WO2020067655A1

WO2020067655A1 - Device and method for selecting multi-hop improvement path of wi-fi cooperative communication relay

Info

Publication number: WO2020067655A1
Application number: PCT/KR2019/011536
Authority: WO
Inventors: 김완수
Original assignee: 넥서스텍(주)
Priority date: 2018-09-28
Filing date: 2019-09-06
Publication date: 2020-04-02
Also published as: KR102024756B1

Abstract

The present invention relates to a device and method for selecting a multi-hop improvement path of a Wi-Fi cooperative communication relay, in which routing is possible in consideration of a transmission efficiency of a relay, and data required by a terminal is divided and provided by the relay. According to the present invention, a device for selecting a multi-hop improvement path of a Wi-Fi cooperative communication relay comprises: a first relay AP for transmitting or receiving data with a network; a second relay AP for transmitting or receiving data via the first relay AP; and a terminal for transmitting or receiving data via at least one of the first relay AP and the second relay AP.

Description

Device and method for multi-hop improvement route selection of Wi-Fi cooperative communication relay

The present invention relates to a multi-hop improvement route selection device and method of a Wi-Fi cooperative communication relay, and in detail, to select a relay route to satisfy a required transmission rate of a terminal. That is, the present invention relates to an apparatus and method for selecting a multi-hop improvement path of a Wi-Fi cooperative communication relay that can optimally utilize network efficiency by selecting a relay path for improving multi-hop performance.

Recently, in the wireless communication field, a repeater or relay is installed for data service in a terminal in a shaded area. However, in the case of relay, since the data transmission rate decreases as it goes through multiple hops, a cooperative communication technique for obtaining spatial diversity gain has been proposed.

According to the cooperative communication technique, several nodes can virtually share the antennas of other nodes, so that spatial diversity gain can be obtained.

In a cooperative communication system, relay nodes play a very important role. The relay node processes the source signal transmitted from the source node according to an amplify and forward technique or a decode and forward technique, and generates a relay signal. Then, the relay node transmits the generated relay signal to the target node.

At this time, there is a limit to the data transmission rate that can be achieved by the cooperative communication system. Therefore, research on the optimization of the function of the relay node and the target node in the cooperative communication system has been continued.

As an example, Korean Patent Publication No. 10-2009-0085494 receives a source signal transmitted from a source node to generate a first relay signal from which the source signal is decoded and a second relay signal from which the power of the source signal is amplified. We proposed a relay node that can be simultaneously transmitted to the target node to correct errors.

However, even in this case, since the transmission efficiency of multiple relays is not considered, the overall network transmission rate is deteriorated.

An object of the present invention is to provide a multi-hop improvement route selection apparatus and method for a routable Wi-Fi cooperative communication relay in consideration of transmission efficiency of a relay so that Wi-Fi multi-hop can be improved.

Another object of the present invention is to provide a multi-hop improvement path selection device and method for a Wi-Fi cooperative communication relay that provides data required by a terminal in a relay.

The multi-hop improvement route selection device of the Wi-Fi cooperative communication relay according to the present invention includes a first relay AP transmitting and receiving data with a network, a second relay AP transmitting and receiving data through the first relay AP, and a first relay AP or a second relay AP. It may include a terminal for transmitting and receiving data through at least one of the relay AP.

Here, the terminal may preferentially transmit and receive data from the first relay AP when the 'reception level (Rx1) of the first relay AP-the reception level (Rx2) of the second relay AP' measured by the terminal is greater than or equal to the upper limit.

In addition, the terminal may preferentially transmit / receive data from the second relay AP when the 'reception level (Rx1) of the first relay AP-reception level (Rx2) of the second relay AP' measured by the terminal is less than or equal to the lower limit.

Here, if the 'reception level (Rx1) of the first relay AP-reception level (Rx2) of the second relay AP' measured by the terminal is less than or equal to the upper limit value or higher than the lower limit value, the transmission rate of the first relay AP transmitting and receiving to the network is minimum. In order to be, the first relay AP or the second relay AP may preferentially transmit and receive data.

In addition, the transmission rate of the first relay AP may be calculated based on the reception level and channel bandwidth of the first relay AP received from the terminal.

Here, the transmission rate of the first relay AP may be calculated based on the reception level and channel bandwidth of the first relay AP received from the second relay AP.

