KR101370172B1 - Method for communicating in coexistable condition of at least one communication network - Google Patents

Abstract

This document relates to how one or more communication networks, in particular heterogeneous networks, can coexist.

According to the embodiment disclosed in this document, the common code is used to detect heterogeneous networks, and the information about the service level or coexists in the common code to coexist between heterogeneous networks more effectively indicates that there is interference during communication. Make sure to include information that

In addition, by setting a plurality of subbands consisting of narrow bands in one channel, it is possible to prevent interference and collision by using different subbands when multiple heterogeneous networks transmit beacons.

Coexistence, Common Codes, and Sensitivity of Heterogeneous Networks

Description

Method for communicating in coexistable condition of at least one communication network}

The present invention relates to a communication system and, more particularly, to a method for performing communication in an environment in which one or more communication networks can coexist.

2. Description of the Related Art Recently, there has been developed a wireless personal area network (hereinafter, referred to as " wireless personal area network "), ) Technology is being developed. WPANs can be used to exchange information between a relatively small number of digital devices at relatively short distances and enable low power and low cost communication between digital devices.

When communication is performed through wireless technology, it is possible to eliminate lines such as cables for connecting the devices. It is also possible to exchange data information directly between a device and a device through wireless network communication between the devices. Devices capable of communicating in the network include computers, PDAs, notebooks, digital TVs, camcorders, digital cameras, printers, microphones, speakers, headsets, bar code readers, displays, mobile phones, and all digital devices. Can be.

This document provides a method by which one or more communication networks, in particular heterogeneous networks, can coexist smoothly with respect to the prior art described above.

According to one embodiment of the present invention, a method of performing communication in an environment in which one or more communication networks can coexist may include searching for an available channel and receiving a common code shared by the one or more communication networks, wherein the common code is the above code. A common code receiving step is characterized by including the level information of the service transmitted and received in the network of the transmitting side of the common code.

The service level information may be determined through at least one of a service type including a streaming service and a file transfer service and a sensitivity to interference of the service. Here, the sensitivity to the interference of the service may be determined according to the service type.

The common code may be repeatedly received one or more times. In addition, the common code may be included in a beacon transmitted by the transmitting side network of the common code.

When the transmitting network of the common code is a homogeneous network, it is determined whether one or more of a service level is appropriate and whether the service level is changeable through the common code to start negotiation with the transmitting network of the common code. Alternatively, the common code may be used to check whether one or more of a service level is appropriate and whether the service level is changeable to re-discover another available channel.

If the transmitting side network of the common code is a heterogeneous network, the network may be started by checking whether the service level is appropriate through the common code, or the other available channels may be searched again.

In addition, when the transmitting network of the common code is a heterogeneous network, starting a network by checking a service level through the common code, receiving a common code indicating interference from the heterogeneous network, and Rescanning other available channels.

The available channel may include one or more subchannels of narrowband. Here, the one or more subchannels may be used for transmitting beacons in one or more heterogeneous networks using one channel. In addition, the one or more subchannels are used for transmitting beacons in one or more heterogeneous networks using one channel, and the one or more subchannels may be designated according to a service provided by the one or more heterogeneous networks.

Through the embodiments disclosed herein, coexistence between a plurality of heterogeneous networks may be performed more effectively.

By using a common code according to an embodiment disclosed in this document, it is possible to detect the existence and area of a heterogeneous network. Furthermore, by including information on service level in common code, more efficient entry into homogeneous network or heterogeneous network coexistence can be achieved. In addition, through the embodiment of using the common code repeatedly, it is expected that the effect of solving the inequality, disadvantage, etc. that comes from having a different area range for each heterogeneous network.

In addition, according to the embodiments disclosed in this document, a plurality of subbands having narrow bands are included in one channel, so that even if multiple heterogeneous networks coexist on one channel, effects of interference and signal collisions can be prevented. Is expected.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The detailed description set forth below in conjunction with the appended drawings is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details for a better understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. For example, the following description will focus on coordinators, devices, common codes, and the like, but need not be limited to these terms. The same meaning may be used even when referred to. In particular, if the common code means a signal that can be shared between one or more heterogeneous communication networks, the same meaning may be used even when referred to as an arbitrary term.

In some instances, well-known structures and / or devices may be omitted to avoid obscuring the concepts of the present invention, and may be represented in block diagrams and / or flowchart diagrams centered on the core functions of each structure and / or device have. In the following description, the same components are denoted by the same reference numerals throughout the specification.

