time interval. In this case, the first time period and the second time period are included in the same frame period. The second time interval is a time interval delayed by a second time delay corresponding to transmission from the relay apparatus to the receiver apparatus, from the first time interval according to the transmission from the transmission apparatus to the relay apparatus from the first time interval.

11 is a flowchart illustrating a stepwise transmission method according to another exemplary embodiment.

According to one aspect, the data modulated at the second frequency transmitted from the relay apparatus to the receiving apparatus can be transmitted not only to the receiving apparatus but also to the transmitting apparatus.

In this case, in step S1110, the transmitting apparatus can receive the data modulated at the second frequency. The transmitting apparatus can demodulate the data modulated at the second frequency to the baseband and decode the data. The transmitting apparatus can compare the decoded data with the data modulated and transmitted at the first frequency. If the content of the decoded data is the same as the content of the data modulated at the first frequency, the transmitting apparatus can determine that the data modulated at the first frequency has been successfully transmitted to the relay apparatus. That is, the transmitting apparatus can receive the data modulated at the second frequency with an acknowledgment message (ACK) for the data modulated at the first frequency.

In step S1120, the transmission apparatus can estimate the distance from the transmission apparatus to the relay apparatus. The transmission apparatus can measure the time from the transmission of the data modulated at the first frequency to the reception of the data modulated at the second frequency. The measured time reflects the time delay due to the transmission from the transmitting device to the relay device and the time delay due to the transmission from the relay device to the transmitting device.

The transmission apparatus can estimate the distance from the transmission apparatus to the relay apparatus based on the time point at which the data modulated at the first frequency is transmitted and the point at which the data modulated at the second frequency is received.

12 is a flowchart illustrating a stepwise transmission method according to another exemplary embodiment.

According to one aspect, the data modulated at the second frequency transmitted from the relay apparatus to the receiving apparatus can be transmitted not only to the receiving apparatus but also to the transmitting apparatus.

In this case, in step S1210, the transmitting apparatus can receive the data modulated at the second frequency.

In step S1220, the transmitting apparatus can control the transmission power based on a point of time at which the data modulated at the first frequency is transmitted and a point at which the data modulated at the second frequency is received. For example, the transmitting apparatus may transmit data from the transmitting apparatus to the relay apparatus at a first frequency based on the estimated distance based on the time when the data modulated with the first frequency is transmitted and the time when the data modulated with the second frequency is received The transmission power of the second data to be modulated and transmitted can be controlled.

13 is a flowchart illustrating steps of a relaying method according to an exemplary embodiment.

In step S1310, the relay apparatus receives the data modulated at the first frequency from the transmission apparatus. According to one aspect, a transmitting apparatus transmits data modulated at a first frequency during a first time interval of a frame interval, and the relay apparatus transmits data transmitted during a first time interval delayed due to transmission from the transmitting apparatus to a relay apparatus .

In step S1320, the relay apparatus modulates the data modulated at the first frequency to the second frequency. The time delay required for modulation from the first frequency to the second frequency can be neglected with an extremely small value.

In step S1330, the relay apparatus transmits the data modulated at the second frequency to the receiving apparatus. The data modulated at the second frequency is received at the receiving device after a time delay due to transmission from the relay device to the receiving device. The receiving device may receive the data modulated at the second frequency during the second time interval. In this case, the second time period is included in the same frame period as the first time period, and the second time period includes a first time delay according to the transmission from the transmission apparatus to the relay apparatus from the first time period, And is delayed by a second time delay according to transmission to the device.

According to one aspect, the data modulated at the second frequency transmitted by the relay apparatus is also transmitted to the transmission apparatus. In this case, the transmitting apparatus receives the data modulated at the second frequency and demodulates it to the baseband. The transmitting apparatus can compare the demodulated data with the transmitted data. If the demodulated data is the same as the transmitted data, the transmitting apparatus can determine that the data modulated at the first frequency from the transmitting apparatus to the relay apparatus has been successfully transmitted. That is, the transmitting apparatus can receive the data modulated at the second frequency with an acknowledgment message (ACK) for the data modulated at the first frequency.

