KR20100132434A - Transmitter, receiver and method for extending coverage in wlan - Google Patents

Abstract

PURPOSE: A transmitter, a receiver and a method for extending coverage in WLAN are provided to receive the data between the target receiver and neighboring devices through cooperative MIMO. CONSTITUTION: A group forming unit(510) builds a transmission group with neighboring devices capable of local area network communication. A distribution unit(520) distributes the transmitted data about the target receiver to neighboring devices. A communication unit(530) transmits the distributed data through the frequency band for the local area network to neighboring devices. The communication unit transmits the distributed data through the cooperative Multiple Input Multiple Output mode with the receiving group of the target receiver.

Description

Transmitter, receiver and method for extending coverage in short-range wireless communication network, and receiving apparatus {Transmitter, receiver and method for extending coverage in WLAN}

The present invention relates to a transmission apparatus and a transmission method for coverage extension in a short range wireless communication network, and a reception apparatus. The present invention relates to a transmission apparatus and transmission for coverage extension in a short range wireless communication network capable of long-distance communication while transmitting data in units of Gbps. And a receiving apparatus.

The present invention is derived from a study conducted as part of the IT new growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task management number: 2007-S-002-03, Task name: Multi-Gigabit wireless interface technology development] ].

In a wireless communication network, the 60 GHz frequency band may transmit data in multi-Gbps units. However, data transmitted through the 60 GHz frequency band cannot pass through walls or doors inside a building, and attenuation is large when passing through a human body, and thus a communication distance may be shortened according to the environment. Therefore, the 60 GHz frequency band is mainly used for near field communication of about 10m.

On the other hand, the 5GHz frequency band can be used for long distance communication of about 100m, but the data rate is low because it transmits data in units of hundreds of Mbps. Therefore, there is a need to propose a technology capable of long-distance communication while transmitting data in units of multi-Gbps.

Accordingly, an object of the present invention to solve the above problems is to provide a transmitter, a transmission method, and a receiver for coverage expansion in a short-range wireless communication network capable of long-distance communication while transmitting data in units of Gbps.

In the short-range wireless communication network according to an embodiment of the present invention, a transmitter for coverage expansion includes a group forming unit forming a transmission group with peripheral devices capable of short-range communication; A distribution unit distributing data to be transmitted to a target receiver to the peripheral devices; And transmitting the distributed data to the peripheral devices through the frequency band for short-range communication, and using the cooperative multiple input multiple output (MIMO) scheme in cooperation with the peripheral devices, the distributed data to the target. The receiver may include a communication unit for transmitting to a reception group to which the receiver belongs.

The peripheral devices and the communication unit may transmit the distributed data to the reception group using the frequency band.

The group forming unit requests the target receiver to form the receiving group, and the target receiver forms the receiving group with neighboring devices neighboring the target receiver.

The frequency band may be a 60GHZ frequency band.

On the other hand, the transmitter for coverage expansion in a short-range wireless communication network according to an embodiment of the present invention, the distribution unit for distributing data to be transmitted to the target receiver to the peripheral devices belonging to the same network; And transmitting the distributed data to the peripheral devices through a first frequency band for short range communication, and performing a first frequency band or long range communication for the short range communication using a cooperative MIMO scheme with the peripheral devices. And a communication unit configured to transmit the distributed data to a reception group to which the target receiver belongs through a second frequency band.

If the data rate is less than a reference value when transmitting the divided data to the receiving group through the first frequency band, the communication unit is controlled to change the first frequency band to the second frequency band and transmit the divided data. The control unit may further include a.

And performing a device search to search for the target receiver, and requesting the target receiver to form a reception group with neighboring devices located in the receiving network, wherein the target receiver is adjacent to the target receiver. The receiving group may be formed with neighboring devices.

The first frequency band may be a 60 GHz frequency band, and the second frequency band may be a frequency band within 5 GHz.

On the other hand, the transmission method for coverage expansion in a short-range wireless communication network according to an embodiment of the present invention, forming a transmission group with the peripheral devices capable of short-range communication; Distributing data to the peripheral devices for transmission to a target receiver; Transmitting the distributed data to the peripheral devices through the frequency band for short-range communication; And transmitting the distributed data to a reception group to which the target receiver belongs by using a collaborative MIMO scheme with the peripheral devices.

In the transmitting to the receiving group, the distributed data may be transmitted using the frequency band for the short range communication.