The device initiating the communication checks whether or not a specific frequency channel to be used is used in another communication network. When more than one communication network can coexist, an example of how to check whether a specific frequency channel to be used is used by another communication network is to check a signal received on a specific frequency channel to be used. have.

In other words, when a device initiates communication, it periodically sends a signal to indicate that it is using a particular frequency channel. In this case, the method of transmitting a signal is preferably transmitted in the form of a broadcast so that any device included in a predetermined region without a specific receiving side is designated. As such, when a device using a specific frequency channel periodically transmits a signal through this specific frequency channel, a device approaching to use part or all of the specific frequency channel band receives the transmitted signal, and thus, the specific frequency. You can check whether the channel is available.

1 is a diagram illustrating a case where one or more heterogeneous networks can coexist.

Heterogeneous networks often have different channel coding methods and modulation methods as well as basic communication specifications such as transmission speed. In this case, the signal transmitted in the heterogeneous network may be treated as noise and the communication may be interrupted by the signal transmitted in the heterogeneous network. Therefore, in order not to be disturbed by each other due to coexistent heterogeneous network signals, communication will be started considering such a situation in advance.

More than one heterogeneous network may coexist in the same space. Even when all the communication is performed in heterogeneous networks in the same space, if different frequency channels are used in each network, each network signal can coexist smoothly without interrupting other network communication.

Therefore, it is possible to simply perform a channel search before starting the network to check whether there is a network communicating on the channel first, and use a different channel when a heterogeneous network is detected as a result of the check. Before starting the network, it is desirable to check whether there is a network currently formed in the channel to be used and start the network. That is, if there is a heterogeneous network already formed in the channel to be used, communication may be performed using another empty channel.

To do this, it is first necessary to know whether the heterogeneous network occupies a specific communication area. That is, if there is a heterogeneous network in communication, the heterogeneous network should be able to be detected through a signal transmitted from the heterogeneous network. Herein, the specific communication area is defined, but in this document, when a beacon of a network is broadcast using one channel or a specific signal is transmitted in the network, the present invention will be defined as meaning a beacon area that is correctly received. Can be.

Two or more heterogeneous networks are unprotected when a device trying to start another network does not recognize the communication area of the network through a beacon of the network or a specific signal transmitted from the network even when the network is performing communication by occupying a specific communication area. Coexistence in the state cannot be prevented, and communication failure will be expected.

As described above, a signal used to confirm whether a specific frequency channel is used through transmission and reception of a signal may be a preamble signal capable of identifying a specific communication network, and a signal having a predetermined pattern from the preamble signal. That is, the detection object signal may be separately configured and transmitted together with the preamble signal. In addition, as suggested by the embodiment of the present invention, it may be a common code shared by one or more heterogeneous networks. Here, the common code may be transmitted together with or alternatively to the preamble described above.

2 is a view for explaining an example of a method for detecting a coexistent heterogeneous network when one or more heterogeneous networks can coexist according to an embodiment of the present invention.

In the present embodiment, a method of setting and transmitting and transmitting common codes shared between one or more heterogeneous networks will be described in detail. In this case, the common code is transmitted between heterogeneous networks in a predetermined form, and thus, even a heterogeneous network signal is a signal that can be received and detected without distinguishing the type of network from the receiving side. Thus, a device receiving a common code, even though it is a signal transmitted from a heterogeneous network, can recognize and detect that there is a network in communication on this area and on this channel.

A device initiating a network or a coordinator performing resource scheduling in the network may announce its area by broadcasting a common code.

Here, the common code may be included in the beacon to be broadcast together with the beacon. FIG. 2 shows an embodiment in which a common code proposed in this embodiment is added to a beacon configuration. As described above, when the common code is transmitted together with the beacon, the common code can be periodically transmitted in correspondence with the beacon period and can be transmitted to the beacon area, that is, the communication area. In particular, when the above-described common code is inserted at the beginning of the beacon as shown in FIG. 2, the existing beacon can be used as it is, so that switching between the beacon with the common code inserted and the non-beacon is relatively freely performed. The expected effect is also expected. Obviously, the same common code may be inserted at the end of the beacon for the same effect.