In addition, the transmission rate of the first relay AP may be calculated based on the reception level and channel bandwidth of the second relay AP received from the terminal.

Here, when the first relay AP transmits / receives data preferentially, only when the 'reception level (Rx1) of the first relay AP-reception level (Rx2) of the second relay AP' measured by the terminal is changed below the lower limit value Data can be preferentially transmitted and received from the second relay AP.

In addition, when the second relay AP preferentially transmits / receives data, it is only when the 'reception level (Rx1) of the first relay AP-reception level (Rx2) of the second relay AP' measured by the terminal is changed to an upper limit value or higher. Data can be preferentially transmitted and received from the first relay AP.

Here, the terminal may perform cooperative communication based on at least one of time separation, frequency separation, and spatial separation with the first relay AP or the second relay AP.

In addition, the terminal may include at least one of time separation including different time arrangements within a frame, or different subcarriers, different subchannels, and frequency separation including different channels.

Meanwhile, the terminal may include spatial diversity, pattern diversity, spatial separation including any one of multi input multi output (MIMO), and Alamouti.

According to another embodiment of the present invention, a multi-hop improvement route selection method of a Wi-Fi cooperative communication relay comprises: a reception level measurement step of measuring data reception levels of a first relay AP and a second relay AP at a terminal, a first relay AP at a terminal, or The main service AP selection step of selecting any one of the second relay APs as the main service AP, the maximum transmission rate exceeding confirmation step of checking whether the transmission rate required by the terminal exceeds the maximum transmission rate of the main service AP, and when the maximum transmission rate is exceeded A cooperative communication step of performing cooperative communication with the main service AP by receiving the insufficient transmission rate of the transmission rate required by the terminal and the maximum transmission rate of the main service AP as an AP not selected as the main service AP among the first relay AP or the second relay AP. It may include.

Here, when the first relay AP is selected as the main service AP in the main service AP selection step, the first relay AP transmission signal reception level (Rx1) measurement step of measuring the reception level (Rx1) of the first relay AP transmission signal, The second relay AP transmission signal reception level (Rx2) measurement step of measuring the reception level (Rx2) of the second relay AP transmission signal, the (Rx1-Rx2) exceeding the upper limit value confirmation step of checking whether the (Rx1-Rx2) is greater than the upper limit value , In the step of checking the upper limit of (Rx1-Rx2), if (Rx1-Rx2) is greater than the upper limit, the first relay AP service step of selecting the first relay AP as the main service AP, the data requested by the terminal is the first relay In the first relay AP maximum transmission rate exceeding confirmation step for checking whether the maximum transmission rate of the AP is exceeded, and in the first relay AP maximum transmission rate exceeding confirmation step, when the maximum transmission rate is exceeded, the transmission rate and the first required by the terminal It may include a cooperative communication step of receiving the insufficient transmission rate of the maximum transmission rate of the relay AP from the second relay AP and performing cooperative communication with the terminal together with the first relay AP.

In addition, when the second relay AP is selected as the main service AP in the main service AP selection step, the first relay AP transmission signal reception level (Rx1) measurement step of measuring the reception level (Rx1) of the first relay AP transmission signal, The second relay AP transmission signal reception level (Rx2) measurement step of measuring the reception level (Rx2) of the second relay AP transmission signal, confirming that the lower limit value of (Rx1-Rx2) is lower than the (Rx1-Rx2) is lower than the lower limit value Step, in the step of confirming that the lower limit value of (Rx1-Rx2) is not reached, the second relay AP service step of selecting the second relay AP as the main service AP when (Rx1-Rx2) is less than the lower limit value, and the data requested by the terminal is the second. In the second relay AP maximum transmission rate exceeding confirmation step for checking whether the maximum transmission rate of the relay AP is exceeded, and in the second relay AP maximum transmission rate exceeding confirmation step, if the maximum transmission rate is exceeded, the transmission rate and the request required by the terminal The second relay AP may include a cooperative communication step of receiving the insufficient transmission rate of the maximum transmission rate from the first relay AP and performing cooperative communication with the terminal together with the second relay AP.

