KR101455717B1 - Method for building an effective network of WPAN devices in WPAN and WLAN based integrated network environment - Google Patents

Abstract

More particularly, the present invention relates to a wireless personal area network (WPAN) based on IEEE 802.15.4 using the same frequency of 2.4 GHz band and a wireless local area network (WLAN) of IEEE 802.11g The present invention relates to a method of forming an efficient network according to whether a WPAN device can manually set an initial operation channel in a hybrid network environment.
According to the present invention, a non-beacon mode active scanning algorithm is applied when the initial operation channel of the WPAN devices can be manually set, and a half beacon (Half Beacon) Beacon mode passive scanning algorithm is applied. Therefore, it is possible to efficiently and smoothly associate the devices by setting the automatic WPAN operation channel.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for forming an efficient network of WPAN devices in a hybrid network environment of WPAN and WLAN,

More particularly, the present invention relates to a wireless personal area network (WPAN) based on IEEE 802.15.4 using the same frequency of 2.4 GHz band and a wireless local area network (WLAN) of IEEE 802.11g The present invention relates to a method of forming an efficient network according to whether a WPAN device can manually set an initial operation channel in a hybrid network environment.

The present invention also relates to a storage medium storing a program command code for implementing an efficient network forming method according to whether a WPAN device can manually set an initial operation channel in a hybrid network environment in which WPAN and WLAN are combined.

The IEEE 802.15.4 protocol defines the characteristics and functions of the physical layer and MAC (Media Access Control) layer of a low-speed wireless personal area network (hereinafter referred to as " WPAN ") technology called ZigBee.

IEEE 802.15.4 low speed WPAN is one of the most suitable protocols for wireless sensor networks. WPAN technology, which has low power, low data rate and low cost, is essential for improving operational operation because it is important in environments where the connection line is difficult or the connection line is twisted like various devices installed inside the network members. Can be applied.

In order to transmit and receive video, voice, sensor, and professional data among network members to the WPAN, a hybrid network combining WLANs can be operated.

(I) WPAN operation Channel operation method

ZigBee WPAN based on IEEE 802.15.4 uses three bands such as 868MHz (Europe), 915MHz (US) and 2.4GHz (worldwide) as operating frequency channels. According to analysis of the 2.4GHz band which can be operated globally, the number of channels is 16 channels (2.4 GHz to 2.4835 GHz) with channel numbers 11 to 26, each channel interval is 5 MHz, and the bandwidth per channel is 2 MHz to be. In addition, the channel center frequency is expressed by the following equation.

(Ii) WLAN operation channel operating method

IEEE 802.11g based WLAN operating in the frequency range of 2.4GHz ~ 2.4835GHz, which is the same as the operating frequency band of ZigBee WPAN, has 14 22MHz bandwidth channels, and the interval per channel is 5MHz.

If the distance between the center frequencies is at least 25 MHz, the channels can be used simultaneously without interference. The IEEE 802.11g standard recommendation channel uses channel 1 (2401 MHz to 2423 MHz), channel 6 (2426 MHz to 2448 MHz) and channel 11 (2451 MHz to 2473 MHz) which do not overlap with each other in North America, (2401 MHz to 2423 MHz), 7 (2431 MHz to 2453 MHz), and 13 (2461 to 2483 MHz) channels which are not overlapped with each other are used.

(Iii) Comparison of WPAN and WLAN operation channel operation

FIG. 1 shows a comparison between the operational channels of the IEEE 802.15.4-based ZigBee WPAN and the IEEE 802.11g-based WLAN in the 2.4 GHz band. You can see ZigBee WPAN channels that do not overlap with WLAN recommendation channels in North America and Europe.

In order to coexist WLAN and ZigBee WPAN, it is necessary to use frequency bands that do not overlap each other. For example, when WLAN of a specific communication network is fixedly used as channel 1, one of 12 channels To allow ZigBee WPAN operation.

However, in order to satisfy the requirements for minimizing the size and weight of each WPAN device and the operational convenience of combat operation, it is sometimes impossible to set the manual operation channel of the devices. In the network formation method specified in the IEEE 802.15.4 protocol, Frequency collisions can not be avoided.