In addition, the common code may include level information of a service transmitted and received on the network of the transmitting side of the common code. The service level information may be determined according to a service type including a streaming service and a file transfer service. For example, in consideration of each characteristic of the services that can be provided, the level is allocated for each service, and when the common code is transmitted, the common code is transmitted including the level information of the service that can be provided in the current network. Here, in determining the service level, various factors such as the degree of influence from interference and the communication area of the network may be considered.

In addition, the service level information may be determined according to the sensitivity to interference of each service. For example, in the case of a streaming service of high-definition video, the service is very sensitive to interference. That is, when interference signals are received due to the coexistence of heterogeneous networks, the effect is immediately displayed on the video screen, which causes a big problem in the quality of service. On the other hand, services such as file transfer are relatively unaffected by interference. For example, even if a disturbance signal is received due to coexistence of heterogeneous networks, if the data transmission is interrupted by this signal, the overall data transfer rate may be lowered by resending or slowing down the data. It will not be a lowering factor. Therefore, a high level can be assigned to a service sensitive to interference and a low level can be assigned to a service that is relatively insensitive to interference. Of course, in determining the above-described service level, it is natural that the above-mentioned decision may be made mainly considering the sensitivity of the above-described interference of each service.

The service level may be divided into three levels, for example. In particular, when determining the service level according to the sensitivity of the interference of the service, the level 1 when the sensitivity of the service is 'high', level 2 when the sensitivity of the service is 'medium' If the sensitivity is low, it can be determined as level 3. This is only an example of determining the service level, and it is natural that the granularity can be decided more and more, or vice versa.

3 is a diagram for explaining a case where different beacon areas of one or more heterogeneous networks are different.

Heterogeneous networks may communicate with each other in a different communication area according to the characteristics of each network. In other words, the communication areas of the heterogeneous networks are not all the same.

Inequality problems arise when the beacon areas of heterogeneous networks differ. That is, no matter how a common code is transmitted in a narrow beacon area, it can only be received by a device within the narrow beacon area, so a device searching for a channel outside the beacon area cannot detect this. Thus devices outside this area will initiate heterogeneous networks and perform communications. However, if the beacon area of this network is wider than the beacon area of the communicating network first, it may invade the communicating network area first.

In addition, as described above, a device included in a newly-initiated heterogeneous network as well as a network in communication, but located at a boundary point of the heterogeneous network, may first be interfered with by the network in communication.

4 is a view for explaining an example of a method for recognizing heterogeneous networks that can coexist when the beacon areas of one or more heterogeneous networks are different according to one embodiment of the present invention.

As can be seen with reference to FIG. 4, the aforementioned common code may be repeatedly transmitted one or more times. In particular, the case of FIG. 4 shows the case of transmitting repeatedly three times. As described above, when the common code is repeatedly transmitted several times, the signal to noise ratio (SNR) is improved due to the repetition pattern of the common code as compared with the case of only one transmission, thereby expanding the communication area.

In other words, in a network having a narrow beacon area, a common code is transmitted to be recognized by other heterogeneous networks, but the common code is repeatedly transmitted one or more times. In this way, the code transmitted in the repeated pattern can extend the beacon region and solve the above inequality.

In this case, the repeated common code may be included in the beacon and broadcast together with the beacon. 4 shows an embodiment in which a common code proposed in this embodiment is repeatedly added to a beacon configuration. As described above, when the common code is transmitted together with the beacon, the common code may be periodically transmitted in correspondence with the beacon period and may be transmitted to an extended beacon area, that is, the communication area, and thus is very effective to inform the communication area.

5 is a diagram for explaining a case in which one or more heterogeneous networks coexist.

As described above, the common code or the common code including the service level information may be used to check and detect whether another heterogeneous network is performing communication on the region to be communicated and the channel. When a heterogeneous network is detected as described above, it is preferable to start the network by searching for other channels and finding an empty channel through the same method. However, since the number of channels that can be used in a certain area is limited, heterogeneous networks may simultaneously communicate on the same channel.

In this case, as described above, when the service code includes the service level information, for example, the service level information determined according to the sensitivity of the interference of each service, the damage caused by the interference can be reduced in consideration of the service level information. Coexist in any direction.

For example, if there is a network that is communicating first in a channel and wants to coexist and perform communication, the service level is checked through a common code. In this case, if the service level is determined as 'high', 'medium', or 'low' as in the above-described example, it is assumed that the level 1, the level 2, and the level 3 are respectively determined as sensitive to the level 3, that is, the interference. Select a channel with low service. As such, even if the service having the lowest sensitivity to interference coexists with the channel selection, the damage caused by the interference may be minimized.

