KR101404205B1 - Access Point and Control Method thereof - Google Patents

Abstract

The present invention relates to a local area wireless access apparatus and a method of controlling the same. The method of controlling the local area wireless access apparatus according to the present invention includes the steps of: determining whether a received packet is a real-time multimedia packet by comparing the received packet with previously stored information; extracting a class of at least one of transmitting and receiving terminals related to a corresponding packet from the previously stored information when the received packet is the real-time multimedia packet; and performing a determination and a process for a multimedia packet control according to QoS policy corresponding to the extracted terminal class.

Description

[Technical Field] The present invention relates to a short-range wireless access device and a control method thereof,

The present invention relates to a short-range wireless access device and a control method thereof, and more particularly to a short-range wireless access device for determining a multimedia packet and performing multimedia packet control according to a QoS policy corresponding to a pre- And a control method.

Recently, as the IP based communication is activated, not only voice communication but also various multimedia services are being performed by IP based communication.

In a device for performing wireless relay (e.g., a near LAN wireless access device), a QoS control for a MoIP service currently provided to a terminal is performed by a multimedia relay service (MoIP) It is necessary to detect whether the communication is MoIP communication first.

Conventionally, in order to detect a MoIP service, a method of analyzing a protocol of a SIP (Session Initiation Protocol) message generated at the start of communication of a corresponding MoIP service and detecting Real-time Transport Protocol (RTP) flow information has been used.

However, this conventional method can not be applied to a video streaming service that does not use SIP, and when an VoIP terminal using a SIP roams during a call, an Invite message of a SIP does not occur. There is a problem that the QoS function does not operate.

In addition, there is a limit to guarantee QoS for media streams because it can not detect VoIP calls based on SSL / TLS with enhanced security.

Also, in the prior art, quality is judged based on the RTP acceptance session number and the RTP delay limit, and the service quality deterioration occurring in the real service can not be reflected.

In addition, in the prior art, in order to guarantee the QoS for the real-time service, the transmission rate of the transmission unit is adjusted or the medium access control parameters such as Contention Windows Minimum size (CWMin), Contention Windows Maximum size (CWMax), Transmission Opportunity When the number of retransmissions according to the category is adjusted, when a plurality of terminals use a service of the same priority, there is a limit to various applications such as limiting the service of the terminal which reflects the inter-terminal class or degrades the quality.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned conventional problems, and its object is to provide a short-range wireless access device that correctly determines whether a packet is a multimedia packet, performs QoS control considering a class- Method.

In order to achieve the above object, a short-range wireless access apparatus according to the present invention includes: a packet receiver for receiving a packet according to communication; A database unit; A packet analyzing / processing unit for determining whether the packet received by the packet receiving unit is a real-time multimedia packet using pre-stored information; If the received packet is a real-time multimedia packet as a result of the determination by the packet analyzing / processing unit, the terminal extracts at least one of the transmitting terminal and the receiving terminal related to the packet using the information stored in the database unit, And a real-time multimedia service controller for performing a decision on the multimedia packet control according to the QoS policy corresponding to the star rating.

In order to achieve the above object, a method of controlling a near field wireless access device according to the present invention includes: comparing a received packet with pre-stored information to determine whether the packet is a real-time multimedia packet; If the received packet is a real-time multimedia packet, extracting a rating of each terminal of at least one of a transmitting terminal and a receiving terminal from the stored information; And performing the determination and processing for multimedia packet control according to the QoS policy corresponding to the extracted terminal class.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, QoS control can be performed differentially for multimedia packets in consideration of the terminal class.

In addition, according to the present invention, it is possible to quickly determine whether a terminal uses a real-time multimedia service by examining and analyzing characteristics of all packets transmitted / received by the terminal. That is, without using an analysis of the control signal of the SIP / SDP, whether the multimedia service is used or not can be confirmed by examining the characteristics of the packet.

In addition, when the real-time multimedia packet is not smoothly transmitted to the mobile station, quality of the entire wireless network can be guaranteed to a certain level or more by inducing or isolating the roaming considering the influence on the entire network and the signal strength of the mobile station.

