KR20190047420A - Method and apparatus for providing throughput guidance based on udp encapsulation - Google Patents

Abstract

The present invention relates to a method for providing, to a content server, a response packet including bandwidth information calculated based on radio channel information and a cell load in a base station. More specifically, in order to solve a problem that the bandwidth information included in the response packet transmitted from a terminal to the content server is deleted in a transmission process and is not transmitted to the content server, the response packet including the bandwidth information is UDP-encapsulated and transmitted to the content server so that the bandwidth information inserted into a packet is provided to the content server without being deleted by a bug of the gateway or a firewall setting.

Description

[0001] METHOD AND APPARATUS FOR PROVIDING THROUGHPUT GUIDANCE BASED ON UDP ENCAPSULATION [0002]

The present invention relates to a method of providing a response packet including bandwidth information calculated based on wireless channel information and a cell load in a base station to a content server, and more particularly, to a method in which bandwidth information is deleted and transmitted to a content server A method of providing bandwidth information that can encapsulate a UDP response packet including bandwidth information and transmit the response packet to a content server when a certain information is deleted in a process of transmitting a pilot packet to a content server in order to solve a problem that can not be solved, .

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

In order to efficiently transmit content from a content server to a mobile terminal in a mobile communication system, it is necessary to utilize the available bandwidth as much as possible. In order to more efficiently utilize the bandwidth, the content server may employ a method of inferring a network environment by detecting RTT (Round Trip Time) measurement and packet loss on the transmission layer side, it is possible to use a method of inferring information using information received through a report. That is, the content server can adapt to the network environment by adjusting the TCP window size and the send rate or changing the resolution and encoding rate of the media based on the inferred network environment.

However, in the conventional method, since the content server is inferred based on information received without prior information, it is not easy to adapt to the instantly changed radio channel environment or cell load change, And thus waste of resources is generated. In addition, the content server may transmit data packets in excess of the available bandwidth due to erroneous reasoning, thereby causing a problem of packet loss and performance degradation.

In order to solve the problem, a base station estimates an available bandwidth based on information on a wireless channel environment and cell load monitoring, calculates a throughput guidance (TG), and transmits the calculated bandwidth information to a content server To the optional field of the uplink TCP packet header to be transmitted.

However, in the TG transmission method, when the content server is located in the public Internet, the packet passes through many routers or gateways until reaching the destination. At this time, the option field of the TCP packet header is transmitted to the router Or a gateway may exist. For security reasons, there may be a router or a gateway for arbitrarily deleting the option field of the TCP header by the firewall setting and then forwarding it.

That is, when a packet including bandwidth information is transmitted to a content server through a router or a gateway existing in a public Internet network, the TG transmission method avoids a router or gateway in which a bug or a firewall security setting exists, There is a problem that the bandwidth information can not be delivered to the content server because there is no control.

Korean Unexamined Patent Application Publication No. 10-2004-0105032, Jun. 16, 2006 discloses a method of providing a bandwidth broker and a differentiated service for accessing a router belonging to a network path between a server and a client,

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method and apparatus for a mobile communication system in which a base station calculates bandwidth information (TG) and adds the calculated bandwidth information to an option field of an uplink TCP packet header A method of providing bandwidth information that can be transmitted, and an apparatus therefor.

In particular, according to the present invention, in a process of transmitting a packet including bandwidth information to a content server, a base station encapsulates UDP in order to prevent an option field of a TCP packet header from being deleted by a bug of a router or a gateway, A router or a gateway in the transmission path checks an external UDP header to allow an internal TCP packet header option field to be transmitted to the content server without being deleted, and an apparatus therefor. There is a purpose.

In addition, the content server of the present invention can confirm the bandwidth information suitable for the cell-load and the wireless channel environment in which the option field of the TCP packet header is not deleted and is constantly changed. Therefore, a bandwidth information providing method And an apparatus therefor.