(Iv) channel scan

The purpose of the channel scan can be summarized in three prior to the Association: conventional PAN confirmation, new PAN initiation and PAN ID conflict resolution. All devices can perform Passive and Orphan scans according to the specified channel list.

In addition, a full-function device (FFD) must be capable of performing energy detection (ED) and active scanning. The device is requested to initiate a channel scan via the MLME-SCAN.request primitive, and the channel is sequentially scanned from the lowest channel number to the highest channel number.

During the scan period, the device must stop beacon transmission and accept only frames received through the physical layer data service associated with the scan, if possible. When the scan is complete, the device resumes the beacon transmission and the scan results are verified through the MLME-SCAN.confirm primitive.

In an ED scan, the device acquires a measure of the highest energy on each required channel. The ED scan is used by the future PAN coordinator to select the appropriate operating channel prior to starting the new PAN.

심벌시간 동안 ED 측정을 반복적으로 수행한다.During an ED scan, the MAC sublayer shall discard all frames received via the physical layer data service. For each logical channel

The ED measurement is repeatedly performed during the symbol time.

은 MLME-SCAN.request 프리미티브의 ScanDuration 파라미터 값이며, 0~14까지의 범위를 갖는 정수이다. 이러한 ED 스캔 기간 동안 획득된 최대 ED 측정치는 채널 목록에 있는 다음 채널로 이동하기 전에 통보되어야 한다. ED 스캔은 저장된 채널 ED 측정 개수가 구현으로 지정된 최대값과 동일하거나, 에너지가 지정된 각각의 논리적 채널들에서 측정되었을 때 중지된다.here

Is the ScanDuration parameter value of the MLME-SCAN.request primitive and is an integer ranging from 0 to 14. The maximum ED measurements obtained during this ED scan period should be reported before moving to the next channel in the channel list. The ED scan is stopped when the number of stored channel ED measurements is equal to the maximum specified by the implementation, or when the energy is measured on each of the specified logical channels.

Active scanning allows a device to recognize a coordinator transmitting a Beacon frame within its POS (Personal Operating Space). This active scan can be used by a device that wants association before a future PAN coordinator or association to select an appropriate PAN ID before starting a new PAN.

During the scan period, the MAC sublayer shall discard all frames received through the physical layer data service rather than the beacon frame. For each logical channel, the device sends a Beacon Request Command.

심벌시간 동안 자신의 수신기를 활성화 한다. 이 기간 동안 디바이스는 모든 Non-beacon 프레임들을 거부하고, PAN descriptor 구조에 모든 고유의 Beacon들에 포함된 정보를 기록한다. Upon successful transmission of the Beacon Request Command, the device

Activate your receiver for symbol time. During this period, the device rejects all non-beacon frames and records the information contained in all unique beacons in the PAN descriptor structure.

When the beacon-enabled PAN coordinator receives a Beacon Request Command, it ignores it and continues to transmit its periodic beacons as usual. When a coordinator operating in a non-beacon-enabled PAN receives a beacon request command, the coordinator must transmit a beacon frame using an unslotted CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance).

Passive scanning allows the device to recognize the coordinator sending Beacon frames within its POS, such as Active Scan. The difference from the Active scan is that the Beacon Request Command is not sent.

This type of scan can be used by any device that wants an Association before the Association. During the scan period, the MAC sublayer shall discard all frames received through the physical layer data service rather than the beacon frame.

심벌시간 동안 자신의 수신기를 활성화한다. 이 기간 동안 디바이스는 모든 Non-beacon 프레임들을 거부하고, PAN descriptor 구조에 모든 고유의 Beacon들에 포함된 정보를 기록한다. For each logical channel, the device

Activate your receiver for symbol time. During this period, the device rejects all non-beacon frames and records the information contained in all unique beacons in the PAN descriptor structure.

As a result, it is difficult to passive scan when a device performs association in non-beacon-enabled PAN, and active scan is required, and passive scan is applicable only to beacon-enabled PAN.