Prior to the forming, the method may further include requesting the target receiver to form the reception group, wherein the target receiver may form the reception group with neighboring devices neighboring the target receiver.

On the other hand, the transmission method for coverage expansion in a short-range wireless communication network according to an embodiment of the present invention, the step of distributing data to be transmitted to the target receiver to the peripheral devices belonging to the same network; Transmitting the distributed data to the peripheral devices through a first frequency band for near field communication; And transmitting the distributed data to a reception network to which the target receiver belongs through a first frequency band for short range communication or a second frequency band for long range communication using a cooperative MIMO scheme with the peripheral devices. It may include.

The transmitting to the receiving group may include: changing the first frequency band to the second frequency band when the data rate is equal to or less than a reference value when transmitting the divided data to the receiving group through the first frequency band. Data can be transferred.

Prior to the dispensing step, performing a device search to retrieve the target receiver; And requesting the target receiver to form a reception group with neighboring devices located in the reception network.

On the other hand, the receiver for extending coverage in a short-range wireless communication network according to an embodiment of the present invention, the communication unit for receiving data through a frequency band for short-range communication from neighboring neighboring devices; And a decoder which collects and decodes each data received from the neighboring devices, and each of the neighboring devices may receive the data through a cooperative MIMO scheme from transmission devices belonging to a transmission group.

The neighboring devices may perform MIMO detection on the received data, detect the corresponding data, and transmit the detected data to the communication unit.

The apparatus may further include a group forming unit configured to form a reception group with the neighboring neighboring devices by a request of an access point located in the transmission group or a source transmitter that requests data transmission.

According to the proposed embodiment of the present invention, when the 60 GHz band is used, the attenuation is large, so that long distance communication is difficult, and when the 5 GHz band is used, the data rate is low. This is because the source transmitter distributes the data to be transmitted to the peripheral devices through the 60 GHz band and then transmits the data to the reception group through the band below 5 GHz using cooperative MIMO with the peripheral devices. In addition, the source transmitter transmits data to be transmitted to the reception group simultaneously with the peripheral device, and the target receiver and its neighbor devices receive the data through cooperative MIMO, thereby increasing the total throughput in the network with increased capacity. As a result, coverage can be extended by transmitting data in units of Gbps even between different networks.

1 to 4 are diagrams for explaining a process for extending coverage in a short-range wireless communication network according to an embodiment of the present invention;
5 is a block diagram showing a transmitter for coverage expansion in a short range wireless communication network according to a first embodiment of the present invention;
6 is a block diagram illustrating a receiving apparatus for coverage extension in a short range wireless communication network according to a first embodiment of the present invention;
7 is a block diagram showing an apparatus for extending coverage in a short range wireless communication network according to a second embodiment of the present invention;
8 is a flowchart illustrating a transmission method for coverage extension in a short-range wireless communication network according to a first embodiment of the present invention;
9 is a flowchart illustrating a transmission method for coverage extension in a short-range wireless communication network according to a second embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terminology used herein is a term used to properly express a preferred embodiment of the present invention, which may vary according to a user, an operator's intention, or a custom in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

1 to 4 are diagrams for explaining a process for coverage extension in a short-range wireless communication network according to an embodiment of the present invention.

First, in order to realize multi-gigabit wireless home networking, an embodiment of the present invention may use a 60 GHz frequency band and a frequency band of 5 GHz or less in a hybrid form. For example, an embodiment of the present invention uses a 60 GHz frequency band, and may include a wireless personal area network (WPAN) technology such as IEEE 802.15.3c, ECMA 387, or IEEE 802 11ad, and uses a frequency band of 5 GHz or less. As an example of the technique, an IEEE 802.11 Wireless Local Area Network (WLAN) using an ISM band (Industrial, Scientific, and Medical Band) may be mentioned.

In an embodiment of the present invention, a network of 5 GHz or less band may be referred to as WLAN, and a network of 60 GHz band is WPAN based on the range, but is not limited thereto. In addition, devices located in a short range wireless communication network may transmit and receive signals in both 60 GHz and 5 GHz bands.

As shown in FIG. 1, when a wireless communication network is applied to a home network, the WPAN is formed in a wall-blocked area unit, and the WLAN covers the entire home network. In the case of Fig. 1, three WPANs are formed (WPAN1, WPAN2, WPAN3).

