KR100610221B1 - Data divergence apparatus and method thereof in wibro - Google Patents

Abstract

Disclosed are a data branching apparatus of a portable internet and a method for providing a traffic branch between a wired and wireless interface between a base station and a control station of the portable internet. To this end, the data branch device of the portable Internet for data packet transmission between the control station and the base station receives the data packet from the base station and classifies the packet to be transmitted through the wired link and / or the wireless link according to a predetermined classification standard. A transmitter for transmitting the data packet to a control station based on an inter-link service rule and a packet service rule according to states of the wired link and the wireless link; And forming a packet stream of data packets transmitted from the control station through the wired link and / or the wireless link, classifying the data packets according to a predetermined classification criterion, and then transmitting the data packets to the base station according to a predetermined packet service rule. By including a receiver for transmitting the packet, it supports QoS of packet traffic and increases the utilization of wired or wireless backhaul to minimize the circuit cost.

Mobile Internet, Branch Device, Base Station, Control Station, Packet, Scheduler

Description

Data Divergence Apparatus and Method in WiBro}

1 is a block diagram showing a general portable Internet network.

2 is a block diagram showing a data branching apparatus of the portable Internet according to an embodiment of the present invention.

3 is a flowchart illustrating a data branching method of a portable Internet according to an embodiment of the present invention.

4 is a flowchart illustrating a data branching method of a portable Internet according to another embodiment of the present invention.

* Explanation of Codes on Major Parts of Drawings *

200: transmitter

210: packet classifier 220: wired link queue

230: wireless link queue 240: wired link scheduler

250: wireless link scheduler 260: wired link output scheduler

270: radio link output scheduler 280: link state detector

300: receiver

310: packet mux 320: packet classifier

330: link queue 340: scheduler

The present invention relates to a portable Internet, and more particularly, to a data branching apparatus and a method of the portable Internet for providing a traffic branch between a wired and wireless interface between a base station and a control station of the portable Internet.

The portable Internet is a high-speed data-oriented service. For the efficiency of the service, it is necessary to give priority to the data according to the characteristics of the data and manage QoS according to the priorities. However, this management method has been mainly limited to the radio section between the terminal and the base station. This is explained in more detail.

1 is a block diagram showing a general portable Internet network.

As shown in FIG. 1, the portable Internet network includes a plurality of terminals (Potable Subscriber Station, PSS) 110; At least one base station (RAS) 120 wirelessly connected to the terminal 110; And at least one control station (Access Control Router, ACR) 130 connected to the base station 120 in a wired or wireless manner.

The terminal 110 provides an IP-based wireless service function through a wireless connection with the base station 120, and can be connected to another network as the IP can be moved.

In addition, the base station 120 is responsible for radio resource management and control functions to provide an IP-based wireless service function to the terminal 110 in the portable Internet network, and supports the mobility of the IP through the handoff, Quality of Service (QoS) must be guaranteed.

On the other hand, the control station 130 manages the IP mobility through the IP routing function, and also controls the mobility between the base station 120 in the control station 130.

In such a portable Internet network, a terminal (PSS) 100 and a base station (RAS) 120 are referred to as a U-interface, and a base station (RAS) 120 and a control station (ACR) 130 are connected to the A-interface. The control station (ACR) 130 and the control station (ACR) 130 is called an IR-interface, and the control station (ACR) 130 and the core network element (eg, AAA, HA) are I. It's called an interface.

At this time, the U-interface follows the portable Internet standard access standards, the I-interface follows the standard protocol standards such as IETF, while the standardization of the A-interface and IR-interface is currently under discussion.

In particular, as the transmission speed of the U-interface increases significantly, the need for QoS management for the A-interface increases. That is, in the existing mobile communication network, a wired backhaul such as E1 / T1 is used between the base station 120 and the control station 130. However, in the portable Internet network, the transmission speed of the U-interface is greatly increased up to 30Mbps per FA. Therefore, a large capacity wired backhaul is required. As a result, the line rental cost of wired backhaul increases significantly, which deteriorates the economics of portable Internet services.