1 is a schematic configuration diagram of an entire system including a short-range wireless access apparatus according to an embodiment of the present invention,
Fig. 2 is a functional block diagram of the short-range wireless access apparatus of Fig. 1,
3 to 8 are flowcharts of a control of the short-range wireless access apparatus according to an embodiment of the present invention,
9 is a diagram showing a state where a plurality of short range wireless contact devices according to the present invention are configured and a plurality of wireless terminals are also provided,
10 is an example of data stored in the signature DB 140. FIG.

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

An example of the entire system configuration including the short-range wireless access apparatus according to an embodiment of the present invention is shown in FIG.

As shown in the figure, the overall system includes a wireless terminal 200, a short-range wireless access device 100, a video streaming server 400, and an IP telephone 300.

The wireless terminal 200 communicates with the short-range wireless access point 100 through a short-range wireless LAN communication scheme (for example, a Wi-Fi scheme) and may correspond to a mobile phone, a smart phone, a PDA (Personal Digital Assistants) have.

IP phone 300 may be configured to be connected to IP-PBX 500 as shown in FIG. 2 as an opposite terminal that enables IP-based communication with wireless terminal 200.

The IP-PBX 500 (500) refers to a device that performs functions such as an existing exchange, on an IP-based basis, and performs call processing, signaling, and dial plans for IP-based calls.

That is, the IP-PBX 500 performs a function of processing call connection and release between the IP telephone 300 and the counterpart terminal (for example, the radio terminal 200), which is called call control or signaling control .

In order to form a call path between the IP telephone 300, a function of processing connection and maintenance to a corresponding call is required. This is called call routing, and the IP-PBX 500 also performs this call routing function.

The video streaming server 400 is a server for providing multimedia contents such as moving pictures to the wireless terminal 200, and may be a device for providing a video on demand (VOD) service, for example.

The short-range wireless access device 100 is connected to the communication network by enabling the wireless terminal 200 to wirelessly connect to the wireless LAN access point 100. The short-range wireless access device 100 is connected to a local wireless LAN access device such as an access point (AP) can do.

An example of a specific functional block of the short-range wireless access device 100 is shown in FIG.

As shown in the figure, the short-range wireless access apparatus 100 includes packet receiving units 162 and 171, packet transmitting units 161 and 172, a packet analyzing / processing unit 110, a real-time multimedia service controlling unit 120, A wireless quality measurement unit 180 for each terminal, and a database unit 130, and may further include a management control unit 190.

The packet receiving units 162 and 171 include a wired receiving unit 162 and a wireless receiving unit 171. The wired receiving unit 162 is connected to the wired network and receives IP packets And the wireless receiving unit 171 performs a function of receiving an IP packet transmitted from the wireless terminal 200. [

The packet transmission units 161 and 172 include a wired transmission unit 161 and a wireless transmission unit 172. The wired transmission unit 161 is connected to a wired network and transmits a predetermined IP packet And the wireless transmission unit 172 performs a function of transmitting a predetermined IP packet to the wireless terminal 200. [

The database unit 130 may include a signature DB 140 and a QoS DB 150. Here, the signature DB 140 is a database for storing characteristic information about real-time multimedia packets in order to promptly determine whether the packets received or transmitted are real-time multimedia packets, And provides it to the packet analysis / processing unit 110 as well.

The information included in the signature DB 140 may include a packet length, a packet interval, a packet characteristic, and the like for a multimedia packet, and may further include a configuration of an RTP header.

The QoS DB 150 is a database for storing various kinds of information about a service session per terminal related to QoS (Quality of Service) policy and QoS guarantee for the service of the WLAN access device 100, Class, packet priority, etc., and acts as a database for real-time multimedia service by terminal.

In particular, in the QoS DB 150, a priority level for a terminal and a priority level for a packet are differentiated services code point (IP DSCP), a source IP address, a destination IP address, a TCP / UDP (Transfer Control Protocol / User Datagram Protocol) And the priorities between the classes and the packet priorities are set in advance. Based on these pieces of information, the real-time multimedia service controller 120, which will be described later, determines various types of multimedia services .

The terminal-specific radio quality measuring unit 180 collects information on the transmission quality and the radio environment of each radio terminal 200 from the radio transmitting unit 172 and the radio receiving unit 171 and transmits the collected information to the real-time multimedia service controller 120, And the quality is guaranteed according to the priority of the multimedia service and the class of the terminal according to the function.

