KR20090085407A - Apparatus and method for configuraing end to end compression channel in broadband wireless communication system - Google Patents

Abstract

An apparatus for constructing an end-to-end compression channel in a wideband wireless communication system and a method thereof are provided to omit the recovery and recompression processing which is performed by a control station. A communication unit(302) provides a control message to a message analysis unit(304), and then provides a data packet to a data buffer(308). The message analysis unit analyzes messages received from lower level nodes. A message generator(306) produces messages transmitted to the lower level nodes.

Description

APPARATUS AND METHOD FOR CONFIGURAING END TO END COMPRESSION CHANNEL IN BROADBAND WIRELESS COMMUNICATION SYSTEM}

The present invention relates to packet compression in broadband wireless communication systems, and more particularly, to an apparatus and method for configuring an end to end compression channel in a broadband wireless communication system.

The 4th Generation (hereinafter referred to as '4G') communication system provides users with services of various quality of service (QoS) using a transmission rate of about 100 Mbps. There is active research going on. Particularly, in 4G communication systems, studies are being actively conducted to support high-speed services in a form of guaranteeing mobility and QoS in a broadband wireless access (BWA) communication system such as a wireless local area network system and a wireless urban area network system. Is going on. In addition, the representative communication system is the Institute of Electrical and Electronics Engineers (IEEE) 802.16 system.

For efficient use of radio resources in the 802.16 wireless communication system, ROHC (Robust Header Compression) technique, which is one of techniques for compressing a header of a packet, is used. The ROHC technique is a technique for reducing the packet capacity by changing an IP (Internet Protocol) header, a User Datagram Protocol (UDP) header, and a Realtime Transport Protocol (RTP) header to an ROHC header. According to the ROHC scheme, first, uncompressed header information is exchanged between two objects using the ROHC scheme, and then packets compressed according to the ROHC scheme are exchanged. Therefore, an object performing compression and decompression according to the ROHC scheme must store and maintain IP header information and ROHC context information for compressing and decompressing a packet.

In general, in a wireless communication system, the compression and decompression function according to the ROHC scheme is implemented in an access service network (ASN) and a terminal. Accordingly, the ROHC channel is created between the terminal and the access service network. Therefore, when both terminals communicating with each other compress the packet according to the ROHC scheme, the compressed packet transmitted from the originating terminal is restored in the access service network according to the ROHC channel configuration parameter between the originating terminal and the access service network. The recovered packet is compressed again according to the ROHC channel setting parameter between the access service network and the target terminal and then delivered to the target terminal.

As described above, since a compression channel is created between the terminal and the access service network, when performing communication between two terminals using the ROHC scheme, restoration and recompression are performed in the access service network. That is, although both terminals have a compression and decompression function according to the ROHC scheme, direct exchange of compressed packets between the two terminals is not performed. As a result, processor resources for compression and restoration and memory resources for storing ROHC contexts are generated in accordance with the ROHC scheme in the access service network.

Accordingly, an object of the present invention is to provide an apparatus and method for reducing the demand for processor resources and memory resources in an access service network (ASN) for the restoration and compression of header compressed packets in a broadband wireless communication system. .

Another object of the present invention is to provide an apparatus and method for configuring an end-to-end header compression channel in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for performing a header compression proxy function in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for delivering a header compressed packet exchanged between two terminals using an end-to-end header compression channel to a target terminal in a broadband wireless communication system.

According to a first aspect of the present invention for achieving the above object, a control station apparatus in a broadband wireless communication system, the control unit for checking whether a call connection request between the two terminals using the same compression scheme occurs, and And a proxy configured to configure an end-to-end compression channel for two terminals.

According to a second aspect of the present invention for achieving the above object, a method of operating a control station in a broadband wireless communication system, if a call connection request between the two terminals, the process of identifying the available compression scheme of the two terminals; And, if the two terminals use the same compression scheme, characterized in that it comprises the step of configuring the end-to-end compression channel for the two terminals.