The Orphan scan is used by the device to attempt to reset its coordinator after a loss of synchronization. During the scan period, the MAC sublayer shall discard all frames received through the physical layer data service, not the Coordinator realignment command frame.

For each logical channel, the device sends an Orphan notification command and simultaneously activates its receiver during the macResponseWaitTime symbol upon successful transmission.

When the device successfully receives the Coordinator realignment command within this time, the scan is terminated. When the coordinator receives the Orphan notification command, the MLME shall send the MLME-ORPHAN.indication primitive to the next higher layer.

The upper layer then searches its device list for confirmation of the inclusion of the device indicated by the primitive. When the record of the device is found, the upper layer sends a Coordinator realignment command to the Orphaned device using the MLME-ORPHAN.response primitive.

The process of searching for a device and sending a Coordinator realignment command should be done within the macResponseWaitTime symbol period. The Coordinator realignment command shall include its current PAN ID, macPANId , the current logical channel, the channel page, and the 16-bit Short Address of the Orphaned device.

If the upper layer of the coordinator does not find the record of the device, it ignores the MLME-ORPHAN.indication primitive and does not send the Coordinator realignment command. The Orphan scan must be terminated when the device receives the Coordinator realignment command or the specified logical channel set is scanned.

As mentioned above, when WPAN and WLAN use the same frequency band of 2.4 GHz, frequency collision may occur. In particular, in order to satisfy the requirements for minimizing the size and weight of each device of the WPAN and the operational convenience of the combat operations, it may become impossible to set the manual WPAN operation channel of the devices.

However, with the network formation method specified in the IEEE 802.15.4 protocol, it is impossible to solve the operating frequency collision problem between the two networks.

In order to overcome the problem of operating frequency collision in such a hybrid network structure, an efficient and smooth hybrid network forming technique using automatic operation channel setting algorithm of WPAN devices is required.

1. Korean Patent No. 10-1040218 2. Korean Patent Publication No. 10-2007-0029927

The present invention provides a method for forming an efficient network of WPAN devices in a hybrid network environment of WLAN and WPAN capable of forming a WPAN by efficient and smooth association, which is proposed in order to solve the problem raised in the above background art. It has its purpose.

It is another object of the present invention to provide an efficient network forming method of WPAN devices in a hybrid network environment of WLAN and WPAN capable of efficient and smooth association through automatic WPAN operation channel setting of devices.

Another object of the present invention is to provide an efficient network forming method of WPAN devices in a hybrid network environment of WLAN and WPAN which can minimize the size and weight of each device and increase the operational convenience of combat operations have.

It is still another object of the present invention to provide a storage device for storing program command codes for implementing an efficient network forming method of WPAN devices in a hybrid network environment of WLAN and WPAN as described above.

The present invention provides a method of forming an efficient network of WPAN devices in a hybrid network environment of WLAN and WPAN capable of forming a WPAN by efficient and smooth association in order to achieve the above-described problems.

The efficient network forming method includes:

A first sub-WPAN (Wireless Personal Area Network) having a first device and a first coordinator; a second device operating in the same operating frequency band as the first sub-WPAN; and a second sub-device having a third device and a second coordinator In a hybrid network environment of a WLAN and a WPAN including a first member having a WPAN and a WLAN (Wireless Local Area Network) connecting the two sub WPANs and a second member having the same WPANs except for the operating frequency, In an efficient network formation method of WPAN devices,

Manually selecting an operation channel of the first coordinator and the second coordinator that avoids the operation channel of the WLAN;

A WPAN communication generating step of generating a WPAN communication in a state in which the first coordinator and the second coordinator are coded with the PAN ID, the operation channel, and the short address;

Determining whether a first operation channel is set manually, determining whether a first operation channel of the first device, the second device, and a third device can be set manually; And

Forming a normal WPAN communication by performing association between one of the devices and one of the coordinators according to whether the operation channel is set manually; And a control unit.

At this time, in the step of determining whether to manually set the first operation channel, when the first operation channel of the devices can be manually set, the active scanning algorithm of the non-beacon mode is applied.

