KR101707416B1 - METHOD AND SYSTEM FOR CONTROLLING QoS FOR DATA BROADCASTING SERVICE IN WIRELESS LAN AND ACCESS POINT THEREFOR - Google Patents

Abstract

The present invention relates to a transmission rate control method and system for a data broadcasting service in a wireless LAN, and an access point for the same. More particularly, the present invention relates to a method and system for analyzing a type of a packet received at an access point, When a received packet is a broadcasting / multicasting packet, the packet is received by adjusting a predetermined transmission rate according to the packet amount of the received packet. Quality video information and a large number of data broadcasting services that require a large bandwidth can be provided by transmitting a packet to a plurality of terminals in a broadcasting / multicasting manner.

Description

TECHNICAL FIELD [0001] The present invention relates to a QoS control method and system for a data broadcasting service in a wireless LAN, and an access point for the same. BACKGROUND ART [0002]

The present invention relates to a data broadcasting service using multicasting / broadcasting. More particularly, the present invention relates to a method and apparatus for receiving data packet data from a broadcast service apparatus for providing broadcast data to a subscriber station via a wireless LAN, A QoS control method and system for a data broadcasting service in a wireless local area network (WLAN) capable of guaranteeing quality of service (QoS) of broadcast traffic by sequentially assigning priority to each port according to a predetermined priority, Point.

2. Description of the Related Art Generally, a wireless LAN (WLAN) is an access point (AP) corresponding to a hub of a wired LAN and provides a LAN service to a wireless terminal such as a smart phone or a notebook equipped with a wireless LAN card Network environment. It can be considered that the wired section between the hub and the user terminal in the conventional Ethernet system is replaced with the wireless section between the access point and the NIC (Network Interface Card) such as the wireless LAN card.

Meanwhile, recently, a data broadcasting service for transmitting the same advertisement and information image to a plurality of user terminals in a public place such as a coffee shop, a large discount mart, an airport, a department store and a hotel through a wireless LAN is provided.

The access point transmits a multicasting / broadcasting packet for a data broadcasting service at a rate that can be processed by all user terminals connected thereto. The access point transmits a multicast / broadcast packet through a Basic Service Set (BSS) Basic Rate Set determined by the IEEE 802.11 standard And selects and transmits a receivable data transmission rate.

However, since the access point selects and transmits the lowest speed that all user terminals can receive and process, there is a problem that quality of service is degraded in providing high-quality video information and a large number of data broadcasting services requiring a large bandwidth.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above problems, and it is an object of the present invention to provide a method and apparatus for providing differentiated QoS according to a multicasting / broadcasting packet to guarantee a certain level of QoS even when a large amount of broadcast traffic occurs, A QoS control method and system for a data broadcasting service in a wireless LAN, and an access point therefor.

According to a first aspect of the present invention, there is provided a system for providing a broadcast service to a plurality of user terminals through a wireless LAN, A broadcast service apparatus for transmitting the broadcast service; And an access point for receiving a broadcast packet from the broadcast service apparatus and assigning a priority to a broadcast packet according to a port number of the received broadcast packet to transmit the broadcast packet to the user terminal according to the given priority. do.

According to a second aspect of the present invention, an access point according to the present invention includes: a packet interface unit for receiving a packet; A packet analyzer for analyzing a packet received through the packet interface and determining a packet type; And a packet-specific QoS controller for differentiating QoS according to a port number of the broadcasting / multicasting packet when the type of the packet is a broadcasting / multicasting packet.

According to a third aspect of the present invention, there is provided a QoS control method for a data broadcasting service in a wireless LAN, the method comprising: (a) receiving a packet from outside; (b) analyzing the received packet to determine the type of packet; (c) differentially adjusting QoS according to a port number of a broadcasting / multicasting packet when the type of the received packet is a broadcasting / multicasting packet; And (d) transmitting the received packet to the user terminal in a broadcasting / multicasting manner according to the differentiated QoS.

According to the present invention, a priority is allocated to an access point in accordance with an IP port of a broadcast / multicasting packet, which is transmission data, and is input to a queue corresponding to a priority. The quality of the transmission service can be ensured through differentiated QoS application even if excessive broadcast traffic occurs.

This makes it possible to efficiently provide high-quality video information or a large number of data broadcasting services requiring a large bandwidth.