The transmission quality of the wireless terminal 200 collected from the wireless reception unit 171 and the wireless transmission unit 172 is determined based on the strength of the latest signal (radio frame) transmitted from the wireless terminal 200 and the transmission speed (I.e., transmission rate) and a retransmission rate, a transmission failure rate, and an actual wireless band occupancy rate of a real-time multimedia service packet (a wireless frame) transmitted to the wireless terminal 200. [

The wireless QoS control unit 173 controls the wireless transmission unit 172 according to a command of the real-time multimedia service control unit 120. Specifically, the wireless OSS control unit 173 controls the back-off according to the access category defined in IEEE 802.11. the multimedia service of the wireless terminal 200 can be controlled by adjusting the media access parameter value used for calculating the backoff time, adjusting the wireless transmission rate (i.e., transmission rate) for each terminal, or adjusting the maximum number of retransmission of the wireless packet, Or the access category of packets transmitted by the wireless terminal 200 may be changed to a general best effort or back ground service instead of a real time multimedia service, thereby lowering the priority and affecting the service of other wireless terminals And minimizes the size of the image.

The packet analysis / processing unit 110 determines whether the received packet is a real-time multimedia packet using the pre-stored information.

Specifically, the packet analyzing / processing unit 110 analyzes packets transmitted from the wireless terminal 200 to an external server (for example, the video streaming server 400) or a correspondent terminal (for example, the IP telephone 300) And determines whether the packet is a real-time multimedia packet received from the wireless receiving unit 171, and stores the result in the database unit 130 directly or through the real-time multimedia service controller 120.

When the packet transmitted from the streaming server or the IP telephone 300 is received through the wired receiver 162, the packet analyzing / processing unit 110 transmits the packet analysis result to the wireless terminal 200. The packet analysis result is also transmitted directly or through a real- And is stored in the database unit 130 through the control unit 120.

In determining whether the packet is a multimedia packet, the packet analyzing / processing unit 110 checks whether the received packet is a UDP packet periodically received, and if the received packet is a periodically received UDP packet, And if it is determined that the corresponding packet has a predetermined size range, it can be determined as a multimedia packet.

The packet analysis / processing unit 110 not only receives the currently received packet, but also information on previous packets related to the packet (i.e., , The characteristics of packets related to the same session (packet size, packet reception period, etc.)) to determine whether the corresponding packet is a multimedia packet.

As another example, if the received packet is a UDP packet periodically received and has a predetermined range size, the packet analyzing / processing unit 110 determines whether the multimedia service having the predetermined period and the corresponding period is already registered If it is determined that the corresponding multimedia service is already registered, it may extract the packet verification information matched with the previously registered multimedia service, and may determine whether the corresponding packet is a multimedia packet using the extracted packet verification information.

For example, if the UDP packet is received at intervals of 10 ms as a result of analyzing the characteristics of the received packet and the size of the UDP packet is 100 bytes, the packet analysis / processing unit 110 determines that the multimedia service satisfying such conditions is stored in the database unit 130 If the multimedia service satisfying the above-mentioned conditions is registered as a result of the search, a packet verification method matched to the retrieved multimedia service (for example, whether or not a specific byte of the packet is set to a specific value To determine whether the packet is a multimedia packet.

If the packet analyzing / processing unit 110 determines that the received packet is a real-time multimedia packet, the packet analyzing / processing unit 110 determines a multimedia service corresponding to the packet and transmits multimedia service information corresponding to the determined multimedia service ) From a database or the like and transmits the same to the real-time multimedia service controller 120.

If the received packet is a real-time multimedia packet, the real-time multimedia service controller 120 determines at least one of the transmitting terminal and the receiving terminal related to the received packet as a database 130, and performs a function of determining a multimedia packet control according to a QoS policy corresponding to the extracted terminal class.

More specifically, the real-time multimedia service control unit 120 receives the packet classified as the real-time multimedia service in the packet analysis / processing unit 110 and extracts information about the terminal using the packet (transmitting or receiving) And the statistics related to the quality such as the bandwidth used and the transmission delay are updated in the database unit 130 for the sessions already registered.