Hereinafter, a case in which data is transmitted from a WPAN1, that is, an external hard drive device (HDD) located in room 1 to a TV of WPAN2 will be described as an example. An example of data is video streaming transmitted at 3 Gbps.

Since the TV is outside the effective coverage of the WPAN1, the WPAN1 may perform device discovery through the WLAN. For example, the first access point AP1 of the WPAN1 may perform a device search to determine to which WPAN the TV is located, whether the TV is currently able to communicate, or the like, at the request of the HDD. Device discovery may be performed directly by the HDD. When the device search is performed, the HDD checks the peripheral devices in the communicable state located in WPAN1.

As shown in FIG. 2, the HDD may distribute data to be transmitted to the TV to each peripheral device and transmit the distributed data through the first frequency band. This is because 3 Gbps data streaming in the WLAN is difficult, so to have an effect of 3 Gbps using a plurality of peripherals.

Hereinafter, a printer, a PC, a digital camera, and AP1 are used as peripheral devices, and a projector, a mobile phone (MP), and AP2 are described as examples.

Referring to FIG. 3, the HDD and peripheral devices of the HDD located in WPAN1 and the neighboring devices of the TV and TV located in WPAN2 may perform cooperative Multiple Input Multiple Output (MIMO). Cooperative MIMO may be performed through a first frequency band for short range communication or a second frequency band for long range communication. The first frequency band may be a frequency band of 60 GHz and the second frequency band of 5 GHz or less.

At this time, the transmission position of the data transmitted from the WPAN1 is different, each data passes through the wall, so the data transmission environment corresponds to a rich scattering environment. Therefore, it is suitable to see cooperative MIMO effect and spatial multiplexing can be used.

In addition, in communication between a transmission group located in WPAN1 and a reception group located in WPAN2, an access point (not shown) of a WLAN broadcasts or an RTS / CTS (Request to Send / Clear to) By performing a send), devices not belonging to the transmission group and the reception group may not participate in the transmission and reception of data.

By the cooperative MIMO as shown in FIG. 3, the HDD and the peripheral devices transmit data to the TV and neighboring devices of the TV located in WPAN2, and the neighboring devices of the TV and the TV may perform MIMO detection.

MIMO detection can be performed in two ways, and is classified into a closed loop MIMO and an open loop MIMO depending on whether channel status information of each link can be informed to the transmitting apparatus as feedback.

In case of closed loop MIMO, each transmitter transmits data by changing the phase before transmission by using precoding method in order to reflect feedback information, and each receiver receives the maximum number of antennas provided in each receiver by stream only. You can restore the stream of. That is, each receiver may restore streams corresponding to the maximum number of antennas provided in each receiver without using stream information received by other receivers. Each receiver transmits the recovered stream to the final target receiver.

On the other hand, when using open loop MIMO due to the overhead of feeding back channel state information of each link or other reasons, each receiver must exchange information detected by the receiver (including hard decision and soft decision values) through air. do. To this end, if each receiver sends a soft decision value as it is, the data rate is increased, and thus, the detected information can be quantized and sent. In addition, each receiver may apply an iteration to increase MIMO detection performance. At this time, each receiver can coarse-fine the quantization level according to the algorithm used and send the detected information.

As described above, each receiver may perform centralized MIMO detection of moving the stream received by each receiving device to one receiver, or may perform distributed MIMO detection performed simultaneously by a plurality of receivers. . In addition, each receiver sends the stream obtained by the detection to the target receiver, so that the target receiver can recover the multiple streams.

If the target receiver fails to recover some of the streams, the target receiver may inform the transmitter of information about the unrestored streams. As a result, the transmitter adaptively performs cooperative MIMO transmission according to the capacity that can be sent in the channel in the next transmission.

Referring to FIG. 4, neighboring devices may transmit corresponding data detected by MIMO detection to a TV through a 60 GHz band. The TV may collect and decode data detected by the TV and data transmitted from neighboring devices. The decoded data may be provided to the TV in a viewable form.

As described above, when the source transmitter HDD of the WPAN1 transmits data to the target receiver TV of the WPAN2, the source transmitter distributes the data to be transmitted to peripheral devices of the WPAN1. In addition, the source transmitter and the peripheral devices each perform cooperative MIMO by transmitting distributed data to a reception group, thereby extending coverage in a short range wireless communication network.

