KR20090025914A - Method and apparatus for transmitting data in a communication sysyen - Google Patents

Abstract

A method and an apparatus for transmitting data in a communication system are provided to reduce a signaling overhead by reducing a transmission of a PHSP(Payload Header Suppression Profile) information element. A terminal confirms a generation of a traffic to be transmitted(S400), and transmits a DSA(Dynamic Service Addition)-RSQ message including a PHSP to a base station(S410). One bit PHSP information indicates byte information corresponding to a PHSS(PHS Size), a PHSM(PHS Mask), and a PHSV(PHS Valid). The terminal receives a DSA-RSP from the base station(S420), and receives a DSA-ACK message from the base station(S430).

Description

METHOD AND APPARATUS FOR TRANSMITTING DATA IN A COMMUNICATION SYSYEN}

The present invention relates to a method and apparatus for transmitting and receiving data by concealing data transmitted redundantly in a communication system.

Recently, as an example of a broadband high-speed transmission system for physically transmitting a large amount of data, IEEE 802.16, Wireless Broadband Internet (WiBro), and the like have a large overhead incurred in an upper layer or a medium access control (MAC).

In other words, the overhead is increased as much as the amount of data transmission, so the throughput for transmitting the actual data is not much lower than the transmission capacity supported by the physical layer. In particular, in case of a real time short packet such as voice over internet protocol (VoIP) which has a small amount of information but periodically generates data, the overhead incurred during data transmission is very large, about 20% to 200% of the actual data length. A payload header is sent with the data in every packet.

IEEE 802.16 uses Payload Header Suppression (PHS) as one of the measures to reduce the overhead. The PHS scheme establishes a connection with a base station by performing a procedure called dynamic service addition (DSA) before the UE transmits a packet. Thereafter, the terminal removes the header portion of the upper traffic that is duplicated in each of the consecutively generated packets and transmits the header portion to the base station, and the received base station restores the header portion of the removed payload. Therefore, when transmitting a short packet such as VoIP traffic using PHS, MAC throughput can be greatly improved by removing all payload headers present in every packet.

However, the PHS scheme has a problem in that an overhead exists in a signaling process performed before concealing the payload header unit. That is, the UE must perform a DSA procedure whenever a new kind of traffic occurs, and exchange PHS element information through MAC management messages. In addition, the information contained in the MAC management messages is so large that it is several hundred bytes in size. In this case, there is a problem that causes fragmentation of the MAC management message, thereby complicating the implementation.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is to provide a method and apparatus for reducing the amount of information used for PHS signaling.

The transmission method according to an embodiment of the present invention is a method for transmitting data in a communication system. Transmitting a dynamic service addition (DSA) request message including a PHS profile (PHSP) represented by bit information corresponding to each byte of at least one element of an element to the base station, and a DSA response message from the base station. Receiving a, wherein the element includes a PHSS (PHS Size), PHSM Mask (PHSM) and PHSV (PHS Valid).

In a receiving method according to an embodiment of the present invention, in a method of receiving data in a communication system, at least one element of a plurality of elements for applying a terminal and a predefined payload header concealment (PHS) Receiving a dynamic service addition (DSA) request message including a PHS profile (PHSP) represented by bit information corresponding to each byte from the terminal, transmitting a DSA response message to the terminal, and then The method includes transmitting a response message for reception, and includes a PHS size (PHSS), a PHS mask (PHSM), and PHS valid information (PHSV).

A terminal according to an embodiment of the present invention is a terminal for transmitting data in a communication system. When data to be transmitted is generated, a base station and a plurality of predefined elements are applied to apply a payload header concealment (PHS) of the data. send a Dynamic Service Addition (DSA) request message including a PHS Profile (PHSP) indicated by bit information corresponding to each byte of at least one element of the element to the base station, receive a DSA response message from the base station, and The element is characterized in that it comprises a PHS size (PHSS), a PHS mask (PHSM) and PHS valid information (PHSV).