In addition, when the multimedia service information is received from the packet analysis / processing unit 110, the real-time multimedia service control unit 120 determines a priority corresponding to the received multimedia service information, And may perform the determination of the multimedia packet control according to the QoS policy corresponding to the multimedia packet.

In addition, the real-time multimedia service control unit 120 receives information on the transmission quality transmitted from the terminal-specific radio quality measurement unit to the terminal unit 130 in accordance with the QoS policy preset in the database unit 130, And performs a function of controlling QoS for each terminal 200.

If it is determined that the multimedia service used by a particular terminal deteriorates the wireless quality, the real-time multimedia service controller 120 may induce roaming of the wireless terminal 200. [ At this time, the real-time multimedia service control unit 120 may induce roaming of the wireless terminal 200 by reporting to a predetermined external controller server (for example, the AP controller 103) through a management / control unit described later.

As a specific example, the real-time multimedia service controller 120 determines that the transmission rate of the radio frame is less than a preset value as a result of measurement by the terminal-specific radio quality measuring unit 180, The control unit 110 can generate a roaming request signal and control the roaming request signal to be transmitted to the external controller server 103. [

As another example, when direct communication between the local area wireless access points 100 is possible, the real-time multimedia service controller 120 may control the generated local area wireless access points 100 to transmit / receive the generated roaming request signals.

The management controller 190 requests the external control server 103 or another local wireless access device to perform roaming according to the roaming request signal of the real-time multimedia service controller 120 described above.

For example, the management control unit 190 communicates with an external control server (for example, the AP controller 103) and transmits a predetermined request signal or receives a predetermined control signal. The QoS policy may be changed according to a request of the AP controller 103 or a request may be sent to the local wireless access point 100 such as the current multi-media service state and the wireless LAN quality by requesting roaming of the wireless terminal 200 through interworking, It is possible to report various kinds of information to the AP controller 103.

Hereinafter, the control process of the packet analysis / processing unit 110 described above with reference to FIG. 3 will be described in more detail.

The packet analyzing / processing unit 110 receives the packet from the wired / wireless receiving unit 171 (step S1) and inquires whether the session related to the packet is already registered in the real-time multimedia service controlling unit 120 (step S3 ).

The packet analysis / processing unit 110 refers to the response from the real-time multimedia service control unit 120 and, if the session related to the relevant packet is registered (step S5), the packet analysis / processing unit 110 determines whether or not the corresponding packet is discarded (Step S15).

Here, the packet analysis / processing unit 110 may determine whether the packet is discarded in the QoS policy according to a response received from the real-time multimedia service control unit 120, or directly refer to the information stored in the database unit 130 You can judge by yourself. At this time, the information that the packet analysis / processing unit 110 refers to in the database unit 130 includes at least one of the transmitting terminal (for example, the wireless terminal 200) and the receiving terminal (for example, the IP telephone 300) Information about a QoS policy corresponding to the class of each terminal and the class of each terminal, and the like.

The packet analysis / processing unit 110 discards the packet (step S19). If it is determined in step S19 that the packet discard is not required in the QoS policy, the packet analysis / 110 requests the real-time multimedia service controller 120 to update the session information on the packet (step S17). At this time, the updated session information may include information on the size, type, and characteristics of the corresponding packet.

After the session information is updated as described above, the packet analysis / processing unit 110 transfers the packet to the wired / wireless transmission unit 172 to be transmitted to the reception terminal (step S13).

On the other hand, if it is determined in step S5 that the session related to the packet has not been registered, the packet analysis / processing unit 110 compares the packet contents with the information stored in the database unit 130 (in particular, the signature DB 140) (Step S7) and determines whether it is a real-time multimedia packet. A more specific example of the determination as to whether or not the packet is a real-time multimedia packet will be described later.

If the packet is a real-time multimedia packet (step S9), the packet analysis / processing unit 110 requests the real-time multimedia service controller 120 to register a session for the packet (step S11).

Then, the packet analysis / processing unit 110 transmits the packet to the wired / wireless transmission unit 172 to be transmitted (step S13).

Hereinafter, a detailed process of determining whether the packet is a real-time multimedia packet mentioned in step S9 will be described with reference to FIG.

