KR20040077348A - Sdu processing method for umts - Google Patents

Sdu processing method for umts Download PDF

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KR20040077348A
KR20040077348A KR1020030012872A KR20030012872A KR20040077348A KR 20040077348 A KR20040077348 A KR 20040077348A KR 1020030012872 A KR1020030012872 A KR 1020030012872A KR 20030012872 A KR20030012872 A KR 20030012872A KR 20040077348 A KR20040077348 A KR 20040077348A
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sdu
mode
timer
pdu
disused
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KR1020030012872A
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Korean (ko)
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김형록
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엘지전자 주식회사
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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
    • H04L69/30—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
    • H04L69/321—Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/32—Flow control; Congestion control by discarding or delaying data units, e.g. packets or frames

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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

PURPOSE: A method for processing an SDU(Service Data Unit) of an UMTS(Universal Mobile Telecommunications System) is provided to perform smoothly a communication process between a transmitting end and a receiving end by selecting a disuse method according to kinds of RB and kinds of data. CONSTITUTION: An SDU is disused at a TM(Transparent Mode) and an UM(Unacknowledged Mode) of an SRB(Signaling Radio Bearer) on the basis of a timer and a signaling process is not performed(S1-S3). A PDU(Protocol Data Unit) is transmitted as much as a retransmitting number at an AM(Acknowledge Mode) of the SRB and the SDU is not disused(S4). The SDU is disused on the basis of the timer and the signaling process is not performed when an RB is a traffic data transmission mode and an RLC mode is the TM or the UM(S5,S6). The SDU is disused after the PDU is transmitted as much as possible number or the SDU is disused on the basis of the timer and the signaling process is performed when the RB is the traffic data transmission mode and the RLC mode is the AM(S7).

Description

유엠티에스의 에스디유 처리방법{SDU PROCESSING METHOD FOR UMTS}SDU PROCESSING METHOD FOR UMTS}

본 발명은 3GPP 비동기식(UMTS: Universal Mobile Telecommunications System) 이동통신 시스템의 알엘씨 레이어(RLC Layer) 상에서 피디유(PDU: Protocol Data Unit)가 수신되지 않을 때 에스디유(SDU: Service Data Unit)를 처리하는 기술에 관한 것으로, 특히 RLC 레이어 상에서 송신단과 수신단 사이에 주고 받는 PDU의 순서를 계산하여 약속된 시점에서 그 PDU가 수신되지 않은 경우, SDU를 상황에 따라 적응적으로 처리할 수 있도록 한 유엠티에스의 에스디유 처리방법에 관한 것이다.The present invention processes a service data unit (SDU) when a protocol data unit (PDU) is not received on an RLC layer of a 3GPP Universal Mobile Telecommunications System (UMTS) mobile communication system. The present invention relates to a technology for performing a PDU, in particular, an order of PDUs exchanged between a transmitting end and a receiving end on an RLC layer, and when the PDU is not received at a promised time, the UDU can be adaptively processed according to a situation. It relates to the processing of SD oil of S.

일반적으로, UMTS의 RLC 레이어 상에서 송신단과 수신단 사이에 PDU를 주고 받게 된다. 그런데, 3GPP TS 25.322에 의하면 송신단과 수신단 사이에 약속된 시간 또는 약속된 횟수에 도달된 후에도 PDU가 수신되지 않는 경우, 몇가지 처리 방법중 그들간의 약속된 방법으로 SDU를 처리(discard)하게 되어 있었다.In general, a PDU is exchanged between a transmitter and a receiver on the RLC layer of UMTS. However, according to 3GPP TS 25.322, when the PDU is not received even after the time or the promised number of times between the transmitting end and the receiving end is reached, the SDU is discarded by the promised method among several processing methods.

이와 같이 종래의 UMTS에 있어서는 송신단과 수신단 사이에 약속된 시간 또는 약속된 횟수에 도달된 후에도 PDU가 수신되지 않는 경우, 그들간의 약속된 방법으로 SDU를 처리하도록 되어 있으므로, 각각의 상황에 따라 SDU를 적응적으로 처리할 수 없었다. 이로 인하여 송신단과 수신단 간의 원활한 통신이 이루어지지 않아 무선 자원이 낭비되는 결함이 있었다.As described above, in the conventional UMTS, when the PDU is not received even after the time or the promised number of times between the transmitting end and the receiving end is reached, the SDU is processed according to the promised method between them. It could not be handled adaptively. As a result, there is a defect in that radio resources are wasted because the communication between the transmitter and the receiver is not performed smoothly.