In addition, the devices perform active scanning only on one manually selected channel, and when performing an active scan, a destination PAN (Personal Area Network) ID of a beacon request command is applied to the coded PAN ID .

In addition, the destination address of the beacon request command may be a broadcast short address.

In addition, the destination address may be 0xffff.

In addition, the coding may be hard-coding.

In addition, a different PAN ID setting may be hard-coded for the coordinators.

Also, the coordinators may be configured to manually select a WPAN operation channel first, and to operate in a non-beacon-enabled mode.

In addition, in the communication forming step, the devices associate with a PAN descriptor-based coordinator of a beacon frame received during an active scan and set a MAC PIB (Personal Area Network Information Base) characteristic parameter, And the like.

In addition, the coordinators can manually select a channel from the beginning by avoiding a WLAN operation channel in operation, and have an operation function as a coordinator after power is applied.

In a case where it is impossible to manually set the first operation channel of the devices in the step of determining whether to manually set the first operation channel, a passive scanning algorithm of Half Beacon mode may be applied.

Here, the coordinators periodically transmit a beacon frame by applying an unslotted CSMA / CA / Collision Avoidance scheme.

The transmission period of the beacon frame may be determined in consideration of a passive scan period and a relative relation of the devices.

The period of the passive scan may be determined in consideration of the relative relationship of the beacon frame transmission periods of the coordinators.

In addition, each of the devices performs a passive scan on all the WPAN channels after power is applied.

In addition, each of the devices selects the association target coordinator of the device itself based on the PAN ID of the beacon frames received during the entire passive scan period and the PAN descriptor of the beacon frame having the highest link quality indicator (LQI) .

In addition, the devices perform association with the coordinator selected after setting the MAC PIB (Media Access Control Personal Area Network Information Base) property parameter.

The communication forming step may include determining whether to assign a short address to all the devices to be managed by the coordinator.

The size of the short address is 16 bits.

In addition, if it is determined that the coordinator does not assign a short address to all the devices to be managed, the beacon frame is periodically transmitted.

If the coordinator assigns a short address to all the devices to be managed as a result of the determination, the beacon frame is periodically stopped.

In addition, the WPAN forms a topology having a cluster tree structure, and operates in a non-beacon use mode.

The first device may be a voice transceiver, the first coordinator may be a communicator, the second coordinator may be a personal information processor, the second device may be an information input device, and the third device may be a bio- can do.

On the other hand, another embodiment of the present invention provides a storage medium for storing program instruction codes that implement a method for efficient network formation of WPAN devices in a hybrid network environment of WLAN and WPAN as described above.

According to the present invention, if a non-beacon mode active scanning algorithm is applied when WPAN devices can manually set an initial operation channel, it is possible to form WPANs through efficient and smooth association.

Another effect of the present invention is that if a passive scanning algorithm of Half Beacon mode is applied when the initial operation channel of WPAN devices can not be manually set, And a smooth association is possible.

Another advantage of the present invention is that efficient and smooth association is possible, so that the size and weight of each device can be minimized, and the operational convenience of combat operations can be increased.

1 is a diagram showing operation channels of a general 2.4 GHz band ZigBee WPAN and a WLAN.
FIG. 2 is a diagram illustrating a hybrid network system model in which a WPAN and a WLAN are combined according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a process of selecting a coordinator of a device in a passive scanning algorithm in a Half Beacon mode according to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating a process of forming a WPAN when the operation channel of the WPAN devices can not be set manually in the hybrid network structure according to the embodiment of the present invention.
FIG. 5 is a flowchart illustrating a process of forming a WPAN in a hybrid network structure according to another embodiment of the present invention, in which the operation channel of the WPAN devices can be manually set (a).

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Should not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an efficient network forming system and method of WPAN devices in a hybrid network environment of a WLAN and a WPAN according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a diagram illustrating a hybrid network system model in which a WPAN and a WLAN are combined according to an embodiment of the present invention. The system model for an embodiment of the present invention refers to a network system model in which a ZigBee WPAN and a WLAN in one member operate in a complex manner in a point-to-point environment as shown in FIG.