The packet analysis / processing unit 110 determines whether the received packet is a UDP packet (step S21). For example, the packet analysis / processing unit 110 may check the header of the packet to determine whether the packet is a UDP packet. Unlike TCP, UDP is a connectionless protocol, and it has a characteristic that there is no connection establishment such as a handshake and therefore packet overhead is small.

If it is determined to be a UDP packet (step S21), the packet analysis / processing section 110 performs a packet reception history check (step S23). For example, the packet analysis / processing unit 110 confirms to the database unit 130 the history in which other packets related to the packet are received. Here, the relevance of the packets can be confirmed based on the session information using the destination address and the port, the source address, and the port.

If it is determined that there is a periodicity in the reception of the packet (step S25), for example, if it is determined that the packets related to the packet are being received in a predetermined time interval, the packet analysis / For example, whether the related packets all have the same size) (step S27).

As a result of the determination, if the length of the packet is constant (step S27), the signature DB 140 storing the information on the multimedia service is retrieved using the length and the period of the packet (step S29).

If a matching service among services stored in the signature database 140 is found (step S31), the packet analysis / processing unit 110 attempts packet verification using the signature DB 140 information (step S33). The packet verification scheme may be matched for each multimedia service. For example, packet verification may be performed by checking whether a specific byte of the packet is incremented by a predetermined value.

If the packet verification is passed (step S35), the packet analysis / processing unit 110 determines the packet as a multimedia packet (step S37).

If the matching service is not found in step S31 or the packet verification is not passed in step S35, the packet analysis / processing unit 110 performs log recording on the database unit 130 for improving the signature DB 140 S39). The content of the log record may include the contents of the packet period, the packet length, the packet characteristics, the content that is inconsistent with the service stored in the signature DB 140, or the entire contents of the packet.

When these log records are stored, the administrator can check or modify the log records to check the cases that are not properly determined in spite of the multimedia packets, and change or add the packet verification methods stored in the signature DB 140. [

An example of a packet length, a packet interval, a packet verification method, etc. for each service stored in the signature DB 140 is as shown in FIG.

Hereinafter, a detailed control process of the real-time multimedia service controller 120 will be described with reference to FIGS. 5 to 8. FIG.

A process of determining whether each session is a registered session will be described with reference to FIG.

When receiving a packet inquiry request from the packet processing / analysis unit (that is, a inquiry request about whether or not the packet is registered) (step S41), the real-time multimedia service controller 120 determines whether the session related to the packet is registered (Step S43).

For example, the real-time multimedia service control unit 120 checks whether the source IP address and the port number included in the packet match the destination IP address and the port number and is registered in the database unit 130, It can be determined whether the related session is registered.

If it is determined that the session related to the packet is not registered (step S43), the real-time multimedia service controller 120 responds to the packet processing / analysis unit with the 'unregistered session' (step S49).

If the session associated with the packet is already registered (step S43), the real-time multimedia service control unit 120 determines whether it is necessary to discard the corresponding packet according to the QoS policy (step S45).

For example, when the real-time multimedia service controller 120 considers the class of each terminal and exceeds the transmission amount per predetermined unit time, the real-time multimedia service controller 120 may determine the discard of the packet.

More specifically, the real-time multimedia service control unit 120 determines whether to discard the inquired packet considering the degree of each terminal, the priority of the multimedia service, and the total wireless service quality reported from the per-terminal wireless quality measurement unit 180 Information to be transmitted to the wired / wireless transmitting unit 172 may be included in the response to the packet processing / analyzing unit.

That is, since the transmission amount and the transmission rate of each packet are continuously registered in the database unit 130 by the real-time multimedia service controller 120 or the packet analysis / processing unit 110, the real-time multimedia service controller 120 It is possible to refer to such session information and determine whether to discard the packet according to the QoS policy of each terminal.

If it is determined in step S45 that the packet discard is necessary (step S45), the real-time multimedia service control unit 120 responds to the packet processing / analysis unit with 'packet discard' (step S51) (Step S45) The real-time multimedia service control unit 120 responds to the packet processing / analysis unit with 'packet delivery' (step S47).

The process of transmitting or discarding the corresponding packet in the packet processing / analyzing unit according to each response of the real-time multimedia service controller 120 is as described above.

Next, with reference to FIG. 6, a process of registering a session related to a packet will be described.

