KR20090004244A - Management method of wireless network - Google Patents

Abstract

A wireless network management method is provided to determine whether to process event request frames according to whether stations requesting frame transmission are the same, and a question and answer token, an event token and an event request included in the event request frame. A request station transmits the first event request frame(S110). A report station starts processing the first event request frame(S115), and then receives/starts processing the second event request frame from the same request station(S120, S125). If the processing of the first event request frame is completed, the report station transmits the first event report frame for the first event request frame to the request station(S130), and then if the processing of the second event request frame is completed, transmits the second event report frame for the second event request frame to the request station(S140).

Description

Management method of wireless network

The present invention relates to a wireless network, and more particularly, to a wireless network management method capable of real-time diagnostics of a wireless network system.

Recently, with the development of information and communication technology, various wireless communication technologies have been developed. Among them, wireless LAN (Wireless Local Area Network) is a technology that enables wireless high-speed Internet access in homes, businesses, or specific service providing areas by using portable terminals such as PDAs and notebook computers based on radio frequency technology.

Since the Institute of Electrical and Electronics Engineers (IEEE) 802, a standardization body for wireless LAN technology, was established in February 1980, a number of standardization tasks have been performed. Early wireless LAN technology used the 2.4 GHz frequency through IEEE 802.11 to support speeds of 1 to 2 Mbps for frequency hopping, spread spectrum, infrared communication, etc. Can support the speed of. In addition, IEEE 802.11 improves Quality for Service (QoS), access point protocol compatibility, security enhancement, radio resource measurement, and wireless access vehicular environment. Standards of various technologies such as, fast roaming, mesh network, interworking with external network, and wireless network management are being put into practice.

Wireless network management is a technology for simple network management protocol (PNMP) that can manage the state of the network in a simple manner, and active research is being conducted recently. As a method of real-time diagnosis of a network state in PNMP, there is a method of exchanging an event request frame and an event report frame between stations. One station transmits an event request frame to check the network status of another station to which it is connected and maintains an appropriate connection state. The station receiving the event request frame receives the event type (required by the event request frame). Responds to the latest event element through an event report frame according to an event type).

One station may connect with multiple stations and receive multiple event request frames from one or multiple stations. The event request frame and the event report frame contain question and answer tokens to specify event requests and reports. When receiving one event request frame and receiving a new event request frame with another question and answer token before processing is complete, the station only responds to the most recently requested request frame. That is, if another event request frame is received before the processing of one event request frame is completed, the processing of the event request frame is stopped.

The state of the network can vary between a number of stations, the events that a station can experience, and various events can occur, and stations can be placed in various situations for event requests and reporting. If the station responds only to the most recently requested event request frame, it may not respond appropriately to various situations and smooth wireless network management may not be achieved. For example, if a station with bad intentions continues to send a new event request frame to another station, that station will not be able to handle event requests from another station.

In addition, the station may receive one event request frame and receive an event request frame having the same question and answer token before processing is completed, and there is no clear description on how to process the event request frame.

Accordingly, there is a need for a method for smoothly managing a wireless network in response to various situations of a network.

An object of the present invention is to provide a wireless network management method for smooth network management in response to various situations of the network as appropriate.

The wireless network management method according to an embodiment of the present invention comprises the steps of receiving a second event request frame before the event report for the first event request frame is completed and a first question and answer token included in the first event request frame ( dialog token) and adaptively responding according to whether the second question and answer token included in the second event request frame is the same.

According to another aspect of the present invention, there is provided a method for managing a wireless network, the method including receiving a first event request frame, receiving a second event request frame while processing the first event request frame, and receiving the first event request frame. If the source station is different from the source station of the second event request frame, continuing to process the first event request frame and transmitting an event report frame for the first event request frame.

It is possible to determine whether to process the event request frame according to whether or not the requesting station transmitting the event request frame is identical, the question and answer token included in the event request frame, the event token, and the event request. Wireless network management can be achieved.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a simplified illustration of a wireless network system.

