KR101392105B1 - Adaptive antenna beam forming method and multicast service providing method, data transmission apparatus - Google Patents

Abstract

An adaptive antenna beamforming method performed by a data transmission apparatus, comprising: selecting a reference device based on a distance between the data transmission apparatus and a plurality of devices; And determining an optimal beam width using a data rate based on the number of devices included in the beam formed based on the reference device and the beam width of the beam, .

Description

TECHNICAL FIELD [0001] The present invention relates to an adaptive antenna beam forming method and a multicast service providing method,

The following description relates to a method for providing a multicast service over a wireless network using a directional antenna, and more particularly, to a method for providing a multicast service by forming an adaptive beam in a device environment.

Korean Patent No. 0567469 discloses a method of controlling access to a medium for a smart wireless communication system in connection with a method for providing communication service on a conventional wireless network.

More specifically, the prior art includes a configuration for providing an omnidirectional antenna and a smart array antenna for beamforming, and a configuration for transmitting data frames through a predetermined frame through an omnidirectional antenna when transmission of a data frame is required.

The prior art has proposed a MAC scheme in which a smart antenna technology is applied to an IEEE 802.11 wireless LAN system and an omnidirectional antenna and a directional antenna are combined and communicated. In particular, the transmitter of the smart wireless communication system transmits a control frame such as RTS, CTS, and ACK, and a management frame such as beacon, authentication, subscription, and re-entry, and a multicast / broadcast data frame to the terminal through the omnidirectional antenna. On the other hand, when the transmitter transmits a unicast data frame, it uses a beam-forming directional antenna.

Specifically, a receiver of a smart wireless communication system uses only omnidirectional antennas at normal times, and when a receiver senses an arbitrary signal and identifies a CCA indicating whether the channel is idle or busy, the directional antenna is operated. When it is confirmed that the frame is transmitted by itself, the receiver continuously forms a reception beam and receives the frame until the end. On the other hand, if the frame is not directed to itself, the receiver stops operating the array antenna and selects a mode to operate only the omnidirectional antenna.

Further, in a technique of providing a multicast service using a fixed beam, the multicast service providing apparatus provides a multicast service regardless of the distance or position of the devices included in the fixed beam. At this time, since the multicast service providing apparatus does not consider the distance or position of devices, it selects a data rate that can include all devices for each beam. Therefore, in many cases, the multicast service providing apparatus provides a multicast service with a base rate at a lowest data rate as a data rate.

According to an exemplary embodiment, an adaptive antenna beam forming method includes: selecting a reference device based on a distance between a data transmission device and a plurality of devices; And determining an optimal beam width using a data rate according to the number of devices included in the beam formed based on the reference device and the beam width of the beam.

An adaptive antenna beam forming method according to an exemplary embodiment includes: setting devices included in a beam of the optimum beam width as a group; And the data transmission apparatus providing the multicast service to the devices included in the group.

The adaptive antenna beam forming method according to an exemplary embodiment may further include sequentially determining an optimum beam width so that all devices communicating with the data transmission device in a multicast manner are included in a beam formed by the data transmission device .

According to another embodiment, an adaptive antenna beam forming method includes: selecting a reference device based on a distance between a data transmission device and a plurality of devices; And sequentially determining an optimal beam width for the remaining devices excluding the devices included in the beam having the optimum beam width, when the optimal beam width is determined based on the reference device.

A method of providing a multicast service according to an exemplary embodiment of the present invention includes sequentially determining an optimal beam width using a distance between a data transmission apparatus and a plurality of devices, a number of devices included in the beam, and a data rate according to the beam width; And providing the multicast service to the devices included in the beam of the optimum beam width sequentially according to the optimal beam width.

According to an embodiment of the present invention, there is provided a data transmission apparatus comprising: a selection unit that selects a reference device based on a distance between a data transmission apparatus and a plurality of devices; And a determination unit for determining an optimum beam width using the number of devices included in the beam formed based on the reference device and the data rate according to the beam width of the beam.

A data transmission apparatus according to an exemplary embodiment of the present invention includes a setting unit configured to set devices included in a beam of the optimum beam width as a group; And a data transmission apparatus for providing a multicast service to devices included in the group.