On the other hand, as the interest in the problem of reducing the line rental cost for wired backhaul is increasing, wireless backhaul technology for solving this wirelessly is developing. For example, a radio transmission technology using IEEE802.16 is a representative example. Therefore, the wireless backhaul system has been increasingly utilized due to its relatively large transmission speed and economy, and ease of installation and expansion.

However, the wireless backhaul system described above has a large effect of reducing the line lease cost, but the bit error performance is inferior to that of the wired backhaul system.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data branching apparatus of the portable Internet and a method for classifying according to the type of packets transmitted from the portable Internet base station to the control station and branching to a suitable wired / wireless interface.

Another object of the present invention is to provide a data branching device of the mobile Internet and a method for transmitting data requiring high reliability through a wired backhaul of high cost / low transmission rate, and transmitting the remaining data using a wideband wireless backhaul have.

In order to achieve the above object, the data branch of the portable Internet for data packet transmission from the base station to the control station according to an embodiment of the present invention, to send packets input from the base station to the wired link according to a predetermined classification criteria. A packet classifier for determining whether a packet is a packet to be transmitted over a radio link; A wire link queue for storing packets to be sent to the wire link according to the determination; A radio link queue that stores packets to be sent to the radio link according to the determination; At least one link scheduler for determining a packet to be transmitted to the radio link or the wire link according to whether a packet exists in the wire link queue and / or radio link queue and a predetermined packet service rule; And after determining whether the wired link and the wireless link operate normally, after determining whether to transmit the packet from the wired link queue or the packet from the wireless link queue based on the determination result, transmit the packet to the link scheduler. And an output scheduler for indicating.

In addition, the data branch device of the portable Internet for data packet transmission from the control station to the base station according to another embodiment of the present invention, the packet inputted through the wired link and / or wireless link of the control station in a single packet stream Packet mux; A packet classifier for classifying packets transmitted from the packet mux according to predetermined classification criteria; A link queue that stores packets classified through the packet classifier; And a scheduler for determining which packet to transmit to the base station according to the presence or absence of packets stored in the link queue and a predetermined packet service rule.

In addition, the data branch device of the portable Internet for data packet transmission between the control station and the base station according to another embodiment of the present invention, receives the data packet from the base station and transmits a packet to be transmitted over a wired link and / or a wireless link A transmitting unit which transmits the data packet to a control station based on an interlink service rule and a packet service rule according to the states of the wired link and the wireless link after classifying according to a predetermined classification criterion; And forming a packet stream of data packets transmitted from the control station through the wired link and / or the wireless link, classifying the data packets according to a predetermined classification criterion, and then transmitting the data packets to the base station according to a predetermined packet service rule. It characterized in that it comprises a receiving unit for transmitting the packet.

Meanwhile, in the data branching method of the portable Internet for data packet transmission from a base station to a control station according to an embodiment of the present invention, (a) when the data packet is received from the base station, the packet classifier determines the data packet. Determining whether to transmit a wired link or a wireless link based on the classification criteria and transmitting the same to a link queue; (b) storing the packets in different sub-queues, wherein the link queues are classified by the packet classifier and belong to the same kind or belong to the same attribute; (c) determining whether the states of the wired link and the wireless link operate normally and transmitting the result of the status to the output scheduler; And (d) determining, by the output scheduler, whether to transmit the data packet to the wired link and / or the wireless link, reading the corresponding packet of the subqueue, and transmitting the packet to the corresponding link. It features.

In addition, the data branching method of the portable Internet for data packet transmission from the control station to the base station according to another embodiment of the present invention, (a) the packet mux data packets that are input via the wired link and wireless link as a packet stream Mixing and transmitting the packet classifier; (b) the packet classifier receiving the packet stream and classifying the packet stream according to a predetermined classification criterion, and storing the packets of the same type or belonging to the same attribute in different sub-queues; And (c) the scheduler determining which packet to transmit to the base station based on the presence or absence of the packets stored in the sub-queue and a packet service rule, and then transmitting the corresponding packets to the base station.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. Like reference numerals refer to like or similar elements throughout the drawings.