1, a wireless network system includes at least one basic service set (BSS). The basic service set is a concept including one station in a service area of one station (STA) and another station connected to the station. A BSS that forms a self-contained network without accessing a distribution system is called an IBSS (Independent BSS). The station included in the BSS may be a mobile station or a fixed station.

A mobile station used by a user may be referred to in other terms, such as a user terminal (UT), a user equipment (UE), a subscriber station (SS), a wireless device, and the like. The mobile station can communicate with other mobile stations or fixed stations. The fixed station may be widely deployed for data services such as voice and video, which may be an access point (AP), a base station (BS), a node-B, a base transceiver system Or other terms). The stationary station may communicate with a mobile station or another stationary station. The fixed station may be connected with wide area networks (WAN).

The plurality of BSSs may be interconnected through a distribution system. Among the stations included in the BSS, a station connecting to the distribution system becomes an access point (AP). A plurality of BSSs connected through a distribution system is called an extended service set (ESS). Stations included in the ESS may communicate with each other, and a mobile station may continuously communicate while moving from one BSS to another within the same ESS.

For example, BSS 1 includes STA 1 and STA 2, and BSS 2 includes STA 3, STA 4, and STA 5. BSS 1 may be an IBSS. STA 2 and STA 5 may be access points that can connect to the distribution system. BSS 1 and BSS 2 may connect to the distribution system through each access point and form one ESS. Once the ESS is formed, STA 1 to STA 5 can communicate with each other.

In the wireless network system, for real-time diagnostics of the network, stations periodically or periodically exchange an Event Request frame and an Event Report frame. The event request frame and the event report frame include transition related information, Robust Security Network Association (RSNA) related information, peer-to-peer related information, and system log related information.

2 shows the structure of an event request frame.

2, an event request frame is used for one station to request reporting of one or more events to another station. The event request frame includes a Category field, an Action field, a Dialog Token field, and an Event Request Elements field.

The category field indicates that the frame belongs to a wireless network management category. For example, the category field may have a size of one octet. The action field indicates that the frame is an event request frame and may have, for example, a size of one octet. The question and answer token field serves to identify the frame exchange between stations. The question and answer token field is a field into which a value selected by the station sending the event request is inserted in order to confirm the event request / report processing, and may have a size of, for example, one octet. The event request element field is a field that includes one or more event request elements and may vary in size. The event request element contains a request for a designated event action that the station is responsible for. The size of the event request element field and the number of event request elements included therein are limited within a set size of medium access control (MAC) management protocol data unit (MMPDU).

The event request element may include an element ID field, a length field, an event token field, an event type field, an event request field, and the like.

In the element ID field, an ID value indicating an event request element is inserted among various information elements. The length field may have various values according to the length of the event request field. The event token field represents a unique value between the event request element and the corresponding event reporting element. The event type field indicates the type of event request. Table 1 shows an example of an event request type.

The event request field includes an event request corresponding to the event type. Event requests included in the event request fields include Transition Event Requests, RSNA Event Requests, Peer-to-Peer Link Event Requests, and System Log Requests. (Syslog) Request). Each event request may include a number of sub elements. The size of the event request field may be '0' (zero). That is, the event request field may not be included in the event request frame.

3 illustrates the structure of an event report frame.

3, an event report frame is used to respond to an event request frame. The event report frame includes a Category field, an Action field, a Dialog Token field, and an Event Report Elements field.

The category field indicates that the frame belongs to a wireless network management category. For example, the category field may have a size of one octet. The action field indicates that the corresponding frame is an event report frame and may have, for example, a size of one octet. The question and answer token field is a field into which a value corresponding to the event request frame is inserted, and may have a size of one octet, for example. The event report element field is a field that includes one or more event report elements and may vary in size. The size of the event report element field and the number of event report elements included therein are limited within the set MMPDU size.