따라서, 본 발명의 목적은 RLC 레이어 상에서 송신단과 수신단 사이에 주고 받는 PDU의 순서를 계산하여 약속된 시점 또는 약속된 횟수에 도달된 후에도 그 PDU가 수신되지 않은 경우, 상황에 따라 SDU를 적응적으로 처리하는 유엠티에스의 에스디유 처리방법을 제공함에 있다.Accordingly, an object of the present invention is to calculate the order of PDUs transmitted and received between a transmitting end and a receiving end on an RLC layer to adaptively adapt an SDU according to a situation when the PDU is not received even after reaching a promised time or a promised number of times. The present invention provides a method for treating SDU of UTM.

도 1은 본 발명에 의한 유엠티에스의 에스디유 처리방법의 신호 흐름도.1 is a signal flow diagram of the SD processing method of the UTM according to the present invention.

***도면의 주요 부분에 대한 부호의 설명****** Description of the symbols for the main parts of the drawings ***

S1-S7 : 제1-7단계S1-S7: steps 1-7

본 발명에 의한 유엠티에스의 에스디유 처리방법은, SRB의 TM과 UM 모드에서 타이머를 기반으로 SDU를 폐기하고 명시된 시그널링을 수행하지 않는 방식을 사용하여, 송신과 수신단의 상호 확인 없이 SDU를 폐기하는 과정과; SRB의 응답모드(AM: Acknowleged Mode)에서 가능한 재전송 횟수(MAXDAT)만큼 PDU를 전송하고 SDU를 폐기하지 않는 과정과; RB(RB: Radio Bearer)가 트래픽 데이터를 전송하기 위한 모드이고 RLC 모드가 투명모드(TM: Transparent Mode) 또는 무응답모드(UM: Unacknowleged Mode)인 경우 타이머를 기반으로 SDU를 폐기하고 명시된 시그널링을 수행하지 않는 과정과; RB가 트래픽 데이터를 전송하기 위한 모드이고 RLC 모드가 AM모드인 경우 가능한 재전송 횟수만큼 MRW PDU를 전송한 후 SDU를 폐기하거나, 타이머를 기반으로 SDU를 폐기하고 명시된 시그널링을 수행하여 MRW PDU를 전송하는 과정으로 이루어지는 것으로, 이와 같은 본 발명의 에스디유 처리방법을 첨부한 도 1을 참조하여 상세히 설명하면 다음과 같다.In the method of processing SDU of UTM according to the present invention, the SDU is discarded based on a timer in the TM and UM modes of the SRB and does not perform the specified signaling, thereby discarding the SDU without mutual confirmation of the transmitting and receiving end. Process of doing; Transmitting a PDU as many times as possible retransmissions (MAXDAT) in an acknowleged mode (AM) of the SRB and not discarding the SDU; When the radio bearer (RB) is a mode for transmitting traffic data and the RLC mode is transparent mode (TM) or unacknowleged mode (UM), the SDU is discarded based on a timer and the specified signaling is performed. Do not process; When the RB is a mode for transmitting traffic data and the RLC mode is an AM mode, an MRW PDU is discarded after transmitting MRW PDUs as many times as possible retransmissions, or an MDU PDU is transmitted by discarding an SDU based on a timer and performing specified signaling. It is made of a process, described in detail with reference to Figure 1 attached to the SD oil treatment method of the present invention as follows.

본 발명에서는 RLC 레이어 상에서 송신단과 수신단 사이에 주고 받는 PDU의 순서를 계산하여 약속된 시점 또는 약속된 횟수에 도달된 후에도 그 PDU가 수신되지 않은 경우, 다음의 4가지 처리 방법 중 하나의 방법으로 처리하게 된다.In the present invention, if the PDU is not received even after the promised time or the promised number of times is calculated by calculating the order of PDUs transmitted and received between the transmitter and the receiver on the RLC layer, processing is performed by one of the following four processing methods. Done.

① 타이머를 기반으로 SDU를 폐기하고, 명시된 시그널링(signaling)을 수행함.① Discard the SDU based on the timer and perform the specified signaling.

② 타이머를 기반으로 SDU를 폐기하고, 명시된 시그널링을 수행하지 않음.② Discard the SDU based on the timer and do not perform the specified signaling.

③ 가능한 재전송 횟수(MAXDAT) 만큼 PDU를 전송한 후 SDU를 폐기함.③ Discard the SDU after transmitting the PDU as many times as possible (MAXDAT).