Brief Description of the Drawings Fig. 1 is a diagram illustrating a configuration of a QoS control system for a data broadcasting service in a wireless LAN according to an embodiment of the present invention.
2 is a block diagram showing the configuration of an access point according to an embodiment of the present invention;
3 is a flowchart illustrating a QoS control method for a data broadcasting service in a wireless LAN according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The configuration of the present invention and the operation and effect thereof will be clearly understood through the following detailed description. Before describing the present invention in detail, the same components are denoted by the same reference symbols as possible even if they are displayed on different drawings. In the case where it is judged that the gist of the present invention may be blurred to a known configuration, do.

Referring to FIG. 1, a system according to an embodiment of the present invention may include a broadcast service apparatus 100, an access point (AP) 300, and a plurality of user terminals 400.

A system according to an embodiment of the present invention is characterized in that a broadcast packet is transmitted via an access point 300 when a broadcast packet is transmitted to a plurality of user terminals 400 through the broadcast service apparatus 100. [

The broadcast service apparatus 100 for this purpose transmits broadcast packets to a plurality of user terminals 400 through a network-based communication network 200. Here, the broadcast packet may be encoded in various formats including MPEG-1, MPEG-2, MPEG-4, and H.264.

The communication network 200 refers to a network that provides a service by communicating between the broadcasting service apparatus 100 and a plurality of user terminals 400 by wired / wireless communication. The communication network 200 is connected to the access point 300 so that a plurality of use terminals 400 can receive a broadcast packet from the broadcast service apparatus 100 through the access point 300 to provide. The broadcast service apparatus 100 and the access point 300 may be directly connected to each other without the communication network 200 although the broadcast service apparatus 100 and the access point 300 are connected through the communication network 200 have. If the broadcast service apparatus 100 and the access point 300 exist in the local area, the communication network 200 may be omitted.

The access point 300 is installed in an area such as a hot spot and is connected to the communication network 200 through a wireless LAN such as Bluetooth or Wi-Fi. In the embodiment of the present invention, it is assumed that the access point is connected to the wireless LAN through Wi-Fi unless otherwise mentioned.

The access point 300 receives a broadcast packet from the broadcast service apparatus 100 or the communication network 200, analyzes the received broadcast packet to check the type of the packet, and differentially controls QoS adjustment for each port. In this embodiment, the QoS adjustment uses a method of ensuring the quality of traffic by allocating a predetermined priority according to the port number of the packet and transmitting the priority according to the priority.

The packet received from the broadcasting service apparatus 100 is a multicasting / broadcasting packet, and the packet received from the communication network 200 may be a unicasting packet. The type of such a packet can be identified by using the IP address or the port number of the packet.

Accordingly, if the received packet is a unicasting packet, the access point 300 checks the type of the packet and transmits the packet to the plurality of user terminals 400 through the unicasting method through the existing transmission process, and broadcasts / multicasts If the packet is a packet, priority is assigned according to the port number of the packet. For this purpose, the access point 300 can construct a mapping table in which a priority to be given according to the port number of the packet is set in advance.

Accordingly, the access point 300 extracts and assigns the priority mapped to the port number of the broadcasting / multicasting packet in the mapping table, and transmits the priority to the plurality of user terminals 400 according to the given priority.

For example, if the port number of the broadcasting / multicasting packet is 1991, priority 1 is assigned. If 1992, priority 2 can be assigned. Alternatively, if the port number of the broadcast / multicasting packet grouping the port numbers is 1991 to 1995, priority 1 is assigned, and if the port numbers are 1996 to 2000, the priority number 2 may be assigned.

A plurality of user terminals 400 receive a broadcast packet from the broadcast service apparatus 100 through the access point 300 and reproduce the received broadcast packet. In such a plurality of user terminals 400, terminals located within a certain radius where one access point 300 is located are provided with the same broadcasting service.

The user terminal 400 according to the embodiment of the present invention can be applied to any type of terminal provided that a LAN card capable of interfacing with the access point 300 can be interposed and a broadcast packet can be reproduced. For example, a mobile terminal, a PDA, a notebook, a navigation, a PMP, a smart phone, an electronic dictionary, and an MPS.

2 is a block diagram showing the configuration of an access point according to an embodiment of the present invention.

