KR20090036187A - Apparatus and method for generating pdu in mobile communication system - Google Patents

Apparatus and method for generating pdu in mobile communication system Download PDF

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Publication number
KR20090036187A
KR20090036187A KR1020070101219A KR20070101219A KR20090036187A KR 20090036187 A KR20090036187 A KR 20090036187A KR 1020070101219 A KR1020070101219 A KR 1020070101219A KR 20070101219 A KR20070101219 A KR 20070101219A KR 20090036187 A KR20090036187 A KR 20090036187A
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KR
South Korea
Prior art keywords
burst
headers
data unit
header
information
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KR1020070101219A
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Korean (ko)
Inventor
장재환
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삼성전자주식회사
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Priority to KR1020070101219A priority Critical patent/KR20090036187A/en
Publication of KR20090036187A publication Critical patent/KR20090036187A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

An apparatus and method for generating PDU in a mobile communication system is provided to extract a protocol data unit by making the number of a head included in map information. A transmission device comprises a header generator and a burst generating unit. A header generator(201) comprises MAC headers including information of the service data unit, and a burst generating unit(203) classifies the service data unit corresponding to the headers and payload and classified Headers are arranged to at the front of the burst. The transmission device produces the map information reporting on the information about the headers of burst and service data unit. The map information includes the information one of the header number within burst and modulation system and coding rate.

Description

Apparatus and method for generating protocol data unit in mobile communication system {APPARATUS AND METHOD FOR GENERATING PDU IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to data communication in a wireless communication system, and when receiving a burst including a plurality of protocol data units (PDUs), the protocol data unit can be extracted according to an error occurring in a specific header. An apparatus and method are provided for placing headers for data units in front of burst data in order to solve the missing problem.

A wireless communication system, in particular a broadband wireless communication system, is composed of three layers. The first layer is a physical layer that is in charge of wireless transmission, and the second layer is a radio link control (RLC) layer that is responsible for reliable data transmission and efficiently provides a plurality of services simultaneously. It consists of Medium Access Control Layer (MAC) that is responsible for the functions. The third layer includes a call control layer (CC) for call setup and release, a mobility management layer (MM) for authentication and registration of service users, and a radio for radio resource allocation and management. It consists of a resource control (RRC) layer.

In the broadband wireless communication system as described above, the transmitting side continuously transmits several MAC PDUs in one burst through the physical layer. Then, the receiving side must separate the PDUs in one burst.

However, the number of protocol data units (PDUs) concatenated in one burst, the size of the protocol data units, and the like are unknown to the receiving apparatus. Therefore, the receiving device merely reads the first header and finds out the size of the protocol data unit to separate the protocol data unit, and determines that the data after that is the header of the new protocol data unit. The size of the new protocol data unit is found in the header and the new protocol data unit is separated out.

1 illustrates a structure of a burst in a general mobile communication system. In a typical broadband wireless communication system, the transmitting side continuously transmits data of protocol data units (PDUs) of various sizes made from various connected portable terminals, for example, in accordance with the burst size allocated by the specification.

Referring to FIG. 1, the protocol data unit 100 includes a MAC header portion 103 and a payload portion 105. The MAC header 103 has information about the size of the protocol data unit 100, and the size of the protocol data unit 100 is different for each protocol data unit. The receiving device may know the size of the payload 105 by looking at the size of the protocol data unit 100 included in the header 103. The payload portion 105 includes CRC information for error checking.

In addition, a map is generally transmitted using a predetermined modulation scheme and a code rate, or a map is divided into multiple stages, and the first map is transmitted using a predetermined modulation scheme and a coding rate. Subsequent maps tell the modulation scheme and coding rate in the first map.

The receiving apparatus checks a kind of cyclic redundancy check (CRC) code called a header check sum (HCS) of the header 103 to determine whether there is an error in the header 103.

If it is determined that there is no error of the header 103, the receiving device uses the length information of the protocol data unit 100 included in the header 103 to terminate the protocol data unit 100. The CRC code in the portion is used to determine whether there is a reception error in the protocol data unit 100, and if there is no error, the information is sent to a higher layer. The following information is another header 103, so the foregoing process is repeated.

On the other hand, when it is determined that there is an error in the header 103, the receiving device may recover the contents of the protocol data unit 100 because the length of the protocol data unit 100 located in the burst is unknown. There is no problem. In other words, the receiver should discard the burst if the protocol data unit 100 cannot be separated due to an error in the header 103.