However, the object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

According to an aspect of the present invention, there is provided an apparatus for providing bandwidth information, the apparatus comprising: a terminal for receiving a first type of response packet transmitted from the terminal to the content server in response to a content packet received from the content server; An encapsulation necessity determination module for transmitting a pilot packet for determining whether the response packet of the first format is encapsulated in a second format to the content server, determining an encapsulation necessity by checking a response message according to the encapsulation necessity determination module; And an encapsulation module for encapsulating the response packet of the first format into a second format according to the determination result.

In this case, the first format may be a TCP (Transmission Control Protocol) format and the second format may be a UDP (User Datagram Protocol) format.

The bandwidth information providing apparatus includes: a bandwidth information calculating module for calculating bandwidth information available to the terminal; And a bandwidth information inserting module for inserting the bandwidth information into the response packet of the first format.

In addition, the encapsulation necessity determination module may transmit a pilot packet, in which reference data shared with the content server is inserted, to the content server in the option field of the first type of packet header, and receive the response message from the content server can do.

The encapsulation necessity determination module receives a response message including a normal reception response from the content server when the reference data of the pilot packet is not deleted, and when the reference data is deleted, Lt; RTI ID = 0.0 > a < / RTI > response packet.

In addition, the encapsulation necessity determination module determines that encapsulation is not required in the second format when receiving the response message including the normal reception response, and when the response message including the port information is received, It may determine that encapsulation is necessary and provide the port information to the encapsulation module.

Also, the encapsulation module generates a second type header by setting the port information as a destination port, and attaches the generated second type header as an external header of the first type response packet, May be encapsulated in the second format.

According to another aspect of the present invention, there is provided a bandwidth information providing method for providing bandwidth information to a content server, the method comprising the steps of: Receiving a response packet of a first type to be transmitted; Transmitting, to the content server, a pilot packet for determining whether the response packet of the first format is encapsulated in a second format; And checking a response message of the content server with respect to the pilot packet to determine whether encapsulation is necessary.

In addition, the pilot packet is a packet in which reference data shared with the content server is inserted in an option field of a packet header, and the step of determining whether or not the encapsulation is necessary includes the steps of: Receiving a response message including a normal reception response from the content server and receiving a response message including port information for receiving the second type of response packet from the content server when the reference data is deleted; And determining that encapsulation is not required in the second format when receiving the response message including the normal reception response and determining that encapsulation is necessary in the second format when receiving the response message including the port information . ≪ / RTI >

And if it is determined that the encapsulation is necessary in the second format, a header of the second format is set by setting the received port information as a destination port, and the generated header is attached to the outer header of the first type response packet, And encapsulating the first type of response packet in the second format.

Further, the present invention can provide a computer-readable recording medium on which a program for executing the above-described method is recorded.

According to the method and apparatus for providing bandwidth information based on the UDP encapsulation of the present invention, the base station estimates the available bandwidth of the terminal based on the information on the wireless channel environment and the cell load, Information is added to the option field of the uplink packet header transmitted to the content server by the terminal, so that the content server can more quickly confirm the bandwidth information suitable for the wireless channel environment and the cell load to be changed instantaneously, Resources can be used more efficiently.

According to the present invention, a UDP encapsulation is performed on an uplink TCP packet transmitted from a terminal to a content server, so that a content server is located in a public Internet network or the like, and a bug of a router or a gateway, The bandwidth information can be provided to the content server without being deleted so that the quality of service can be improved by maximizing the bandwidth available to the content server and minimizing the packet loss.

In addition, various effects other than the above-described effects can be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 is an exemplary diagram illustrating a network system to which a bandwidth information providing method according to an embodiment of the present invention is applied.
2 to 3 are data flow charts for explaining a bandwidth information providing method according to an embodiment of the present invention.
4 is a block diagram illustrating a main configuration of a base station according to an embodiment of the present invention.
5 is a flowchart illustrating an operation in a base station according to an embodiment of the present invention.
6 is a diagram for explaining a response packet according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention. This is to omit the unnecessary description so as to convey the key of the present invention more clearly without fading. While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, it should be understood that the invention is not limited to the specific embodiments thereof, It is to be understood that the invention is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In addition, when referring to an element as being "connected" or "connected" to another element, it means that it can be connected or connected logically or physically. In other words, it is to be understood that although an element may be directly connected or connected to another element, there may be other elements in between, or indirectly connected or connected.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprising " or " having ", as used herein, are intended to specify the presence of stated features, integers, It should be understood that the foregoing does not preclude the presence or addition of other features, numbers, steps, operations, elements, parts, or combinations thereof.