1 is a diagram illustrating an overall configuration of a multicast service providing system according to an embodiment.
2 is a detailed block diagram of a data transmission apparatus according to an exemplary embodiment of the present invention.
3 is a diagram illustrating an example for calculating a distance between a data transmission apparatus and a plurality of devices according to an embodiment.
4 is a diagram illustrating an example of increasing a beam width around a reference device according to an exemplary embodiment.
5 is a diagram illustrating an example of determining an optimum beam width based on a reference device according to an embodiment.
6 is a diagram illustrating an example of setting devices included in an optimum beam width according to an embodiment as a group.
7 is a flow diagram illustrating an operation for providing a multicast service according to one embodiment.
8 is a flowchart illustrating an operation of sequentially providing multicast services to devices according to an exemplary embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. An adaptive antenna beamforming method according to an embodiment may be performed by a data transmission apparatus. In addition, a method of providing a multicast service according to an exemplary embodiment may be performed by a data transmission apparatus. Like reference symbols in the drawings denote like elements.

1 is a diagram illustrating an overall configuration of a multicast service providing system according to an embodiment.

Referring to FIG. 1, a multicast service providing system may include a data transmission apparatus 110 and a plurality of devices 120.

The data transmission apparatus 110 may transmit data to the plurality of devices 120 in a multicast manner using a directional antenna. That is, the data transmission apparatus 110 can transmit data to the plurality of devices 120 at the same time. In this case, the data transmission apparatus 110 can determine the optimum beamwidth necessary for performing communication by using the distance between the data transmission apparatus 110 and the plurality of devices 120, and directs the beam of the determined optimum beamwidth to the directivity It can be transmitted through an antenna.

In the process of determining the optimum beam width, the data transmission apparatus 110 may set the devices 120 included in the beam having the optimum beam width as a group. The data transmission apparatus 110 can transmit beams of the same beam width to the devices 120 belonging to the same group.

When the first optimal beam width is determined and thus the group of first devices 120 is set, the data transmission apparatus 110 transmits the second optimal beam width to the devices 120 that are not included in the beam of the first optimal beam width The beam width can be determined. The data transmission apparatus 110 can set the devices 120 included in the beam of the second optimum beam width to the second group and store or manage the setting information of the beam related to each group.

In other words, in providing the multicast service, the data transmission apparatus 110 can sequentially determine the optimal beam width for the plurality of devices 120, It is possible to sequentially provide the cast service. That is, the data transmission apparatus 110 performs optimal grouping for providing multicast service based on the location of the devices 120, the transmission rate, or the distance between the data transmission apparatus 110 and the devices 120. [ Method can be provided.

Accordingly, the data transmission apparatus 110 can provide a multicast service using a beam optimized for each group composed of the devices 120, maximize the efficiency in the data transmission interval, and improve the overall throughput have. In addition, the data transmission apparatus 110 can provide a multicast service at a maximum data rate that can be applied, not a base rate.

The data transmission apparatus 110 includes a base station (BS), an access point (AP), a radio access station (RAS), a node B, an evolved Node B a base station, an access point, a radio access station, a Node B, an eNodeB, a base transceiver station, a base transceiver station (MMR-BS), and the like may be referred to as an eNodeB, a base transceiver station And may include all or some of the functions of < RTI ID = 0.0 > Alternatively, the data transfer device 110 may include the functionality of the device 120, in which case the data transfer device 110 may receive data from another data transfer device 110.

The device 120 may receive a multicast service from a data communication device and may transmit data related to its location or communication environment to the data communication device.

Here, the device 120 includes a terminal, a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS) May refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some of functions of a terminal, a mobile terminal, a subscriber station, a mobile subscriber station, a user apparatus, . Alternatively, the device 120 may include the functionality of the data transmission device 110, in which case the device 120 may transmit data to the other device 120 in a multicast manner.

2 is a detailed block diagram of a data transmission apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the data transmission apparatus 210 may include a selection unit 220, a determination unit 230, a setting unit 240, and a data providing unit 250.

The selection unit 220 can select a reference device based on the distance between the data transmission device 210 and the plurality of devices.

The selection unit 220 can identify the location of a plurality of devices that are provided with multicast service centering on the data transmission device 210. The selection unit 220 can calculate the distance between the data transmission device 210 and the devices by identifying the location of the devices, and can select a reference device that is central to determining the optimum beam width.

The selection unit 220 can select a device that is the farthest from the data transmission device 210 as a reference device. When the first reference device is selected and the first optimal beam width corresponding thereto is determined, the selection unit 220 can select a second reference device for the devices not included in the beam of the first optimum beam width. In this case, the selection unit 220 can select a device that is the farthest from the data transmission device 210 among the devices not included in the beam of the first optimum beam width, as the second reference device. That is, the selection unit 220 can sequentially select reference devices.

