KR101214617B1 - Coexistence system to integrate heterogeneous wireless network devices using the same frequency band into one hardware board and its operation method - Google Patents

Abstract

The present invention relates to a coexistence system and a method of operating the same for integrating and coexisting heterogeneous wireless network devices using the same frequency band in one board. The present invention relates to IEEE 802.11 WLAN and IEEE 802.15.4 LR- using the same frequency band. Coexistence system to integrate and coexist heterogeneous wireless network devices using the same frequency band on one board, which can solve the synchronization problem in using active wireless channel reservation scheme by integrating WPAN on one board. And a method of operation thereof.

To this end, the present invention includes: first wireless network equipment for generating an interrupt that actively requests to reserve a wireless channel; Synchronizing means for transmitting a radio channel reservation request interrupt to synchronize time information of the first wireless network equipment and the second wireless network equipment using the same frequency band as the first wireless network equipment; And reserves a wireless channel through a request to send (RTS) / clear to send (CTS) exchange scheme according to a radio channel reservation request interrupt from the synchronization means, and is deactivated during the reservation period, thereby interfering with the first wireless network equipment. The second wireless network equipment for enabling a wireless channel to be used without a charge, wherein the software and network interface card (NIC) of the first wireless network equipment, the synchronization means, and the second wireless network equipment Equipped with integrated software.

IEEE 802.11 WLAN, IEEE 802.15.4 LR-WPAN, Interrupt, Active Wireless Channel Reservation, RTS, CTS

Description

Coexistence system to integrate heterogeneous wireless network devices using the same frequency band into one hardware board and its operation method}

1 is a configuration diagram of an embodiment of a coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band on a single board;

2 is a diagram illustrating an interface of an IEEE 802.11 WLAN and an IEEE 802.15.4 LR-WPAN coexistence system according to the present invention;

3 is a diagram illustrating an operation of a coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band according to the present invention on a single board.

* Explanation of symbols on the main parts of the drawing

10: IEEE 802.11 WLAN 11: IEEE 802.11 WLAN NIC

12: IEEE 802.11 WLAN AP Software

20: ACROS 30: IEEE 802.15.4 LR-WPAN

31: IEEE 802.15.4 LR-WPAN NIC

32: IEEE 802.15.4 LR-WPAN Coordinator Software

The present invention relates to a coexistence system and a method of operating the same for integrating and coexisting heterogeneous wireless network devices using the same frequency band on a single board, and more particularly, to an IEEE 802.11 WLAN using the same frequency band. The present invention relates to a coexistence system and an operating method thereof so that an IEEE 802.15.4 LR-WPAN (Low Rate Wireless Personal Area Network) can operate simultaneously through an active channel reservation technique.

As the necessity of providing complex services centered on human life centered around broadband high-speed communication network and home network, technologies related to the construction of smart home environment using various next-generation information devices including existing home appliances as well as internet are actively researched and developed. have.

In this situation, IEEE 802.15.4 LR-WPAN (low-speed WPAN) enables low-speed wireless connection in fixed or mobile and portable environments. IEEE for home networking and in-home applications Compared to the 802.11 group and IEEE 802.15 (Bluetooth devices), it has a low complexity, ultra-power, and low cost, and is attracting attention as a system suitable for a wireless home network environment.

As such, the IEEE 802.15.4 LR-WPAN system suitable for wireless home network deployment environment has 2.4GHz frequency band, which is Industrial, Scientific and Medical (ISM), and Europe, like IEEE 802.11 wireless LAN standard and IEEE 802.15.1 Bluetooth standard. It uses the 868 / 915MHz frequency band used in the United States.

In particular, IEEE 802.11 WLAN technology and IEEE 802.15.4 LR-WPAN technology may cause mutual interference because the 2.4GHz ISM band does not need to be approved by the government. It can be serious as the prevalence expands.