A base station according to an embodiment of the present invention is a base station receiving data in a communication system, the terminal and at least one of a plurality of elements for applying a payload header concealment (PHS) of the predefined data After transmitting to the terminal a DSA response message including a PHS profile (PHSP) indicated by bit information corresponding to each byte of the element, the response message for receiving the DSA response message is transmitted, and the element is a PHS size ( PHSS), PHS mask (PHSM) and PHS valid information (PHSV).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common knowledge in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those who have

The present invention can reduce the signaling overhead by reducing the transmission of the PHSP information element by newly defining the PHSP, and at the same time, reduce the size of the MAC management messages, thereby simplifying the complicated implementation due to the divided MAC management messages. have.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

1 is a flow diagram of a DSA to which a general PHS is applied.

Referring to FIG. 1, in step 120, the terminal 100 transmits a registration request (REG-REQ) message indicating whether the terminal 100 can be supported to the base station 110.

When the terminal 100 supports the PHS, in step 130, the terminal 100 transmits a DSA-REQ message requesting the DSA to the base station 110 whenever new traffic is generated. In this case, the DSA-REQ encodes the PHS elements PHSS (PHS size), PHSM (PHS mask), PHSF (PHS field), PHSV (PHS verification) in the form of TLV (type-length-value) and transmits them together. .

In step 140, the base station 110 responds to the DSA request and transmits a DSA-RSP message including CID (connection identification) and PHSI (PHS identification) allocated to the generated traffic to the terminal 100. . In step 150, the terminal 100 transmits a DSA_ACK to the base station 110 indicating that the terminal has properly received the DSA-RSP message.

The REG-REQ, DSA-REQ, DSA-RSP, and DSA_ACK messages exchanged between the terminal 100 and the base station 110 during the DSA procedure as described above are MAC management messages.

The PHS element includes a PHSS size (PHSS size), a PHSM mask (PHSM), a PHSF field (PHS field), a PHSV (PHS verification), and a PHSI (PHS identification).

① The PHSF is a snapshot of the uncompressed payload header that includes the hidden and unhidden portions.

② PHSM is a bit mask indicating the bytes hidden in PHSF.

(3) The PHSV is an entity transmitted to verify all concealed bytes, i.e., whether the information concealed at the transmitting side and the information recovered at the receiving side correspond.

(4) PHSS is the total hidden payload header size in bytes, equal to the length of PHSF, PHSM and PHSV.

PHSI is an 8-bit value representing a hidden string of bytes and represents an index of the PHSS, PHSM, PHSF, and PHSV.

The present invention further defines a PHSP (PHP Profile) for reducing signaling of a DSA procedure performed whenever a new traffic occurs in a terminal as shown in FIG. 2. In addition, the terminal and the base station share the PHS elements with each other using the PHS signaling protocol in advance in order to remove the payload header portion that is duplicated each time traffic occurs.

Specifically, the PHSP serves as a criterion for classifying the traffic generated in the upper layer by type, and a payload header stack is used as the traffic classification criterion.

2 is a table showing an example of a PHSP definition according to an embodiment of the present invention.

Referring to FIG. 2, a PHSS is defined according to a payload stack structure and includes a PHSS, which is a total size of a payload header represented by a byte unit, and a PHSM mapped to one bit per byte of the PHSS. If the bit information of the PHSM is '1', it indicates that the byte information of the corresponding payload header can be omitted, and if it is '0', it indicates that the byte information of the corresponding payload header cannot be omitted.

PHSP # 0 is a profile used to conceal only an Ethernet header of 14 bytes, and PHSS has a total of 14 bytes, and has a PHSM to which 1 bit is mapped per 1 byte of the 14 bytes. Specifically, the upper 6 bytes of the Ethernet header indicates the base station MAC address, and the next 6 bytes indicate the MAC address of the terminal. Finally, the lower 2 bytes are Ether-Type fields indicating the protocol type of the upper layer. Therefore, when a connection is established between the terminal and the base station through a DSA procedure, the MAC address of the terminal and the MAC address of the base station will not change. In this case, by applying the PHSP # 0, it is possible to remove all Ethernet MAC header of the traffic generated in the terminal.

 PHSP # 1 is a profile used for concealing a 34-byte Ethernet / IPv4 header, which has a total PHSS of 34 bytes, and has a PHSM in which one bit of each of the 34 bytes is mapped in the form of FIG. 2. At this time, the bit of the PHSM is '0' indicates information that can be changed for each traffic generated in the same connection, such as a length field and a header checksum.