In a broadband wireless communication system, an end-to-end single compression channel is configured due to a proxy operation for header compression of a control station's packet, thereby eliminating the restoration and recompression process performed by the control station. Thus, the demand for processor resources and consumed memory resources of the control station is reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, a description will be given of a technique for configuring an end to end ROHC (RObust Header Compression) compression channel in a broadband wireless communication system. Hereinafter, the present invention will be described using an Orthogonal Frequency Division Multiplexing (OFDM) / Orthogonal Frequency Division Multiple Access (OFDMA) scheme as an example. The same applies to other wireless communication systems. In addition, the present invention is described below by taking a wireless communication system having a two-tier structure as an example, and may be equally applicable to other wireless communication systems.

1 schematically illustrates the delivery of compressed packets end-to-end in a broadband wireless communication system according to the present invention.

As shown in FIG. 1, the wireless communication system considered in the present invention includes terminals 110 and 150, base stations 120 and 140, and a control station 130. Here, the base stations (120, 140) and the control station 130 constitutes an access service network (ASN).

The terminals 110 and 150 are portable devices of the user and are end devices for the user's network access and service use. In addition, the terminals 110 and 150 have a compression and decompression function according to the ROHC technique.

The base stations 120 and 140 communicate with the terminals 110 and 150 through a wireless channel and manage radio resources for accessing a network of the terminal. The base stations 120 and 140 may be represented by a radio access station (RAS).

The control station 130 is a device that performs a gateway function of a subnet including a plurality of base stations, and may be represented as an access control router (ACR) or an access service network_gateway (ASN_GW). In addition, the control station 130 manages a service flow (SF), a connection, and mobility of the terminal 110. The control station 130 transmits a packet exchanged between the terminals 110 and 150 to a base station connected to the target terminal through a generic routing encapsulation (GRE) tunnel. The GRE tunnel is created between the control station 130 and the base stations 120 and 140 and identified using a GRE key. And, the control station 130 has a compression and decompression function according to the ROHC technique.

When the compressed packet is transmitted from the terminal A 110 to the terminal B 120 according to the ROHC scheme, the operation of each object illustrated in FIG. 1 is as follows. In the following description, it is assumed that the packet is a Voice over Internet Protocol (VoIP) packet.

First, the terminal A 110 generates a packet to be transmitted. In this case, the packet includes an Internet Protocol (IP) header, a User Datagram Protocol (UDP) header, a Realtime Transport Protocol (RTP) header, and a payload. The terminal A 110 compresses the packet according to the ROHC scheme, and then transmits the compressed packet to the base station A 120 through a wireless channel. In this case, the compressed packet is composed of a ROHC header and a payload.

The base station A 120 receiving the compressed packet inserts a GRE header and a transport IP header into the compressed packet. The base station A 120 transmits the packet consisting of the GRE header, the transport IP header, the ROHC header, and the payload to the control station 130. Here, the GRE header includes a GRE key of a GRE tunnel between the base station A 120 and the control station 130.

Accordingly, the control station 130 operates as an ROHC proxy, so that the control station 130 changes the GRE key in the GRE header included in the received packet to the GRE key of the GRE tunnel with the base station B 140. do. And, according to the changed GRE key, the control station 130 transmits the received packet to the base station B (140).

After receiving the packet consisting of the transport IP header, the GRE header, the ROHC header, and the payload, the base station B 140 removes the transport IP header and the GRE header, and then stores the compressed packet composed of the ROHC header and the payload. 150).

Upon receiving the compressed packet, the terminal B 150 restores the packet including the IP header, the UDP header, the RTP header, and the payload by performing the restoration according to the ROHC scheme.

The terminal A 110 and the terminal B 150 perform a procedure for a call connection before exchanging packets. During the procedure for the call connection, the control station 130 performs the terminal. A preparation procedure for operating as an ROHC proxy for the A 110 and the terminal B 150 is performed. A preparation procedure for the ROHC proxy operation will be described below with an example of message exchange for call connection.

2 shows an example of message exchange for call connection in a broadband wireless communication system according to the present invention.

Referring to FIG. 2, the terminal A 110 transmits a service flow generation request message to the base station A 120 (step 201). The service flow generation request message is a message for requesting generation of a service flow of a MAC layer for call connection, and includes an IP address of a destination terminal and ROHC capability information of the terminal A 110. Here, the ROHC capability information is meant to include information such as a ROHC profile, the maximum number of Channel IDenfiers (ROHC), and whether a large ROHC CID is used. The service flow generation request message may be referred to as a 'DSA-REQ (Dynamic Service Addition-REQuest) message'. That is, the terminal A 110 transmits the service flow generation request message for generating a service flow of the MAC layer according to a call connection instruction generated in an application layer by a user's manipulation.