④ 가능한 재전송 횟수(MAXDAT) 만큼 PDU를 전송한 후 SDU를 폐기하지 않음.④ SDUs are not discarded after transmitting PDUs as much as possible retransmissions (MAXDAT).

참고로, 상기 타이머는 각각의 RLC SDU에 대한 RLC 계층에 머무른 시간을 측정하는 타이머이다.For reference, the timer is a timer for measuring the time spent in the RLC layer for each RLC SDU.

본 발명의 제1특징에 따르면, 시그널링 여부에 따라 상기 ②와 같이 명시된 시그널링(explicit signaling)을 수행하거나, 나머지 3가지의 명시된 시그널링(①,③,④)을 수행하는 것이다.According to the first aspect of the present invention, depending on whether the signaling is to perform the specified signaling (explicit signaling) as described above ②, or to perform the remaining three specified signaling (①, ③, ④).

본 발명의 제2특징에 따르면, 명시된 시그널링 방법은 상기 ①,③과 같이 MRW(MRW: Move Receiving Window) PDU를 전송하는 방법과, ④와 같이 리세트 PDU를 전송하는 방법으로 분류된다.According to the second aspect of the present invention, a specified signaling method is classified into a method of transmitting a MRW (MRW) PDU as in ① and ③ and a method of transmitting a reset PDU as in ④.

UMTS에서의 라디오 베어러(Radio Bearer)는 시그널링 데이터와 트래픽 데이터에 따라 SRB(SRB: Signaling Radio Bearer)와 RB로 분류된다.Radio bearers in UMTS are classified into SRBs and RBs according to signaling data and traffic data.

또한, QoS에 따라 4가지 즉, 대화식(conversational), 스트리밍(streaming), 양방향성(interactive), 배경 클래스(Background Class)로 분류되고, 서비스 영역에 따라 PS(PS: Packet Switched) 데이터, CS(CS: Circuit Switched) 데이터로 분류된다. 상기 대화식과 스트리밍 클래스는 CS 데이터로 전송되고, 양방향성과 배경 클래스는 PS 데이터로 전송된다.In addition, it is classified into four types according to QoS, namely, conversational, streaming, interactive, and background class, and according to service area, PS (PS) data, CS (CS) : Circuit Switched) data. The interactive and streaming classes are sent as CS data, and the bidirectional and background classes are sent as PS data.

상기 RB의 종류와 데이터의 종류에 따라 상기 4가지의 SDU 처리방법이 어떻게 선택되어 수행되는지에 대해 도 1을 참조하여 좀더 상세히 설명하면 다음과 같다.The method of selecting and performing the four SDU processing methods according to the type of RB and data is described in more detail with reference to FIG. 1 as follows.

RB가 SRB이고 RLC 모드가 TM 또는 모드인 경우 즉, SRB의 TM과 UM 모드에서는 상기 ②와 같이 "타이머를 기반으로 SDU를 폐기하고, 명시된 시그널링을 수행하지 않는 방식"을 이용하여 송신과 수신단의 상호 확인 없이 SDU를 폐기한다.(S1-S3)When the RB is SRB and the RLC mode is TM or mode, that is, in the TM and UM modes of the SRB, as shown in the above ②, "discard the SDU based on the timer and do not perform the specified signaling" as described in ②. Discard SDUs without mutual confirmation (S1-S3)

즉, RLC 계층으로 RLC SDU들이 내려오면, 각각의 RLC SDU에 대해 RLC계층에 머무른 시간을 측정하는 타이머의 카운트 동작이 시작되는데, 이 카운트값이 기 설정된 값이 카운트될 때 까지 해당 SDU가 성공적으로 전송되지 않았으면 SDU들을 폐기한다.That is, when the RLC SDUs come down to the RLC layer, a counting operation of a timer measuring the time staying in the RLC layer starts for each RLC SDU, and the SDU is successfully executed until the predetermined value is counted. If not sent, discard the SDUs.

그러나, 상기 RB가 SRB이고 RLC 모드가 AM 모드인 경우에는 SRB를 통한 시그널링 데이터는 한 비트라도 유실되면 안되므로 MRW PDU를 사용하면 안된다. 따라서, 데이터 유실이 있을 경우 데이터의 첫 비트부터 시작하는 방식인 리세트 PDU 전송방식을 사용한다. 그러므로, 상기 ④와 같이 "MAXDAT 수만큼 PDU를 전송한 후 SDU를 폐기하지 않는 방식"을 사용한다.(S4)However, when the RB is the SRB and the RLC mode is the AM mode, signaling data through the SRB should not be lost even one bit, so the MRW PDU should not be used. Therefore, if there is data loss, the reset PDU transmission method, which starts from the first bit of data, is used. Therefore, a method of not discarding the SDU after transmitting PDUs by the number of MAXDATs is used as in ④.