PHSP # 2 is a profile used for concealing 42-byte Ethernet / IPv4 / UDP-real time headers, and has a PHSS of 42 bytes in total and 1 byte of each of the 42 bytes maps to 1 bit.

PHSP # 3 is a profile used for concealing 42-byte Ethernet / IPv4 / ARP headers, and has a PHSS of 42 bytes in total and 1 byte of each of the 42 bytes is mapped to 1 bit.

PHSP # 4 is a profile used for concealing a 54 byte Ethernet / IPv4 / TCP header, which has a total PHSS of 54 bytes, and has a PHSM in which one bit of each of the 54 bytes is mapped in the form of FIG. 2.

As an example, if PHSP # 2 is applied when the VoIP traffic to be transmitted from the terminal is applied, all 1s are mapped to the 42-bit PHSM, so that all 42 bytes of the Ethernet / IPv4 / UDP header part may be removed and only the actual data portion may be transmitted. Throughput is improved.

3 is a flowchart illustrating a DSA to which a PHSP is applied according to an embodiment of the present invention. Here, it is assumed that the terminal 300 is a PHS applicable terminal, and the PHSP defined as shown in FIG. 2 is previously defined between the terminal 300 and the base station 310.

Referring to FIG. 3, whenever new traffic is generated, the terminal 300 transmits a DSA-REQ message requesting the DSA to the base station 310 in step 320. At this time, the DSA-REQ includes PHSP and PHSF. Specifically, the size of the PHSM is calculated as ceil [PHSS value / 8] bytes. Therefore, since PHSP # 0 is ceil [14/8] = 2 bytes, when the PHSP is applied to traffic having an Ethernet header, the terminal 300 includes 1 byte of PHSS except for PHSF in a DSA-REQ message, A total of 4 bytes of PHS element information including 2 bytes of PHSM and 1 byte of PHSV is transmitted to the base station 310.

In the case of PHSP # 4, ceil [54/8] is 7 bytes. Therefore, when applying PHSP to traffic having a payload header stack of Ethernet / IPv4 / TCP, the terminal 300 excludes PHSF from the DSA-REQ message. And a total of 9 bytes of PHS element information including 1 byte of PHSS, 2 bytes of PHSM, and 1 byte of PHSV.

In step 330, the base station 310 responds to the DSA request and transmits a DSA-RSP message including the CID and PHSI allocated to the generated traffic to the terminal 300. In step 340, the terminal 300 transmits a DSA_ACK to the base station 310 indicating that the terminal has properly received the DSA-RSP message.

As described above, when the PHSP is applied to the PHS scheme, 1-bit PHSP information indicates corresponding byte information of PHSS, PHSM, and PHSV. Accordingly, the overhead required for signaling may be reduced by transmitting a DSA-REQ message including a PHSP represented by bit information corresponding to each byte of PHSS, PHSM, and PHSV.

Thereafter, the base station 310 may generate PHSS and PHSM fields corresponding to PHSP information previously determined with the terminal.

4 is an operation flowchart of a terminal according to an embodiment of the present invention. Here, it is assumed that the terminal is a PHS applicable terminal.

Referring to FIG. 4, in step 400, the terminal determines whether traffic to be transmitted has occurred. If the check result occurs, in step 410, the terminal transmits a DSA-RSQ message including a PHSP to the base station and proceeds to step 420. The PHSP is predetermined between the terminal and the base station, and 1-bit PHSP information indicates corresponding byte information of PHSS, PHSM, and PHSV.

In step 420, the terminal receives the DSA-RSP from the base station, and in step 430 receives a DSA-ACK message.

1 is a flow diagram of a DSA to which a general PHS is applied.

2 is a table showing an example of a PHSP definition according to an embodiment of the present invention.

3 is a DSA flowchart to which a PHSP is applied according to an embodiment of the present invention.

4 is an operation flowchart of a terminal according to an embodiment of the present invention.