Even when heterogeneous networks coexist on the same space and on the same channel to perform communication, when the signal used for communication uses millimeter wave, the directionality of the millimeter wave signal can perform communication without interfering with each other. . However, even if the millimeter wave is used, interference may occur depending on the position of the device. In particular, in the case of a beacon, since the signal is broadcast in all directions instead of one direction, the above-mentioned directional gains cannot be obtained.

As described above, even if coexistence and communication are performed, the interference can be prevented to some extent by coexisting in a manner that minimizes interference caused by interference. However, if more than one heterogeneous network performs communication on the same channel, This situation cannot be completely ruled out.

6 is a view for explaining an example of a method for notifying that interference from a heterogeneous network when one or more heterogeneous networks coexist according to an embodiment of the present invention.

When two or more heterogeneous networks using the same channel in the communication area coexist and receive an interference signal from another network, information indicating that there is interference is transmitted to the other network. In this case, since the information indicating the interference should be received and recognized by another network, it is preferable to use the aforementioned common code.

6 shows an example of a message structure that can be used when transmitting an interference signal from another network to transmit a common code indicating that there is interference to that other network. In this case, as shown in FIG. 6, the beacon may be transmitted while being included. In a network having a narrow beacon area, a common code indicating interference may be repeatedly transmitted.

If interference occurs while coexisting in this manner, if a common code indicating that there is interference can be transmitted, a common code indicating that there is interference transmitted from a network initiating and communicating first, even if a later-initiating network starts communication. It is desirable to pay attention to whether there is.

In a network that receives the common code indicating that the above-described interference exists, it may be necessary to reduce the generated interference to a predetermined threshold or less to maintain communication or to continuously perform communication by moving to another channel. For example, assume that a network receiving a common code indicating that there is interference is providing a file transfer service. In this case, it is possible to maintain communication on the current channel by using a data rate, a method of reducing transmission speed, and a method of reducing transmission power, in order to reduce interference, and to continue communication by searching for another channel and moving to an empty channel. .

An example of a method for constructing the common code described above will be described below. In this case, it is assumed that the common code includes service level information and may also include information indicating that there is interference if necessary.

Sensitivity level Code configuration High A A Medium A -A Low -A A Alert -A -A

Table 1 shows an example of how to configure a common code. In Table 1, A means any code that can be detected and recognized regardless of the type of network. For example, A may be a Becker code, a Golay code, a Walsh code, or the like. '-A' represents a code whose phase is changed from 'A'.

Sensitivity level Code configuration High A A Medium A B Low B A Alert B B

Table 2 shows another example of how to configure a common code. In Table 2, 'A' as in Table 1 means any code that can be detected and recognized regardless of the type of network. As described above, A may be a Becker code, a Golay code, a Walsh code, or the like. 'B' means a code having a characteristic orthogonal to 'A'.

FIG. 7 illustrates an example of a method of transmitting a beacon of each network when one or more heterogeneous networks communicating on one channel coexist according to an embodiment of the present invention.

As described above, when heterogeneous networks perform communication on the same channel at the same time, they may cause interference with each other. In this case, the probability of a signal transmitted in all directions such as a beacon is higher.

Therefore, the present embodiment proposes a method of setting one or more subchannels of narrowband in one channel and using the same to transmit beacons of respective heterogeneous networks.

FIG. 7A illustrates an example in which one or more subchannels having narrow bands are set on one channel. In other words, a total of five subchannels is set. When five subchannels are configured as described above, when up to five heterogeneous networks coexist, the beacon may be broadcast through different subchannels.

Furthermore, one or more subchannels are used for transmitting beacons in one or more heterogeneous networks using one channel, and the one or more subchannels may be designated and used according to a service provided by the one or more heterogeneous networks.

FIG. 7B illustrates an example in which a total of five subchannels having narrow bands are set on one channel as shown in FIG. 7A. Furthermore, FIG. 7B illustrates that some or all of the subchannels may be designated for each service level. In other words, at least one subchannel consisting of narrow bands may be set on one channel, but a designated subchannel may be used for a service level provided in a communication network, for example, a network providing an interference sensitive service. For example, a subchannel located among the five subchannels may be designated to be used in a network providing a level 1 service.