Now, a method and apparatus for providing bandwidth information according to an embodiment of the present invention will be described in detail with reference to the drawings. Here, the same reference numerals are used for similar functions and functions throughout the drawings, and a duplicate description thereof will be omitted. Furthermore, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted, or may be shown in block diagram form centering on the core functions of each structure and device.

Hereinafter, a network system to which a bandwidth information providing method according to an embodiment of the present invention is applied will be described first.

1 is an exemplary diagram illustrating a network system to which a bandwidth information providing method according to an embodiment of the present invention is applied.

Referring to FIG. 1, the terminal 100 of the present invention may include a browser for transmitting / receiving information, a memory for storing programs and protocols, a microprocessor for executing and controlling various programs, and the like. 200 and may be connected to the access network 410 and may be connected to the core network 420 via the access network 410. [

In addition, the terminal 100 of the present invention is connected to the access network 410 and the core network 420 through the base station 200, and then establishes a TCP session with the content server 300 via the Internet network 430 . The terminal 100 may request content from the content server 300 through the access network 410, the core network 420 and the Internet network 430 and may receive the content transmitted from the content server 300, have. At this time, the terminal 100 can receive content from the content server 300 on a packet-by-packet basis, generate a response packet for each content packet, and transmit the response packet to the content server 300.

The terminal 100 of the present invention can be replaced with terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), and Subscriber Station (SS) In addition, it can be implemented in the form of a mobile terminal such as a smart phone, a tablet PC, and a PDA (Personal Digital Assistants) that can be carried by a user of the terminal 100 of the present invention. Or may be implemented in the form of a navigation device that can be used as a navigation device.

A base station (BS) 200 is a terminal node of a network that directly communicates with a terminal 100, and is connected to a terminal 100 existing within a communicable distance through a wireless channel, Refers to a fixed station that supports wireless communication of the base station 100 and is connected to the access network 410. The base station 200 of the present invention may be implemented as a BTS (Base Station Transmission System) in a synchronous (CDMA) network and may include a base station controller (BSC) that controls a base station. Also, in the asynchronous (WCDMA) network, the BTS may be replaced with a NodeB, and the BSC may be replaced with an RNC (Radio Network Controller). In addition, it can be implemented as an eNodeB that is an evolved base station type in an LTE (Long Term Evolution) network.

In addition, the base station 200 according to an exemplary embodiment of the present invention includes one or more cells. The base station 200 may transmit a radio channel of the terminal 100 according to a control protocol such as a Radio Resource Control Protocol And control transmission and reception of a radio frame through the set radio channel.

At this time, the communication from the base station 200 to the terminal 100 is called downlink communication, and the communication from the terminal 100 to the base station 200 is called uplink communication. In addition, in the downlink, the transmitter may be part of the base station 200, and the receiver may be part of the terminal 100. In the uplink, the transmitter may be part of the terminal 100, and the receiver may be part of the base station 200. In addition, the multiple access schemes for downlink and uplink transmission may be the same or different from each other. For example, the downlink may use OFDMA (Orthogonal Frequency Division Multiple Access), and the uplink may use SC-FDMA (Single Carrier-Frequency Division Multiple Access).

In addition, the wireless channel environment of the base station 200 to which the terminal 100 accesses can be continuously changed due to various factors such as the number of connected terminals 100 and the like. Also, the terminal 100 can continuously move, and when moving at a high speed, the handoff to the connected cell can be performed rapidly.

Thus, the surrounding environment of the terminal 100 can be continuously changed. Therefore, the base station 200 to which the terminal 100 is currently connected must be able to quickly measure the bandwidth information of the peripheral network environment of the terminal 100 and transmit the measured bandwidth information to the content server 300. The base station 200 of the present invention inserts the bandwidth information into the header of the response packet and transmits the response packet to the content server 300 when the response packet for the content packet transmitted from the terminal 100 to the content server 300 is confirmed .