The determining unit 230 may determine the optimum beam width using the number of devices included in the beam formed based on the reference device and the data rate according to the beam width of the beam. Specifically, the determining unit 230 may determine a beam width that maximizes a result of applying the data rate according to the number of devices included in the beam and the beam width of the beam as the optimum beam width.

The determining unit 230 may determine the optimum beam width while gradually increasing the beam width of the beam around the reference device. In this case, the determination unit 230 may increase the beam width continuously or discretely. For example, the determination unit 230 may increase the beam width continuously or discretely in increments of 10 degrees, starting at 10 degrees initially. According to another embodiment, the determination unit 230 may determine the optimum beam width while gradually decreasing the beam width, starting from the maximum beam width that can be output.

The determining unit 230 may increase the beam width of the beam to a quasi-omni directional width centered on the reference device. The quasi-omnidirectional directivity width can be defined as the maximum beam width that the beam pattern can have, when different directional beam patterns are formed over time, covering all directions. For example, the directional beam can generally have a beam width up to 180 degrees.

Alternatively, the determination unit 230 may increase the beam width to a beam width that satisfies a condition that a transmission distance of the data according to the beam width is larger than a distance between the data transmission apparatus 210 and the reference device, about the reference device. This is because the transmission distance of the data according to the beam width is larger than the distance between the data transmission device 210 and the reference device so that the data transmission device 210 can transmit data to the reference device. Accordingly, the determining unit 230 can determine the optimum beam width without increasing the beam width to a maximum value.

The determining unit 230 can identify the number of devices included in the beam while increasing the beam width and determine the optimum beam width using the data rate according to the number of identified devices and the beam width of the beam. For example, the determining unit 230 can identify the beam width that maximizes the product of the number of devices included in the beam and the data rate according to the beam width, and can determine the optimum beam width. Here, the data rate may be the largest data rate among the data rates satisfying the condition that the transmission distance of the data according to the beam width is greater than the distance between the data transmission device 210 and the reference device.

When the first optimal beam width is determined, the determining unit 230 may determine the second optimum beam width using the second reference device selected by the selecting unit 220. [ That is, the determining unit 230 can sequentially determine the optimum beam width.

The setting unit 240 may set the devices included in the beam having the optimum beam width as a group. That is, when the optimum beam width is determined, the setting unit 240 can set the devices included in the beam having the optimum beam width to one group or a plurality of groups.

The setting unit 240 may store or manage the profile information of the devices constituting each group or the communication environment information and beam setting information corresponding to each group. For example, the setting unit 240 may store or manage information related to locations of devices, network addresses, communication methods, or information related to beam widths, transmission speeds, and data transmission methods of beams corresponding to the respective groups.

When the first group is set, the setting unit 240 can set the second group based on the second optimum beam width determined by the determining unit 230. [ That is, the setting unit 240 can sequentially set the groups of devices for providing the multicast service.

The providing unit 250 may provide the multicast service to the devices included in the group set by the setting unit 240. [ The providing unit 250 may transmit data to the devices included in the group according to the beam width and transmission rate of the beam set for each group. The providing unit 250 may sequentially provide the multicast service for each group. That is, the providing unit 250 may sequentially provide the multicast service to each group through a beam of a beam width set according to each group in a wireless network environment using a directional antenna. Thus, the providing unit 250 can provide the multicast service for the devices located in all directions.

3 is a diagram illustrating an example for calculating a distance between a data transmission apparatus and a plurality of devices according to an embodiment.

Referring to FIG. 3, S 310 represents a data transmission apparatus and may be a reference point for distance calculation. A plurality of devices (D ₁ ~ D ₁₀ ).

The data transfer device can calculate the distance between the data transfer device and the devices by identifying the location of the devices to select the reference device. For example, the data transmission apparatus can calculate the distance between the data transmission apparatus and the devices using Equation (1).

(m)은 데이터 전송 장치와 디바이스 간의 거리일 수 있다. (

,

)는 데이터 전송 장치의 위치를 나타내는 좌표일 수 있고, (

,

)는 데이터 전송 장치 주변에 위치한 디바이스들의 위치를 나타내는 좌표일 수 있다. 수학식 1에서는 디바이스의 개수가 m 개인 경우를 나타내고 있다.Equation 1 can be defined as a formula for calculating the distance between a data transmission device and a device using Pythagorean theory.