On the other hand, since WPAN1 and WPAN2 do not belong to each other in effective coverage, they do not interfere with each other. Therefore, since WPAN1 can use Spatial Reuse, WPAN1 and WPAN3 can also communicate within the home network. In addition, according to the proposed embodiment, since a control signal or a beacon such as an ACK has a small data rate, the control signal or the beacon may be transmitted through a point-to-point or an AP of a transceiver (for example, an HDD and a TV) without using cooperative MIMO. As a result, latency can be reduced. An example of the ACK is to inform the HDD that the receiving group's TV has successfully received data.

5 is a block diagram illustrating an apparatus for extending coverage in a short range wireless communication network according to a first embodiment of the present invention.

Referring to FIG. 5, the transmitter 500 may include a first group forming unit 510, a first distribution unit 520, and a first communication unit 530. The transmitter 500 is a source transmitter for transmitting data to the target receiver 600 located in another network. All devices located in WPAN1 of FIG. 1 may be a transmitter or a receiver. Hereinafter, the HDD will be described as an example of the transmitter 500. In addition, the target receiver 600 may be a device located in a network other than WPAN1. Hereinafter, a TV of WPAN2 will be described as an example.

The first group forming unit 510 may determine whether the target receiver 600 is in a communicable state by performing device discovery. For example, the first group forming unit 510 inquires whether the target receiver 600 can communicate with the first access point AP1 of WPAN1, and the first access point AP1 accesses the second access of WPAN2. The point AP2 can be checked by inquiring whether the target receiver 600 can communicate.

If the target receiver 600 is in a valid state, that is, in a communicable state, the first group forming unit 510 may form a transmission group with peripheral devices capable of short-range communication. The peripheral devices may be in a state where communication is possible among devices located in the WPAN1. Therefore, the transmission group may consist of all the devices located in WPAN1 or part of them.

In addition, when the target receiver 600 is in a communicable state, the first group forming unit 510 may request the target receiver 600 to form a reception group. The target receiver 600 may form a reception group with neighboring devices neighboring the target receiver 600 of the network in which the target receiver 600 is located. For example, the target receiver 600 may form a reception group together with neighboring devices currently in a communication state among devices located in the WPAN2 and transmit the received group to the transmitter 500.

When the transmission group and the reception group are formed, the first group forming unit 510 may provide the first distribution unit 520 with a list of peripheral devices belonging to the transmission group.

The first distributor 520 may distribute data to be transmitted to the target receiver 600 to the peripheral devices. The first distribution unit 520 may distribute data to be transmitted to each peripheral device based on the list of peripheral devices received from the first group forming unit 510.

The first communication unit 530 may perform short-range communication with peripheral devices of the same network (eg, WPAN1). The first communication unit 530 may inquire whether the peripheral devices in the WPAN1 are in a communicable state, and may provide the first group forming unit 510 with a list of peripheral devices in the communicable state.

In addition, the first communication unit 530 may transmit data distributed to peripheral devices through a frequency band for short-range communication. In this case, the first communication unit 530 may communicate using a frequency band for short-range communication. The frequency band for short range communication may be a 60 GHz band.

In addition, the first communication unit 530 may perform short-range or long-distance communication with an external network (eg, WPAN2). In particular, the first communication unit 530 may transmit the distributed data to a reception group to which the target receiver 600 belongs, using a collaborative MIMO scheme with peripheral devices. In this case, the first communication unit 530 may transmit data to the reception group through a frequency band for short-range communication.

The peripheral devices of the transmitter 500 may include a second communication unit 540 and a determination unit 550. For convenience of description, a PC is described as an example. When the second communication unit 540 receives a message asking whether the communication device 500 is in a communicable state, the second communication unit 540 may transfer the received message to the determination unit 550.

The determination unit 550 may determine the current communication capability of the PC and determine whether the communication is possible. The second communication unit 540 may transmit the determination result of the determination unit 550 to the transmitting device 500.

6 is a block diagram illustrating a receiving apparatus for coverage extension in a short range wireless communication network according to a first embodiment of the present invention.

Referring to FIG. 6, each neighboring device belonging to a receiving group may receive data from transmitting devices of WPAN1 through a cooperative MIMO scheme. The neighboring devices may perform MIMO detection on the received data to detect data to be received by the neighboring devices. The neighboring devices may transmit the detected data to the target receiver 600.