Event reporting elements include the Element ID field, Length field, Event Token field, Event Type field, Status field, Event Timestamp field, and Event. It may include an event report field and the like.

In the element ID field, an ID value indicating an event report is inserted from various information elements. The length field may have various values according to the length of the event report field. The event token field indicates an event token corresponding to the event request element. The event type field indicates the type of event report. Table 2 shows an example of event reporting types.

The status field indicates the station's response to the event request indicated by the question and answer token. Responses to event requests include 'Successful', 'Fail', 'Refused', and 'Incapable'. The event timestamp field indicates a timing synchronization function (TSF) timer value of the station where the event is recorded. The event report field includes an event report corresponding to the event type. The event reports included in the event reporting fields include Transition Event Report, RSNA Event Report, Peer-to-Peer Link Event Report, and System Log Report. (Syslog) Report). The event timestamp field and the event report field may be provided when the size of the status field is '0', that is, omitted.

Hereinafter, a method of diagnosing and managing a state of a wireless network in real time using an event request frame and an event report frame will be described. A station for transmitting an event request frame is called a requesting station, and a station for transmitting an event report frame is called a reporting station. The requesting station may be an access point (AP), and the reporting station may be a non-access point station (Non-AP STA). Alternatively, in the IBSS, the requesting station and the reporting station may be non-AP STAs. However, this is not a limitation, and even if the requesting station and the reporting station become an AP or a non-AP STA, the wireless network management method according to the present invention may be applied as it is.

4 is a flowchart illustrating a method for managing a wireless network according to an embodiment of the present invention. This is the case where consecutive event request frames with different question and answer tokens are received from the same request station.

Referring to FIG. 4, the request station transmits a first event request frame (S110). It is assumed that the question-and-answer token (D-Token) included in the first event request frame is '1'.

The reporting station which has received the first event request frame starts processing (first processing) of the first event request frame (S115). The reporting station stores event information about transition events, RSNA events, peer-to-peer link events, and system log events after being connected to one AP in the ESS. The reporting station may store up to five recent event information for each event type. The reporting station generates an event report frame according to the type and number of events requested in the event request frame among the stored event information. Sending the created event report frame completes the processing of the event request frame.

The reporting station may receive a second event request frame from the same requesting station while processing the first event request frame (S120). Assume that the question and answer token included in the second event request frame is '2'. The reporting station compares the question and answer token included in the first event request frame with the question and answer token included in the second event request frame. If the question and answer token included in the first event request frame and the question and answer token included in the second event request frame are not the same, the reporting station continues without stopping processing of the first event request frame.

Then, the process (second process) of the second event request frame is started (S125).

When the processing of the first event request frame is completed, the reporting station transmits the first event report frame for the first event request frame to the requesting station (S130). The first event report frame may include the same question and answer token as the first event request frame, and may include information corresponding to the event element requested by the first event request frame.

When the processing of the second event request frame is completed, the reporting station transmits the second event report frame for the second event request frame to the request station (S140). The second event report frame may include the same question and answer token as the second event request frame, and may include information corresponding to the event element requested in the second event request frame.

In summary, if a STA receive Event Request frame with different Dialog Tokens from same requesting STA, the STA shall respond orderly to the all requests).

5 is a flowchart illustrating a method for managing a wireless network according to another embodiment of the present invention. This is a case where event request frames having the same question and answer tokens are continuously received from the same requesting station.

Referring to FIG. 5, the request station transmits a first event request frame (S210). It is assumed that the question-and-answer token (D-Token) included in the first event request frame is '1'.

The reporting station which has received the first event request frame starts processing (first processing) of the first event request frame (S215). The reporting station generates an event report frame according to the type and number of events requested in the event request frame among the stored event information.