In this case, the base station 300 according to the embodiment of the present invention may transmit the response packet inserted with the bandwidth information directly to the content server 300, but the bandwidth information is not deleted through the router or the gateway in the transmission process Encapsulation can also be done in other formats.

More specifically, the operation in the base station 200 will be described later.

Meanwhile, the core network 420 of the present invention performs circuit switching or packet switching, and performs core functions for mobile communication services such as mobility control and switching, Lt; RTI ID = 0.0 > and / or < / RTI > The core network 420 manages inter-frequency mobility and may serve for interworking with traffic in the base station 200 and the core network 420 and with other networks, for example, the Internet network 430. The core network 420 may include a Mobile Switching Center (MSC), a Home Location Register (HLR), a Mobile Mobility Entity (MME), and a Home Subscriber Server (HSS).

In this network system, the terminal 100 can be connected to the access network 410 and the core network 420 through the base station 200. Upon completion of the initial access procedure, A bearer is set up and an EPC bearer can be set in the base station 200 and the core network 420. [ The base station 200 of the present invention can set and manage such bearer information, and can insert the bandwidth information into a response packet transmitted to the content server 300 according to the set bearer, and transmit the bandwidth information to the content server 300.

The content server 300 can establish a TCP session with the terminal 100 and receive the content request from the terminal 100 in which the TCP session is established and transmit the content to the terminal 100 on a packet- . In addition, the content server 300 of the present invention can receive a response packet including bandwidth information, check the bandwidth information of the received response packet, and adjust the TCP window size and the send rate Or adaptively change the resolution and encoding rate of the media to support the adaptive communication service according to the bandwidth information.

A method for providing bandwidth information according to an embodiment of the present invention will be described later. A processor installed in the terminal 100, the base station 200, and the content server 300 according to the embodiment of the present invention, And process program instructions for executing the method. In one implementation, the processor may be a single-threaded processor, and in other embodiments, the processor may be a multithreaded processor. Further, the processor is capable of processing instructions stored on a memory or storage device.

Hereinafter, a method of providing bandwidth information according to an embodiment of the present invention will be described in more detail.

2 to 3 are data flow charts for explaining a bandwidth information providing method according to an embodiment of the present invention.

6, a response packet for a content packet transmitted from the terminal 100 to the content server 300 via the base station 200 is transmitted in a first format, that is, a TCP (Transmission Control Protocol ) Format. Specifically, it is composed of an IP header, a TCP header, and a payload.

The base station 200 inserts the calculated bandwidth information TG after receiving the response packet as shown in (a) from the terminal 100 to form a response packet as shown in (b). In the option field of the TCP header, Information is inserted. In the following description, this is referred to as a first response packet.

Meanwhile, in the process of transmitting the first response packet to the content server 300 through the Internet 430 as described above, the TCP header option field is deleted due to a bug of a router or a gateway or a firewall security setting, A problem may occur that it is not transmitted to the server 300.

In order to solve the above problem, the base station 200 encapsulates the first response packet in a second format, that is, encapsulates UDP (User Datagram Protocol) according to a response message to a pilot packet transmitted from the base station 200 to the content server 300 do. The response packet in which UDP encapsulation is performed is shown in (c). In the following description, this is referred to as a second response packet. A UDP header is generated by setting UDP port information included in a response message received from the content server 300 as a destination port, attaches the generated UDP header as an outer UDP header of the first response packet, The second response packet can be normally routed in the core network 420 by copying the IP header of the received response packet and attaching the IP header of the response packet to the external IP header to delete the bandwidth information from the content server 300 through the Internet network 430 So that it can be delivered normally.

That is, when encapsulating in UDP as shown in (c), the router or gateway existing in the intermediate path only checks the external IP header and the external UDP header, so that the TCP header option field of the internal IP packet is not deleted and transmitted to the content server 300 .

The content server 300 removes the external IP header and the external UDP header of the received second response packet and extracts the bandwidth information value of the TCP header option field of the internal IP packet to optimize the TCP window size in the transport layer, And can be used for transmission content optimization.