Here, in the main service AP selection step, when one of the first relay AP or the second relay AP is selected and used as the main service AP, the first relay AP measures the reception level (Rx1) of the first relay AP transmission signal. Measurement level of the transmission signal reception level (Rx1), measurement level of the second relay AP transmission signal reception level (Rx2) for measuring the reception level (Rx2) of the second relay AP transmission signal, (Rx1-Rx2) is equal to or lower than the upper limit value and higher than the lower limit value In the checking step below the upper and lower limit values of (Rx1-Rx2), and checking the upper and lower limits of (Rx1-Rx2) and checking the lower limit or higher in (Rx1-Rx2), the first relay AP Selecting a main service AP to transmit / receive data to / from a terminal by selecting either the first relay AP or the second relay AP as the main service AP so that the transmission rate is the minimum, and the data service step. In the step of confirming the maximum data rate exceeding the maximum data rate of the main service AP, and in the step of confirming the maximum data rate exceeding the main service AP, if the requested data exceeds the maximum data rate of the main service AP, It may include a cooperative communication step of receiving the insufficient transmission rate of the maximum transmission rate of the main service AP as an AP not selected as the main service AP among the first relay AP or the second relay AP to perform cooperative communication with the main service AP.

The multi-hop improvement route selection apparatus and method of the Wi-Fi cooperative communication relay according to the present invention has the advantage of being capable of routing in consideration of the transmission efficiency of the relay so that the Wi-Fi multi-hop can be improved.

In addition, the multi-hop improvement route selection device and method of the Wi-Fi cooperative communication relay according to the present invention has an advantage of providing data required by the terminal in a relay.

1 is a block diagram showing a multi-hop improvement path selection device of a Wi-Fi cooperative communication relay according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration in which the terminal of FIG. 1 uses the first relay AP as a main service AP.

3 is a configuration diagram illustrating a case in which the terminal of FIG. 1 uses the second relay AP as a main service AP.

4 is a configuration diagram illustrating a case in which the terminal of FIG. 1 selects and uses either the first relay AP or the second relay AP as a main service AP.

5 is a configuration diagram illustrating a case in which the terminal of FIG. 1 receives radio signals of the first relay AP and the second relay AP through the same antenna.

6 is a configuration diagram illustrating a case in which the terminal of FIG. 1 receives radio signals of the first relay AP and the second relay AP through different antennas.

7 is a flowchart illustrating a multi-hop improvement route selection method of a Wi-Fi cooperative communication relay according to an embodiment of the present invention.

8 is a flowchart illustrating a case in which the first relay AP is used as the main service AP in the main service AP selection step of FIG. 7.

9 is a flowchart illustrating a case in which the second relay AP is used as the main service AP in the main service AP selection step of FIG. 7.

10 is a flowchart illustrating a case in which either the first relay AP or the second relay AP is selected and used as the main service AP in the main service AP selection step of FIG. 7.

A specific embodiment for carrying out the present invention will be described with reference to the accompanying drawings.

The present invention can be applied to various changes and may have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and can be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Hereinafter, a multi-hop improvement route selection apparatus and method of a Wi-Fi cooperative communication relay according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an apparatus for selecting a multi-hop improvement route of a Wi-Fi cooperative communication relay according to an embodiment of the present invention, and FIGS. 2 to 6 are detailed configuration diagrams for describing FIG. 1 in detail.

Hereinafter, a multi-hop improvement path selection device of a Wi-Fi cooperative communication relay according to an embodiment of the present invention may be described with reference to FIGS. 1 to 6.

First, referring to FIG. 1, a multi-hop improvement route selection device of a Wi-Fi cooperative communication relay according to an embodiment of the present invention includes a first relay AP 200 and a first relay AP (transmitting and receiving data) with the network 100. It consists of a second relay AP 300 for transmitting and receiving data through 200), and a terminal 400 for transmitting and receiving data through at least one of the first relay AP 200 or the second relay AP 300.

Here, the terminal 400 may perform cooperative communication based on at least one of time separation, frequency separation, and spatial separation with the first relay AP 200 or the second relay AP 300.

That is, the first relay AP 200 and the second relay AP 300 may be connected to a relay to provide data service to the terminal 400 in a shaded area. At this time, in general, the terminal 400 may be serviced by either the first relay AP 200 or the second relay AP 300. However, when the data capacity required by the terminal 400 is large or exceeds the maximum transmission rate that can be provided from the first relay AP 200 or the second relay AP 300 to the terminal 400, the first relay AP ( 200) and the second relay AP 300, it is necessary to perform cooperative communication with the terminal 400.