The access point 300 according to the embodiment of the present invention includes a packet interface 310, a packet analyzer 320, a packet-specific QoS controller 330, To the user terminal 400 of the mobile station 200. [

The packet interface unit 310 accesses the communication network 200 of FIG. 1 to receive packets from the broadcasting service apparatus 100 or from the outside, and transmits the received packets to the plurality of user terminals 400 through the wireless LAN. At this time, the method of transmitting to the plurality of user terminals 400 can be set according to the type of the packet. That is, in the case of broadcasting / multicasting, the packet is transmitted to a plurality of user terminals (400 in FIG. 1) in a broadcasting or multicasting manner, and when a packet is a unicasting packet, 400).

The packet analyzing unit 320 analyzes the packet received through the packet interface unit 310 and determines the type of the received packet as a broadcasting / multicasting packet or a unicasting packet. This determination can be made using the IP address or port number of the packet.

The per-packet QoS control unit 330 differentiates QoS adjustment for each port by assigning a priority to the broadcasting / multicasting packet analyzed by the packet analyzing unit 320 according to the port number. The separating unit 331, A priority control unit 333, a queue storage unit (Queue) 335, a scheduler 337, and the like.

The separator 331 separates broadcast packets according to the priority to be allocated. That is, broadcast packets can be separated by port number using a mapping table in which a port number of each broadcast packet and a priority assigned to the port number are mapped.

The priority control unit 333 assigns priority to broadcast packets separated by the separator 331 and inputs the received broadcast packets to the queues Q1, Q2 and Q3 corresponding to the priorities. That is, if the priority is five-level in total, there are five queues, and broadcast packets having priority assigned thereto are input to the corresponding queue.

The queue storage unit 335 includes a plurality of queues, and a priority order is assigned to each queue.

The scheduler 337 sequentially extracts the broadcast packets input to the queue storage unit 335 based on the schedule transmitted in accordance with the priority assigned to the queue storage unit 335, starting from a queue having a higher priority.

Although the existing scheduler controls the scheduling operation by first-in first-out method for a broadcast packet input in one queue, the scheduler 337 of the present invention can not transmit a broadcast packet, And first-out the queue according to the priority to be transmitted first.

Therefore, the access point 300 according to the embodiment of the present invention assigns transmission priorities for respective queues using the queue storage unit 335 and transmits differentiated QoS Can be applied.

A method for differentially controlling QoS according to a packet using the access point 300 configured as described above will be described with reference to FIG.

Referring to FIG. 2, the access point 300 receives packets from the outside through the packet interface unit 310, that is, from the broadcast service apparatus or the communication network (S100).

The access point 300 analyzes the packet received by the packet analyzing unit 320 and determines the type of the packet (S110).

As a method of determining the type of a packet, an IP address or a port number of the received broadcast packet can be used. For example, when the IP address is x.x.x.255 in the header field of the received broadcast packet, it can be confirmed that the packet is a broadcasting / multicasting packet by checking '255' which is the end of the IP address.

In addition, when the channel is identified by the port number, the type of the broadcast packet can be confirmed using the port number. Generally, a packet is received at port number 23 in the case of telnet, and a packet is received at port number 21 in the case of FTP. Thus, if, for example, 1988 is set to the port number at which the broadcast packet is received, The mobile station 200 can recognize a packet received at port number 1988 as a broadcasting / multicasting packet.

In the exemplary embodiment of the present invention, since broadcast packets are given priority, a plurality of port numbers can be used for broadcast packets. For example, if the port number from 1988 to 1990 is set to the port number at which the broadcast packet is received, the access point 200 can recognize the packet received at any one of 1988 to 1990 as a broadcasting / multicasting packet have. In this case, priority 1 is assigned to 1988, priority 2 is assigned to 1989, and priority 3 is assigned to 1990.

If the received packet is a unicasting packet, the packet analyzing unit 320 transmits the received packet to a plurality of user terminals in a unicasting manner. If the received packet is a broadcasting / multicasting packet, (S120) according to the port number of the packet.

Thereafter, the access point 300 assigns a priority to be mapped to the port number using the mapping table previously set in the separated broadcast packet, and inputs the priority to the corresponding queue according to the given priority order (S130, S140).

Thereafter, the access point 300 selects a broadcasting packet for each high-priority queue through the scheduler 337 and transmits the broadcast packet to a plurality of user terminals in a broadcasting / multicasting manner (S150).