(m) may be the distance between the data transmission device and the device. (

,

) May be a coordinate indicating the position of the data transmission apparatus, and (

,

) May be a coordinate indicating the location of the devices located around the data transmission device. Equation (1) shows a case where the number of devices is m.

The data transmission device calculates the distance between the data transmission device and the devices and selects the device with the greatest distance as the reference device. In Figure 3, since D ₂ 320 is the farthest away from the location 310 of the data transfer device, the data transfer device sends D ₂ 320 of the D ₁ to D ₁₀ devices to the reference device Can be selected.

4 is a diagram illustrating an example of increasing a beam width around a reference device according to an exemplary embodiment.

Referring to FIG. 4, the data transmission apparatus 410 may search for an optimum beam width while increasing the beam width 440 about the reference device 420 to determine an optimum beam width. The data transmission apparatus 410 may increase the beam width 440 around the line 430 including the data transmission apparatus 410 and the reference device 420 as a center axis. In this case, the data transmission apparatus 410 can increase the beam width 440 continuously or discrete. For example, the data transmission apparatus 410 may continuously search for the optimum beam width while continuously increasing the beam width 440 or increasing it by 10 degrees up to 180 degrees, starting at 10 degrees.

The data transmission apparatus 410 can search for an optimum beam width within a beam width range that satisfies a condition that a transmission distance of the data according to the beam width 440 is larger than a distance between the data transmission apparatus 410 and the reference device 420. [ This may be a condition for the data transmission device 410 to be able to communicate with the reference device 420 and a condition for preventing the inefficiency of searching for the optimum beam width to an unnecessary range.

5 is a diagram illustrating an example of determining an optimum beam width based on a reference device according to an embodiment.

Referring to FIG. 5, the data transmission device 510 may determine the optimal beam width while increasing the beam width 530 about the reference device 520 to determine the optimal beam width. In this case, the data transmission apparatus 510 can determine the optimum beam width using the number of devices included in the beam formed based on the reference device 520 and the data rate according to the beam width 530 of the beam.

Specifically, the data transmission apparatus 510 determines the beam width that maximizes the value to which the data rate according to the number of devices included in the beam formed based on the reference device 520 and the beam width 530 of the beam is applied, as the maximum beam width . For example, the data transmission apparatus 510 may use a Sum-Rate Maximization (SRM) scheme, which is a resource allocation scheme for maximizing the throughput of a system, to calculate a data rate The maximum beam width can be determined as the maximum beam width.

For example, the data transmission apparatus 510 can determine the maximum beamwidth using Equation (2).

는 기준 디바이스에 기초하여 형성된 빔에 포함되는 디바이스들의 개수일 수 있고,

(Mbps)는 빔의 빔폭

(도)(530)에 따른 데이터 레이트일 수 있다.

는

와

를 곱한 결과 값으로, 데이터 전송 장치(510)는 빔폭(530)을 점차 증가시키면서

값을 최대로 하는 빔폭(530)을 최적 빔폭으로 결정할 수 있다. 빔폭

(530)는

_min 에서

_max 사이의 값을 가질 수 있다.

_min(도) 는 지향성 안테나에서 송출할 수 있는 최소 빔폭일 수 있고,

_max(도)는 빔폭(530)에 따른 데이터의 전송 거리가 데이터 전송 장치(510)와 기준 디바이스(520)간의 거리보다 큰 조건을 만족시키는 빔폭일 수 있다.

(m) 는 데이터 전송 장치(510)와 기준 디바이스(510) 간의 거리일 수 있고,

(m) 는 빔폭

(530)에 따른 데이터의 전송 거리일 수 있다. 일례에 따르면,

는 IEEE 802.11ad 모델을 적용한 MCS(modulation and coding scheme) 파라미터로서, MCS 식별자(identifier)와 빔폭

(530)에 따른 데이터의 전송 거리일 수 있다.Equation (2) can be defined as a formula for determining the maximum beam width using SRM.