2 to 4 are diagrams including a configuration diagram for a case where one of the first relay AP 200 or the second relay AP 300 is used as the main service AP, and FIGS. 5 to 6 are first The relay AP 200 or the second relay AP 300 is described, including the connection of the antenna to the case where the terminal 400 performs cooperative communication based on one of time separation, frequency separation, and spatial separation.

FIG. 2 is a configuration diagram illustrating a case in which the terminal 400 of FIG. 1 uses the first relay AP 200 as a main service AP.

As can be seen in FIG. 2, the terminal 400 measures the reception level (Rx1) of the first relay AP 200-the reception level (Rx2) of the second relay AP 300 measured by the terminal 400. If it is greater than or equal to this upper limit, data can be preferentially transmitted and received from the first relay AP 200.

That is, when the first relay AP 200 is used as the main service AP, the data transmission efficiency between the network 100 and the first relay AP 200 is higher than that of using the second relay AP 300 as the main service AP. Since this is high, there is an advantage of improving the overall network efficiency.

3 is a configuration diagram illustrating a case in which the terminal 400 of FIG. 1 uses the second relay AP 300 as a main service AP.

As can be seen in FIG. 3, the terminal 400 measures the reception level (Rx1) of the first relay AP 200-the reception level (Rx2) of the second relay AP 300 measured by the terminal 400. If it is less than this lower limit, data can be preferentially transmitted and received from the second relay AP 300.

That is, when the second relay AP 300 is used as the main service AP, data transmission efficiency between the network 100 and the first relay AP 200 is higher than that of using the first relay AP 200 as the main service AP. Since this is high, there is an advantage of improving the overall network efficiency.

4 is a configuration diagram illustrating a case in which the terminal 400 of FIG. 1 selects and uses either the first relay AP 200 or the second relay AP 300 as a main service AP.

As can be seen in FIG. 4, the terminal 400 measures the reception level (Rx1) of the first relay AP 200-the reception level (Rx2) of the second relay AP 300 measured by the terminal 400. If it is below the upper limit and above the lower limit, data is preferentially received from either the first relay AP 200 or the second relay AP 300 so that the transmission rate of the first relay AP 200 transmitting and receiving to and from the network 100 is minimum. It can transmit and receive.

In addition, the transmission rate of the first relay AP 200 may be calculated based on the reception level and channel bandwidth of the first relay AP 200 received from the terminal 400.

Here, the transmission rate of the first relay AP 200 may be calculated based on the reception level and channel bandwidth of the first relay AP 200 received from the second relay AP 300.

In addition, the transmission rate of the first relay AP 200 may be calculated based on the reception level and channel bandwidth of the second relay AP 300 received from the terminal 400.

Here, when the first relay AP 200 preferentially transmits / receives data, the reception level (Rx1) of the first relay AP 200 measured by the terminal 400-the reception level of the second relay AP 300 Only when (Rx2) 'is changed below the lower limit value, data can be preferentially transmitted and received from the second relay AP 300.

In addition, when the second relay AP 300 preferentially transmits and receives data, the reception level of the first relay AP 200 (Rx1)-the reception level of the second relay AP 300 measured by the terminal 400 Only when (Rx2) 'is changed to an upper limit or higher, data can be preferentially transmitted and received from the first relay AP 200.

That is, if the 'reception level (Rx1) of the first relay AP 200-the reception level (Rx2) of the second relay AP 300' 'measured by the terminal 400 is less than or equal to the upper limit value and greater than or equal to the lower limit value, the network 100 By selecting the first relay AP 200 or the second relay AP 300 having high data transmission efficiency with and the first relay AP 200, it is possible to increase the overall network efficiency.

At this time, the data transmission rate between the network 100 and the first relay AP 200 is received by the first relay AP 200 received from the terminal 400 when the terminal 400 transmits and receives data to and from the first relay AP 200. It can be calculated based on the level and channel bandwidth. That is, the higher the reception level of the first relay AP 200, the higher the modulation method can be used, so when using the same bandwidth, the data capacity that can be transmitted and received with the terminal 400 can be increased, and the network 100 and Data transmission efficiency with the first relay AP 200 may also be increased.

Meanwhile, when the terminal 400 transmits and receives the second relay AP 300, it may be calculated based on the reception level and channel bandwidth of the second relay AP 300 received from the terminal 400, as in the case above. In addition, the reception level and channel bandwidth of the first relay AP 200 received from the second relay AP 300 may also be calculated at the same time.