In order to solve this problem, the active channel reservation scheme is an IEEE 802.11 WLAN AP using a Request To Send / Clear To Send (RTS / CTS) exchange method for a communication period of IEEE 802.15.4 LR-WPAN. Solve this problem by actively booking

However, in order to use an active wireless channel reservation scheme, an IEEE 802.11 WLAN AP and an IEEE 802.15.4 LR-WPAN coordinator must be integrated into one. This is because the IEEE 802.11 WLAN AP must accurately reserve a relatively short communication period of the IEEE 802.15.4 LR-WPAN. If not, there is a problem that the IEEE 802.15.4 LR-WPAN can not guarantee the stable communication, and the throughput of the IEEE 802.11 WLAN can be reduced due to the unnecessary reservation of the wireless channel.

The present invention has been proposed to solve the above problems, by combining the IEEE 802.11 WLAN and IEEE 802.15.4 LR-WPAN using the same frequency band on a single board, synchronization in the active wireless channel reservation scheme It is an object of the present invention to provide a coexistence system and a method of operation thereof for integrating and coexisting heterogeneous wireless network devices using the same frequency band that can solve the problem on one board.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a coexistence system for integrating and coexisting heterogeneous wireless network devices in a single board, comprising: a first wireless network device for generating an interrupt request for actively reserving a wireless channel; Synchronizing means for transmitting a radio channel reservation request interrupt to synchronize time information of the first wireless network equipment and the second wireless network equipment using the same frequency band as the first wireless network equipment; And reserves a wireless channel through a request to send (RTS) / clear to send (CTS) exchange scheme according to a radio channel reservation request interrupt from the synchronization means, and is deactivated during the reservation period, thereby interfering with the first wireless network equipment. The second wireless network equipment for enabling a wireless channel to be used without a charge, wherein the software and network interface card (NIC) of the first wireless network equipment, the synchronization means, and the second wireless network equipment Equipped with integrated software.

Meanwhile, the present invention provides a method of operating a coexistence system for integrating and coexisting heterogeneous wireless network devices in one board, the method comprising: generating an interrupt request for a first wireless network equipment to actively reserve a wireless channel; ; In order to synchronize time information of the second wireless network equipment that uses the same frequency band as the first wireless network equipment with the first wireless network equipment, an active radio resource reservation apparatus generates a radio channel reservation request interrupt to the second wireless network. Delivering to the equipment; And according to the radio channel reservation request interrupt, the second radio network equipment reserves a radio channel through a request to send (RTS) / clear to send (RTS) exchange scheme and is deactivated during a reservation period, thereby deactivating the first radio. Allowing the network equipment to use the wireless channel without interference, wherein the software and network interface card (NIC) of the first wireless network equipment on one board, the active radio resource reservation device (ACROS daemon software), And software for the second wireless network equipment.

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The present invention relates to a hardware configuration (coexistence system) and an operation method for allowing IEEE 802.11 WLAN and IEEE 802.15.4 LR-WPAN using the same frequency band to operate simultaneously. Point and the coordination of IEEE 802.15.4 LR-WPAN on a single board, allowing IEEE 802.11 WLAN APs to actively reserve channels for IEEE 802.15.4 LR-WPAN. To solve the synchronization problem.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an embodiment of a coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band according to the present invention in a single board. The WLAN and IEEE 802.15.4 LR-WPAN functions are integrated on one board.