The base station A 120 receiving the service flow creation request message transmits a first path registration request message for generating a service flow between the terminal A 110 and the control station 130 to the control station 130. (Step 203). The first path registration request message includes an IP address of the target terminal and information on supportable ROCH of the terminal A 110. The first path registration request message may be referred to as a 'Path Reg (Regstration) Request message'.

After receiving the first path registration request message, the control station 130 confirms that the IP address of the target terminal included in the first path registration request message is the IP address of the terminal B 150 belonging to the first terminal. The second path registration request message for generating the service flow with the terminal B 150 is transmitted to the base station B 140 (step 205). At this time, the control station 130 includes the ROHC capability information of the terminal A (110) in the second path registration request message. Here, whether the terminal B 150 supports the ROHC scheme is known when the terminal B 150 enters a network.

Upon receiving the second path registration request message, the base station B 140 transmits a service flow generation request message to the terminal B 150 (step 207). The service flow generation request message is a message for requesting generation of a service flow of a MAC layer for call connection, and includes ROHC capability information of the terminal A 110. Here, the ROHC channel parameter information is meant to include information such as the ROHC profile, the maximum number of ROHC CIDs, whether to use a large ROHC CID. The service flow generation request message may be referred to as a DSA-REQ message.

Upon receiving the service flow request message, the terminal B 150 transmits a service flow generation response message to the base station B 140 in response to the service flow request message (step 209). In this case, the terminal B 150 compares the ROHC capability information included in the service flow request message with its ROHC capability information and then determines ROHC channel configuration parameters. In addition, the terminal B 150 includes the ROHC channel configuration parameter information in the service flow generation response message. Here, the service flow generation response message may be referred to as a 'DSA-RSP (ReSPonse) message'.

Upon receiving the service flow generation response message, the base station B 140 transmits a second path registration response message to the control station 130 (step 211). In this case, the second path registration response message includes the ROHC channel configuration parameter information determined by the terminal B 150. The second path registration response message may be referred to as a 'Path Reg Response message'.

Upon receiving the second path registration response message, the control station 130 transmits a second path registration confirmation message to the base station B 140 (step 213). The second path registration confirmation message is a message indicating an acknowledgment of the second path registration response message and may be referred to as a 'Path Reg Ack (Acknowledge) message'.

Upon receiving the second path registration confirmation message, the base station B 140 transmits a service flow generation confirmation message to the terminal B 150 (step 215). The service flow generation confirmation message is a message indicating completion of service flow generation of the MAC layer according to the exchange of the service flow generation request message and the service flow generation response message, and may be referred to as a 'DAS-ACK message'.

Subsequently, the control station 130 transmits a first path registration response message to the base station A 120 (step 217). In this case, the first path registration response message includes the ROHC channel configuration parameter information determined by the terminal B 150. Here, the first path registration response message may be referred to as a 'Path Reg Response message'.

Upon receiving the first path registration response message, the base station A 120 transmits a service flow generation response message to the terminal A 110 (step 219). In this case, the service flow generation response message is a response to the service flow generation request message delivered in step 201 and includes ROHC channel setting parameter information received through the first path registration response message. Here, the service flow response message may be referred to as a 'DSA-RSP message'.

Upon receiving the service flow generation response message, the terminal A 110 checks the ROHC channel parameter information included in the service flow generation response message and then transmits a service flow generation confirmation message to the base station A 120 (221). step). The service flow generation confirmation message is a message indicating completion of service flow generation of the MAC layer according to the exchange of the service flow generation request message and the service flow generation response message, and may be referred to as a 'DAS-ACK message'.

Upon receiving the service flow creation confirmation message, the base station A 120 transmits a first path registration confirmation message to the control station 130 (step 223). The first path registration confirmation message is a message indicating an acknowledgment of the first path registration response message and may be referred to as a 'Path Reg Ack message'.

Thereafter, the terminal A 110 and the terminal B 120 configure an ROHC channel according to the exchanged ROHC channel setting parameters, and the base station A 120, the control station 130, and the base station B 140. In step 225, packets are compressed according to the ROHC scheme. At this time, the control station 130 transfers the compressed packet without performing restoration and recompression.