May be the number of devices included in the beam formed based on the reference device,

(Mbps) is the beam width of the beam

(530). ≪ / RTI >

The

Wow

, The data transmission apparatus 510 increases the beam width 530 gradually

The beam width 530 that maximizes the value can be determined as the optimum beam width. Beam width

(530)

_min

_max . < / RTI >

_min (degrees) may be the minimum beam width that can be emitted from the directional antenna,

_max may be a beam width that satisfies the condition that the transmission distance of the data according to the beam width 530 is larger than the distance between the data transmission device 510 and the reference device 520. [

(m) may be the distance between the data transmission device 510 and the reference device 510,

(m) is the beam width

Lt; RTI ID = 0.0 > 530. < / RTI > According to one example,

Is a modulation and coding scheme (MCS) parameter to which the IEEE 802.11ad model is applied. The MCS identifier and the beam width

Lt; RTI ID = 0.0 > 530. < / RTI >

Hereinafter, an example in which the data transmission apparatus finds the optimum beam width using Equation (2) and the MCS parameter will be described.

) 간의 관계로서, 지향성 안테나의 빔폭에 따른 데이터의 전송 거리가 기재되어 있다.In the case of IEEE 802.11ad, there may be 27 MCS identifiers, and the corresponding data rate may be defined. Table 1 below shows the MCS parameters to which the IEEE 802.11ad model is applied. Specifically, Table 1 shows a data rate, a beamwidth, and a transmission distance of data according to the MCS identifier

, The transmission distance of data according to the beam width of the directional antenna is described.

In Table 1, the larger the data rate, the shorter the data transmission distance and the shorter the data transmission distance as the beam width increases at the same data rate.

와

가 적용된 결과를 계산할 수 있다. 여기서,

는 빔폭(530)이 10도일 때의 데이터 레이트 중 가장 큰 데이터 레이트일 수 있고, 데이터 전송 장치(510)와 기준 디바이스(520) 간의 거리인 12m보다 큰 데이터의 전송 거리를 지원하는 데이터 레이트일 수 있다.Assuming that the distance between the data transmission device 510 and the reference device 520 is 12 m, the data transmission device 510 transmits a beam of 10 degrees with an initial beam width,

Wow

Can be calculated. here,

May be the largest data rate of the data rate when the beam width 530 is 10 degrees and may be the data rate that supports the transmission distance of data larger than 12 meters, which is the distance between the data transmission device 510 and the reference device 520 have.

는 빔폭(530)이 30도인 빔에 포함되는 디바이스들의 개수를 나타낼 수 있고,

는 3465Mbps가 될 수 있다.

가 4158Mbps이고, 빔폭이 30도인 빔은 데이터의 전송 거리로 9.4350m를 지원하므로, 이 경우 데이터 전송 장치(510)는 기준 디바이스(520)에 데이터를 정상적으로 송신할 수 없다. 따라서, 데이터 전송 장치(510)는 일정 빔폭(530)에서 데이터 전송 장치(510)와 기준 디바이스(520) 간의 거리인 12m 보다 큰 데이터의 전송 거리를 지원하는 데이터 레이트 중

값을 최대화하는 3456Mbps의 데이터 레이트를 선택하게 되는 것이다.For example, if the beam width 530 is 30 degrees,

May represent the number of devices included in the beam having a beam width 530 of 30 degrees,

May be 3465 Mbps.

A beam having a beam width of 30 degrees corresponds to a transmission distance of 9.4350 m. In this case, the data transmission apparatus 510 can not transmit data to the reference device 520 normally. Accordingly, the data transmission apparatus 510 transmits data at a constant beam width 530 at a data rate that supports a transmission distance of data larger than 12 m, which is a distance between the data transmission apparatus 510 and the reference device 520

The data rate of 3456 Mbps which maximizes the value is selected.

와

가 적용된 결과 값을 가장 크게 하는 빔폭을 최적 빔폭으로 결정할 수 있다. 결론적으로, 데이터 전송 장치(510)는 고정된 빔이 아닌 디바이스들의 위치에 따라 적응적으로 결정된 빔폭의 빔을 이용하여 최적의 멀티캐스트 서비스 환경을 제공할 수 있다.Through the above process, the data transfer apparatus 510

Wow

The optimum beam width can be determined as the beam width that maximizes the resultant value. As a result, the data transmission apparatus 510 can provide an optimum multicast service environment using a beam of a beam width adaptively determined according to the location of the devices, rather than the fixed beam.

According to another embodiment, the data transmission apparatus 510 can determine 30 degrees with a beam width supporting a data rate of 2772 Mbps and a data transmission distance of 16 m or more. This is because the beam width supporting the data transmission distance of 16 m or more is 10 degrees, 20 degrees, 30 degrees at 2772 Mbps, but a beam having a beam width of 30 degrees may include a larger number of devices.