When the session information registration request is received from the packet processing / analyzing unit (step S71), the real-time multimedia service controlling unit 120 registers the corresponding packet as a multimedia service session (step S73).

One multimedia service session is uniquely determined by the IP address of the originating terminal and the IP address of the other terminal, that is, the destination terminal or the predetermined server, the protocol (UDP or TCP), the port number used by each terminal, Lt; / RTI >

When the multimedia service session information is registered as described above, when a packet is received from the wired / wireless receiving unit 162/171, it can be confirmed whether it is a packet for the already registered session.

Then, the real-time multimedia service controller 120 can set the session priority to the wireless QoS controller 173 (step S75). To this end, the real-time multimedia service control unit 120 may extract the QoS policy information for each terminal from the database unit 130, and use the extracted QoS policy information to determine a processing policy for the corresponding session (for example, Priority for packets, etc.) to the wireless QoS control unit 173.

Hereinafter, the process of updating the session information will be described with reference to FIG.

When the request for updating the session information is received from the packet processing / analyzing unit (step S81), the real-time multimedia service controller 120 may update the previously registered session information, and may also update the entire used bandwidth S83).

That is, the real-time multimedia service control unit 120 processes the session information update request according to the requested packet transmission before the packet processing / analysis unit transmits the packet to the wired / wireless transmission unit 172. Specifically, the real-time multimedia service control unit updates the session information such as the packet length and the bandwidth of the delivery point and the propagation delay time, and updates the bandwidth information of the current multimedia service being serviced.

After the update of the session information, the real-time multimedia service controller 120 reflects the bandwidth limitation in the per-terminal QoS policy (step S85) to the session information (step S87) The processing policy for the session is updated (step S89). For example, the real-time multimedia service control unit 120 instructs the wireless QoS control unit 173 to prioritize the packets related to the session.

If it is determined in step S85 that bandwidth limitation is not necessary on the QoS policy, the real-time multimedia service control unit 120 determines whether the session information needs to be changed (step S86). If it is necessary to change the session information, (Step S87) and instructs the wireless QoS control unit 173 to update (step S89).

That is, when the real-time multimedia service controller 120 needs to limit the bandwidth in a certain session due to the QoS policy or deterioration of the quality of the wireless LAN after updating the session information, the real-time multimedia service controller 120 reflects the session information, parameter to change the QoS-related setting of the wireless QoS control unit 173.

Next, another example in which the session information is updated will be described with reference to FIG.

When the quality measurement result is received from the terminal-specific radio quality measurement unit 180 (step S91), the real-time multimedia service control unit 120 updates the session information and overall QoS information of the currently managed terminal to include the corresponding quality measurement result Step S93).

The real-time multimedia service control unit 120 then reflects the fact in the session information stored in the database unit 130 (step S97), and then the wireless QoS control unit 173 (Step S99).

9 is a diagram illustrating a state in which a plurality of short range wireless contact devices (i.e., APs) for assuring the quality of multimedia services according to the present invention and a plurality of wireless terminals 200 are also present.

The AP-1 101 and the AP-1 102 are adjacent to each other and under the control of the AP controller 103 to form a wireless LAN network, and they are in a state of eliminating the influence of interference by using different channels.

The wireless terminal-1 201 can perform a multimedia service, for example, a VOIP voice call with the AP-1 101 through the wired network. At this time, the AP-1 101 detects RTP packets between the UE-1 201 and the counterpart terminal and generates session information for the real-time multimedia service.

The AP-1 101 can update the session information if an RTP packet exchanged for a predetermined period (for example, 20 ms period) is found between the UE-1 201 and the counterpart UE. In addition to the period, the AP-1 101 can update the session information related to the packet if the various conditions described above such as the packet size are satisfied.

Meanwhile, the terminal-2 202 performs a VoIP voice call with another counterpart terminal, and the AP-1 101 that detects RTP packets during the terminal-2 202 and the counterpart terminal also generates a multimedia session. When the UE-2 202 moves to the border area of the service range of the AP-1 101 while maintaining voice communication, the wireless communication between the AP-1 101 and the UE-2 202 is not smooth, The rate of the wireless frame of the UE-2 202 increases and the wireless service quality of the UE-1 201 decreases due to the increase of the rate of transmission of the wireless frame.