2 is a block diagram showing a data branching apparatus in a portable Internet network according to an embodiment of the present invention.

As shown in FIG. 2, the branch device includes: a transmitter 200 for transmitting a data packet from a base station 120 to a wired or wireless link; And a receiver 300 for transmitting the data packet transmitted from the wired or wireless link to the base station 120.

The transmitter 200, the packet classifier 210; At least one wired link queue 220; At least one radio link queue 230; Wired link scheduler 240; Radio link scheduler 250; Wired link output scheduler 260; Radio link output scheduler 270; And a link state detector 280.

The packet classifier 210 determines whether a packet to be transmitted from the base station 120 to the wired link or a packet to be transmitted to the wireless link according to a predetermined classification criteria and transmits the packet to the corresponding link queue.

In this case, the predetermined classification criteria may include a classification based on a bandwidth of a corresponding link, a classification based on a service level, a classification based on real time / non-real time, an application type, a current time zone, and the like.

For example, in case of classification according to service class, a packet for a high quality service user is transmitted to the wire link queue 220, and a packet for a general service user is transmitted to the radio link queue 230, thereby causing a bit error for high quality service. To take advantage of less wired networks.

Here, the traffic type may be determined based on field information of the input packet. The field information of the packet includes a source IP address, a destination IP address, a destination port number, a corresponding protocol (eg, TCP, UDP), a type of service, ToS); And Differentiated Service Code Point (DSCP).

Meanwhile, the wired link queue 220 and the radio link queue 230 each include at least one or more subqueues 225, and different packets belonging to the same type (attribute) classified through the packet classifier 210 are different from each other. Save to a sub queue.

The wire link scheduler 240 and the radio link scheduler 250 determine which packets to transmit to the external link (eg, the radio link or the wire link) according to the existence of the packets stored in the sub queue and the packet service rule. .

The packet service rule is a rule for which sub-queue to send the packet to the wired link or the wireless link, and is considered according to the properties of the packets.

For example, when the wire link has a bandwidth of 1 Mbps, and wants to guarantee the flow of a specific packet having a bandwidth of 100 Kbps, the wire link scheduler 240 periodically selects a sub-queue in which the specific packet is stored once every 10 times. It can be transmitted by wire link. Such packet service rules may be determined by an administrator in advance, but vary according to traffic.

The link state detector 280 determines whether the wired link and the wireless link operate normally, and then transmits the determination result to the wired link output scheduler 260 and the wireless link output scheduler 270, respectively.

Whether the wire link output scheduler 260 and the radio link output scheduler 270 service packets from the wire link queue 220 based on the state of the wire link or the radio link detected by the link state detector 280, respectively. Determine whether to service packets from link queue 230.

That is, when both the wired link and the wireless link detected by the link state detector 280 are normal, the wired link output scheduler 260 services the packet only through the wired link scheduler 240, and the wireless link output scheduler ( 270 services the packet only through the radio link scheduler 250.

However, when at least one link operates abnormally, packets stored in the wired link queue 220 and the radio link queue 230 are properly serviced according to the inter-link service rule.

Here, the inter-link service rule means a rule for setting a traffic ratio in advance so that a packet can be transmitted through another normal link when a wired link or a wireless link is abnormal.

For example, if the radio link is abnormal, the packet traffic set to be transmitted over the wired link should not exceed 80% of the wired link bandwidth while the remaining 20% of the packet traffic is set to be transmitted over the wireless link. The inter-link service rule may be determined by the network manager in advance, and varies depending on the traffic volume.

On the other hand, the receiving unit 300, packet mux (MUX) (310); A packet classifier 320; Link queue 330; And a scheduler 340.

The packet mux 310 transmits the packets input through the wired link and the wireless link into a single traffic stream and transmits them to the packet classifier 320.