As described above, the control station according to the present invention configures an end-to-end ROHC channel for two terminals using the ROHC scheme. However, the function of configuring the end-to-end compression channel described above can be equally applied to the case of using other header compression schemes as well as the ROHC scheme. Moreover, the function of configuring the end-to-end compression channel described above is equally applicable to a compression scheme performed on a header of a packet as well as a compression scheme performed on a portion other than the header (for example, a payload). Can be.

Hereinafter, the configuration and operation of the control station for configuring the end-to-end compression channel as described above will be described in detail with reference to the drawings.

3 is a block diagram of a control station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the control station uses a communication unit 302, a message interpretation unit 304, a message generation unit 306, a data buffer 308, a control unit 310, and a compression proxy unit 312. It is configured to include.

The communication unit 302 provides an interface for communicating with lower nodes in the access service network. That is, the communication unit 302 converts an electrical signal according to the received standard into a bit string, and converts and transmits the transmitted bit string into an electrical signal according to the standard. In addition, the communication unit 302 classifies a control message and a data packet, provides a received control message to the message interpreter 304, and provides the received data packet to the data buffer 308.

The message interpreter 304 interprets the messages received from the lower nodes, and provides the controller 310 with information obtained through the interpreted message. For example, when a call connection request is made from a terminal, the message interpreter 304 checks the compression capability information of the terminal requesting the connection by interpreting a message received from the base station. Here, the compression capability information has a different form according to the compression technique. For example, in the case of the ROHC scheme, the compression capability information includes information such as an ROHC profile, a maximum number of ROHC CIDs, and whether a large ROHC CID is used. In addition, the message interpreter 304 interprets a message including compressed channel configuration parameter information determined by the terminal requesting the connection.

The message generator 306 generates a message transmitted to the lower nodes. Here, the message includes information to be transmitted to the lower nodes provided from the controller 310. For example, when a call connection request is made from a terminal, the message generator 306 generates a message including compression capability information of the terminal requesting the connection. The message generator 306 generates a message including compressed channel configuration parameter information determined by the terminal that has received a connection request.

The data buffer 308 temporarily stores data packets exchanged with the lower nodes. That is, the data buffer 308 provides the data packet provided from the communication unit 302 to the control unit 310, and provides the data packet provided from the control unit 310 to the communication unit 302.

The control unit 310 controls the overall operation of the control station. For example, the controller 310 processes information included in a control message received from lower nodes. In addition, the controller 310 generates information to be transmitted to the lower nodes, and provides the generated information to the message generator 304. For example, the controller 310 generates a GRE tunnel for packet transmission between the control station and the terminal. The GRE tunnel is a logical link used for packet transmission between the control station and the terminal. The controller 310 checks the destination terminal of the data packet received from the lower node and processes the data packet to be delivered to the identified destination terminal. That is, when the target terminal is a terminal dependent on the control station itself, the controller 310 transmits the data packet through the GRE tunnel corresponding to the target terminal. Alternatively, when the target terminal is not a terminal dependent on the control station itself, the controller 310 transmits the data packet to the control station managing the target terminal. In particular, according to the present invention, when a call connection request between two terminals that are dependent on the control station itself and use the same compression scheme occurs, the controller 310 configures a single compression channel between the two terminals. The compression proxy unit 312 is controlled. In addition, when a compressed packet is received from a terminal using an end-to-end compression channel configured by the compression proxy unit 312, the controller 310 provides the compressed packet to the compression proxy unit 312.

The compression proxy unit 312 performs a function for configuring a compression channel between two terminals using the same compression scheme. That is, the compression proxy unit 312 controls the compression capability information of the terminal requesting connection to be delivered to the terminal requesting the connection, and the compression channel configuration parameter information determined by the terminal requesting the connection is the terminal requesting the compression. To be passed to the control. In addition, when a compressed packet received from the terminal using the end-to-end compression channel from the controller 310 is provided, the compression proxy unit 312 uses the GRE key of the compressed packet to use the end-to-end compression channel. After changing to the GRE key corresponding to the GRE tunnel of the other terminal, the GRE key changed compressed packet is provided to the controller 310.