Referring to FIG. 2, the hybrid network system 200 includes a first WPAN 210 and a second WPAN 220.

The first WPAN 210 includes a communicator (or 'coordinator 1') 212 and a personal information processor (or 'coordinator 2') 213 serving as a coordinator and a voice transceiver (Hereinafter referred to as "device 1") 211, an information input device (or device 2) 214 and a bio-environmental sensor (or device 3) 215.

The coordinator 2 213, the device 2 214 and the device 3 215 constitute the first sub-WPAN 210-1 having the PAN ID = 1, And a second sub-WPAN 210-2 having PAN ID = 2.

Similarly, the second WPAN 220 may include a voice transceiver (or " coordinator 2 ") that acts as a device with a communicator (also referred to as a 'coordinator 1') 222 and a personal information processor (Hereinafter referred to as "device 1") 221, an information input device (or device 2) 224, and a bio-environmental sensor (or device 3)

The coordinator 1 222 and the device 1 221 constitute a first sub-WPAN 220-1 having PAN ID = 1 and the coordinator 2 223, the device 2 224 and the device 3 225 ) Constitute a second sub-WPAN 220-2 having PAN ID = 2.

2, a solid line arrow 201 indicates a data frame flow chart, and a dotted arrow 202 indicates a frame flow diagram other than a data frame such as a MAC Command frame and an ACK frame .

In addition, the coordinators 1 and 212 and the coordinators 2 and 213 are connected by an Ethernet line 203. The WPAN applied in FIG. 2 forms a topology having a cluster tree structure and operates in a non-beacon-enabled mode.

2, the voice data generated in the first device 211 of the first WPAN 210 corresponding to the member 1 is transmitted to the first WPAN 210 via the WLAN communication network 250 via the coordinator 1 212, Is received by the coordinator 1 222 of the second WPAN 220 corresponding to the member 2 and finally received by the device 1 221 of the second WPAN 220 through the WPAN.

The information input data transmitted from the second device 214 for control of the coordinator 2 213 requests an ACK (ACKnowledge) frame from the coordinator 2 213. [ Biometric sensor data including electrocardiogram and body temperature information of the member are transmitted from the third device 215 to the second coordinator 213 and request an ACK frame from the second coordinator 213. [

The coordinator 1 212 of the first WPAN 210 corresponding to the member 1 transmits the video, sensor and / or specialized data received from the coordinator 2 213 via the voice data and Ethernet to the member 2 To the first coordinator 1 (222) of the second WPAN (220). The coordinator 2 (213, 223) performs comprehensive functions such as map-based tactical data, specialty, and image and / or biometric information of other members.

In one embodiment of the present invention, an efficient hybrid network forming technique according to whether a WPAN device can manually select an operation channel in a hybrid network environment composed of WPAN and WLAN operating in the same frequency band is proposed.

Accordingly, it is assumed in FIG. 2 that the coordinators 1 and 212 and the coordinators 213 and 223 can manually select a WPAN operation channel first and operate in a non-beacon-enabled mode. Accordingly, two cases will be described.

(a) When the device's operation channel can be set manually (Active scan in Non-Beacon mode)

2, it is considered that the device 1 (211, 221), the device 2 (214, 224), and the device 3 (215, 225) can manually set the WPAN operation channel. Coordinators 1 and 212 and Coordinators 2 and 213 and 223 can manually select a channel from the beginning by avoiding a WLAN operation channel in operation and have an intention to operate as a coordinator after power is applied.

Since it is possible to manually select a channel, an ED (Energy Detection) scan is not required and a different PAN (Personal Area Network) ID setting can be hard-coded for the coordinators 1 and 212 and the coordinators 2 and 213 It does not.

And generates a PAN in a state in which the PAN ID, the operation channel, and the short address thereof are determined. The device 1 (211, 221), the device 2 (214, 224) and the device 3 (215, 225) can manually select the channel from the beginning by avoiding the WLAN operating channel in operation. ), And the device 2 (214, 224) and the device 3 (215, 225) have an intention to perform association with the coordinator 2 (213, 223).