The packet classifier 320 performs a function of transferring a packet transmitted from the packet mux 310 to a corresponding sub queue of the link queue 330 according to a predetermined classification criterion. In this case, the predetermined classification criteria may include a classification based on a bandwidth of a corresponding link, a classification based on a service level, a classification based on real time / non-real time, an application type, a current time zone, and the like.

In addition, the traffic type may be determined based on field information of an input packet. The field information of the packet includes a source IP address, a destination IP address, a destination port number, a corresponding protocol (eg, TCP, UDP), a type of service, ToS); And Differentiated Service Code Point.

The link queue 330 is composed of at least one subqueue, and stores packets belonging to the same type (attribute) classified through the packet classifier 320 in different subqueues.

The scheduler 340 determines which packet is to be transmitted to the base station 120 according to the existence of packets stored in the sub queue of the link queue 330 and the packet service rule. In this case, the packet service rule may be determined by an administrator in advance, and may vary according to the traffic amount.

A data branching method in a portable Internet network according to an embodiment of the present invention configured as described above will be described with reference to the accompanying drawings.

1) Transmit from base station (RAS) to control station (ACR)

When the base station 120 receives a data packet from the base station 120 to be transmitted to the control station 130, the packet classifier 210 transmits the data packet to the wired link or the wireless link based on a predetermined classification criterion. Determine (S301).

In this case, the classification criteria may include a classification based on a bandwidth of a corresponding link, a classification based on a service level, a classification based on real time / non-real time, an application type, a current time zone, and the like.

For example, in case of classification according to service class, a packet for a high quality service user is transmitted to the wire link queue 220, and a packet for a general service user is transmitted to the radio link queue 230, thereby causing a bit error for high quality service. To take advantage of less wired networks.

Also, the type of traffic is determined based on field information of an input packet. The field information of the packet includes a source IP address, a destination IP address, a destination port number, a corresponding protocol (eg, TCP, UDP), a type of service, ToS); And Differentiated Service Code Point (DSCP).

Thereafter, the wired link queue 220 or the radio link queue 230 stores packets belonging to the same type or the same attribute classified by the packet classifier 210 in different sub-queues (S302).

Meanwhile, the link state detector 280 determines whether the states of the wired link and the wireless link operate normally, and transmits the states to the wired link output scheduler 260 and the wireless link output scheduler 270 (S303).

As a result of the determination, if all operate normally, the wired link output scheduler 260 instructs the wired link scheduler 240 to receive a data packet only through the wired link queue 220, and the wireless link output scheduler 270 The radio link scheduler 250 instructs to receive the data packet only through the radio link queue 230 (S304-S305).

However, as a result of the determination, if the wired link operates abnormally, the radio link output scheduler 270 is stored in the wired link queue 220 and the radio link queue 230 through the wireless link based on the inter-link service rule. The radio link scheduler 250 is controlled to transmit a data packet (S306-S307).

On the contrary, if the radio link operates abnormally, the wire link output scheduler 260 transmits data packets stored in the wire link queue 220 and the radio link queue 230 through the wire link based on the inter-link service rule. The wire link scheduler 240 is controlled to be performed (S308).

2) Transmission from control station (ACR) to base station (RAS)

When the control station 130 receives the data packet to be transmitted to the base station 120 through the wired link and the wireless link at the receiving unit, the packet mux 310 receives the data packet inputted through the wired link and the wireless link in a traffic stream ( The stream is mixed to the packet classifier 320 and then transmitted (S401).

Subsequently, the packet classifier 320 receives the mixed data packet and classifies the mixed data packet according to a predetermined classification criterion, and stores packets of the same type or belonging to the same attribute in different sub-queues 335 of the link queue 330, respectively. (S402).

Subsequently, the scheduler 340 determines which packet is to be transmitted to the base station 120 based on the presence or absence of packets stored in the sub queue 335 of the link queue 330 and the packet service rule, and then transmits the corresponding packets to the base station (see FIG. 120) (S403).

While the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will recognize that various modifications or changes can be made without departing from the spirit and scope of the invention.

