KR20090058882A - Method for compressing packet and apparatus thereof - Google Patents

Abstract

A method for compressing packet and an apparatus thereof are provided to supply a guaranteed service by increasing the transmitting efficiency of packet data in a wireless communication network. A terminal or a base station classifies packet headers to be transmitted into a dynamic header and a static header according to the degree of change(S100). The terminal or the base station convert the classified dynamic and static headers into at least one octet including a first octet(S110). The terminal and the base station checks whether or not the field data of each header are changed(S120). If so, the terminal and the base station add the data for each field to the end of the first octet(S130).

Description

Packet compression method and apparatus thereof

The present invention relates to wireless communication technology, and more particularly, to a wireless transport layer protocol optimization technology.

This study is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research. [Task Management Number: 2005-S-404-33, 3G Evolution Terminal Technology Development]

The mobile communication system is a system for providing multimedia data including various high-definition images and high-quality music to a mobile terminal to receive various multimedia services.

In particular, the 3G Evolution (3GE) technology is a series of WCDMA (wideband code division multiple access), including CDMA2000 (code division multiple access 2000) and high speed downlink packet access (HSDPA). Rel.6 and later of 3G mobile communication system is a mobile communication technology that is evolved into IP network for efficient use of frequency efficiency and high speed multimedia service compared to existing system.

Here, 3GE is classified into mid-term evolution (MTE) and long-term evolution (LTE). MTE is currently working on the 3rd Generation Partnership Project (3GPP) and 3rd Generation Partnership Project 2 (3GPP2), the Multimedia Broadcast and Multicast Service (MBMS) and the High Speed Downlink. / Uplink Packet Access) schemes. In comparison, LTE includes high-speed wireless access technology, MBMC (Multi Band Multi Carrier) technology, and the like. In particular, 3G LTE technologies will provide a flexible mobile path to 4th generation mobile communication (4G).

However, in the wireless communication network, the packet transmission is so large that the header protocol of the packet is too difficult to be the optimal solution. That is, in a wireless environment, the bandwidth is limited, and there is a problem that it is difficult to transmit the packet efficiently because of the large header of the packet.

For example, if a protocol header includes Internet Protocol version 4 (IPv4) within a radio segment, much of the radio frequency bandwidth may be wasted in transmitting the header. Furthermore, when the protocol header includes Internet Protocol version 6 (IPv6), the header is further expanded in size, resulting in higher bandwidth loss than in IPv4.

 Therefore, there is a need for a compression technique or method that can efficiently transmit packet data in a limited wireless environment.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, and provides a packet compression method and apparatus for efficiently providing packet data in a wireless communication network to provide a service with guaranteed quality of service. It aims to provide.

In order to achieve the above object, the present invention proposes a packet compression method and apparatus capable of efficiently transmitting packet data in a wireless environment of a mobile communication network by converting a packet header into at least one octet.

More specifically, according to an aspect of the present invention, the above-described object is to classify a packet header to be transmitted into a dynamic header and a static header according to the degree of change, and whether the divided dynamic header and the static header are changed according to field data of each header. Is converted into at least one octet including the first octet indicated and matched at each position.

Meanwhile, according to another aspect of the present invention, the above object is to classify a packet header to be transmitted to a counterpart network device into a dynamic header and a static header according to the degree of change thereof, and to change the data of each header of the divided dynamic header and the static header for each field. Whether or not to match at each position is also achieved by the packet transmission method comprising the step of converting to at least one octet including the indicated first octet and transmitting the converted at least one octet to the counterpart network device. .

Meanwhile, according to another aspect of the present invention, the above-described object is a packet header converted from at least one octet from a counterpart network device to a field including whether the data of each field of the dynamic header and the static header has been changed. Receiving and analyzing the packet data using the packet data received and stored in advance if the field-specific data of the first octet is not changed, and using the field data added at the end of the first octet if the data is not changed. It is also achieved by the packet receiving method, characterized in that to recover the.

As described above, the present invention provides a packet compression method and apparatus for efficiently transmitting packet data in a wireless environment of a mobile communication network.

That is, in the wireless communication network, the packet header is compressed to increase the data transmission efficiency.

Furthermore, it is possible to effectively use the limited resources in the radio section, and there is an effect that can provide a high quality service to the user.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention; In the following description of the present invention, if it is determined that detailed descriptions of related well-known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

1 is a reference diagram for explaining a packet transmission process through packet compression according to a preferred embodiment of the present invention.

Referring to FIG. 1, packet compression according to the present invention is implemented through a packet data convergence protocol (PDCP) 10 in a wireless communication network. The wireless communication network may be a 3rd generation evolution (hereinafter referred to as 3GE) network.

The PDCP 10 may increase the efficiency of the radio channel by compressing the header of the packet data. In addition, the PDCP 10 may transmit user data of a packet data protocol using a service provided from a radio link control (hereinafter referred to as RLC) 30.