The target receiver 600 may include a third communication unit 610, a second group forming unit 620, a MIMO detection unit 630, and a decoding unit 640. The third communication unit 610 may know in advance that data is to be transmitted from the transmitting device 500 by a device searching process of the transmitting device 500. The third communication unit 610 may receive data detected from neighboring devices of the target receiver 600 through a frequency band for short-range communication. The frequency band for short range communication may be 60 GHz.

The second group forming unit 620 may form a reception group with neighboring neighboring devices according to a request of the first access point AP1 located in the transmission group or the transmission apparatus 500 to transmit data. The third communication unit 610 may notify the target receiver 600 of the transmission group and the neighboring devices that the reception group has been formed, and may notify that communication will be performed according to the cooperative MIMO scheme.

The MIMO detecting unit 630 may detect data that the target receiver 600 should actually receive, among data received by the third communication unit 610 by the MIMO scheme.

The decoder 640 may collect and decode the data detected by the MIMO detector 630 and each data received from neighboring devices. Since the target receiver 600 is a TV, the decoded data may be displayed on the TV.

7 is a block diagram illustrating a transmitter for coverage extension in a short range wireless communication network according to a second embodiment of the present invention.

The transmitter 700 is a source transmitter for transmitting data to a target receiver located in another network. The target receiver is a device located in a network different from the transmitter 700 and is a device that will receive data. Hereinafter, the HDD of the devices located in WPAN1 as the transmitter 700 and the TV of WPAN2 as the target receiver will be described as an example.

Referring to FIG. 7, the transmitter 700 may include a controller 710, a second distributor 720, and a fourth communication unit 730.

The controller 710 may search for a target receiver (TV) by performing device discovery. If the target receiver TV is found to be communicable by the device search, the controller 710 may identify peripheral devices and neighbor devices that will participate in the collaborative MIMO.

For example, the controller 710 may determine devices located in the same network as the transmitter 700 as peripheral devices to participate in the cooperative MIMO. When the device search is performed, the first access point AP1 may broadcast and wait to devices to participate in MIMO according to a request of the controller 710. Alternatively, the first access point AP1 may perform RTS / CTS with all devices belonging to the WLAN to identify devices to participate in the cooperative MIMO. Thus, devices that do not belong to WPAN1 and WPAN2 may not participate in data transmission and reception.

The peripheral devices and the transmitter 700 to participate in the collaborative MIMO may be included in the transmission group, and the neighboring devices and the target receiver (TV) may be included in the reception group.

When the peripheral devices and neighboring devices to participate in the collaborative MIMO are identified, the second distribution unit 720 may distribute data to be transmitted to the target receiver device (TV) to the peripheral devices.

The fourth communication unit 730 may perform short-range communication with peripheral devices located in the same network (eg, WPAN1) through a first frequency band. Therefore, the fourth communication unit 730 may transmit data distributed through the first frequency band to the peripheral devices.

In addition, the fourth communication unit 730 receives the distributed data to which the target receiver TV belongs through the first frequency band or the second frequency band for long distance communication by using a cooperative MIMO scheme with peripheral devices. Can be sent to a group. The receiving group may be located in a network to which the target receiver (TV) belongs and may include devices participating in cooperative MIMO.

The first frequency band may be a 60 GHz band for transmitting data in units of Gbps as a band for short-range communication. The second frequency band is a band for long distance communication and may be, for example, a band within 5 GHz capable of transmitting data up to about 100 m.

In detail, the controller 710 may compare the data rate with a set reference value when transmitting data to the reception group through the first frequency band, and determine whether to use the second frequency band according to the comparison result. For example, if the data rate in the case of using the first frequency band is less than or equal to the set reference value, the controller 710 determines that transmission is impossible at a desired data rate due to the large attenuation. Therefore, the controller 710 may control the fourth communication unit 730 and the peripheral devices to transmit the distributed data to the reception group through the second frequency band.

Meanwhile, operations of the peripheral devices have been described with reference to FIG. 6 and thus will be omitted.

In addition, the target receiver TV and the neighboring devices according to the second embodiment of the present invention may receive data from the transmission group by a cooperative MIMO scheme. The target receiver (TV) and the neighboring devices may receive data through the second frequency band. As a result, attenuation due to data transmission can be minimized.

The neighboring devices may perform MIMO detection on the data received through the second frequency band, detect the corresponding data, and transmit the detected data to the target receiver (TV). In this case, the neighboring devices may transmit the detected data through the first frequency band. The target receiver TV may collect and decode the received data.

8 is a flowchart illustrating a transmission method for coverage extension in a short-range wireless communication network according to the first embodiment of the present invention.