FIG. 2 and FIG. 3 are data flow charts for explaining a method of providing bandwidth information when encapsulation is necessary and when UDP encapsulation is not required, respectively.

2 and 3, the terminal 100 and the base station 200 according to the embodiment of the present invention can perform an initial connection process, and then the terminal 100 can access the Internet through the Internet network 430 The user can establish a connection to the content server 300 and establish a TCP session between the terminal 100 and the content server 300.

Communication between the terminal 100, the base station 200, and the content server 300 in which a TCP session is established can be performed according to a protocol stack composed of a plurality of layers. For example, the communication protocol stack of the AT 100 may include an application layer, a TCP / IP layer, a packet data control protocol (PDCP) layer, a radio link control (RLC) layer, A Medium Access Control (MAC) layer, and a Physical layer (L1 layer). The communication protocol stack of the base station 200 may include a PDCP layer, an RLC layer, a MAC layer, and a physical layer. The communication protocol stack of the content server 300 may include an application layer, a TCP / IP layer, and an L2 / L1 layer.

According to the protocol stack, the terminal 100 can request content from the content server 300. For example, when the terminal 100 transmits a user's content request generated through the application layer to the physical layer via each layer of the protocol stack, the physical layer transmits data to be transmitted to the wireless layer using the allocated time- To the base station 200. The base station 200 delivers the content request to the content server 300 and the content server 300 receives the content request transmitted by the terminal 100 through the L2 / L1 layer, the TCP / IP layer, and the application layer .

Thereafter, the content server 300 transmits the content to the terminal 100 in response to the request of the terminal 100. At this time, the content can be transmitted according to the communication protocol stack as described above. At this time, the content transmitted to the terminal 100 by the content server 300 can be sequentially transmitted on a packet-by-packet basis, May be transmitted to the terminal (100) via the Internet (200).

At this time, when the terminal 100 normally receives the content packet, it constructs a response packet informing that the reception is normally completed and transmits it to the content server 300 through the base station 200 (S 207 to S 213)

When receiving a response packet for the content from the AT 100, the BS 200 of the present invention for monitoring the above process calculates the throughput guidance (TG) to be inserted into the response packet (S 209) The calculated bandwidth information is added to the response packet to form a first response packet (S 211). In step S 209, the base station 200 of the present invention can calculate the bandwidth information at the time when the response packet is received, and set the other time point so that the wireless channel environment and the cell load, etc., It can be continuously monitored to estimate the available bandwidth and to calculate bandwidth information.

As described above, since the bandwidth information added to the TCP header option field of the first response packet may be deleted in the process of being transmitted to the content server 300 through the router or the gateway, S 205 is performed.

That is, it is first determined whether UDP encapsulation is required for the first response packet in order to prevent deletion of the bandwidth information inserted in the TCP header option field.

The base station 200 transmits a pilot packet, in which the reference data shared with the content server 300 is inserted, to the content server 300 in the TCP header option field with the content server 300, (S 201).

The content server 300 checks the data in the TCP header option field of the received pilot packet. If the reference data is not deleted (S 203), the content server 300 transmits a response message (ACK) including a normal reception response to the TCP payload to the base station 200) (S 205).

When receiving the ACK, the base station 200 determines that the UDP encapsulation is not necessary for the response packet received from the terminal, and performs the above steps S 209 to S 213.

In addition, the base station 200 of the present invention may insert bandwidth information into a content response packet header transmitted from the terminal 100 to the content server 300, but is not limited to a content response packet. That is, the base station 200 according to the embodiment of the present invention inserts the bandwidth information into the uplink packet transmitted from the terminal 100 to the content server 300, and transmits the inserted uplink packet. Various acknowledgment packets (ACK) as well as various uplink packets may be applied.

Hereinafter, a method of providing bandwidth information when UDP encapsulation is required will be described with reference to FIG.

The base station 200 transmits a pilot packet to the content server 300 (S 301), and the content server 300 checks the data in the TCP header option field of the received pilot packet, (S303). The reference data inserted in the TCP header option field may be deleted by a bug in the transmission process or by the firewall security setting.