The data transmission apparatus 510 can select the second reference device 540 for the devices not included in the beam of the first optimum beam width when the first optimal beam width 530 is determined. Specifically, when the first optimum beam width 530 is determined, the data transmission apparatus 510 can select the farthest device 540 among the devices not included in the beam of the first optimum beam width, as the reference device. The data transmission apparatus 510 can search for the second optimum beam width through the same process as above with the second reference device 540 as the center. In this manner, the data transmission apparatus 510 can sequentially determine an optimal beam width for a plurality of devices.

6 is a diagram illustrating an example of setting devices included in an optimum beam width according to an embodiment as a group.

Referring to FIG. 6, when the data transmission apparatus 610 determines the first optimal beam width 660 around the first reference device 640, the second reference device 650 is selected and the second reference device 650 The second optimal beam width 670 can be determined.

Specifically, when the first optimal beam width 660 is determined, the data transmission device 610 transmits the first optimal beam width 660 to the device 620 at the farthest distance among the remaining devices except for the devices included in the beam 620 of the first optimal beam width 660 650) can be selected as the second reference device. When the second reference device 650 is selected, the data transmission apparatus 610 increases the beam width 670 based on the second reference device 650, and increases the data rate 630 according to the number of devices included in the beam and the beam width of the beam The beam width can be searched to maximize the result of applying the beam. That is, the data transmission apparatus 610 can sequentially determine an optimum beam width for all the devices.

The data transmission apparatus 610 can set the devices included in the beams 620 and 630 of the optimal beam widths 660 and 670 as a group and sequentially provide the multicast service to each group. 6, D ₁ , D ₂ , and D ₃ are included in the beam 620 of the first optimal beam width 660 and the data transmission device 610 receives D ₁ , D ₂ , and D ₃ in the same multicast service environment Lt; RTI ID = 0.0 > ₃ < / RTI > In addition, the data transmission apparatus 610 may store setting information of a beam to be sent to each group, and when the devices included in each group are changed, the data transmission apparatus 610 may perform the operation for determining the optimum beam width again.

7 is a flow diagram illustrating an operation for providing a multicast service according to one embodiment.

In step S710, the data transfer device can select the reference device based on the distance between the data transfer device and the plurality of devices. Specifically, the data transfer device can select the device that is the farthest from the data transfer device as the reference device.

In step S720, the data transmission apparatus can determine the optimum beam width using the data rate according to the number of devices included in the beam formed based on the reference device and the beam width of the beam. Specifically, the data transmission apparatus can determine the optimum beam width as the beam width that maximizes the result of applying the data rate according to the number of devices included in the beam and the beam width of the beam.

Here, the data rate according to the beam width may be the largest data rate among the data rates satisfying the condition that the transmission distance of the data according to the beam width is larger than the distance between the data transmission device and the reference device.

Alternatively, the data transmission apparatus may sequentially determine an optimum beam width so that all devices communicating with the data transmission apparatus in a multicast manner are included in the beam formed by the data transmission apparatus. In other words, if the optimal beam width is determined based on the reference device, the data transmission apparatus can sequentially determine the optimal beam width for the remaining devices except the device included in the beam having the optimum beam width.

In this case, the data transmission apparatus can determine the optimum beam width while increasing the beam width to the quasi-omni-directional width around the reference device. Alternatively, the data transmission apparatus may determine the optimum beam width while increasing the beam width to a beam width that satisfies a condition that a transmission distance of data according to the beam width is larger than a distance between the data transmission apparatus and the reference device, about the reference device.

In step S730, the data transmission apparatus can group the devices included in the beam of the optimum beam width. When the optimal beam width is determined, the data transfer apparatus can set the devices included in the beam having the optimum beam width to one group or a plurality of groups, and can store or manage beam setting information corresponding to each group. In addition, the data transmission device may sequentially set up a group of devices for providing a multicast service.

In step S740, the data transmission device may provide the multicast service to the devices included in the group. The data transmission apparatus can transmit data to the devices included in the group according to the beam width and transmission rate set for each group, and can sequentially provide the multicast service for each group

8 is a flowchart illustrating an operation of sequentially providing multicast services to devices according to an exemplary embodiment.