This information is reported to the real-time multimedia service controller 120 in the terminal-specific radio quality measuring unit 180 of the AP-1 101 and the real-time multimedia service controller 120 reports the APs of the wired network through the management controller 190. [ And makes a roaming request for the terminal-2 202 to the controller 103. [

The AP controller 103 instructs the AP-1 101 to disconnect from the terminal-2 202 through the management control unit 190 of the AP-1 101 and instructs the AP- 2 202 to smoothly provide a voice call service between the other terminal and the terminal-2 202 through real-time roaming, and at the same time, the quality of the real-time multimedia service of the AP- Can be guaranteed.

The terminal-3 (203) is an example of a terminal that receives a movie from a video streaming server (400) through a VoD service and allows the user to view the movie. At this time, the AP-2 102 confirms and analyzes a real-time video streaming packet (RTP / sRTP or UDP) regardless of a protocol for video selection between the terminal-3 203 and the VoD server, Information can be generated and QoS of the VoD stream can be guaranteed.

Needless to say, the process of performing each of the above-described embodiments can be performed by a program stored in a predetermined recording medium (for example, a computer readable medium).

The present invention is not limited to the above-described specific embodiments, and various modifications and changes may be made without departing from the gist of the present invention. It is to be understood that such variations and modifications are intended to be included in the scope of the appended claims.

100, 101, 102: short-range wireless access device
200, 201, 202, 203: wireless terminal
300: IP telephone 400: Video streaming server
500: IP-PBX 110: Packet analysis /
120: Real-Time Multimedia Service Control Unit
130: Database part 140: Signature DB
150: QoS DB 161: wired transmission section
162: wire receiving unit 171: wireless receiving unit
172: radio transmission unit 180: radio quality measurement unit for each terminal
190: management control unit 173: wireless QoS control unit
103: AP controller

Claims (11)