As described above, according to the present invention, by classifying according to the type of packet transmitted from the mobile Internet base station to the control station and branching to a suitable wired / wireless interface, there is an effect of supporting QoS of packet traffic.

In addition, according to the present invention, by transmitting data requiring high reliability through a high cost / low data rate wired backhaul, the rest of the data by utilizing a broadband wireless backhaul, thereby increasing the utilization of the wired or wireless backhaul to increase the line cost It is effective to minimize

Claims (21)

In the data branch of the portable Internet for transmitting data packets from the base station to the control station, A packet classifier for determining whether to send packets input from the base station to a wired link or a packet to be transmitted through a wireless link according to a predetermined classification criterion; A wire link queue for storing packets to be sent to the wire link according to the determination; A radio link queue that stores packets to be sent to the radio link according to the determination; At least one link scheduler for determining a packet to be transmitted to the radio link or the wire link according to whether a packet exists in the wire link queue and / or radio link queue and a predetermined packet service rule; And After determining whether the wired link and the wireless link operate normally, after determining whether to transmit a packet from the wired link queue or a packet from the wireless link queue based on the determination result, instructing the link scheduler to transmit a packet. And a data scheduler for outputting the portable internet. The method of claim 1, wherein the output scheduler, A link state detector for determining whether the wired link and the wireless link operate normally; A wire link output scheduler instructing the link scheduler to determine whether to transmit a packet from a wire link queue or a packet from a radio link queue based on the state of the wire link detected by the link state detector; And And a radio link output scheduler which instructs the link scheduler to transmit a packet after determining whether to transmit a packet from a wired link queue or a packet from a radio link queue based on the state of the radio link detected by the link state detector. A data branching device of a portable internet, characterized in that. The method of claim 1 or 2, wherein the classification criteria And at least one of a classification according to a link bandwidth, a classification according to a service level, a classification according to real time / non-real time, an application type, and a current time zone. The method according to claim 1 or 2, wherein the wired link queue and the radio link queue are And at least one subqueue, each of which stores packets belonging to the same type and / or attribute classified through the packet classifier in different subqueues. The method of claim 1 or 2, wherein the packet service rule is The data branching device of the portable Internet, which is determined according to the attributes of the packets, determines whether to transmit a packet stored in the wired link queue and / or the radio link queue to the wired link or the wireless link according to a predetermined rule. . The system of claim 1 or 2, wherein the output scheduler is When both the wired link and the wireless link state is normal, the wired link output scheduler services the packet only through the wired link scheduler, and the wireless link output scheduler services the packet only through the wireless link scheduler. Data branching device. The system of claim 1 or 2, wherein the output scheduler is When one of the wired link and the wireless link is abnormal, the data of the portable Internet, such that packets stored in the wired link queue and the wireless link queue are transmitted through another normal link according to the inter-link service rule. Branching device. The method of claim 7, wherein the inter-link service rule is And a rule for setting a threshold traffic ratio at which a packet can be transmitted through another normal link when the wired or wireless link is abnormal. In the data splitter of the portable Internet for data packet transmission from the control station to the base station, A packet mux which makes packets inputted through the wired and / or wireless link of the control station into one packet stream; A packet classifier for classifying packets transmitted from the packet mux according to predetermined classification criteria; A link queue that stores packets classified through the packet classifier; And And a scheduler for determining which packet to transmit to the base station according to the presence or absence of packets stored in the link queue and a predetermined packet service rule. The method of claim 9, wherein the classification criteria And at least one of a classification according to a link bandwidth, a classification according to a service level, a classification according to real time / non-real time, an application type, and a current time zone. The method of claim 9 or 10, wherein the link queue is And at least one sub-queue, and storing packets belonging to the same type and / or attribute classified through the packet classifier in different sub-queues. 