As shown in FIG. 1, a coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band according to the present invention on a board may generate an interrupt requesting to actively reserve a wireless channel. Second wireless network equipment (IEEE) using the same frequency band as the first wireless network equipment (IEEE 802.15.4 LR-WPAN 30) and the first wireless network equipment (IEEE 802.15.4 LR-WPAN 30) In order to synchronize the time information of the 802.11 WLAN 10, a synchronization means (Active Channel Reservation for cOexiStence (ACROS) 20) for transmitting a radio channel reservation request interrupt and Request To RTS according to the radio channel reservation request interrupt Reserve a wireless channel via Send / Clear To Send (CTS) exchange, and it is disabled during the reservation period, allowing the first wireless network equipment (IEEE 802.15.4 LR-WPAN 30) to use the wireless channel without interference. Let Includes a second wireless network equipment (IEEE 802.11 WLAN 10), but the software (IEEE 802.15.4 LR-WPAN coordinator) of the first wireless network equipment (IEEE 802.15.4 LR-WPAN 30) on one board Software 32) and software (IEEE 802.15) of the IEEE 802.15.4 LR-WPAN network interface card (NIC) 31, the synchronization means (ACROS 20), and the second wireless network equipment (IEEE 802.11 WLAN 10). .4 WLAN AP software 12) can be integrated to resolve synchronization issues in using active wireless channel reservation techniques.

Here, the first wireless network equipment (IEEE 802.15.4 LR-WPAN 30) is the IEEE 802.15.4 LR-WPAN (Low) using the same frequency band as the second wireless network equipment (IEEE 802.11 WLAN 10) Network Interface Card (NIC) 31 of Rate Wireless Personal Area Network (NIC) and software 32 for operating as an IEEE 802.15.4 LR-WPAN coordinator. In addition, the second wireless network equipment (IEEE 802.11 WLAN 10) is an IEEE 802.11 Wireless Local Area Network (WLAN) using the same frequency band as the first wireless network equipment (IEEE 802.15.4 LR-WPAN 30). Network interface card (NIC) 11 and software 12 for operating with an IEEE 802.11 WLAN access point (AP).

ACROS 20 also mediates IEEE 802.11 WLAN AP software 12 and IEEE 802.15.4 LR-WPAN coordinator software 32. ACROS 20 then instructs IEEE 802.11 WLAN AP software 12 to send the RTS.

In addition, in the RTS / CTS exchange in the second wireless network equipment (IEEE 802.11 WLAN 10), the IEEE 802.11 WLAN NIC 11 by using an address that does not exist in the actual network for the address of the equipment to use the wireless channel. And coexistence of the two technologies without modifying the IEEE 802.15.4 LR-WPAN NIC 31 at all.

Next, with reference to Figure 2 will be described with respect to the interface (interface) of the IEEE 802.11 WLAN (10) and IEEE 802.15,4 LR-WPAN.

FIG. 2 is an exemplary diagram illustrating an interface of an IEEE 802.11 WLAN and an IEEE 802.15.4 LR-WPAN coexistence system according to the present invention. 30) It shows the configuration for actual operation of coexistence between them.

The coexistence system of the present invention includes one integrated board and an IEEE 802.11 WLAN NIC 11. Here, the integrated board is the IEEE 802.11 WLAN AP software 12, IEEE 802.15.4 LR-WPAN NIC 31, IEEE 802.15.4 LR-WPAN coordinator software 32, and ACROS (daemon process) 20).

The IEEE 802.11 WLAN NIC 11 uses an existing NIC of the IEEE 802.11 WLAN 10. It is meaningful in that coexistence of the two technologies (10, 30) is achieved without modification of existing equipment.

The IEEE 802.11 WLAN AP software 12 communicates with the ACROS daemon process 21 and the IEEE 802.11 WLAN NIC 11, and sends commands for coexistence received from the ACROS daemon process 21 to the IEEE 802.11 WLAN NIC. Deliver to 11. Other functions are the same as the existing IEEE 802.11 WLAN AP software.

In addition, the IEEE 802.15.4 LR-WPAN coordinator software 32 communicates with the ACROS daemon process 21 and the IEEE 802.15.4 LR-WPAN NIC 31, and the ACROS daemon process ( 21) and transmits and receives a synchronization signal, and controls the IEEE 802.15.4 LR-WPAN NIC (31) using this. Other functions are the same as the existing IEEE 802.15.4 LR-WPAN coordinator software.

The ACROS daemon process 21 will be described in more detail with reference to FIG. 3 below.