According to one aspect, the transmitting apparatus can measure the time at which the transmitting apparatus transmits the data modulated at the first frequency and the time at which the transmitting apparatus receives the data modulated at the second frequency. In this case, the transmission apparatus can estimate the distance from the transmission apparatus to the relay apparatus based on the time difference between the measured points.

According to another aspect of the present invention, the transmission apparatus can control the transmission power based on a point of time when the data modulated at the first frequency is transmitted and a point at which the data modulated at the second frequency is received. For example, the transmitting apparatus may perform modulation from the transmission apparatus to the relay apparatus at the first frequency based on the estimated distance based on the time when the data modulated with the first frequency is transmitted and the time when the data modulated with the second frequency is received. So that the transmission power of the second data to be transmitted can be controlled.

14 is a diagram illustrating operation of a communication network system under a topology according to an exemplary embodiment.

Referring to FIG. 14, the relay apparatus 1410 can perform relaying between heterogeneous networks such as the distributed network 1420 and the centralized network 1430. At this time, peer-to-peer communication may be established between the relay apparatus 1410 and the communication node 1421 of the distributed network 1420. Uplink / downlink communication between the coordinator 1431 and the relay device 1410 is performed in the centralized network 1430 and communication nodes 1432 in the centralized network 1430 communicate with the distributed network 1430 via the coordinator 1431. [ Lt; RTI ID = 0.0 > 1420 < / RTI >

15 is a diagram illustrating operation of a communication network system under a topology according to another exemplary embodiment.

Referring to FIG. 15, the communication terminal 1520 can communicate with the centralized network 1530 via the relay device 1510. The communication node 1532 of the centralized network 1530 can communicate with the communication terminal 1520 via the coordinator 1531 as described with reference to FIG. On the other hand, in FIG. 15, the communication terminal 1520 can access the Internet 1540 via the centralized network 1530. That is, even if there is no internet resource available within the one-hop range of the communication terminal 1520, the communication terminal 1520 can use the Internet 1540 via the coordinator 1531 and the relay device 1510, The resource allocation for use of the resource 1540 can be processed quickly by the present invention.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

110, 220, 420, 740, 900: Relay device
120, 210, 410, 700, 940: transmission device
130, 330, 750, 950: receiving device

Claims (17)