The three devices perform active scanning only on one manually selected channel and the appropriate PAN ID setting for each of the devices can be hard-coded. Therefore, when performing an active scan, the beacon request command The destination PAN ID of the beacon request command is applied as a hard-coded PAN ID and the destination address is a broadcast short address 0xffff.

After setting the MAC PIB parameter based on the PAN descriptor extracted from the received beacon frame during the active scan, Association is performed to configure the WPAN.

(b) When the operation channel of the device can not be set manually (Passive scan in Half Beacon mode)

In this case, it is considered that the device 1 (211, 221), the device 2 (214, 224) and the device 3 (215, 225) can not manually set the WPAN operation channel in FIG. As described above, the coordinators 1 and 212 and the coordinators 2 and 213 perform operations to generate a WPAN in the same manner as in the case where manual configuration of the WPAN operation channel of the devices is possible.

When the WPAN is generated, the beacon frame periodic transmission is performed by the application layer processing, and the medium access control method uses the unslotted CSMA / CA. Here, the transmission period is determined in consideration of the passive scan period and the relative relationship of the device.

The device 1 (211,221), the device 2 (214,224), and the device 3 (215,225) are devices after power-on in the situation where manual selection of the first channel is impossible, The device 3 (215, 225) has an intention to perform association with the coordinator 2 (213, 223).

Each device performs a passive scan on the entire channel of the WPAN. The scan period considers the relative relationship of the beacon frame transmission periods of the coordinator 1 and the coordinator 2.

During the passive scan, the PAN is selected based on the list of PAN descriptors collected from the received Beacon frames, and the Association process is performed by setting the MAC PIB characteristic parameter.

Here, the PAN ID is hard-coded for each device, and the LQI (Link Quality Indicator) in the PAN descriptor is used to distinguish the beacon frame of the coordinator Beacon frame of the neighboring member having the same PAN ID as itself and the coordinator do.

A diagram showing this is shown in Fig. FIG. 3 is a diagram illustrating a process of selecting a coordinator of a device in a passive scanning algorithm in a half beacon mode according to an embodiment of the present invention.

Referring to FIG. 3, a PAN ID of the Beacon frame 310 and a PAN ID of the Beacon frame having the largest LQI among the received Beacon frames 310 and 311 during the entire passive scan period 301, 302, 303, And sets the MAC PIB characteristic parameter accordingly, and performs association with the selected coordinator (313, 315). Thus, the initial authentication is completed (317).

3, the coordinators 212 and 213 and the device 211 have been described by way of example. However, the present invention is similarly applied to the coordinators 222 and 223 and the device 221, and a description thereof will be omitted for the sake of clear understanding of the present invention do.

The processing contents of the coordinators 1 (212, 222) and the coordinators 2 (213, 223) are as follows.

Since the coordinators 1 and 212 and the coordinators 2 and 213, which are in the same network before the association of the devices 211, 221, 214, 224, 215 and 225, respectively, periodically transmit Beacon frames, traffic load may increase.

Accordingly, the coordinators 1 and 212 stop transmitting the beacon frame after receiving the ACK frame for the association response command (Association Response Command) for allocating a 16-bit short address to the device 1 (211 and 221). That is, the coordinators 1 and 212 stop transmission of the beacon frame after allocating one short address.

Coordinator 2 213 and 223 allocate a 16 bit short address to device 2 214 and 224 and device 3 215 and 225 respectively and stop transmission of a beacon frame after receiving an ACK frame for a second association response command. That is, after two short addresses are allocated, beacon transmission is stopped.

FIG. 4 is a flowchart illustrating a process of forming a WPAN when the operation channel of the WPAN devices can not be set manually in the hybrid network structure according to the embodiment of the present invention.

Referring to FIG. 4, the operation channel of the coordinator that avoids the WLAN operation channel is manually selected (step S400).

Accordingly, the coordinator generates the WPAN with the coded PAN ID, the operation channel, and the short address determined (step S410).