Accordingly, when the data transmission rate of the network 100 and the first relay AP 200 is calculated, the terminal 400 transmits and receives data through the first relay AP 200 and the terminal 400 receives the second relay AP 300. ), The data transmission and reception through the first relay AP 200 and the second relay AP 300 through one hop are considered simultaneously. There is a need.

That is, even when the terminal 400 is capable of wireless transmission and reception for the first relay AP 200 or the second relay AP 300, the main service having high data transmission efficiency between the network 100 and the first relay AP 200 By selecting an AP, there is an advantage of increasing the overall network efficiency.

5 is a configuration diagram illustrating a case in which the terminal 400 of FIG. 1 receives radio signals of the first relay AP 200 and the second relay AP 300 through the same antenna.

As can be seen in FIG. 5, the terminal 400 may include at least one of time separation or different subcarriers, different subchannels, and frequency separation including different channels.

That is, the wireless transmission / reception signals of the first relay AP 200 and the second relay AP 300 can be simultaneously received by the antenna of the terminal 400. At this time, the separation of the two signals must be time-separated or frequency-separated. do.

Here, by separating the time between the data time in which the first relay AP 200 is located and the data time in which the second relay AP 300 is located within one frame, time separation can be performed in the terminal 400. Indicates.

In addition, frequency separation uses a subcarrier within Orthogonal Frequency Domain Modulation (OFDM) in addition to using different frequencies, uses a subchannel divided into groups among one channel, or uses different channels among multiple channels. It may include, and by transmitting and receiving data of the first relay AP 200 and the second relay AP 300 at the same time by separating the frequency, there is an advantage to increase the overall network efficiency.

6 is a configuration diagram illustrating a case in which the terminal 400 of FIG. 1 receives radio signals of the first relay AP 200 and the second relay AP 300 through different antennas.

As can be seen in FIG. 6, the terminal 400 may include spatial diversity including spatial diversity, pattern diversity, multi input multi output (MIMO), and Alamouti.

That is, when the terminal 400 can spatially separate and transmit and receive data for the signals of the first relay AP 200 and the second relay AP 300, the frequencies are transmitted by using the same frequency at the same time. There is an advantage to increase the efficiency.

At this time, the spatial separation is characterized by spatial diversity that can separate antennas or use polarization differently, pattern diversity that uses different antenna patterns, and MIMO that separates various reflection paths spatially reflected for multiple antennas. , And it has the advantage of increasing the overall network efficiency by using at least one of the Alamouti method that the antenna of the multiple relays can perform a MIMO role for one terminal 400.

7 is a flowchart illustrating a multi-hop improvement route selection method of a Wi-Fi cooperative communication relay according to an embodiment of the present invention, and FIGS. 8 to 10 are detailed flowcharts for describing FIG. 7 in detail.

Hereinafter, a multi-hop improvement route selection method of a Wi-Fi cooperative communication relay according to another embodiment of the present invention will be described with reference to FIGS. 7 to 10.

First, referring to FIG. 7, a method for selecting a multi-hop improvement route of a Wi-Fi cooperative communication relay according to another embodiment of the present invention includes data of the first relay AP 200 and the second relay AP 300 in the terminal 400 In step (S100) of measuring the reception level, in step (S200) of selecting either the first relay AP 200 or the second relay AP 300 as the main service AP in the terminal 400 (S200), the terminal 400 The first relay AP determines whether the requested transmission rate exceeds the maximum transmission rate of the main service AP (S300), and when the maximum transmission rate is exceeded, the insufficient transmission rate between the transmission rate required by the terminal 400 and the maximum transmission rate of the main service AP. It is provided as an AP that is not selected as the main service AP among the 200 or the second relay AP 300 and performs a cooperative communication with the main service AP (S400).

At this time, in the main service AP selection step (S200), the main service AP may be selected according to the reception level of the first relay AP 200 and the reception level of the second relay AP 300 received by the terminal 400, Accordingly, by increasing the transmission efficiency between the network 100 and the first relay AP 200, there is an advantage to increase the transmission efficiency of the entire network.

8 is a flowchart illustrating a case in which the first relay AP 200 is used as the main service AP in the main service AP selection step S200 of FIG. 7.