상기 제1단계(S1)에서의 확인 결과 RB가 트래픽 데이터를 전송하기 위한 TRB이고 RLC 모드가 TM 또는 UM모드인 경우 즉, CS 데이터 전송시에는 RLC TM을 사용하므로 상기 ②와 같이 "타이머를 기반으로 SDU를 폐기하고, 명시된 시그널링을 수행하지 않는 방식"을 이용하여 송신과 수신단의 상호 확인을 할 필요가 없다.(S5,S6)As a result of the checking in the first step S1, when the RB is a TRB for transmitting traffic data and the RLC mode is TM or UM mode, that is, RLC TM is used for CS data transmission, Discards the SDU and does not perform the mutual confirmation of the transmitting and receiving end using a "method of not performing the specified signaling." (S5, S6)

그런데, 상기 제1단계(S1)에서의 확인 결과 RB가 트래픽 데이터를 전송하기 위한 TRB이고 제5단계(S5)에서의 확인 결과 RLC 모드가 AM모드인 경우 즉, PS 데이터 전송시에는 상기 ③과 같이 "MAXDAT 수만큼 PDU를 전송한 후 SDU를 폐기"하거나, ①과 같이 "타이머를 기반으로 SDU를 폐기하고 명시된 시그널링을 수행"하여 MRW PDU를 전송한다.(S7)However, when the check result RB in the first step (S1) is a TRB for transmitting traffic data and the check result RLC mode in the fifth step (S5) is AM mode, that is, when the PS data transmission, As described above, "SDUs are discarded after PDUs are transmitted as many as MAXDAT" or MRW PDUs are transmitted by "discarding SDUs based on a timer and performing specified signaling" as in ①. (S7)

이상에서 상세히 설명한 바와 같이 본 발명은 여러가지의 SDU 폐기 방법 중에서 RB의 종류와 데이터의 종류에 따라 적당한 폐기방법이 선택하도록 함으로써, 송신단과 수신단 간의 원활한 통신이 보장되는 효과가 있다.As described in detail above, the present invention allows an appropriate discard method to be selected according to the type of RB and the type of data among various SDU discard methods, thereby ensuring smooth communication between the transmitter and the receiver.

Claims (1)

SRB의 TM과 UM 모드에서 타이머를 기반으로 SDU를 폐기하고 명시된 시그널링을 수행하지 않는 과정과; SRB의 AM 모드에서 가능한 재전송 횟수만큼 PDU를 전송하고 SDU를 폐기하지 않는 과정과; RB가 트래픽 데이터를 전송하기 위한 모드이고 RLC 모드가 TM 또는 UM모드인 경우 타이머를 기반으로 SDU를 폐기하고 명시된 시그널링을 수행하지 않는 과정과; RB가 트래픽 데이터를 전송하기 위한 모드이고 RLC 모드가 AM모드인 경우 가능한 재전송 횟수만큼 PDU를 전송한 후 SDU를 폐기하거나, 타이머를 기반으로 SDU를 폐기하고 명시된 시그널링을 수행하는 과정으로 이루어지는 것을 특징으로 하는 유엠티에스의 에스디유 처리방법.Discarding the SDU based on the timer in the TM and UM modes of the SRB and not performing the specified signaling; Transmitting the PDU as many times as possible retransmissions in the AM mode of the SRB and not discarding the SDU; When the RB is a mode for transmitting traffic data and the RLC mode is a TM or UM mode, discarding the SDU based on a timer and not performing the specified signaling; When the RB is a mode for transmitting traffic data and the RLC mode is an AM mode, a process of discarding the SDU after transmitting the PDU as many times as possible retransmissions or discarding the SDU based on a timer and performing specified signaling SD method of treating UTM.
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CN107333298A (en) * 2016-04-29 2017-11-07 电信科学技术研究院 A kind of data transmission method and relevant device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107333298A (en) * 2016-04-29 2017-11-07 电信科学技术研究院 A kind of data transmission method and relevant device
CN107333298B (en) * 2016-04-29 2020-03-24 电信科学技术研究院 Data transmission method and related equipment

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