11. The method of claim 9 or 10, wherein the packet service rule And a rule which determines whether to transmit a packet stored in the link queue to the base station according to a predetermined rule. In the data branch of the portable Internet for data packet transmission between the control station and the base station, After receiving the data packet from the base station and classifying the packet to be transmitted through a wired link and / or a wireless link according to a predetermined classification criteria, based on the inter-link service rule and packet service rule according to the state of the wired link and wireless link A transmitter for transmitting a data packet to a control station; And Data packets transmitted from the control station via the wired link and / or wireless link are made into one packet stream, the data packets are classified according to a predetermined classification criterion, and then the packets are transmitted to the base station according to a predetermined packet service rule. And a data receiver for transmitting data. The method of claim 13, wherein the transmitting unit A first packet classifier for determining whether packets to be sent from the base station are to be sent over a wired link or a packet over a wireless link according to a predetermined classification criterion; A wire link queue for storing packets to be sent to the wire link according to the determination; A radio link queue that stores packets to be sent to the radio link according to the determination; At least one link scheduler for determining a packet to be transmitted to the radio link or the wire link according to whether a packet exists in the wire link queue and the radio link queue and a predetermined packet service rule; And An output scheduler for instructing packet transmission to the link scheduler after determining whether the wired link and the wireless link operate normally, and then determining whether to transmit a packet from a wired link queue or a packet from a wireless link queue based on the determination result. Data branching device of the portable Internet, comprising a. The method of claim 14, wherein the output scheduler, A link state detector for determining whether the wired link and the wireless link operate normally; A wire link output scheduler instructing the link scheduler to determine whether to transmit a packet from a wire link queue or a packet from a radio link queue based on the state of the wire link detected by the link state detector; And And a radio link output scheduler which instructs the link scheduler to transmit a packet after determining whether to transmit a packet from a wired link queue or a packet from a radio link queue based on the state of the radio link detected by the link state detector. A data branching device of a portable internet, characterized in that. The method according to claim 13 or 14, wherein the receiving unit A packet mux which makes packets inputted through the wired and / or wireless link of the control station into one packet stream; A second packet classifier for classifying packets transmitted from the packet mux according to a predetermined classification criterion; A link queue that stores packets classified through the second packet classifier; And And a scheduler for determining which packet to transmit to the base station according to the presence or absence of packets stored in the link queue and a predetermined packet service rule. In the data branching method of the portable Internet for data packet transmission from the base station to the control station, (a) when a data packet is received from the base station, a packet classifier determining whether to transmit the data packet on a wired link or a wireless link based on a predetermined classification criterion and transmitting the data packet to a link queue; (b) storing the packets in different sub-queues, wherein the link queues are classified by the packet classifier and belong to the same kind or belong to the same attribute; (c) determining whether the states of the wired link and the wireless link operate normally and transmitting the result of the status to the output scheduler; And (d) determining, by the output scheduler, whether to transmit the data packet to the wired link and / or the wireless link, reading the corresponding packet of the subqueue, and transmitting the data packet to the corresponding link. The data branching method of the portable Internet. 18. The method of claim 17, wherein step (d) As a result of the determination, if all operate normally, the data scheduler transmits the data packet stored in the wired link queue to the wired link, and transmits the data packet stored in the radio link queue to the wireless link. Way. 18. The method of claim 17, wherein step (d) As a result of the determination, when the wired link is abnormally operated, the output scheduler transmits data packets stored in the wired link queue and the wireless link queue through the wireless link based on the inter-link service rule. Data branching method. 18. The method of claim 17, wherein step (d) As a result of the determination, when the radio link operates abnormally, the link output scheduler causes the data packet stored in the wire link queue and the radio link queue to be transmitted through the wire link based on the inter-link service rule. Data branching method. In the data branching method of the portable Internet for data packet transmission from the control station to the base station, (a) a packet mux, mixing data packets inputted through a wired link and a wireless link into a packet stream and transmitting them to a packet classifier; (b) the packet classifier receiving the packet stream and classifying the packet stream according to a predetermined classification criterion, and storing the packets of the same type or belonging to the same attribute in different sub-queues; And (c) a scheduler determines which packet is to be transmitted to the base station based on the presence or absence of packets stored in the sub-queue and a packet service rule, and then transmitting the corresponding packets to the base station. Branching method.

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