As shown in FIG. 8, when the first relay AP 200 is selected as the main service AP in the main service AP selection step (S200), the reception level Rx1 of the transmission signal of the first relay AP 200 is determined. Measuring step (S110), the second relay AP (300) measuring the reception level (Rx2) of the transmission signal (S120), (Rx1-Rx2) is greater than the upper limit (S130), (Rx1-Rx2) In step (S130) of exceeding the upper limit of (), when (Rx1-Rx2) is greater than the upper limit, selecting the first relay AP 200 as the main service AP (S140), the data requested by the terminal 400 is removed. In the step (S150) of checking whether the maximum transmission rate of the 1 relay AP 200 is exceeded, and in the step (S150) of the first relay AP exceeding the maximum transmission rate, when the maximum transmission rate is exceeded, the transmission rate required by the terminal 400 and The first relay receives the insufficient transmission rate of the maximum transmission rate of the first relay AP 200 from the second relay AP 300 It may include a step (S160) for performing cooperative communication with terminal 400 with the AP (200).

That is, when the terminal 400 is located close to the first relay AP 200, when the first relay AP 200 is used as the main service AP and the maximum capacity provided by the main service AP is exceeded, the insufficient transmission rate is second. By providing through the relay AP 300, there is an advantage of increasing the data transmission efficiency between the network 100 and the first relay AP 200, and increasing the transmission efficiency of the entire network.

9 is a flowchart illustrating a case in which the second relay AP 300 is used as a main service AP in the main service AP selection step (S200) of FIG. 7.

As can be seen in FIG. 9, when the second relay AP 300 is selected as the main service AP in the main service AP selection step (S200), the reception level Rx1 of the first relay AP 200 transmission signal is determined. Measuring step (S210), measuring the reception level (Rx2) of the second relay AP (300) transmission signal (S220), (Rx1-Rx2) is less than the lower limit value (S230), (Rx1- In step (S230), when the lower limit of Rx2) is not satisfied, when (Rx1-Rx2) is less than the lower limit, selecting the second relay AP 300 as the main service AP (S240), the data requested by the terminal 400 In the step of checking whether the maximum transmission rate of the second relay AP 300 is exceeded (S250), and in the step of confirming the second relay AP maximum transmission rate exceeding (S250), the transmission rate required by the terminal 400 when the maximum transmission rate is exceeded And the second relay AP 300 receiving the insufficient transmission rate of the maximum transmission rate from the first relay AP 200, the second Ray may include the step (S260) for performing cooperative communication with terminal 400 with the AP (300).

That is, when the terminal 400 is located close to the second relay AP 300, the second relay AP 300 is used as the main service AP, and if the maximum capacity provided by the main service AP is exceeded, the insufficient transmission rate is first. By providing through the relay AP 200, there is an advantage of increasing the data transmission efficiency between the network 100 and the first relay AP 200, and increasing the transmission efficiency of the entire network.

FIG. 10 is a flowchart illustrating a case in which either the first relay AP 200 or the second relay AP 300 is selected and used as the main service AP in the main service AP selection step S200 of FIG. 7.

As can be seen in Figure 10, in the main service AP selection step (S200) of the first relay AP 200 or the second relay AP (300), when selecting one of the main service AP to use, the first relay The step (S310) of measuring the reception level (Rx1) of the transmission signal of the AP 200, and the step of measuring the reception level (Rx2) of the transmission signal of the second relay AP (300) (S320), (Rx1-Rx2) are the upper limit values. In step (S330) of checking whether it is less than or equal to the lower limit value, and below the upper limit value of (Rx1-Rx2) and in the abnormality checking step (S330), when (Rx1-Rx2) is lower than or equal to the upper limit value and higher than the lower limit value, the first relay AP 200 Selecting one of the first relay AP 200 or the second relay AP 300 as the main service AP to transmit and receive data to and from the terminal 400 so that the transmission rate of the terminal is minimum (S340) and the terminal 400. Checking whether the requested data exceeds the maximum transmission rate of the main service AP (S350), And in the step (S350) of exceeding the maximum transmission rate of the main service AP, if the maximum transmission rate is exceeded, the first relay AP 200 or the second relay AP 200 or the second transmission rate is insufficient for the transmission rate required by the terminal 400 and the maximum transmission rate of the main service AP. It may include a step (S360) of performing the cooperative communication with the main service AP received by the AP not selected as the main service AP among the relay AP (300).