If the reference data is deleted, the content server 300 opens a UDP port for receiving a response packet encapsulated in a format other than the IP / TCP packet, that is, UDP (S 305) (NACK and UDP port information) including the UDP port information to the base station 200 (S307).

When the terminal 100 normally receives the content packet from the terminal 100, the base station 200 receives a response packet indicating that the reception of the content packet is normally completed (S309), and transmits the bandwidth information TG (S 311), and adds the calculated bandwidth information to the response packet to form a first response packet (S 313).

Upon receipt of the response message including the UDP port information, the base station 200 recognizes that the bandwidth information is deleted from the router or gateway existing in the path through which the packet is transmitted to the content server 300, UDP encapsulation is performed on the inserted first response packet (S 315). The base station 200 performs UDP encapsulation by attaching the UDP header generated by setting the UDP port information included in the second response message as a destination port, and transmits the second response packet, which has been UDP encapsulated, to the content server 300 (S 317). The bandwidth information inserted in the TCP header option field of the internal IP packet by the UDP encapsulation can be transmitted to the content server 300 without being deleted in the transmission process.

4 is a block diagram illustrating a main configuration of a base station according to an embodiment of the present invention.

Referring to FIG. 4, the base station 200 according to the embodiment of the present invention may include a communication interface device 210 and a bandwidth information providing device 220.

For convenience of explanation, it is assumed that the bandwidth information providing apparatus 220 exists in one module form in the base station 200. [ However, the present invention is not limited to the apparatus configuration. In other words, the base station 200 of the present invention performs only its own communication function in the wireless communication system. The bandwidth information providing apparatus 220 of the present invention is adjacent to the base station 200 and can communicate with the base station 200 separately Server < / RTI > Hereinafter, it is assumed that the bandwidth information providing apparatus 220 is included in the base station 200 for convenience of explanation.

First, the communication interface unit 210 of the present invention controls the connection process with the terminal 100, allocates radio resources to the terminal 100, controls the process of connecting to the core network 420 of the terminal 100 . In addition, the communication interface device 200 of the present invention monitors information transmitted / received between the terminal 100 and the content server 300.

The bandwidth information providing apparatus 220 according to an embodiment of the present invention calculates the bandwidth information defined in the present invention and transmits the bandwidth information to the content server 300. The bandwidth information providing apparatus 220 includes a TG calculation module 221, A UDP encapsulation necessity determination module 222, a UDP encapsulation necessity determination module 223, and a UDP encapsulation module 224.

More specifically, the TG calculation module 221 of the present invention calculates bandwidth information corresponding to the terminal 100. The TG calculation module 221 of the present invention can continuously monitor the wireless channel environment and cell load connected to the terminal 100 to estimate available bandwidth and calculate the bandwidth information accordingly. At this time, the TG calculation module 221 can calculate information for bandwidth estimation corresponding to each layer constituting the communication protocol stack, and calculates the bandwidth available for the terminal 100 using the calculated bandwidth estimation information Information can be calculated.

The TG insertion module 222 includes the bandwidth information calculated through the TG calculation module 221 in a response packet for an uplink packet, for example, a content packet, which is transmitted from the terminal 100 to the content server 300 Can play a role. In particular, the TG insertion module 222 inserts the bandwidth information into a TCP header option field of a response packet corresponding to a specific content packet transmitted to the content server 300, The response packet can be transmitted to the content server 300.

In addition, the TG insertion module 222 according to an embodiment of the present invention confirms service information corresponding to the terminal 100 or determines whether or not to insert the bandwidth information according to the QoS information of the bearer set corresponding to the terminal 100 And may insert the bandwidth information into the response packet only when it is determined to insert the bandwidth information.

Meanwhile, if the UDP encapsulation is required according to the determination result of the UDP encapsulation necessity determination module 223, the TG insertion module 222 according to another embodiment of the present invention directly transmits the first response packet in which the bandwidth information is inserted, The UDP encapsulation module 224 transmits the first response packet to the UDP encapsulation module 224 so that UDP encapsulation can be performed.