In order to solve the above problems, when an error of the header 103 occurs, a method of causing the HCS to find an error-free part immediately afterwards and confirming the position of the next header 103 (continuous data in a wireless communication system A method and apparatus for generating a unit of data for transmission and a unit receiving method and apparatus and a data burst structure thereof (10-2004-0017101) have been proposed.

However, the above method limits the length of the protocol data unit 100 to be an integer multiple of a specific length to shorten the time for detecting the header 103, but the length of the protocol data unit 100 has a specific length. There is a problem in that it should be limited to an integer multiple, and a delay time will occur as the header is detected by performing the HCS several times.

Accordingly, what is needed is an apparatus and method for extracting protocol data units from a burst that includes protocol data units for solving such problems.

SUMMARY OF THE INVENTION The present invention was derived to solve the above problems, and an object of the present invention is to provide an apparatus and method for extracting a protocol data unit from a burst including a plurality of protocol data units.

Another object of the present invention is to provide a transmitting apparatus and a transmitting method for generating and generating a map including header information when generating bursts separately in burst generation in a mobile communication system.

Another object of the present invention is to provide a receiving apparatus and a receiving method for checking the number of headers in a burst using map information in a mobile communication system.

According to a first aspect of the present invention for achieving the above objects, a transmitting apparatus for generating a burst including a MAC protocol data unit (PDU) is a service data unit (SDU). A header generation unit for generating MAC headers including information of a) and a burst generation for classifying the headers and a service data unit corresponding to the payload, and then collecting the classified headers separately and placing them in front of the burst It is characterized by including a wealth.

According to a second aspect of the present invention for achieving the above objects, a receiving apparatus for extracting a data unit from a receiving burst analyzes map information when receiving a burst to check the number of headers present in the burst. And a map analyzing unit, a header extracting unit for classifying the identified number of headers and data units, and an HCS check unit for determining whether there is an error with the classified headers.

According to a third aspect of the present invention for achieving the above objects, a method for generating a burst including a MAC protocol data unit (PDU) in a transmitting apparatus includes a service data unit (SDU). Classifying the MAC headers and the service data unit corresponding to the payload, and generating the bursts by collecting and classifying the classified headers in front of the bursts. It is done.

According to a fourth aspect of the present invention for achieving the above objects, a method for extracting a data unit from a burst received by a receiving apparatus includes analyzing map information when a burst is received to identify the number of headers present in the burst. And classifying the identified number of headers, and extracting a data unit by determining whether there is an error with the classified headers.

As described above, the present invention collects headers corresponding to the payload separately in front of the burst when generating burst data, classifies and combines the payload separately from the header, and maps the payload and the header to the map information. By processing to include the number of the header can solve the conventional problem that can not extract the protocol data unit due to the error of a specific header.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing 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.

The present invention provides an apparatus and method for separately gathering headers corresponding to MAC PDUs and placing them in front of a burst when generating a frame including MAC Protocol Data Units (PDUs) in a mobile communication system. Will be explained.

2 is a diagram illustrating a configuration of a transmitting apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the transmitter 200 may include a header generator 201, a burst generator 203, and a data transmitter 205.

First, the header generation unit 201 of the transmitting device 200 includes a MAC header including information (LCID information, length information, etc.) of a MAC service data unit (SDU) to be transmitted. Create

The burst generating unit 203 processes to generate burst data combining a MAC header and a payload of data to be transmitted in a predetermined method. In other words, the burst generation unit 203 does not generate a MAC PDU by combining headers corresponding to respective payloads when generating a conventional burst, and according to the present invention, headers corresponding to the payloads are placed in front of the burst. Collected separately, the payload is processed to be classified and combined with the header separately.

The transmitting device 200 generates a map for notifying information about the header and the payload of the burst. Here, the map includes information on the number of headers in the burst, a modulation scheme, and a coding rate. Details of the map will be described in detail with reference to FIGS. 6 to 7 below. In addition, the transmitting apparatus 200 processes the headers to be transmitted to the receiving apparatus by applying a modulation scheme or encoding rate that is more robust than the payload. For example, the transmitter 200 may predefine or use one or two more robust modulation schemes and coding rates in the modulation scheme and the code rate table shared by the transmitter 200 and the receiver. The information may be added to the map and transmitted to the receiving device.