More specifically, the PDCP 10 includes a header compression protocol. For example, the header compression protocol may be ROHC (RObust Header Compression) or RFC 2507. ROHC, also referred to as RFC 3095, is an extended header compression protocol that actually compresses headers on a wireless link.

The Internet Protocol (IP) 20 is a protocol for transmitting a packet between different networks according to an IP address, that is, a protocol for controlling a path, thereby enabling data transmission between different networks.

The PDCP 10 may compress packet data received from an apparatus for transmitting and receiving a packet wirelessly, that is, a terminal or a base station. At this time, the PDCP 10 may receive the packet data from the higher layer protocol, compress the packet header of the received packet data, and then transmit the packet data to the lower layer protocol. For example, the packet header may be received from the IP 20 to compress the packet header, and the compressed packet header may be transmitted to the RLC 30.

In addition, the PDCP 10 may restore compressed packet data received from an apparatus for transmitting and receiving a packet wirelessly, that is, a terminal or a base station. Here, the PDCP 10 may receive the compressed packet data from the lower layer protocol, restore the packet header of the received compressed packet data, and then transmit the compressed packet data to the higher layer protocol. For example, compressed packet data may be received from the RLC 30 to restore the packet header, and the restored packet header may be transmitted to the IP 20. Here, the RLC 30 determines a communication type of whether to transmit the packet data transparently, to split or to retransmit.

Furthermore, PDCP 10 includes respective PDCP entities 10a, 10b,... 10n to process protocol packet data corresponding to each session. Here, the PDCP entities 10a, 10b, ... 10n preferably compress the protocol header for each session including the header compression protocol.

2 is a block diagram of a packet compression apparatus according to a preferred embodiment of the present invention. Here, the packet compression apparatus may be a terminal or a base station as a device for transmitting and receiving wirelessly.

Referring to FIG. 2, the packet compression apparatus includes a header classifier 100 and a converter 110. Here, the packet compression device is preferably implemented through the PDCP (10).

The header classifier 100 classifies a packet header of packet data received from another protocol layer into a dynamic header and a static header according to the degree of change thereof. Dynamic headers are headers whose packet data changes frequently, and static headers are headers whose packet data changes infrequently.

Here, the protocol header to be classified as a dynamic header and a static header is preferably an Internet Protocol (IP) and a user datagram protocol (UDP) header when the wireless communication network is a 3GE network. However, protocol headers classified into dynamic headers and static headers are not limited to IP and UDP headers, and various embodiments are possible when the wireless communication network is a network other than 3GE.

In other words, if the wireless communication network is a 3GE network, each protocol header may be referred to as [Internet Protocol version 4 (IPv4) and User Datagram Protocol (UDP)] or [Internet protocol version 6 ( Internet Protocol version 6, hereinafter IPv6) and UDP]. In this case, a detailed description of various embodiments of the dynamic header and the static header compressed will be described later with reference to FIGS. 4 and 5.

Meanwhile, the conversion unit 110 converts the dynamic header and the static header classified by the header classification unit 100 into at least one octet including the first octet 1, respectively. In this case, the first octet 1 is a form in which data for each field of each divided header is matched and displayed at each position of the first octet.

In other words, the first octet 1 is a binary digit group form integrated as shown in FIG. 3, and includes the same meaning as a byte when 8 bits are calculated as a bundle. At this time, whether to change data of each field of the dynamic header and the static header may be sequentially matched to each position of the first octet (1).

For example, in the case of the first octet 1 of the dynamic header, whether or not to change the data of Type of Service, which is one of the fields of the dynamic header, may be matched to the first position of the first octet 1. In this case, when the data of the Type of Service is changed, '1' is displayed at the first digit of the first octet (1), and if the data is not changed, it is displayed as '0' at the first digit of the first octet (1). desirable. Therefore, if the field-specific data of the dynamic header and the static header are not changed, the position of the first octet 1 does not include '1'.

On the contrary, when the field-specific data of the dynamic header or the static header is changed, '1' indicating the data change is displayed in the corresponding position of the first octet 1 where the field-specific data matches the changed field, and the first octet ( The changed data can be added and converted at the end of 1).

Accordingly, when converting a dynamic header and a static header into at least one octet, each header may be converted into one octet if the field-specific data of each header is not changed. This may be configured by compressing a packet header to be transmitted over the air in the case of not compressing, at least 2 octets in the case of compression.

4 is a table illustrating a compressed packet header according to an embodiment of the present invention.

Referring to FIG. 4, in order to compress a packet header of packet data to be transmitted, an IPv4 and UDP header may be classified into a static header and a dynamic header. The IPv4 and UDP classified into the static header and the dynamic header may correspond to the case where the wireless communication network is a 3GE network. Accordingly, protocol headers classified into dynamic headers and static headers are not limited to IP and UDP headers, and various embodiments are possible when the wireless communication network is a network other than 3GE.