That is, in the present invention, the UDP encapsulation necessity determination module 223 uses the protocol shared with the content server 300 to transmit a pilot packet in which the reference data shared with the content server 300 is inserted in the TCP header option field, (300), and waits for a response from the content server (300). The UDP encapsulation necessity determination module 223 determines whether UDP encapsulation is required according to the type of the response message received from the content server 300 according to whether or not the reference data is deleted in the pilot packet transmission process. When 'ACK' is received as a response message, since the reference data is not deleted in the process of transmitting to the content server 300, it is determined that the bandwidth information inserted at the same position as the reference data is not deleted and it is determined that UDP encapsulation is not necessary And the determination result is transmitted to the TG insertion module 222 to form a first response packet. When receiving the 'NACK' and UDP port information as the response message, it is determined that the reference data is deleted in the process of transmitting to the content server 300 and the bandwidth information inserted at the same position as the reference data is deleted, and UDP encapsulation is required The result of the determination is transmitted to the TG insertion module 222. The received UDP port information is transmitted to the UDP encapsulation module 224 and the first response packet formed in the TG insertion module 222 is transmitted to the content server 300 Encapsulation is performed in the UDP encapsulation module 224 before being transmitted to the UDP encapsulation module 224.

The UDP encapsulation module 224 generates a UDP header by setting the UDP port information received from the UDP encapsulation necessity determination module 223 as a destination port, attaches the header as an external header to the first response packet, which is an IP / TCP packet, It is possible to control the transmission of the second response packet, which is the UDP encapsulation, to the content server by copying the IP header of the response packet and attaching it to the external IP header.

5 is a flowchart illustrating an operation in a base station according to an embodiment of the present invention.

The base station 200 of the present invention can support the initial access procedure of the terminal 100 as described with reference to FIGS. 1 to 3. When the initial access procedure of the terminal 100 is completed, The base station 200 and the core network 420 may set up an EPC bearer between the BS 100 and the BS 200 and may configure an EPC bearer between the BS 200 and the BS 420 in operation S 501.

Hereinafter, the base station 200 of the present invention determines whether UDP encapsulation is necessary to prevent the bandwidth information inserted in the response packet for the content packet transmitted from the AT 100 to the content server 300 from being deleted in the transmission process And transmits a pilot packet to the content server 300 in order to determine (S503). The pilot packet is a packet in which the reference data shared with the content server 300 is inserted into the option field of the TCP header, and receives another response message depending on whether or not the reference data is deleted in the transmission process (S505 to S509). That is, when the reference data is deleted, the NACK and the port information for receiving the encapsulated packet are received in the response message (S507). If the reference data is not deleted, 'ACK' is received in the response message (S509).

When the base station 200 receives the response packet corresponding to the content packet transmitted from the terminal 100 in operation S 511, the base station 200 of the present invention calculates the bandwidth information in operation S 513, Information is inserted (S 515). It is determined whether UDP encapsulation is necessary before transmitting the response packet in which the bandwidth information is inserted to the content server 300 (S 517). This is determined by checking the response message received from the content server 300 according to the pilot packet transmission If it is determined that UDP encapsulation is not required according to the 'ACK', the base station 200 transmits the response packet including the bandwidth information to the content server 300 directly (S 521).

However, if the base station 200 determines that the UDP encapsulation is necessary as it receives the 'NACK', it performs UDP encapsulation on the response packet in which the bandwidth information is inserted (S 519) and transmits the UDP encapsulated response packet to the content server (S 521).

This process can be performed until the bearer set corresponding to the terminal 100 is released.

The method of providing bandwidth information according to the embodiment of the present invention has been described above.

In particular, the method for providing bandwidth information according to an embodiment of the present invention may be provided in the form of a computer readable medium suitable for storing computer program instructions and data.

Such a computer-readable recording medium may include program instructions, data files, data structures, etc., singly or in combination, and includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include an optical recording medium such as a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, a compact disk read only memory (CD-ROM), and a digital video disk (ROM), random access memory (RAM), flash memory, and the like, such as a magneto-optical medium such as a magneto-optical medium and a floppy disk, And hardware devices that are specifically configured to perform the functions described herein.