An end-to-end compressed channel configuration and a compressed packet processing procedure of the control station are described below based on the configuration of the control station shown in FIG.

First, the controller 310 depends on the control station itself, and checks whether a call connection request between two terminals using the same compression scheme occurs. Here, the compression scheme of each of the two terminals is checked when the two terminals enter the network. For example, the compression technique may be a ROHC technique.

When the call connection request occurs, the controller 310 provides the compression capability information of the terminal requesting the connection to the compression proxy unit 312, and the compression proxy unit 312 provides the compression capability of the terminal requesting the connection. The message generator 306 is controlled to generate a message including the information. Accordingly, the message generator 306 generates a message including the compression capability information of the terminal requesting the connection, and the communication unit 302 transmits the message to the terminal requesting the connection. In this case, the message is transmitted through a base station connected with a terminal that has requested the connection. And, the compression capability information of the terminal requesting the connection is obtained when the call connection request.

When the compressed channel setting parameter information determined by the terminal requesting the connection is received, the control unit 312 provides the compressed channel setting parameter information to the compression proxy unit 312, and the compressed proxy unit ( 312 controls the message generator 306 to generate a message including the compressed channel configuration parameter information determined by the terminal that is requested to connect. Accordingly, the message generator 306 generates a message including the compressed channel setting parameter information, and the communication unit 302 transmits the message to the terminal requesting the connection. Here, the message is transmitted through the base station connected with the terminal requesting the connection.

After configuring the end-to-end compression channel as described above, when a compressed packet exchanged between the two terminals is received, the controller 310 provides the packet to the compression proxy unit 312. At this time, compressed packets exchanged between two terminals using the end-to-end compression channel are identified as follows. The control unit 310 checks the ROHC session of the compressed packet through an uplink TCID (Uplink Transport ID IDifier) in a GRE header included in the compressed packet, and checks the service flow corresponding to the ROHC session. The target terminal of the received packet can be known. Accordingly, the controller 310 checks whether the compressed packet exchanged between the two terminals is received by checking the destination terminal of the compressed packet and the originating terminal of the uplink TCID.

The compression proxy unit 312 receiving the compressed packet exchanged between two terminals using the end-to-end compression channel changes the GRE key included in the GRE header into a GRE key corresponding to the target terminal of the compressed packet. After that, it is provided to the controller 310. Here, the GRE key is information for identifying a GRE tunnel, and the GRE tunnel is a logical link used for packet transmission between the control station and the terminal. Accordingly, the control unit 310 transmits the compressed packet according to the changed GRE key. In other words, the controller 310 controls the communication unit 302 to transmit the compressed packet to the destination terminal through a GRE tunnel corresponding to the changed GRE key.

4 illustrates a compressed channel configuration and a compressed packet processing procedure of a control station in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 4, in step 401, the control station checks whether a call connection request between two terminals using the same compression scheme subordinate to itself occurs. The compression scheme of each of the two terminals is confirmed when the two terminals enter the network. For example, the compression technique may be a ROHC technique.

When the call connection request occurs, the control station proceeds to step 403 and transmits the compression capability information of the terminal that requested the connection to the terminal that has received the connection. Here, the compression capability information of the terminal requesting the connection is transmitted through the base station connected to the terminal requesting the connection. That is, the control station transmits a message including the compression capability information of the terminal requesting the connection to the base station connected with the terminal requesting the connection. In addition, the compression capability information of the terminal requesting the connection is obtained when the call connection request.

Thereafter, the control station proceeds to step 405 and delivers the compressed channel configuration parameter information determined by the terminal that is requested to connect to the terminal that requested the connection. In this case, the compressed channel configuration parameter information of the terminal requesting the connection is transmitted through a base station connected to the terminal requesting the connection. That is, the control station transmits a message including compressed channel configuration parameter information of the terminal that has received the connection to the base station connected to the terminal that has requested the connection. The compressed channel configuration parameter information of the terminal that has received the connection request is obtained through a response message to the message transmitted in step 403.