The data transmitter 205 processes the burst data generated by the burst generator 203 to transmit.

3 is a block diagram illustrating a configuration of a receiving apparatus for extracting a data unit from a received burst according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the receiving apparatus 300 includes a data receiver 301, a map (MAP) analyzer 303, a header extractor 305, an SDU detector 307, and an HCS checker. 309 can be configured to include.

The data receiver 301 receives burst data transmitted from the transmitter 200. Here, the burst data is a burst in which headers corresponding to the payload are located in front of the burst, and the payload is combined in a state classified separately from the header according to the present invention. It will be explained in detail.

The map analyzer 303 may analyze the map information provided from the transmission apparatus 200 and check the number of headers present in the burst data, information on a modulation scheme, and a coding rate. The header extractor 305 may extract a header included in the burst data by using map analysis information by the map analyzer. That is, the header extractor 305 classifies the header and the payload in the burst data.

The HCS checker 309 checks a CRC (Cyclic Redundancy Check) code of a header check sum (HCS) included in each header to determine whether there is a reception error of the corresponding header.

The SDU detection unit 307 classifies the service data unit included in the burst using the header included in the burst data.

4 is a flowchart illustrating a burst generation process of a transmitting apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the transmitter 200 first checks whether a burst generation event occurs in step 401.

If the burst generation event does not occur, the transmitter 200 repeats the process of step 401.

On the other hand, when the burst generation event occurs, the transmission device 200 proceeds to step 403 and information about a MAC service data unit (SDU) to be transmitted by the header generation unit 201. Instructs to generate a MAC header including (LCID information, length information, etc.).

In step 405, the transmitting apparatus 200 classifies the service data unit corresponding to the header and the payload, and in step 407, the burst generating unit 203 causes the classified headers to burst. To be placed in front of the handle. That is, the burst generation unit 203 may process the headers by collecting the headers in front of the burst and the service data unit by collecting the headers in the rear of the burst.

In operation 409, the transmitter 200 completes the burst generation process by the burst generator 203.

Thereafter, the transmitting device 200 ends the present algorithm.

5 is a flowchart illustrating a process of extracting a data unit from a burst received by a receiving apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the reception device 300 first receives a burst transmitted by the transmission device 200 in step 501, and then proceeds to step 503 and causes the map analyzer 303 to transmit the transmission device ( Process to analyze the map information provided from 200). Here, the map information further includes a field including existing map information, the number of headers present in the burst data, and information on a modulation scheme and a coding rate.

In operation 505, the receiving apparatus 300 determines the number of headers present in the burst using the map information analyzed by the map analyzer 303, and then proceeds to operation 507. Extract the number of headers.

In step 509, the receiving apparatus 300 performs an HCS check process for checking the errors of all the headers by the HCS checker 309, and then proceeds to step 511. Check if it detects Here, the HCS checker 309 may determine whether there is a reception error of a corresponding header by checking a kind of a cyclic redundancy check (CRC) code called a header check sum (HCS) included in each header.

If the error header is not detected, the receiving device 300 proceeds to step 517 and extracts a service data unit existing in the burst.

On the other hand, when detecting the header in error, the receiving device 300 proceeds to step 513 and discards the corresponding header in error, and proceeds to step 515 whether the HCS check process for all headers is performed. Check it.

If it is confirmed that the HCS check process is not performed for all the headers, the receiving device 300 repeats the process of step 509.

On the other hand, when confirming that the HCS check process has been performed for all the headers, the receiving device 300 ends the present algorithm.

6 is a diagram illustrating a structure of burst data according to an exemplary embodiment of the present invention. Here, it will be described on the assumption that the burst data is generated in a state in which the modulation method and the coding rate of headers are previously defined between the transmitter and the receiver.

Referring to FIG. 6, the burst data includes three headers 601, 603, and 605 and three payloads 607, 609, and 611 that include a service data unit. have. The burst data according to the present invention, unlike the conventional burst data combined with the header and the payload for the header, gathers all the headers 601, 603, and 605 separately so that they are located in front of the burst. Payloads 607, 609, and 611 for the headers are located.