5 and 8, in operation 810, the first group forming unit 510 of the transmitting apparatus 700 to transmit data may determine whether the target receiver TV is in a communicable state by performing a device search. .

In operation 820, if the target receiver TV is in a valid state, that is, in a communicable state, in operation 830, the first group forming unit 510 may request the target receiver TV to form a reception group. .

In operation 840, the first group forming unit 510 forms a transmission group with peripheral devices capable of short-range communication, and the target receiver TV is a target receiver TV of a network in which the target receiver TV is located. ) And a reception group with neighboring neighboring devices.

The transmission group includes peripheral devices capable of short-range communication with the transmitter 700 and may be located in the same network as the transmitter 700. The reception group includes neighboring devices capable of short-range communication with the target receiver TV, and may be located in the same network as the target receiver TV.

In operation 850, the first group forming unit 510 provides a list of peripheral devices to the first distribution unit 520, and the first distribution unit 520 supplies the data to be transmitted to the target receiver TV. Can be distributed to

In operation 860, the first communication unit 530 may transmit distributed data to peripheral devices located in a transmission group through a frequency band. At this time, the frequency band used is a frequency band for short-range communication, it may be a 60GHz band.

In operation 870, the first communication unit 530 may transmit the distributed data to a reception group to which the target receiver TV belongs, using a collaborative MIMO scheme with peripheral devices. The first communication unit 530 may transmit data to a receiving group through a frequency band for short range communication.

Through the frequency band for short-range communication, peripheral devices and a target receiver (TV) of a reception group that have received data in a cooperative MIMO scheme may detect the corresponding data by performing MIMO detection. The peripheral devices may transmit data detected by MIMO detection to the target receiver TV through the same frequency band. The target receiver TV may collect and decode each received data and data detected by the target receiver TV. The decoded data may be stored according to product characteristics of the target receiver (TV), provided to the viewer, or transmitted to another device.

9 is a flowchart illustrating a transmission method for coverage extension in a short-range wireless communication network according to a second embodiment of the present invention.

In operation 910, the controller 710 of the transmitting apparatus 700 may determine whether the target receiver TV is in a communicable state by performing a device search.

In operation 920, if the target receiver TV is in a valid state, in operation 930, the controller 710 may identify peripheral devices and neighbor devices that will participate in the cooperative MIMO.

In operation 940, the second distributor 720 may distribute data to be transmitted to the target receiver TV to the peripheral devices.

In operation 950, the fourth communication unit 730 may transmit the distributed data to the peripheral devices through the first frequency band. At this time, the frequency band used is a frequency band for short-range communication, it may be a 60GHz band.

In operation 960, the controller 710 may compare the data rate with a set reference value when transmitting data to the reception group through the first frequency band.

In operation 970, when the data rate is less than or equal to the set reference value, the controller 710 may control the fourth communication unit 730 and the peripheral devices to transmit the distributed data to the reception group through the second frequency band.

In contrast, in operation 980, when the data rate is greater than the set reference value, the controller 710 may control the fourth communication unit 730 and the peripheral devices to transmit the distributed data to the reception group through the first frequency band. This means that the data rate is larger than the set reference value means that the attenuation is not large, and that data can be transmitted at a desired data rate.

In the above-described embodiment of the present invention, when the 60 GHz band is used, multi-Gbps data can be transmitted, and when the 5 GHz or less band is used, the same transmission power of WLAN can have coverage of up to 100 m. It can be created. Thus, compared to a system using only one band, the coverage is extended based on the 60 GHz band, and the throughput is improved when the 5 GHz band is used.

In addition, according to an embodiment of the present invention, when the density of the device in the network is large as well as the environment of large power attenuation, such as 60 GHz band to form a group consisting of devices in close proximity to the network when the point-to-point communication throughput, The cooperative MIMO between groups can improve the reception SNR by reducing interference and increasing reception power.