In step 407, the control station determines whether a compressed packet exchanged between the two terminals is received. Here, the compressed packet is received through the base station and includes a GRE header. That is, the control station can identify the target terminal of the compressed packet by confirming the ROHC session of the compressed packet through the uplink TCID included in the GRE header and confirming the service flow corresponding to the ROHC session. . Accordingly, the control station confirms whether or not to receive the compressed packet exchanged between the two terminals by checking the destination terminal of the compressed packet and the originating terminal of the uplink TCID.

When the compressed packet is received, the control station proceeds to step 409 and changes the GRE key included in the GRE header to a GRE key corresponding to the target terminal of the compressed packet. Here, the GRE key is information for identifying a GRE tunnel, and the GRE tunnel is a logical link used for packet transmission between the control station and the terminal.

After changing the GRE key, the control station proceeds to step 411 and transmits the compressed packet according to the changed GRE key. In other words, the control station transmits the compressed packet to the destination terminal through a GRE tunnel corresponding to the changed GRE key.

The control station then proceeds to step 413 to determine if the call is terminated. If the call is not terminated, the control station returns to step 407. On the other hand, when the call ends, the control station ends this procedure.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram schematically illustrating the transmission of end-to-end compressed packets in a broadband wireless communication system according to the present invention;

2 is a diagram illustrating an example of message exchange for call connection in a broadband wireless communication system according to the present invention;

3 is a block diagram of a control station in a broadband wireless communication system according to an embodiment of the present invention;

4 is a diagram illustrating a compressed channel configuration and a compressed packet processing procedure of a control station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Claims (16)

A control station apparatus in a broadband wireless communication system, A controller for checking whether a call connection request between two terminals using the same compression scheme occurs; And a proxy unit configured to configure an end-to-end compression channel for the two terminals. The method of claim 1, And the two terminals are terminals dependent on the same control station. The method of claim 1, The proxy unit controls to transmit the compression capability information of the terminal requesting the connection to the terminal requesting the connection, and to control the compression channel configuration parameter information determined by the terminal requesting the connection to be delivered to the terminal requesting the compression. Characterized in that the device. The method of claim 1, When the compressed packet exchanged between two terminals using the end-to-end compression channel is received, the controller provides the compressed packet to the proxy unit, The proxy unit, characterized in that for changing the Generic Routing Encapsulation (GRE) key corresponding to the originating terminal included in the compressed packet to a GRE key corresponding to the target terminal of the compressed packet. The method of claim 4, wherein The control unit may identify a compression session of the compressed packet through an uplink TCID (Transport Connection IDentifer) in a GRE header included in the received compressed packet, and a service flow corresponding to the compression session. Check the destination terminal of the compressed packet. The method of claim 4, wherein The controller is characterized in that for transmitting the compressed packet to the destination terminal through a GRE tunnel (tunnel) corresponding to the changed GRE key. The method of claim 1, And the compression technique is a header compression technique. The method of claim 7, wherein The two terminals, characterized in that the terminal using the ROHC (RObust Header Compression) technique. A method of operating a control station in a broadband wireless communication system, When a call connection request is generated between two terminals, checking a usable compression scheme of the two terminals; If the two terminals use the same compression scheme, comprising configuring an end-to-end compression channel for the two terminals. The method of claim 9, The two terminals are characterized in that the terminal is dependent on the same control station. The method of claim 9, The process of configuring the end-to-end compression channel, Delivering the compression capability information of the terminal requesting the connection to the terminal requesting the connection; And transmitting the compressed channel configuration parameter information determined by the terminal that has received the connection to the terminal that has requested the compression. The method of claim 9, Checking whether a compressed packet exchanged between two terminals using the end-to-end compression channel is received; And changing a Generic Routing Encapsulation (GRE) key corresponding to the originating terminal included in the compressed packet into a GRE key corresponding to the destination terminal of the compressed packet. The method of claim 12, The process of checking whether a compressed packet exchanged between two terminals using the end-to-end compression channel is received, Confirming a compressed session of the compressed packet through an uplink transport connection identifier (TCID) in a GRE header included in the received compressed packet; Identifying a target terminal of the compressed packet by identifying a service flow corresponding to the compressed session. The method of claim 12, And transmitting the compressed packet to the destination terminal through a GRE tunnel corresponding to the changed GRE key. The method of claim 9, And the compression technique is a header compression technique. The method of claim 15, The two terminals are terminals using a ROHC (RObust Header Compression) technique.

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