At this time, it is determined whether the operation channel setting of the devices is possible (step S420).

As a result of the determination, if the operation channel can not be manually set, the number (b) in the above-described case is executed.

The coordinator periodically transmits a beacon frame through an application layer process in consideration of a passive scan period of the device by applying an unslotted CSMA / CA (Collision Avoidance) / (Collision Avoidance) Step S430).

In response to the periodic transmission of the beacon frame, each device performs passive scanning of all WPAN channels after power is applied (step S440).

The association target coordinator of the device itself is selected based on the PAN descriptor of the Beacon frame having the same PAN ID and the largest LQI among the received Beacon frames during the entire passive scan period, (Steps S450 and S460).

Each coordinator confirms whether or not a short address has been assigned to all the devices to be managed by the coordinator (step S470).

As a result of checking, if address allocation is confirmed to all devices to be managed, the beacon frame transmission of the coordinator is stopped and a normal WPAN is formed (steps S480 and S490).

Otherwise, if it is determined in step S470 that address allocation to all the devices to be managed is not completed, steps S430 to S470 are repeated.

FIG. 5 is a flowchart illustrating a process of forming a WPAN in a hybrid network structure according to another embodiment of the present invention, in which the operation channel of the WPAN devices can be manually set (a).

Referring to FIG. 5, in step S420 of FIG. 4, if it is determined that manual operation channel setting is possible, the number (a) described above is executed.

By avoiding the WLAN operation channel, the devices perform the same manual channel selection as the coordinator (step S500).

Thereafter, the devices perform an active scan only on one manually selected channel (step S510).

At this time, a hard-coded PAN ID is applied to the destination PAN ID of the beacon request command and an address of the destination is a broadcast short address Short Address (0xffff) is applied (Step S520).

Performs binding based on the PAN descriptor of the received beacon frame during active scan, and forms a normal WPAN (steps S530 and S540).

In conclusion, the active scan algorithm of non-beacon mode is applied when the first operation channel of WPAN devices can be manually set in the non-beacon-enabled mode, If passive scanning algorithm of Half Beacon mode is applied, it is possible to form WPAN through efficient and smooth association in hybrid network environment combined with WLAN.

In particular, in the hybrid network environment of WLAN and WPAN according to an exemplary embodiment of the present invention, an efficient network formation method of WPAN devices is implemented in the form of program command codes that can be performed through various computer means, .

The computer-readable storage medium may include program instructions, data files, data structures, and the like, alone or in combination.

The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software.

Examples of computer-readable storage media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magneto-optical media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.

The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like.

Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

In addition, one embodiment of the present invention may be implemented in hardware, software, or a combination thereof. (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microprocessor, and the like, which are designed to perform the above- , Other electronic units, or a combination thereof.

In a software implementation, it may be implemented as a module that performs the functions described above. The software may be stored in a memory unit and executed by a processor. The memory unit or processor may employ various means well known to those skilled in the art.

200: Hybrid network system
210, 220: Wireless Personal Area Network (WPAN)
210-1, 220-1: first sub-WPAN
210-2, 220-2: second sub-WPAN
211,221: Device 1
212, 222: Coordinator 1
213,223: Coordinator 2
214,224: Device 2
215,225: Device 3

Claims (24)