First, in step S100, the IEEE 802.15.4 LR-WPAN coordinator software 32 is active for the ACROS daemon process 21 for IEEE 802.15.4 LR-WPAN communication in step S120. Sends an interrupt signal requesting to reserve a wireless channel.

Thereafter, the ACROS daemon process 21 receiving the interrupt signal in step S110 actively instructs the IEEE 802.11 WLAN AP software 12 to transmit the RTS to reserve the radio channel.

At this time, when transmitting the RTS in step "S110", the address of the equipment to use the radio channel uses an address that does not actually exist in the network. The device responding to the transmission of the CTS transmits the CTS. Since the device that will receive the CTS and use the radio channel does not actually exist on the network, no one actually uses the radio channel. On the other hand, all other IEEE 802.11 WLAN equipments set their Network Allocation Vector (NAV), and thus do not use the radio channel for that period. This is because the RTS / CTS exchange itself is designed to solve the hidden node problem of wireless channel environments, so all other IEEE 802.11 WLAN devices use the wireless channel even though they feel that no one is actually using it. It is not used.

Therefore, in step S120, IEEE 802.15.4 LR-WPAN devices communicate. In this case, the IEEE 802.11 WLAN devices are set to NAV, so that the wireless channel is not used, and therefore, the IEEE 802.15.4 devices can use the wireless channel without interference with the IEEE 802.11 WLAN. At this time, the period of "step S120" can be set through the IEEE 802.15.4 LR-WPAN coordinator software 32, and the RTS / CTS frame generating the length of this period in step "S110". You should be able to make a reservation using

Next, in step S130, IEEE 802.11 WLAN devices communicate. The period of "step S130" is a period when the IEEE 802.15.4 LR-WPAN devices enter an inactive period of the IEEE 802.15.4 LR-WPAN designed to minimize power consumption, and communication is prohibited by the protocol itself. Therefore, IEEE 802.11 WLAN devices can use a wireless channel without interference with IEEE 802.15.4 LR-WPAN.

After that, after step S130, step S100 is performed again.

The ACROS daemon process 21 does not need to know the cycle in which these steps are repeated, and when the interrupt signal is received from the IEEE 802.15.4 LR-WPAN coordinator software 32, the " step S110 " do. As a result, the synchronization problem occurring between the IEEE 802.11 WLAN 10 and the IEEE 802.15.4 LR-WPAN 30 can be solved.

The method of the present invention as described above may be embodied as a program and stored in a computer-readable recording medium (such as a CD-ROM, a RAM, a ROM, a floppy disk, a hard disk, or a magneto-optical disk). Since this process can be easily implemented by those skilled in the art will not be described in more detail.

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 or scope of the invention. The present invention is not limited to the drawings.

The present invention as described above, in particular, even when the IEEE 802.11 WLAN and IEEE 802.15.4 LR-WPAN use the same frequency band, it is possible to ensure that each communication is successful without collision with each other, each throughput In addition to increasing the power consumption, the number of retransmissions may be reduced.

Claims (12)