The reporting station may receive a second event request frame from the same requesting station while processing the first event request frame (S220). Assume that the question and answer token included in the second event request frame is '1'. The reporting station compares the question and answer token included in the first event request frame with the question and answer token included in the second event request frame. If the question and answer token included in the first event request frame and the question and answer token included in the second event request frame are the same, the reporting station stops processing the first event request frame.

Then, processing (second processing) of the second event request frame is started (S225).

When the processing of the second event request frame is completed, the reporting station transmits a second event report frame for the second event request frame to the request station (S230). The second event report frame may include the same question and answer token as the second event request frame, and may include information corresponding to the event element requested in the second event request frame.

In summary, if a subsequent event request frame with the same question and answer token is received from the same requesting station before the event report is completed from the previous request, the station responds only to the most recent request (If a STA receives a subsequent Event Request frame). with a same Dialog Token from a same requesting STA before the Event Report from a previous request has been completed, the STA shall respond only to the most recent request).

6 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention. This is the case when event request frames are received from different request stations.

Referring to FIG. 6, the first request station X transmits a first event request frame (S310). Assume that the question and answer token (D-Token) included in the first event request frame is 'A'.

The reporting station that has received the first event request frame starts processing (first processing) of the first event request frame (S315). The reporting station generates an event report frame according to the type and number of events requested in the event request frame among the stored event information.

The reporting station may receive the second event request frame from the second request station Y while processing the first event request frame (S320). Assume that the question-and-answer token included in the second event request frame is 'B'. The first request station and the second request station are different source stations. If a second event request frame is received from a requesting station different from the requesting station that transmitted the first event request frame, the reporting station continues without stopping processing of the first event request frame. In this case, the question and answer token included in the first event request frame and the question and answer token included in the second event request frame may be the same or different, but the reporting station may include the question and answer token and the second event request frame included in the first event request frame. There is no need to compare the question and answer tokens contained in the.

Then, processing (second processing) of the second event request frame is started (S325).

When the processing of the first event request frame is completed, the reporting station transmits the first event report frame for the first event request frame to the request station (S330).

When the processing of the second event request frame is completed, the reporting station transmits the second event report frame for the second event request frame to the request station (S340).

In summary, if a STA receive Event Request frame from different requesting STA, the STA shall respond orderly to the all requests).

7 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention. This is the case where consecutive event request frames are received from the same request station with different question and answer tokens and do not include an event request field.

Referring to FIG. 7, the request station transmits a first event request frame (S410). It is assumed that the question-and-answer token (D-Token) included in the first event request frame is '1'.

The reporting station which has received the first event request frame starts processing (first processing) of the first event request frame (S415). The reporting station generates an event report frame according to the type and number of events requested in the event request frame among the stored event information.

The reporting station may receive a second event request frame from the same request station while processing the first event request frame (S420). It is assumed that the second event request frame includes '2' as the question and answer token and does not include an event request field. The reporting station compares the question and answer token included in the first event request frame with the question and answer token included in the second event request frame. If the question and answer token included in the first event request frame and the question and answer token included in the second event request frame are different from each other, the reporting station checks the event request field of the second event request frame. If the event request field is not included in the second event request frame, the reporting station stops processing the first event request frame. The reporting station does not perform processing for the second event request frame. That is, the second event request frame serves to stop processing of the first event request frame.

In summary, if a subsequent event request frame is received from the same requesting station with a different question and answer token and does not have an event request field before the event report is completed, the station stops responding to the request. a subsequent Event Request frame with different Dialog Token and no Event Request field from a same requesting STA before the Event Report from a previous request has been completed, the STA shall stop responding to the request).

8 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention. This is the case where consecutive event request frames including different question and answer tokens and different event tokens are received from the same requesting station.

Referring to FIG. 8, the request station transmits a first event request frame (S510). The first event request frame is assumed to include '1' as the question and answer token (D-Token), '1, 2, 3' as the event token, and '0, 1, 2' as the event type. That is, the first event request frame includes three event request elements whose event types are transition events, RSNA events, and peer-to-peer link events.