A first sub-WPAN (Wireless Personal Area Network) having a first device and a first coordinator; a second device operating in the same operating frequency band as the first sub-WPAN; and a second sub-device having a third device and a second coordinator In a hybrid network environment of a WLAN and a WPAN including a first member having a WPAN and a WLAN (Wireless Local Area Network) connecting the two sub WPANs and a second member having the same WPANs except for the operating frequency, In an efficient network formation method of WPAN devices,
Manually selecting an operation channel of the first coordinator and the second coordinator that avoids the operation channel of the WLAN;
A WPAN communication generating step of generating a WPAN communication in a state in which the first coordinator and the second coordinator are coded with the PAN ID, the operation channel, and the short address;
Determining whether a first operation channel is set manually, determining whether a first operation channel of the first device, the second device, and a third device can be set manually; And
And establishing a normal WPAN communication by performing association between one of the devices and one of the coordinators according to whether the operation channel is set manually or not,
In the step of determining whether to manually set the first operation channel,
As a result of the determination whether or not the first operation channel is set manually, the active scan algorithm of the non-beacon mode is applied when the first operation channel of the devices can be set manually,
A passive scanning algorithm of a half beacon mode is applied when it is impossible to manually set the first operation channel of the devices as a result of the determination whether the first operation channel is manually set or not. A method for efficient network formation of WPAN devices in a wireless environment.
delete The method according to claim 1,
The devices perform active scanning only on one manually selected channel and apply a Destination PAN (Personal Area Network) ID of the beacon request command to their hard-coded PAN IDs when the active scan is performed Wherein the method comprises the steps of: a) establishing a connection between the WLAN and the WPAN;
The method of claim 3,
Wherein the destination address of the beacon request command is a broadcast short address. ≪ RTI ID = 0.0 > 8. < / RTI > 5. The method of claim 4,
Wherein the destination address is 0xffff. ≪ RTI ID = 0.0 > 11. < / RTI >
delete The method of claim 3,
Wherein a different PAN ID setting is hard-coded for the coordinators. ≪ RTI ID = 0.0 > 11. < / RTI >
The method according to claim 1,
Wherein the coordinators are initially capable of manually selecting a WPAN operation channel and are operated in a non-beacon-enabled mode.
The method according to claim 1,
The communication forming step includes:
Wherein the devices form a WPAN by performing a combination after setting a MAC PIB parameter with a PAN descriptor-based coordinator of a received beacon frame during an active scan, A Method for Efficient Network Formation of WPAN Devices in Hybrid Network Environment of WPAN.
The method according to claim 1,
Wherein the coordinators are capable of manually selecting a channel from the beginning by avoiding a WLAN operation channel in operation and have an operation function as a coordinator after power on.
delete The method according to claim 1,
Wherein the coordinators periodically transmit a beacon frame by applying an unslotted Carrier Sense Multiple Access (CSMA / CA) / (Collision Avoidance). In the hybrid network environment of WLAN and WPAN, / RTI >
13. The method of claim 12,
Wherein the transmission period of the beacon frame is determined in consideration of a passive scan period and a relative relation of the devices.
14. The method of claim 13,
Wherein the period of the passive scan is determined in consideration of a relative relationship of the beacon frame transmission period of the coordinators.
The method according to claim 1,
Wherein each of the devices performs passive scanning on all channels of the WPAN after power is applied.
The method according to claim 1,
Each of the devices selects the association target coordinator of the device itself based on the PAN ID of the beacon frames received during the entire passive scan period and the PAN descriptor of the beacon frame having the highest link quality indicator (LQI) A method of forming an efficient network of WPAN devices in a hybrid network environment of WLAN and WPAN.
17. The method of claim 16,
Wherein the devices perform association with the coordinator selected after setting the MAC PIB (Media Access Control Personal Area Network Information Base) property parameter.
The method according to claim 1,
Wherein the communication forming step includes the step of determining whether or not to assign a short address to all the devices to be managed by the coordinator,
If the coordinator does not allocate a short address to all the devices to be managed as a result of the determination of the allocation of the short address,
When the coordinator allocates a short address to all the devices to be managed as a result of the short address allocation decision, it stops the periodic transmission of the beacon frame. In the hybrid network environment of WLAN and WPAN, Way.
19. The method of claim 18,
Wherein the size of the short address is 16 bits. ≪ RTI ID = 0.0 > [10] < / RTI >
delete delete The method according to claim 1,
Wherein the WPAN forms a topology with a cluster tree structure and operates in a non-beacon use mode.
The method according to claim 1,
Wherein the first device is a voice transceiver, the first coordinator is a communicator, the second coordinator is a personal information processor, the second device is an information input device, and the third device is a biometric sensor. And a method of forming an efficient network of WPAN devices in a hybrid network environment of WPAN.
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