In the coexistence system for integrating and coexisting heterogeneous wireless network devices in one board, First wireless network equipment for generating an interrupt that actively requests to reserve a wireless channel; Synchronizing means for transmitting a radio channel reservation request interrupt to synchronize time information of the first wireless network equipment and the second wireless network equipment using the same frequency band as the first wireless network equipment; And The wireless channel is reserved through a request to send (RTS) / clear to send (CTS) exchange method according to the radio channel reservation request interrupt from the synchronization means, and is deactivated during the reservation period, so that the first wireless network equipment is not interrupted. Including the second wireless network equipment to enable a wireless channel, A heterogeneous wireless network device using the same frequency band, comprising the same software and network interface card (NIC) of the first wireless network equipment, the synchronization means, and the software of the second wireless network equipment on one board. Coexistence system to integrate and coexist on one board. The method of claim 1, The first wireless network equipment, A network interface card (NIC) of an IEEE 802.15.4 LR-WPAN (Low Rate Wireless Personal Area Network) using the same frequency band as the second wireless network device; Integrating and coexisting heterogeneous wireless network devices on the same board, including software that operates as an IEEE 802.15.4 LR-WPAN coordinator (IEEE 802.15.4 LR-WPAN coordinator software) Coexistence system. The method of claim 2, The second wireless network equipment, A network interface card (NIC) of an IEEE 802.11 wireless local area network (WLAN) using the same frequency band as the first wireless network equipment; A coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band, including software for operating as an IEEE 802.11 WLAN access point (IEEE 802.11 WLAN AP software) on a single board. The method of claim 3, wherein The synchronization means, Heterogeneous wireless network devices using the same frequency band, characterized in that the ACROS (Active Channel Reservation for cOexiStence) software to mediate the IEEE 802.11 WLAN AP software and the IEEE 802.15.4 LR-WPAN coordinator software. Coexistence system to integrate and coexist on one board. 5. The method of claim 4, The IEEE 802.15.4 LR-WPAN coordinator software, Informing the ACROS software of the duration of a frame so that the IEEE 802.11 WLAN coexists with the IEEE 802.15.4 LR-WPAN. Coexistence system for integration and coexistence. The method according to claim 4 or 5, The ACROS software, A coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band in a single board instructing the IEEE 802.11 WLAN AP software to transmit an RTS. The method of claim 6, In the RTS / CTS exchange scheme in the second wireless network equipment, The IEEE 802.11 WLAN and the IEEE 802.15. Protocols, without modifying the IEEE 802.11 WLAN NIC and the IEEE 802.15.4 LR-WPAN NIC at all, using an address that does not exist in the actual network. 4 Coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band in which LR-WPAN coexists on one board. In a method of operating a coexistence system for integrating and coexisting heterogeneous wireless network devices in one board, Generating, by the first wireless network equipment, an interrupt actively requesting to reserve a wireless channel; In order to synchronize time information of the second wireless network equipment that uses the same frequency band as the first wireless network equipment with the first wireless network equipment, an active radio resource reservation apparatus generates a radio channel reservation request interrupt to the second wireless network. Delivering to the equipment; And According to the radio channel reservation request interrupt, the second wireless network equipment reserves a wireless channel through a Request To Send (RTS) / Clear To Send (RTS) exchange scheme, and is deactivated during the reservation period, thereby deactivating the first wireless network. Allowing the equipment to use the wireless channel without interference, The same frequency band, incorporating software and network interface card (NIC) of the first wireless network equipment, the active radio resource reservation device (ACROS daemon software), and software of the second wireless network equipment on one board A method for operating in a coexistence system for integrating and coexisting heterogeneous wireless network devices using a single board. 9. The method of claim 8, The first wireless network equipment, A network interface card (NIC) of an IEEE 802.15.4 LR-WPAN (Low Rate Wireless Personal Area Network) using the same frequency band as the second wireless network device, and an IEEE 802.15.4 LR-WPAN coordinator ( coordinator) software, The second wireless network equipment, And a network interface card of an IEEE 802.11 wireless local area network (WLAN) using the same frequency band as the first wireless network equipment, and software for operating as an IEEE 802.11 WLAN access point (IEEE 802.11 WLAN AP software). And operating in a coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band on a single board. The method of claim 9, The ACROS daemon software, A method for operating in a coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band in one board instructing the IEEE 802.11 WLAN AP software to transmit an RTS. 11. The method of claim 10, In the RTS / CTS exchange scheme in the second wireless network equipment, The IEEE 802.11 WLAN and the IEEE without modifying the NIC of the IEEE 802.11 WLAN and the NIC of the IEEE 802.15.4 LR-WPAN by using an address of a device that will use a radio channel that does not exist in the actual network. A method of operation in a coexistence system for integrating and coexisting heterogeneous wireless network devices using the same frequency band in which 802.15.4 LR-WPAN coexists in one board. delete

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