After generating the burst data as described above, the transmitter generates a map 620 including a field 623 indicating the number of headers. That is, the map 620 includes map information 621 of the conventional burst data and information 623 indicating the number of headers.

Accordingly, the receiving apparatus can check the map information to identify the number of headers in the burst data and the payload corresponding to the headers, thereby solving the problem of the failure of the payload positioning due to the header error.

7 is a diagram illustrating a configuration of burst data according to another exemplary embodiment of the present invention.

Referring to FIG. 7, the burst data includes three headers 701, 703, and 705 and three payloads 707 and 709 as described in FIG. 6. , 711.

In the transmitting apparatus according to the present invention, after generating the burst data as described above, the modulation scheme and the coding rate of the headers are included in a map as shown in FIG. 6, that is, a map including a field 723 indicating the number of headers. Create a map 720 that includes the information 725. That is, the map 720 includes map information 721 of conventional burst data, the number of headers 723, and information 725 indicating a modulation scheme and a coding rate of the header.

Accordingly, the receiving apparatus can check the map information to check the number of headers in the burst data, information on the modulation scheme and the coding rate of the headers.

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 view showing the structure of a burst (burst) in a typical mobile communication system,

2 is a diagram showing the configuration of a transmitting apparatus according to an embodiment of the present invention;

3 is a block diagram showing a configuration of a receiving apparatus for extracting a data unit from a burst received according to an exemplary embodiment of the present invention;

4 is a flowchart illustrating a burst generation process of a transmitting apparatus according to an embodiment of the present invention;

5 is a flowchart illustrating a process for extracting a data unit from a burst received by a receiving apparatus according to an exemplary embodiment of the present invention;

6 is a diagram illustrating a structure of burst data according to an embodiment of the present invention;

7 is a diagram illustrating a configuration of burst data according to another exemplary embodiment of the present invention.

Claims (12)

A transmitting device for generating a burst including a MAC protocol data unit (PDU), comprising: A header generator for generating MAC headers including information of a service data unit (SDU), And a burst generation unit configured to classify the headers and the service data unit corresponding to the payload, and to process the classified headers separately in front of the bursts. The method of claim 1, The transmitting apparatus for generating a burst including the MAC protocol data unit (PDU), And map information for notifying headers of the burst and information about the service data unit. The method of claim 2, The map information, And at least one of the number of headers in the burst, information on a modulation scheme, and a coding rate. A receiving apparatus for extracting a data unit from a receiving burst, A map analyzer for analyzing the map information when receiving the burst and checking the number of headers present in the burst; A header extractor for classifying the identified number of headers and data units; And an HCS checker to determine whether there is an error with respect to the classified header. The method of claim 4, wherein A receiving device for extracting a data unit from the receiving burst, And determining that there is no error for the header, further comprising the data unit detector using the header information. The method of claim 4, wherein The map information, And at least one of the number of headers in the burst, information on a modulation scheme, and a coding rate. 10. A method for generating a burst comprising a MAC Protocol Data Unit (PDU) at a transmitting device, the method comprising: Classifying MAC headers including information of a service data unit (SDU) and a service data unit corresponding to a payload; And generating the burst by collecting and sorting the classified headers in front of the burst. The method of claim 7, wherein A method for generating a burst comprising a MAC protocol data unit at the transmitting device, Generating map information informing of headers of the burst and information about the service data unit. The method of claim 8, The map information, And at least one of the number of headers in the burst, information on a modulation scheme, and a coding rate. A method for extracting a data unit from a burst received at a receiving device, the method comprising: Analyzing the map information upon receiving the burst and checking the number of headers present in the burst; Classifying the identified number of headers; And extracting a data unit by determining whether there is an error for the classified header. The method of claim 10, Method for extracting a data unit from the burst received by the receiving device, If it is determined that an error exists in the header, discarding the header in which the error occurs; And if it is determined that no error exists for the header, extracting the data unit using the header information. The method of claim 10, The map information, And at least one of the number of headers in the burst, information on a modulation scheme, and a coding rate.
KR1020070101219A 2007-10-09 2007-10-09 Apparatus and method for generating pdu in mobile communication system KR20090036187A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11102088B2 (en) 2017-02-14 2021-08-24 Lsis Co., Ltd. Communication data modeling method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11102088B2 (en) 2017-02-14 2021-08-24 Lsis Co., Ltd. Communication data modeling method

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