The reporting station that has received the first event request frame starts processing (first processing) of the first event request frame (S515). The reporting station generates an event reporting frame by processing information about transition events, RSNA events, and peer-to-peer events that it has, depending on the event type.

The reporting station may receive a second event request frame from the same requesting station while processing the first event request frame (S520). It is assumed that the second event request frame includes '2' as the question and answer token, '4 and 5' as the event token and '1 and 2' as the event type. That is, the second event request frame includes two event request elements whose event type is RSNA event, peer-to-peer link event. The reporting station compares the question and answer token included in the first event request frame with the question and answer token included in the second event request frame. If the question and answer token included in the first event request frame and the question and answer token included in the second event request frame are different from each other, the reporting station stops processing the first event request frame.

The reporting station starts processing (second processing) of the second event request frame (S525). The second event report frame is generated by processing the latest information on the RSNA event and the peer-to-peer event corresponding to the event type of the second event request frame.

When the processing of the second event request frame is completed, the reporting station transmits the second event report frame for the second event request frame to the request station (S530). The second event report frame may include '2' as a question and answer token, '4 and 5' as an event token, and '1 and 2' as an event type.

In summary, if a subsequent event request frame with the same answering token and different event token is received from the same requesting station before the event report is completed from the previous request, the station only responds to the most recent request (If a STA receives). a subsequent Event Request frame with a same Dialog Token and different Event Token from a same requesting STA before the Event Report from a previous request has been completed, the STA shall respond only to the most recent request).

9 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention. This is the case where consecutive event request frames including event tokens overlapping the same question and answer tokens are received from the same requesting station.

Referring to FIG. 9, the request station transmits a first event request frame (S610). The first event request frame is assumed to include '1' as the question and answer token (D-Token), '1, 2, 3' as the event token, and '0, 1, 2' as the event type. That is, the first event request frame includes three event request elements whose event types are transition events, RSNA events, and peer-to-peer link events.

The reporting station that has received the first event request frame starts processing (first processing) of the first event request frame (S615). The reporting station generates an event report frame by processing information about transition events, RSNA events, and peer-to-peer link events that it has according to the event type.

The reporting station may receive a second event request frame from the same requesting station while processing the first event request frame (S620). It is assumed that the second event request frame includes '1' as the question and answer token, '2 and 3' as the event token, and '1 and 2' as the event type. That is, the second event request frame includes two event request elements in which the first event request frame and the event token are duplicated and the event type is an RSNA event or a peer-to-peer event. The reporting station compares the question and answer token included in the first event request frame with the question and answer token included in the second event request frame. If the question and answer token included in the first event request frame and the question and answer token included in the second event request frame are the same, the reporting station determines the event token included in the first event request frame and the event token included in the second event request frame. Compare with each other. The event request element corresponding to the duplicate event token in the event token included in the first event request frame and the event token included in the second event request frame stops processing in the first event request frame and processes in the second event request frame. do. That is, RSNA events and peer-to-peer link events, which are event types corresponding to duplicate event tokens '2 and 3', stop at the first event request frame, and transitions that are event types corresponding to non-overlapping event token '1' Only events continue to be processed in the first event request frame.

The reporting station starts processing (second processing) of the second event request frame (S625). Process the latest information on the RSNA event and the peer-to-peer link event corresponding to the event type of the second event request frame.

When the reporting station completes processing of the first event request frame and the second event request frame, the reporting station requests an event reporting frame including all event types corresponding to the event token included in the first event request frame or the second event request frame. It transmits to the station (S630). The event report frame may include '1' as a question and answer token, '1, 2 and 3' as an event token, and '0, 1 and 2' as an event type.

10 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention. This is the case where consecutive event request frames including the same question and answer token and different event tokens are received from the same requesting station.