Meanwhile, the IPv4 and UDP protocol headers divided into the dynamic header and the static header may be converted into at least one octet including the first octet. At this time, it is preferable to match each field of the first octet 1 of FIG. For example, each position of the first octet of the static header may be matched with whether or not to change data for each field below.

1. Protocol

2. Source Address

3. Destination Address

4. Source Port

5. Destination Port.

In addition, each position of the first octet of the dynamic header may be matched with whether or not to change data for each field below.

1.Type of Service

2.Time of Live

3. Identification

4. DF / RND / NBO

5. Checksum

6. SN

In this case, the number means a digit number of the first octet, and whether or not to change data for each field may be displayed by matching the digit number of the first octet (1). For example, when data of 2.Time of Live and 5. Checksum of the dynamic header is changed, the first octet of the dynamic header may be represented as '01001000'. Here, it is preferable that modified data of 2. Time of Live and 5. Checksum is added to the end of the first octet (1). On the other hand, it will be apparent to those skilled in the art that the digit of the first octet indicating whether field-specific data is changed may be implemented in various ways other than the method described above.

In this way, when matching the field-specific data of each header with each position of the first octet 1 is matched, the packet header can be compressed to only 2 octets unless the field-specific data is changed. That is, if not compressed, 13 octets (1 + 4 + 4 + 2 + 2 = 13 octets) of the static header and 9 octets (1 + 1 + 2 + 1 + 2 + 2 = 9 octets) of the dynamic header as shown in FIG. ) Can be compressed into 1 octet each.

5 is a table illustrating a compressed packet header according to another embodiment of the present invention.

Referring to FIG. 5, FIG. 5 illustrates packet headers compressed when the IPv4 and UDP headers are classified into static headers and dynamic headers, while FIG. 5 illustrates the IPv6 and UDP headers as dynamic headers and static headers. It shows the packet header to be compressed.

In this case, the IPv6 and UDP headers divided into the dynamic header and the static header may be converted into at least one octet including the first octet. It is preferable to match each field of the first octet 1 of FIG. For example, each position of the first octet of the static header may be matched with whether or not to change data for each field below.

1.Flow Lable

2.Next Header

3. Source Address

4. Destination Address

In addition, each position of the first octet of the dynamic header may be matched with whether or not to change data for each field below.

1. Traffic Class

2. Hop Limit

3. Checksum

4. SN

In this case, the number means a digit number of the first octet, and whether or not to change data for each field may be displayed by matching the digit number of the first octet (1). For example, when data of 1. Traffic Class and 4. SN of the dynamic header is changed, the first octet of the dynamic header may be expressed as '10010000'. At this time, it is preferable that modified data of 1. Traffic Class and 4. SN is added to the end of the first octet. On the other hand, it will be apparent to those skilled in the art that the digit of the first octet indicating whether field-specific data is changed may be implemented in various ways other than the method described above.

As described above, when the field-specific data change of the dynamic header and the static header is matched to each position of the first octet 1, if the field-specific data does not change, the dynamic header and the static header can be compressed to 1 octet. That is, when not compressed, 39 octets (2 + 1 + 16 + 16 + 2 + 2 = 39 octets) of the static header and 6 octets (1 + 1 + 2 + 2 = 6 octets) of the dynamic header are shown in FIG. Each can be compressed to 1 octet.

6 is a flowchart illustrating a packet compression method according to a preferred embodiment of the present invention.

Referring to FIG. 6, an apparatus for transmitting and receiving a packet wirelessly, for example, a terminal or a base station, divides a packet header to be transmitted into a dynamic header and a static header according to the degree of change (S100). In operation S110, the divided dynamic header and the static header are converted into at least one octet including the first octet 1. In this case, it is preferable that the first octet 1 is displayed by matching each field of the first octet 1 with whether to change data for each field of each header. For example, the first octet 1 may be displayed as '1' in its place when data for each field of each header is changed, and as '0' when it is not changed.

Subsequently, the apparatus for transmitting and receiving a packet wirelessly checks whether data for each field of each header has been changed (S120). At this time, if the field-specific data of the header is changed, the changed field-specific data is added to the end of the first octet (S130). If no data has been changed for each field of the dynamic header and the static header, the dynamic header and the static header can be compressed to 1 octet each.

7 is a flowchart illustrating a compressed packet transmission method according to an embodiment of the present invention.

Referring to FIG. 7, an apparatus for transmitting and receiving a packet wirelessly divides a packet header into a dynamic header and a static header according to a degree of change thereof in order to transmit a packet (S200). Subsequently, the divided dynamic header and the static header are converted into at least one octet including the first octet 1 (S210). In this case, it is preferable that the first octet 1 is displayed by matching each field with whether to change data for each field of each header.