As such, when a service level is available for some or all subchannels, heterogeneous network detection is easy, and when a fast and secure frequency allocation is required according to service characteristics, it can be ensured, thereby enabling higher quality communication. . For example, if a network providing a lower level of service is using a channel first, and a network providing a higher level of service enters later, the channel of that channel is identified by identifying the subchannel designated for use by the higher level service. You can decide whether to use it.

8 is a flowchart for explaining an embodiment of the present invention.

In the present embodiment, it is assumed that the common code is transmitted to detect each other in one or more heterogeneous networks according to the above-described embodiments, and the common code includes sensitivity level information indicating a service level, for example, a sensitivity to interference. . 8 illustrates an example of entering a homogeneous network that is already disclosed using a common code, particularly a common code including sensitivity level information.

The device wishing to initiate the communication network first searches for an available channel in step S80. In this case, it may be determined whether a channel is available through whether a common channel is received.

In step S81, it is possible to confirm whether a homogeneous network is started before directly starting the communication network through channel search. The homogeneous network refers to a network that can perform scheduling by receiving scheduling information through the same coordinator. As a result of checking in step S81, if a homogeneous network, that is, an available coordinator is found, the sensitivity level information indicating the service level transmitted from the available coordinator in step S82, for example, the sensitivity to interference, is checked.

At this time, if the sensitivity level provided by the homogeneous network previously disclosed is the same as or higher than the service level to be provided by the device, negotiation is initiated with the coordinator in step S83, and the scheduling information is received to perform service transmission and reception.

However, if the sensitivity level provided by the previously disclosed homogeneous network is lower than the service level to be provided by the device, the quality of the service to be provided by the device cannot be guaranteed. Therefore, it is checked whether the sensitivity level provided by the previously disclosed homogeneous network can be changed to be equal to or higher than the sensitivity level of the service to be provided by the device.

In this case, it may be considered whether there is a heterogeneous network that provides a higher level of service to the current channel. That is, if there is a heterogeneous network that provides a higher level of service on the current channel, it is more likely that the sensitivity level provided by the previously disclosed homogeneous network cannot be changed to be equal to or higher than the sensitivity level of the service to be provided by the device. Will be high.

If it is possible to change the sensitivity level provided by the homogeneous network previously disclosed in step S84, negotiation is started on the condition that the sensitivity level is changed in step S83. However, if the sensitivity level provided by the homogeneous network previously disclosed in step S84 cannot be changed, the channel is rescanned in step S85 and the network is started through the other available channel in step S86 if there is another available channel.

By using the common code, the existence and area of the homogeneous network as well as the heterogeneous network can be confirmed. Furthermore, the information on the service level, such as the sensitivity level, is transmitted to the common channel to ensure higher communication quality while guaranteeing higher communication quality. You can enter

9 is a flowchart illustrating an embodiment related to a device having a high service level of the present invention.

In this embodiment, it is assumed that the common code is transmitted to detect each other in one or more heterogeneous networks according to the above-described embodiments, and the common code includes sensitivity level information indicating a service level, for example, a sensitivity to interference. . 9 illustrates an example of entering a heterogeneous network that is already disclosed by using a common code, particularly a common code including sensitivity level information. In particular, the case of entering the heterogeneous network when the sensitivity level of the service to be provided by the device is high.

In FIG. 9, each of steps S900 to S950 represents the same process as each of steps S80 to S85 in the above-described embodiment of FIG. 8. These processes may be performed, or as shown in FIG. 9, if the channel search result of step S900 does not find a homogeneous network, the network may be started using a channel that is not used in step S960 and all channels are connected to the heterogeneous network. If used, the process proceeds to step S970.

In step S970, the channel having the lowest sensitivity level is selected using the result of receiving the common code including the sensitivity level information from the network communicating in each channel.

In step S970, the channel having the lowest sensitivity level is selected to start the network when the sensitivity of the channel selected in step S980 is low, for example, at level 3. Since the service level of the heterogeneous network communicating first is low, even if the network is initiated and communicated on the same channel, there is a high probability that it will not significantly affect the communication of the heterogeneous network communicating first.

In this case, as described in the above-described example, when a plurality of subbands consisting of narrow bands is set in one channel, a collision probability can be further lowered by transmitting beacons using subbands different from those used in heterogeneous networks in communication. have. Furthermore, when some or all of the subbands are designated to be used for highly sensitive services, beacons may be transmitted using the designated subchannels.