In the meantime, the present invention can be applied to various playback apparatuses by implementing the above-described packet-based QoS control method in a software program and recording it on a computer-readable recording medium.

The various playback devices may be a mobile terminal, a PDA, a notebook, a navigation, a PMP, a smart phone, an electronic dictionary, an MPS, and the like as the user terminal described above.

For example, the recording medium may be a hard disk, a flash memory, a RAM, a ROM, or the like embedded in each reproduction apparatus, or an external optical disk such as a CD-R or a CD-RW, a compact flash card, a smart media, have.

In this case, the program recorded on the computer-readable recording medium includes the steps of: receiving a packet from outside externally as described above; Analyzing the received packet to determine the type of packet; Differentially adjusting QoS according to a port number of a broadcasting / multicasting packet when the type of the received packet is a broadcasting / multicasting packet; And transmitting the received packet to the user terminal in a broadcasting / multicasting manner according to the differentiated QoS.

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

According to the present invention, a priority is given to a broadcast / multicast packet in an access point according to a port number, and de-queues are applied to a corresponding queue, so that a large amount of packet traffic is generated, Quality video information and a plurality of data broadcasting services that require high-quality video information. In this respect, it is not only the use of the related technology but also the possibility of commercialization or operation of the applied device, as it exceeds the limit of the existing technology.

100: broadcasting service apparatus 200: communication network
300: Access point 400: Multiple user terminals
310: Packet Interface Unit 320: Packet Analysis Unit
330: per-packet QoS control unit 331:
333: priority control unit 335: queue storage unit
337: Scheduler

Claims (10)

A broadcast service apparatus for transmitting a broadcast packet; And
Receiving a broadcast packet from the broadcast service apparatus, assigning a priority to a broadcast packet according to a port number of the received broadcast packet, selecting a queue corresponding to a priority of the broadcast packet among a plurality of queues to which a priority is assigned, And an access point for sequentially transmitting broadcast packets input to the queue having a higher priority among the plurality of queues to the user terminal
And a QoS control system for a broadcast service in a wireless LAN. A packet interface for receiving a packet;
A packet analyzer for analyzing a packet received through the packet interface and determining a packet type; And
And a packet-specific QoS controller for differentially adjusting QoS according to a port number of the broadcasting / multicasting packet when the type of the packet is a broadcasting / multicasting packet,
Wherein the per-packet QoS control unit comprises:
A separator for separating the broadcasting / multicasting packet according to a port number;
A queue storage unit configured with a plurality of queues and having a priority assigned to each queue;
A priority controller for assigning priority to broadcast / multicasting packets separated by the separator according to the port number and for inputting the broadcast / multicasting packet having the priority to the queue corresponding to the priority; And
A scheduler for extracting broadcasting / multicasting packets input to the queue storage unit according to a priority order;
And an access point. 3. The method of claim 2,
Wherein the packet analyzer analyzes an IP address or a port number of the received packet to analyze the packet type. delete 3. The method of claim 2,
Further comprising a mapping table mapping a port number of the broadcasting / multicasting packet to a priority order to be assigned to the port number,
Wherein the priority control unit assigns a priority to the access point using the mapping table. (a) receiving a packet from the outside;
(b) analyzing the received packet to determine the type of packet;
(c) differentially adjusting QoS according to a port number of a broadcasting / multicasting packet when the type of the received packet is a broadcasting / multicasting packet; And
(d) transmitting the received packet to a user terminal in a broadcasting / multicasting manner according to the differentiated QoS,
The step (c)
(c-1) separating the broadcasting / multicasting packet according to a port number;
(c-2) assigning priority to the separated broadcasting / multicasting packet according to the port number; And
(c-3) inputting the broadcasting / multicasting packet having the priority assigned to each queue corresponding to the priority order
And controlling the QoS for the broadcast service in the wireless LAN. The method according to claim 6,
The step (b)
And analyzing the packet type using an IP address or a port number of the received packet. delete The method according to claim 6,
The step (c-2)
Wherein a priority is assigned to a port number of the broadcasting / multicasting packet by using a mapping table that maps a port number of the broadcasting / multicasting packet and a priority to be assigned to the port number. A computer-readable recording medium storing a program for executing the steps according to any one of claims 6, 7, and 9.

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