A relay apparatus for transmitting data received from a transmission apparatus to a reception apparatus,
A receiving unit for receiving the data modulated at the first frequency, the data transmitted during the first time interval;
A frequency modulator for modulating the data modulated with the received first frequency to a second frequency; And
And a transmitter for transmitting the data modulated at the second frequency to the receiver,
Lt; / RTI >
Wherein the data modulated at the second frequency is received at the receiving device during a second time interval,
Wherein the first time interval and the second time interval are included in the same frame interval and the second time interval includes a first time delay according to transmission from the transmission apparatus to the relay apparatus from the first time interval, And delayed by a second time delay according to transmission from the device to the receiving device. The method according to claim 1,
Wherein the data modulated at the second frequency is received at the transmission apparatus within the frame period by an acknowledgment message (ACK) for data modulated at the first frequency. The method according to claim 1,
Wherein the transmitted data at the second frequency is received at the transmitting apparatus,
Wherein the distance from the relay apparatus to the transmission apparatus is estimated based on a time point at which the transmission apparatus transmits the data modulated at the first frequency and a point at which the transmission apparatus receives the data modulated at the second frequency, . The method according to claim 1,
Wherein the transmitted data at the second frequency is received at the transmitting apparatus,
Wherein the transmission apparatus modulates the transmission apparatus at the first frequency based on a time at which the transmission apparatus transmits the data modulated at the first frequency and a time at which the transmission apparatus receives the data modulated at the second frequency, 2 transmission power of data is controlled. A transmitting apparatus for transmitting data to a receiving apparatus via a relay apparatus,
A modulator for modulating the data to a first frequency; And
A transmitter for transmitting the data modulated at the first frequency to the relay device during a first time interval;
Lt; / RTI >
Wherein the data modulated at the first frequency is modulated at a second frequency in the relay device and the data modulated at the second frequency is received at the receiving device during a second time interval,
Wherein the first time interval and the second time interval are included in the same frame interval and the second time interval includes a first time delay according to transmission from the transmission apparatus to the relay apparatus from the first time interval, And delayed by a second time delay according to transmission from the device to the receiving device. 6. The method of claim 5,
A receiver for receiving the data modulated at the second frequency from the relay device in the frame interval with an acknowledgment message (ACK) for the data modulated at the first frequency,
Further comprising: 6. The method of claim 5,
A receiving unit for receiving data modulated at the second frequency from the relay apparatus; And
A distance estimator for estimating a distance from the transmission apparatus to the relay apparatus based on a time point at which the data modulated at the first frequency is transmitted and a point at which the data modulated at the second frequency point is received;
Further comprising: 6. The method of claim 5,
A receiver for receiving data modulated at the second frequency from the relay device,
Further comprising:
Wherein the transmission unit controls transmission power of the second data to be modulated at the first frequency based on a time point at which the data modulated at the first frequency is transmitted and a point at which the data modulated at the second frequency is received, Device. An operation method of a relay apparatus for transmitting data received from a transmission apparatus to a reception apparatus,
Receiving data modulated at a first frequency transmitted by the transmitting apparatus during a first time interval;
Modulating the data modulated with the received first frequency to a second frequency; And
Transmitting the data modulated at the second frequency to the receiving device
Lt; / RTI >
Wherein the data modulated at the second frequency is received at the receiving device during a second time interval,
Wherein the first time interval and the second time interval are included in the same frame interval and the second time interval includes a first time delay according to transmission from the transmission apparatus to the relay apparatus from the first time interval, And delaying by a second time delay according to transmission from the device to the receiving device. 10. The method of claim 9,
Wherein the data modulated at the second frequency is received at the transmitting apparatus within the frame period by an acknowledgment message (ACK) for the data modulated at the first frequency. 10. The method of claim 9,
Wherein the transmitted data at the second frequency is received at the transmitting apparatus,
Wherein the distance from the relay apparatus to the transmission apparatus is estimated based on a time point at which the transmission apparatus transmits the data modulated at the first frequency and a point at which the transmission apparatus receives the data modulated at the second frequency, Lt; / RTI > 10. The method of claim 9,
Wherein the transmitted data at the second frequency is received at the transmitting apparatus,
Wherein the transmission apparatus modulates the transmission apparatus at the first frequency based on a time at which the transmission apparatus transmits the data modulated at the first frequency and a time at which the transmission apparatus receives the data modulated at the second frequency, 2 transmission power of data is controlled. A method of operating a transmitting apparatus for transmitting data to a receiving apparatus via a relay apparatus,
Modulating the data to a first frequency; And
Transmitting the data modulated at the first frequency to the relay device during a first time interval
Lt; / RTI >
Wherein the data modulated at the first frequency is modulated at a second frequency in the relay device and the data modulated at the second frequency is received at the receiving device during a second time interval,
Wherein the first time interval and the second time interval are included in the same frame interval and the second time interval includes a first time delay according to transmission from the transmission apparatus to the relay apparatus from the first time interval, And delaying by a second time delay according to transmission from the device to the receiving device. 14. The method of claim 13,
Receiving data modulated with the second frequency from the relay device in the frame interval with an acknowledgment message (ACK) for data modulated with the first frequency
Further comprising the steps of: 14. The method of claim 13,
Receiving data modulated at the second frequency from the relay apparatus; And
Estimating a distance from the transmission apparatus to the relay apparatus based on a time point at which the transmission apparatus transmits the data modulated at the first frequency and a point at which the transmission apparatus receives the data modulated at the second frequency;
Further comprising the steps of: 14. The method of claim 13,
Receiving data modulated at the second frequency from the relay apparatus; And
Controlling the transmission power of the second data to be modulated with the first frequency and being transmitted based on the time of transmitting the data modulated with the first frequency and the time of receiving the data modulated with the second frequency,
Further comprising the steps of: A computer-readable recording medium on which a program for executing the method according to any one of claims 9 to 16 is recorded.
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