In addition, when an interference occurs due to a signal to a heterogeneous network while starting a network and performing communication in this manner, a common code indicating that interference has occurred may be transmitted. Similarly, a common code may be received from the heterogeneous network indicating that interference has occurred. In this case, either side may lower the power to maintain coexistence or lower the data transmission rate. In this case, it may be desirable to perform these processes on the side of providing a service having low sensitivity to interference such as file transfer.

Although the channel having the lowest sensitivity level is selected in step S970, the network may be started even if the sensitivity of the channel selected in step S980 is high, for example, at level 1. However, there is a problem that two or more heterogeneous networks that provide a high sensitivity to interference coexist in one channel and thus cannot guarantee service quality.

10 is a flowchart illustrating an embodiment related to a device having a low service level of the present invention.

In this embodiment, it is assumed that the common code is transmitted to detect each other in one or more heterogeneous networks according to the above-described embodiments, and the common code includes sensitivity level information indicating a service level, for example, a sensitivity to interference. . 9 illustrates an example of entering a heterogeneous network that is already disclosed by using a common code, particularly a common code including sensitivity level information. In particular, the case of entering the heterogeneous network when the sensitivity level of the service to be provided by the device is low.

In FIG. 10, each of steps S1000 to S1050 represents the same process as each of steps S80 to S85 in the above-described embodiment of FIG. 8. These processes may be performed, or as shown in FIG. 10, if the channel search of step S1000 does not find a homogeneous network, the network may be started using a channel that is not used in step S1060, and all channels are allocated to the heterogeneous network. If used, the process proceeds to step S1070.

The channel having the lowest sensitivity level is selected in step S1070 by using the result of receiving the common code including the sensitivity level information from the network communicating in each channel.

In step S1070, the channel having the lowest sensitivity level is selected, and if the sensitivity of the channel selected in step S1080 is low, for example, level 3, the network is started as shown in step S1090. Since the service level of the heterogeneous network communicating first is low, even if the communication is initiated by performing a network on the same channel, the probability of not having a great influence on the communication of the heterogeneous network communicating first will be high.

In this case, as described in the above-described example, when a plurality of subbands consisting of narrow bands is set in one channel, a collision probability can be further lowered by transmitting beacons using subbands different from those used in heterogeneous networks in communication. have. In addition, when some or all of a plurality of subbands are designated to be used for a highly sensitive service, a beacon may be transmitted using an empty channel among the remaining subchannels except for the designated subchannel.

In addition, when an interference occurs due to a signal to a heterogeneous network while starting a network and performing communication in this manner, a common code indicating that interference has occurred may be transmitted. Similarly, a common code may be received from the heterogeneous network indicating that interference has occurred. In this case, either side may lower the power to maintain coexistence or lower the data transmission rate. In this case, it may be desirable to perform these processes on the side of providing a service having low sensitivity to interference such as file transfer. If the sensitivity to interference is the same or similar, the higher layer may indicate which of the transmission methods or the like should be changed.

If the channel having the lowest sensitivity level is selected again in step S1070, the network may be started as shown in step S1081 when the sensitivity of the channel selected in step S1080 is high, for example, at level 1. In this case, since the sensitivity of the service to be provided by the device performing this process is assumed to be low, even if the service sensitivity of the heterogeneous network that is already in communication is high, the probability of simultaneously performing communication without causing interference to the service of the heterogeneous network that is already in communication This will be higher.

In other words, the network is started in step S1081. In this case, as in the above-described step S1090, as described in the above-mentioned example, when a plurality of subbands consisting of narrow bands are set in one channel, a beacon is used by using a subband different from the subband used in the heterogeneous network in communication. The transmission probability can be further lowered.

Then, in step S1082, the common code transmitted from the heterogeneous network already in communication is observed. In operation S1083, the common code received from the heterogeneous network with which communication is already performed may include information indicating that interference has occurred as described above. When a common code including information indicating that interference has been received, the transmission power or data transmission rate may be lowered to maintain communication on this channel or move to another channel in step S1084 to continue the communication.

If the common code received from the heterogeneous network already in communication in step S1083 does not include the information indicating that the interference has occurred as described above, the communication can continue to be maintained on this channel.

11 is a flowchart for explaining another embodiment of the present invention.