In operation S220, the apparatus for transmitting and receiving a packet wirelessly transmits the converted at least one octet to the counterpart network apparatus. In other words, the transmitting apparatus may be a terminal and the receiving apparatus may be a base station. Alternatively, the transmitting apparatus may be a base station, and the receiving apparatus may be a terminal. In this case, the packet data may be received from an upper layer protocol, the packet header of the received packet data may be compressed, and then transmitted to the lower layer protocol. For example, packet data may be received from the IP 20 to compress the packet header, and the compressed packet header may be transmitted to the RLC 30.

8 is a flowchart illustrating a packet receiving method for recovering a compressed packet according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the apparatus for wirelessly transmitting and receiving a packet receives a packet header in which a dynamic header and a static header are converted into at least one octet including the first octet 1 (S300). In this case, it is preferable that the first octet 1 is displayed by matching each field of the first octet 1 with the change of data for each field of each header. Subsequently, the received packet header is analyzed (S310). The analysis of the packet header is a process of comparing the received packet data source and the received compressed packet data in advance.

If the data for each field of each header has not been changed as a result of the comparison (S320), the packet data is restored using the prestored packet data in accordance with the previously received and stored packet data (S330). On the contrary, if the data for each field of each header is changed as a result of the comparison (S320), the packet data may be reconstructed by receiving the field data added at the end of the first octet in advance and replacing the corresponding field of the stored packet data source (S340). ).

In other words, the apparatus for transmitting and receiving a packet wirelessly may receive compressed packet data from a lower layer protocol to restore the compressed packet header, restore the packet header of the received compressed packet data, and then transmit the received packet packet to the upper layer protocol. For example, by receiving compressed packet data from the RLC 30, the packet header may be recovered, and the recovered packet header may be transmitted to the IP 20.

In summary, as described above, an apparatus for transmitting and receiving a packet wirelessly according to a preferred embodiment of the present invention may compress a packet header to be transmitted in a wireless communication network up to two octets. Therefore, the data transmission efficiency can be improved in the wireless section. Furthermore, it is possible to effectively use the limited resources of the wireless environment, and to provide a high quality service to the user.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

The present invention can be used in the wireless communication network service technology field in which the wireless transport layer protocol optimization technique is implemented.

1 is a reference diagram for explaining a packet transmission process through packet compression according to an embodiment of the present invention;

2 is a block diagram of a packet compression apparatus according to an embodiment of the present invention;

3 is a reference diagram showing a converted first octet in accordance with a preferred embodiment of the present invention;

4 is a table illustrating a compressed packet header according to an embodiment of the present invention;

5 is a table illustrating a compressed packet header according to another embodiment of the present invention;

6 is a flowchart illustrating a packet compression method according to a preferred embodiment of the present invention;

7 is a flowchart illustrating a compressed packet transmission method according to an embodiment of the present invention;

8 is a flowchart illustrating a packet receiving method for recovering a compressed packet according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: PDCP 20: IP

30: RLC 100: header classification unit

110: converting unit 1: first octet

Claims (7)

In the packet compression method of the apparatus for transmitting and receiving packets wirelessly, Dividing a packet header to be transmitted into a dynamic header and a static header according to its varying degree; And And converting the divided dynamic headers and static headers into at least one octet including a first octet indicated by whether each field of the header changes data. The method of claim 1, The converting of the at least one octet may include converting each header into one octet if the field-specific data of the dynamic header and the static header are not changed. The method of claim 1, The converting into the at least one octet may indicate whether the field-specific data is changed in place of the first octet matching the changed field when the field-specific data of each header is changed. A packet compression method comprising converting the changed data at the end. The method of claim 1, The packet header of the step of converting to at least one octet is a packet compression method, characterized in that the user datagram protocol and the Internet protocol header. The method of claim 1, The converting into at least one octet may include converting the separated dynamic header and the static header into at least one octet through a ROHC or RFC2507 protocol. In the packet transmission method of the device for transmitting and receiving packets wirelessly, Dividing the packet header to be transmitted to the counterpart network device into a dynamic header and a static header according to a degree of change thereof; Converting the divided dynamic headers and static headers into at least one octet including a first octet indicated by matching each field of data of each header with each field; And And transmitting the converted at least one octet to the counterpart network device. In the packet receiving method of the apparatus for transmitting and receiving packets wirelessly, Receiving and analyzing, from the partner network device, a packet header converted into at least one octet including a first octet displayed by matching whether each field of the dynamic header and the static header has changed; And Restoring packet data using previously received and stored packet data if the field-specific data of the first octet is not changed based on the analysis result, and using field data added to the end of the first octet if changed. Packet receiving method characterized in that.

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