delete A packet receiving unit receiving a packet according to communication;
A database unit;
A packet analyzing / processing unit for determining whether the packet received by the packet receiving unit is a real-time multimedia packet using pre-stored information;
If the received packet is a real-time multimedia packet as a result of the determination by the packet analyzing / processing unit, the terminal extracts at least one of the transmitting terminal and the receiving terminal related to the packet using the information stored in the database unit, And a real-time multimedia service controller for determining a multimedia packet control according to a QoS policy corresponding to a star rating,
The packet analyzing / processing unit checks whether the packet received by the packet receiving unit is a UDP packet periodically received. If the UDP packet is a periodically received UDP packet, the packet analyzing / processing unit determines whether the packet has a predetermined range size And determines that the packet is a multimedia packet if the packet has a predetermined size range. A packet receiving unit receiving a packet according to communication;
A database unit;
A packet analyzing / processing unit for determining whether the packet received by the packet receiving unit is a real-time multimedia packet using pre-stored information;
If the received packet is a real-time multimedia packet as a result of the determination by the packet analyzing / processing unit, the terminal extracts at least one of the transmitting terminal and the receiving terminal related to the packet using the information stored in the database unit, And a real-time multimedia service controller for determining a multimedia packet control according to a QoS policy corresponding to a star rating,
The packet analyzing / processing unit determines whether the multimedia service having the predetermined period and the corresponding period is already registered if the corresponding packet is a UDP packet periodically received and has a predetermined range size, and if the corresponding multimedia If the service is already registered, extracts packet verification information matched with the previously registered multimedia service, and determines whether the packet is a multimedia packet using the extracted packet verification information. A packet receiving unit receiving a packet according to communication;
A database unit;
A packet analyzing / processing unit for determining whether the packet received by the packet receiving unit is a real-time multimedia packet using pre-stored information;
If the received packet is a real-time multimedia packet as a result of the determination by the packet analyzing / processing unit, the terminal extracts at least one of the transmitting terminal and the receiving terminal related to the packet using the information stored in the database unit, And a real-time multimedia service controller for determining a multimedia packet control according to a QoS policy corresponding to a star rating,
Wherein the packet analyzing / processing unit determines a multimedia service corresponding to the packet if the received packet is a real-time multimedia packet, and transmits the multimedia service information corresponding to the determined multimedia service to the real-time multimedia service controller,
The real-time multimedia service control unit determines a priority corresponding to the multimedia service information received from the packet analyzing / processing unit, and determines whether to control the multimedia packet according to the determined priority and the QoS policy corresponding to the extracted terminal- To the wireless LAN access point. A packet receiving unit receiving a packet according to communication;
A database unit;
A packet analyzing / processing unit for determining whether the packet received by the packet receiving unit is a real-time multimedia packet using pre-stored information;
If the received packet is a real-time multimedia packet as a result of the determination by the packet analyzing / processing unit, the terminal extracts at least one of the transmitting terminal and the receiving terminal related to the packet using the information stored in the database unit, A real-time multimedia service controller for determining a multimedia packet control according to a QoS policy corresponding to a star rating;
A wireless quality measurement unit for each terminal for measuring a wireless quality of each terminal including at least one of a transmission rate of a wireless frame and a wireless channel occupancy rate,
Wherein the real-time multimedia service control unit determines that the transmission rate of the radio frame is less than a preset value as a result of measurement by the terminal-specific radio quality measurement unit, and when the occupancy rate of the radio channel of the terminal exceeds a predetermined value, And generates a request signal to be transmitted to an external controller server. delete (a) comparing a received packet with pre-stored information to determine whether it is a real-time multimedia packet;
(b) if the received packet is a real-time multimedia packet, extracting a rating of at least one of the transmitting terminal and the receiving terminal for the packet from the stored information;
(c) performing determination and processing for multimedia packet control according to a QoS policy corresponding to the terminal-specific class extracted in the step (b)
The step (a)
(a1) checking whether the received packet is a UDP packet periodically received;
(a2) determining whether the packet has a predetermined range size in case of a UDP packet periodically received as a result of the checking in step (a1);
(a3) determining that the packet is a multimedia packet if the packet has a predetermined size range as a result of the determination in step (a2). (a) comparing a received packet with pre-stored information to determine whether it is a real-time multimedia packet;
(b) if the received packet is a real-time multimedia packet, extracting a rating of at least one of the transmitting terminal and the receiving terminal for the packet from the stored information;
(c) performing determination and processing for multimedia packet control according to a QoS policy corresponding to the terminal-specific class extracted in the step (b)
The step (a)
(a4) if the received packet is a UDP packet periodically received and has a predetermined size range, determining whether the multimedia service having the predetermined period and the corresponding period is already registered;
(a5) if the corresponding multimedia service is already registered as a result of the checking in step (a4), extracting packet verification information matched with the previously registered multimedia service;
(a6) determining whether the packet is a multimedia packet using the packet verification information extracted in the step (a5). (a) comparing a received packet with pre-stored information to determine whether it is a real-time multimedia packet;
(b) if the received packet is a real-time multimedia packet, extracting a rating of at least one of the transmitting terminal and the receiving terminal for the packet from the stored information;
(c) performing determination and processing for multimedia packet control according to a QoS policy corresponding to the terminal-specific class extracted in the step (b)
If the received packet is a real-time multimedia packet, determining a multimedia service corresponding to the packet;
Further comprising the step of extracting multimedia service information corresponding to the determined multimedia service,
In step (c), a priority corresponding to the multimedia service information is determined, and the multimedia packet control is determined according to the determined priority and the QoS policy corresponding to the class extracted by the step (b) Wherein the short-range radio access device is a radio communication device. (a) comparing a received packet with pre-stored information to determine whether it is a real-time multimedia packet;
(b) if the received packet is a real-time multimedia packet, extracting a rating of at least one of the transmitting terminal and the receiving terminal for the packet from the stored information;
(c) performing determination and processing for multimedia packet control according to a QoS policy corresponding to the terminal-specific class extracted in the step (b)
(d) measuring a wireless quality of each terminal including at least one of a transmission rate of a wireless frame and a wireless channel occupancy rate;
(e) generating a roaming request signal when the rate of the radio frame becomes less than a predetermined value as a result of the measuring in the step (d), and the occupation rate of the wireless channel of the terminal becomes equal to or greater than a preset value; And the control information is transmitted to the external controller server. A computer-readable recording medium recording a program for executing the method of any one of claims 7 to 10.

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