Methods according to an embodiment of the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

500: transmitter 510: first group forming unit
520: first distribution unit 530: first communication unit
600: target receiver 610: third communication unit
620: second group forming unit 630: MIMO detection unit

Claims (19)

A group forming unit forming a transmission group with peripheral devices capable of short range communication;
A distribution unit distributing data to be transmitted to a target receiver to the peripheral devices; And
The distributed data is transmitted to the peripheral devices through the frequency band for the near field communication, and the distributed data is transmitted to the target receiver using a cooperative multiple input multiple output (MIMO) scheme. Communication unit transmitting to the reception group to which the device belongs
Transmitter for coverage expansion in a short-range wireless communication network comprising a. The method of claim 1,
And the peripheral devices and the communication unit transmit the distributed data to the receiving group using the frequency band. The method of claim 1,
And the group forming unit requests the target receiver to form the receiving group, and the target receiver forms a receiving group with neighboring devices neighboring the target receiver. The method of claim 1,
And the frequency band is a 60GHZ frequency band for transmitting coverage in a short range wireless communication network. A distribution unit for distributing data to be transmitted to a target receiver to peripheral devices belonging to the same network; And
Transmitting the distributed data to the peripheral devices through a first frequency band for short-range communication, and using a cooperative multiple input multiple output (MIMO) scheme with the peripheral devices, the first for short-range communication. A communication unit for transmitting the distributed data to a receiving group to which the target receiver belongs through a frequency band or a second frequency band for long distance communication
Transmitter for coverage expansion in a short-range wireless communication network comprising a. The method of claim 5,
If the data rate is less than a reference value when transmitting the divided data to the receiving group through the first frequency band, the communication unit is controlled to change the first frequency band to the second frequency band and transmit the divided data. Control unit
Transmitter for coverage expansion in a short-range wireless communication network further comprising. The method of claim 5,
A controller that searches for the target receiver by performing device discovery, and requests the target receiver to form a reception group with neighboring devices located in the receiving network
More,
And the target receiver is an apparatus for extending coverage in a short range wireless communication network forming the reception group with neighboring devices neighboring the target receiver. The method of claim 5,
And the first frequency band is a 60 GHz frequency band, and the second frequency band is a frequency band within 5 GHz. Forming a transmission group with peripheral devices capable of short range communication;
Distributing data to the peripheral devices for transmission to a target receiver;
Transmitting the distributed data to the peripheral devices through the frequency band for short-range communication; And
Transmitting the distributed data to a reception group to which the target receiver belongs by using a cooperative multiple input multiple output (MIMO) scheme with the peripheral devices;
Transmission method for coverage expansion in a local area wireless communication network comprising a. 10. The method of claim 9,
The transmitting of the received group may include transmitting the distributed data by using the frequency band for short-range communication. 10. The method of claim 9,
Before the forming step,
Requesting the target receiver to form the reception group
More,
The target receiver is a transmission method for coverage expansion in a short-range wireless communication network forming the receiving group with the neighboring devices neighboring the target receiver. 10. The method of claim 9,
And the frequency band is a 60GHZ frequency band. Distributing data to be transmitted to a target receiver to peripheral devices belonging to the same network;
Transmitting the distributed data to the peripheral devices through a first frequency band for near field communication; And
The target receiver belongs to the distributed data through a first frequency band for short range communication or a second frequency band for long range communication using a cooperative Multiple Input Multiple Output (MIMO) scheme with the peripheral devices. Steps to send to the receiving network
Transmission method for coverage expansion in a local area wireless communication network comprising a. The method of claim 13,
The step of transmitting to the receiving group,
A short-range wireless communication network that transmits the divided data by changing the first frequency band to the second frequency band when the data rate is equal to or less than a reference value when transmitting the divided data to the receiving group through the first frequency band. Transmission Method for Coverage Expansion in CDMA. The method of claim 13,
Prior to the dispensing step,
Performing a device discovery to discover the target receiver; And
Requesting the target receiver to form a reception group with neighboring devices located in the reception network
Transmission method for extending coverage in a short-range wireless communication network further comprising. The method of claim 13,
And the first frequency band is a 60 GHz frequency band and the second frequency band is a frequency band within 5 GHz. A communication unit for receiving data through a frequency band for short-range communication from neighboring neighboring devices; And
Decoder for collecting and decoding each data received from the neighboring devices
Including;
And each of the neighboring devices receives the data through a cooperative Multiple Input Multiple Output (MIMO) scheme from transmitting devices belonging to a transmitting group. The method of claim 17,
The neighboring devices perform MIMO detection on the received data to detect corresponding data and then transmit the detected data to the communication unit. The method of claim 17,
A group forming unit for forming a reception group with the neighboring neighboring devices at the request of an access point located in the transmission group or a source transmitter requesting data transmission.
Receiver for extending coverage in a short-range wireless communication network further comprising.

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