Claims (18)

In a method for transmitting data in a communication system, When data to be transmitted is generated, in order to apply a payload header concealment (PHS) of the data, a PHSP (PHS) represented by bit information corresponding to each byte of at least one element of the base station and a plurality of predefined elements Transmitting a Dynamic Service Addition (DSA) request message including a Profile) to the base station;  Receiving a DSA response message from the base station, The element includes a PHSS Size (PHSS Size), a PHSM Mask (PHSM Mask), and a PHSV (PHS Valid). The method of claim 1, wherein the DSA response message, And a connection identifier between the base station and a PHSI (PHS Index). The method of claim 1, wherein the PHSP, The payload header is classified according to the payload header stack and 1 bit is mapped to indicate whether the corresponding payload header information is hidden per byte of the payload header size (PHSS) for each classified payload header stack. And a masking information (PHSM). The method of claim 2, If the bit of the PHSM is 1, the byte information of the corresponding payload header is concealed. If the bit of the PHSM is 0, the byte information of the corresponding payload header is concealable. Transmission method. In a method for receiving data in a communication system, Dynamic service addition (DSA) including a PHS profile (PHSP) represented by bit information corresponding to each byte of at least one element of a plurality of elements for applying a terminal and a predefined payload header concealment (PHS) Receiving a request message from the terminal; Transmitting a response message for receiving the DSA response message after transmitting a DSA response message to the terminal; A method of receiving data comprising PHS size (PHSS), PHS mask (PHSM) and PHS valid information (PHSV). The method of claim 4, wherein the DSA response message,  A data receiving method comprising a PHSI (PHS Index) and a connection identifier between the base station The method of claim 5, wherein the PHP profile, The payload header masking classifies the generated data according to the payload header stack and maps one bit indicating whether the corresponding payload header information is hidden per byte of the payload header size (PHSS) for each classified payload header stack. And information (PHSM). The method of claim 7, wherein If the bit of the PHSM is 1, the byte information of the corresponding payload header is concealed. If the bit of the PHSM is 0, the byte information of the corresponding payload header is concealable. Receiving method. The method of claim 7, wherein Generate a payload header represented by a PHSS and a PHSF (PHS field) having a size mapped to 1 byte per 1 bit of the PHSM, and check each bit of the PHSM to restore byte information of the corresponding payload header A data receiving method characterized by the above-mentioned. A terminal for transmitting data in a communication system, When the data to be transmitted is generated, a PHS profile represented by bit information corresponding to each byte of at least one element of the base station and a plurality of predefined elements in order to apply the payload header concealment (PHS) of the data ( Send a Dynamic Service Addition (DSA) request message to the base station, receive a DSA response message from the base station, The element comprises a PHS size (PHSS), a PHS mask (PHSM) and PHS valid information (PHSV). The method of claim 10, wherein the DSA response message, Terminal comprising a PHSI (PHS Index) and the connection identifier between the base station. The method of claim 10, wherein the PHP profile, The payload header masking classifies the generated data according to the payload header stack and maps one bit indicating whether the corresponding payload header information is hidden per byte of the payload header size (PHSS) for each classified payload header stack. Terminal comprising the information (PHSM). The method of claim 12, A bit of the PHSM indicates that the byte information of the corresponding payload header can be concealed. A bit of the PHSM indicates that the byte information of the corresponding payload header cannot be concealed. . A base station for receiving data in a communication system, For applying a payload header concealment (PHS) of the terminal and the predefined data A response message for receiving the DSA response message including a PHS profile (PHSP) indicated by bit information corresponding to each byte of at least one element of a plurality of elements to the terminal, and then receiving the DSA response message Send, The element includes a PHS size (PHSS), a PHS mask (PHSM) and PHS valid information (PHSV). The method of claim 14, wherein the DSA response message, A base station comprising a PHSI (PHS Index) and a connection identifier between the base station. The method of claim 14, wherein the PHP profile, The payload header masking classifies the generated data according to the payload header stack and maps one bit indicating whether the corresponding payload header information is hidden per byte of the payload header size (PHSS) for each classified payload header stack. A base station comprising information (PHSM). The method of claim 16, If the bit of the PHSM is 1 indicates that the byte information of the corresponding payload header can be concealed, If the bit of the PHSM is 0 indicates that the byte information of the corresponding payload header can not be concealed . The method of claim 17, Generate a payload header represented by a PHSS and a PHSF (PHS field) having a size mapped to 1 byte per 1 bit of the PHSM, and check each bit of the PHSM to restore byte information of the corresponding payload header Characterized by a base station.

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