Referring to FIG. 10, the request station transmits a first event request frame (S710). The first event request frame is assumed to include '1' as the question and answer token (D-Token), '1, 2, 3' as the event token, and '0, 1, 2' as the event type. That is, the first event request frame includes three event request elements whose event types are transition events, RSNA events, and peer-to-peer link events.

The reporting station that has received the first event request frame starts processing (first processing) of the first event request frame (S715). The reporting station generates an event report frame by processing information about transition events, RSNA events, and peer-to-peer link events that it has according to the event type.

The reporting station may receive a second event request frame from the same requesting station while processing the first event request frame (S720). It is assumed that the second event request frame includes '1' as the question and answer token, '4' as the event token, and '3' as the event type. That is, the second event request frame includes one event request element that is different from the first event request frame and the event token, and whose event type is a system log event. The reporting station compares the question and answer token included in the first event request frame with the question and answer token included in the second event request frame. If the question and answer token included in the first event request frame and the question and answer token included in the second event request frame are the same, the reporting station determines the event token included in the first event request frame and the event token included in the second event request frame. Compare with each other. Since the event token included in the first event request frame and the event token included in the second event request frame do not overlap, the reporting station processes both the first event request frame and the second event request frame.

The reporting station starts processing (second processing) of the second event request frame (S725). Process the latest information on the system log event corresponding to the event type of the second event request frame.

When the reporting station completes processing of the first event request frame and the second event request frame, the reporting station includes a second event report frame including all event types corresponding to the event token included in the first event request frame or the second event request frame. To the requesting station (S730). The second event report frame may include '1' as the question and answer token, '1, 2, 3 and 4' as the event token, and '0, 1, 2 and 3' as the event type.

In summary, if a STA receive Event Request frame with same Dialog Tokens from same requesting STA, the STA shall respond to the all requests).

Although the present invention has been described above with reference to the embodiments, it will be apparent to those skilled in the art that the present invention may be modified and changed in various ways without departing from the spirit and scope of the present invention. I can understand. Therefore, the present invention is not limited to the above-described embodiment, and the present invention will include all embodiments within the scope of the following claims.

1 is a simplified illustration of a wireless network system.

2 shows the structure of an event request frame.

3 illustrates the structure of an event report frame.

4 is a flowchart illustrating a method for managing a wireless network according to an embodiment of the present invention.

5 is a flowchart illustrating a method for managing a wireless network according to another embodiment of the present invention.

6 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention.

7 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention.

8 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention.

9 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention.

10 is a flowchart illustrating a wireless network management method according to another embodiment of the present invention.

Claims (9)

Receiving a second event request frame before event reporting for the first event request frame is completed; And And adaptively responding according to whether the first dialogue token included in the first event request frame is identical to the second dialogue token included in the second event request frame. The method of claim 1, wherein if the first question and answer tokens are the same, the event report for the first event request frame is stopped and the event report for the second event request frame is processed. How to manage your wireless network. The event token of claim 1, wherein when the first question and answer tokens are the same, the event token included in the first event request frame corresponds to the same event token as the event token included in the second event request frame. The event report is processed in the event report for the second event request frame, the wireless network management method. The event token of claim 1, wherein when the first question and answer tokens are the same, an event token different from an event token included in the second event request frame is included in the event token included in the first event request frame. And the event report is processed in the event report for the first event request frame. The method of claim 1, wherein if the first question and answer tokens are different, event reporting for the first event request frame is continued. 6. The method of claim 5, wherein both the event report for the first event request frame and the event report for the second event request frame are processed. The method of claim 1, wherein when the first question and answer tokens are different and the event request field is not included in the second event request frame, the event reporting for the first event request frame is stopped. Wireless network management method characterized in that. Receiving a first event request frame; Receiving a second event request frame while processing the first event request frame; And If the source station of the first event request frame is different from the source station of the second event request frame, continuing to process the first event request frame and transmitting an event report frame for the first event request frame. Network management method. 10. The method of claim 8, further comprising transmitting an event report frame for the second event request frame.

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