In step S810, the data transmission apparatus may sequentially determine an optimum beam width using a distance between the data transmission apparatus and the plurality of devices, a number of devices included in the beam, and a data rate according to the beam width. Specifically, the data transfer apparatus maximizes the result of applying the data rate according to the number of devices included in the beam and the beam width of the beam, based on the reference device selected based on the distance between the data transfer apparatus and the plurality of devices The beam width can be sequentially determined.

In step S820, the data transmission apparatus can sequentially provide the multicast service to the devices included in the beam of the optimum beam width according to the determined optimal beam width. The data transmission apparatus can sequentially transmit data to the group according to the beam width and transmission rate of the beam set for each group.

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.

210: Data transmission device
220:
230:
240: Setting section
250: Offering

Claims (16)

An adaptive antenna beamforming method performed by a data transmission apparatus,
Selecting a reference device based on a distance between the data transmission device and a plurality of devices; And
Determining an optimal beam width using a data rate according to the number of devices included in a beam formed based on the reference device and a beam width of the beam,
Wherein determining the optimal beam width comprises:
Changing a beam width of the beam based on the reference device; And
Determining a beam width that maximizes a result of applying the data rate according to the number of devices included in the beam of the beam width and the beam width to an optimum beam width
/ RTI > The method of claim 1, delete The method according to claim 1,
Setting the devices included in the beam of the optimum beam width as a group; And
Wherein the data transmission device provides a multicast service to devices included in the group
≪ / RTI > The method according to claim 1,
Sequentially determining an optimal beam width so that all devices communicating with the data transmission device in a multicast manner are included in the beam formed by the data transmission device
≪ / RTI > The method according to claim 1,
Wherein the step of selecting the reference device comprises:
And selecting a device that is the farthest from the data transmission device as a reference device. The method according to claim 1,
Wherein determining the optimal beam width comprises:
Wherein the optimal beam width is determined while increasing the beam width to a quasi-omni directional width about the reference device. The method according to claim 1,
Wherein determining the optimal beam width comprises:
Wherein the optimum beam width is determined while increasing a beam width to a beam width satisfying a condition that a transmission distance of data according to a beam width is larger than a distance between the data transmission device and the reference device about the reference device. The method according to claim 1,
The data rate according to the beam width,
Wherein the maximum data rate satisfies a condition that a transmission distance of the data according to the beam width is larger than a distance between the data transmission device and the reference device. The method according to claim 1,
The data transmission apparatus includes:
An adaptive antenna beamforming method for transmitting data in a multicast manner to a plurality of devices using a directional antenna. An adaptive antenna beamforming method performed by a data transmission apparatus,
Selecting a reference device based on a distance between the data transmission device and a plurality of devices;
Determining an optimal beam width based on the reference device; And
And sequentially determining an optimum beam width for the remaining devices excluding the device included in the beam having the optimum beam width,
Wherein determining the optimal beam width comprises:
Changing a beam width of the beam based on the reference device; And
Determining a beam width that maximizes a result of applying the data rate according to the number of devices included in the beam of the beam width and the beam width to an optimum beam width
/ RTI > The method of claim 1, delete A method for providing a multicast service performed by a data transmission apparatus,
Sequentially determining an optimal beam width using a distance between the data transmission apparatus and a plurality of devices, a number of devices included in the beam, and a data rate according to the beam width; And
And sequentially providing multicast services to devices included in the beam having the optimum beam width according to the optimum beam width,
Wherein the step of sequentially determining the optimal beam width comprises:
Selecting a reference device based on a distance between the data transmission device and a plurality of devices;
Changing a beam width of the beam based on the reference device; And
Determining a beam width that maximizes a result of applying the data rate according to the number of devices included in the beam of the beam width and the beam width to an optimum beam width
The multicast service providing method comprising: delete A computer-readable recording medium having recorded thereon a program for executing the method according to any one of claims 1, 3 to 10, and 12. A selection unit for selecting a reference device based on a distance between the data transmission device and the plurality of devices; And
And a determination unit for determining an optimum beam width using a data rate according to the number of devices included in the beam formed based on the reference device and the beam width of the beam,
Wherein,
And determines a beam width that maximizes a result of applying a data rate according to the number of devices included in the beam of the beam width and the beam width as an optimum beam width. 16. The method of claim 15,
A setting unit configured to set the devices included in the beam having the optimum beam width as a group; And
Wherein the data transmission apparatus provides a multicast service to devices included in the group,
Further comprising:

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