That is, when the terminal 400 is located between the first relay AP 200 and the second relay AP 300, the main service is an AP having high data transmission efficiency between the network 100 and the first relay AP 200. When it is used as an AP and exceeds the maximum capacity provided by the main service AP, data transmission efficiency between the network 100 and the first relay AP 200 is increased by providing insufficient transmission rate through the remaining APs, and the overall network transmission efficiency is improved. There is an advantage that can be increased.

As described above, the multi-hop improvement route selection device and method of the Wi-Fi cooperative communication relay according to the present invention has an advantage of routing possible in consideration of the transmission efficiency of the relay so that the Wi-Fi multi-hop can be improved, and relays data required by the terminal. There is an advantage that can be provided by dividing from.

What has been described above includes examples of one or more embodiments. Of course, rather than describing all possible combinations of components or methods for the purpose of describing the above-described embodiments, those skilled in the art can recognize that many additional combinations and substitutions of various embodiments are possible. Accordingly, the described embodiments are intended to cover all alternatives, modifications and variations that are within the spirit and scope of the appended claims.

Claims

A first relay AP that transmits and receives data to and from the network;

A second relay AP transmitting and receiving the data through the first relay AP; And

And a terminal for transmitting and receiving the data through at least one of the first relay AP or the second relay AP.
According to claim 1,

The terminal preferentially transmits and receives the data from the first relay AP when the 'reception level (Rx1) of the first relay AP-the reception level (Rx2) of the second relay AP' measured by the terminal is equal to or higher than the upper limit value. Multi-hop improvement route selection device of the WiFi cooperative communication relay, characterized in that.
According to claim 1,

The terminal preferentially transmits and receives the data from the second relay AP when the 'reception level (Rx1) of the first relay AP-the reception level (Rx2) of the second relay AP' measured by the terminal is lower than or equal to the lower limit value. Multi-hop improvement route selection device of the WiFi cooperative communication relay, characterized in that.
According to claim 1,

When the terminal measures the reception level (Rx1 of the first relay AP-reception level (Rx2) of the second relay AP) measured by the terminal is less than or equal to an upper limit value or more than a lower limit value, the first relay transmits and receives the network. A multi-hop improvement route selection device of a Wi-Fi cooperative communication relay, characterized in that the data is transmitted and received preferentially from either the first relay AP or the second relay AP so that the transmission rate of the AP is minimized.
The method of claim 4,

The transmission rate of the first relay AP, multi-hop improvement path selection device of the Wi-Fi cooperative communication relay, characterized in that calculated based on the reception level and channel bandwidth of the first relay AP received from the terminal.
The method of claim 4,

The transmission rate of the first relay AP, multi-hop improvement path selection device of the Wi-Fi cooperative communication relay, characterized in that calculated based on the reception level and channel bandwidth of the first relay AP received from the second relay AP.
The method of claim 4,

The transmission rate of the first relay AP, multi-hop improvement path selection device of the Wi-Fi cooperative communication relay, characterized in that calculated based on the reception level and channel bandwidth of the second relay AP received from the terminal.
The method of claim 4,

When the first relay AP preferentially transmits and receives the data, the 'reception level (Rx1) of the first relay AP-reception level (Rx2) of the second relay AP' measured by the terminal is changed to a lower limit or less. Multi-hop improvement path selection device of the Wi-Fi cooperative communication relay, characterized in that for transmitting and receiving the data preferentially from the second relay AP only.
The method of claim 4,

When the second relay AP preferentially transmits and receives the data, the 'reception level (Rx1) of the first relay AP-reception level (Rx2) of the second relay AP' measured by the terminal is changed to an upper limit or higher. Multi-hop improvement path selection device of the Wi-Fi cooperative communication relay, characterized in that for transmitting and receiving the data preferentially from the first relay AP only.
According to claim 1,

The terminal, multi-hop improvement path selection device of the Wi-Fi cooperative communication relay, characterized in that for performing cooperative communication based on at least one of time separation, frequency separation, spatial separation with the first relay AP or the second relay AP .
The method of claim 10,

The terminal comprises at least one of the time separation or different subcarriers, different subchannels, and frequency separation including different channels, including different time arrangements in a frame. Optional device.
The method of claim 10,