In this embodiment, it is assumed that the common code is transmitted to detect each other in one or more heterogeneous networks according to the above-described embodiments, and the common code includes sensitivity level information indicating a service level, for example, a sensitivity to interference. . In the embodiment of Fig. 11, all the embodiments of Figs. 8 to 10 are shown at once. That is, an example of entering a homogeneous network that has already been started using a common code including a common code including information on sensitivity level, an example of starting a new network on an empty channel when there is no homogeneous network or cannot enter the homogeneous network, If there is no empty channel, an example of starting a network to coexist with a heterogeneous network is shown.

The description of each step is the same as described above with reference to FIGS. 8 to 10. However, the embodiment of FIG. 11 illustrates a case in which the service level to be provided by the device is not distinguished from a case where the sensitivity level for interference is high and low, for example, checking whether the sensitivity level is high or low, that is, steps S1170 and S1180. Is further included.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The foregoing description of the preferred embodiments of the present invention has been presented for those skilled in the art to make and use the invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims. You will know that you can.

That is, it is to be understood that this patent is not to be limited by the embodiments shown herein but is to be accorded the broadest scope consistent with the principles and features disclosed herein.

1 is a diagram illustrating a case where one or more heterogeneous networks can coexist.

FIG. 2 is a diagram for explaining an example of a method for recognizing a coexistent heterogeneous network when one or more heterogeneous networks can coexist.

3 is a diagram for explaining a case where different beacon areas of one or more heterogeneous networks are different.

4 is a view for explaining an example of a method for recognizing heterogeneous networks that can coexist when the beacon areas of one or more heterogeneous networks are different.

5 is a diagram for explaining a case in which one or more heterogeneous networks coexist.

6 is a view for explaining an example of a method for notifying that interference from heterogeneous networks when one or more heterogeneous networks coexist.

FIG. 7 illustrates an example of a method of transmitting a beacon of each network when one or more heterogeneous networks communicating on one channel coexist.

8 is a flowchart for explaining an embodiment of the present invention.

9 is a flowchart illustrating an embodiment related to a device having a high service level of the present invention.

10 is a flowchart illustrating an embodiment related to a device having a low service level of the present invention.

11 is a flowchart for explaining another embodiment of the present invention.

Claims (13)

A method of performing communication in an environment in which one or more communication networks can coexist, Searching for a specific frequency channel available; Receiving a common code shared by the one or more communication networks received through the specific frequency channel, wherein the common code includes service level information transmitted and received by a transmitting side network of the common code; And And determining whether to start a network in the specific frequency channel according to the service level information of the common code. The method of claim 1, And the common code is received repeatedly one or more times. The method of claim 1, And the service level information is determined through at least one of a service type including a streaming service and a file transfer service and a sensitivity to interference of the service. The method of claim 3, Sensitivity to the interference of the service, characterized in that determined according to the service type. The method of claim 1, And the common code is included in a beacon transmitted by the transmitting side network of the common code. The method of claim 1, And wherein the common code is included in one of a start portion and a last portion of a beacon transmitted by the transmitting side network of the common code. The method of claim 1, If the transmitting network of the common code is a homogeneous network, Determining whether to start the network, Initiating negotiation of resource scheduling with the transmitting network of the common code by checking at least one of whether the service level is appropriate and whether the service level is changeable through the common code; And Rescanning other available channels by checking one or more of whether the service level is appropriate and whether the service level is changeable through the common code;  And further comprising one of the. The method of claim 1, If the transmitting network of the common code is a heterogeneous network, Determining whether to start the network comprises: starting a network by checking whether a service level is appropriate through the common code; And Rescan for other available channels And further comprising one of the. The method of claim 1, If the transmitting network of the common code is a heterogeneous network, Determining whether to start the network, Receiving a common code indicating that there is interference from the heterogeneous network; And Rescan for other available channels A communication method comprising a. The method of claim 1, If the transmitting network of the common code is a heterogeneous network, Determining whether to start the network, Receiving a common code indicating that there is interference from the heterogeneous network; And Performing at least one of a method of reducing transmit power and a method of reducing transmit data rate. The method of claim 1, And the available channel comprises one or more subchannels of narrowband. The method of claim 11, Wherein the one or more subchannels are used for transmitting beacons in one or more heterogeneous networks using one channel. The method of claim 11, Wherein the one or more subchannels are used for transmitting beacons in one or more heterogeneous networks using one channel and the one or more subchannels are designated according to a service provided by the one or more heterogeneous networks.

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