In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers of the technical field to which the present invention belongs.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be appreciated by those skilled in the art that numerous changes and modifications can be made to the invention.

Accordingly, it is intended that all such appropriate modifications and variations be considered within the scope of the present invention, and that the operations recited in the claims may still be carried out in a different order, while still achieving the desired results, It does not necessarily require the particular illustrated or sequential order to obtain the desired result.

The present invention relates to a method of providing bandwidth information calculated on the basis of radio channel information and cell load in a base station to a content server, and more particularly, And more particularly, to a bandwidth information providing method and apparatus for transmitting a UDP encapsulation response packet including bandwidth information to a content server when a certain information is deleted in a process of transmitting a pilot packet to a content server.

Industrial Applicability The present invention is industrially applicable because it is not only commercially available or operable but is practically and practically practicable.

100: terminal
200: base station
210: Communication interface device
220: a bandwidth information providing apparatus
221: TG calculation module
222: TG insertion module
223: UDP encapsulation necessity determination module
224: UDP encapsulation module
300: Content server

Claims (11)

A method for deciding whether to encapsulate a response packet of a first format in a second format with respect to a response packet of a first format transmitted from the terminal to the content server in response to a content packet received from a content server An encapsulation necessity determination module that transmits a pilot packet to the content server and determines a necessity of encapsulation by checking a response message according to the encapsulation necessity determination module; And
An encapsulation module for encapsulating the response packet of the first format into a second format according to the determination result;
The bandwidth information providing apparatus comprising: The method according to claim 1,
Wherein the first format is a TCP (Transmission Control Protocol) format, and the second format is a UDP (User Datagram Protocol) format. The apparatus of claim 1, wherein the bandwidth information providing apparatus comprises:
A bandwidth information calculation module for calculating bandwidth information available to the terminal; And
A bandwidth information insertion module for inserting the bandwidth information into the response packet of the first format;
The bandwidth information providing apparatus further comprising: The method according to claim 1,
The encapsulation necessity determination module
And transmits a pilot packet, in which reference data shared with the content server is inserted, to the content server in the option field of the packet header of the first format, and receives the response message from the content server accordingly. . 5. The method of claim 4,
The encapsulation necessity determination module
Receiving a response message including a normal reception response from the content server when the reference data of the pilot packet is not deleted; and transmitting, from the content server, port information for receiving the response packet of the second format And receiving the response message including the response information. 6. The method of claim 5,
The encapsulation necessity determination module
When receiving the response message including the normal reception response, determines that encapsulation is not required in the second format, and when receiving the response message including the port information, determines that encapsulation is necessary in the second format, And provides the information to the encapsulation module. 6. The method of claim 5,
The encapsulation module
Setting the port information as a destination port to generate a header of a second format and attaching the generated header of the second format to an outer header of the first type response packet to transmit the response packet of the first format to the second format And encapsulates the bandwidth information. A bandwidth information providing apparatus,
Receiving, from a terminal, a response packet of a first type transmitted from the terminal to the content server in response to a content packet received from the content server;
Transmitting, to the content server, a pilot packet for determining whether the response packet of the first format is encapsulated in a second format; And
Checking a response message of the content server with respect to the pilot packet to determine whether encapsulation is necessary;
And transmitting the bandwidth information. 9. The method of claim 8,
Wherein the pilot packet is a packet in which reference data shared with the content server is inserted in an option field of a packet header,
Wherein the determining whether the encapsulation is necessary includes:
Receiving a response message including a normal reception response from the content server when the reference data is not deleted in the pilot packet transmission process; and receiving, when the reference data is deleted, Receiving a response message including port information; And
Determining that encapsulation is not required in the second format when receiving the response message including the normal reception response and determining that encapsulation is necessary in the second format when receiving the response message including the port information;
And transmitting the bandwidth information. 10. The method of claim 9,
If it is determined that encapsulation is necessary in the second format,
Establishing a second type of header by setting the received port information as a destination port, attaching the generated header to an external header of the first type response packet, encapsulating the response packet of the first type in the second format ;
The method of claim 1, further comprising: A computer-readable recording medium storing a program for executing the method according to any one of claims 7 to 10.

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