The terminal is a multi-hop improvement path selection device of a Wi-Fi cooperative communication relay, characterized in that it comprises spatial separation including any one of spatial diversity, pattern diversity, multi input multi output (MIMO), and Alamouti.
A reception level measurement step of measuring data reception levels of the first relay AP and the second relay AP in the terminal;

A main service AP selection step in which the terminal selects either the first relay AP or the second relay AP as a main service AP;

A maximum transmission rate exceeding confirmation step of checking whether a transmission rate required by the terminal exceeds a maximum transmission rate of the main service AP; And

When the maximum transmission rate is exceeded, the insufficient transmission rate of the transmission rate required by the terminal and the maximum transmission rate of the main service AP is provided to the first relay AP or the second relay AP that is not selected as the main service AP, and the A cooperative communication step of performing cooperative communication with the main service AP.
The method of claim 13,

When selecting the first relay AP as the main service AP in the main service AP selection step,

A first relay AP transmission signal reception level (Rx1) measurement step of measuring a reception level (Rx1) of the first relay AP transmission signal;

A second relay AP transmission signal reception level (Rx2) measuring step of measuring the reception level (Rx2) of the second relay AP transmission signal;

A step of confirming that (Rx1-Rx2) exceeds the upper limit of (Rx1-Rx2);

A first relay AP service step of selecting the first relay AP as the main service AP when (Rx1-Rx2) is greater than the upper limit in the step of checking the upper limit of (Rx1-Rx2);

A first relay AP maximum transmission rate exceeding step of checking whether data requested by the terminal exceeds a maximum transmission rate of the first relay AP; And

In the first relay AP maximum transmission rate exceeding confirmation step, when the maximum transmission rate is exceeded, the first relay receives the transmission rate required by the terminal and the insufficient transmission rate of the maximum transmission rate of the first relay AP from the second relay AP And a cooperative communication step of performing cooperative communication with the terminal together with the AP.
The method of claim 13,

When selecting the second relay AP as the main service AP in the main service AP selection step,

A first relay AP transmission signal reception level (Rx1) measurement step of measuring a reception level (Rx1) of the first relay AP transmission signal;

A second relay AP transmission signal reception level (Rx2) measuring step of measuring the reception level (Rx2) of the second relay AP transmission signal;

A step of confirming that (Rx1-Rx2) is less than the lower limit of (Rx1-Rx2);

A second relay AP service step of selecting the second relay AP as the main service AP when (Rx1-Rx2) is less than a lower limit value in the step of confirming that the lower limit value of (Rx1-Rx2) is less than the lower limit value;

A second relay AP maximum transmission rate exceeding step of checking whether data requested by the terminal exceeds a maximum transmission rate of the second relay AP; And

In the second relay AP maximum transmission rate exceeding confirmation step, when the maximum transmission rate is exceeded, the second relay receives the transmission rate required by the terminal and the insufficient transmission rate of the maximum transmission rate of the second relay AP from the first relay AP And a cooperative communication step of performing cooperative communication with the terminal together with the AP.
The method of claim 13,

In the step of selecting the primary service AP, when one of the first relay AP or the second relay AP is selected and used as the primary service AP,

A first relay AP transmission signal reception level (Rx1) measurement step of measuring a reception level (Rx1) of the first relay AP transmission signal;

A second relay AP transmission signal reception level (Rx2) measuring step of measuring the reception level (Rx2) of the second relay AP transmission signal;

A step of checking below (Rx1-Rx2) and below the upper limit of (Rx1-Rx2) to check whether (Rx1-Rx2) is below the upper limit and above the lower limit;

In the step of checking the lower limit and higher than the upper limit of (Rx1-Rx2), when (Rx1-Rx2) is lower than or equal to the upper limit and greater than or equal to the lower limit, the first relay AP or the second relay so that the transmission rate in the first relay AP is minimum. A main service AP selection and data service step of selecting one of the APs as the main service AP and transmitting / receiving data to and from the terminal;

A step of confirming a maximum transmission rate exceeded of the main service AP to determine whether data requested by the terminal exceeds a maximum transmission rate of the main service AP; And

In the step of checking the maximum transmission rate of the main service AP, if the maximum transmission rate is exceeded, the insufficient transmission rate between the transmission rate required by the terminal and the maximum transmission rate of the main service AP is selected from the first relay AP or the second relay AP. A cooperative communication step of performing cooperative communication with the main service AP received by an AP that is not selected as the main service AP.