KR970056305A

KR970056305A - How to handle UA frame in LAPD of ISDN user-network access

Info

Publication number: KR970056305A
Application number: KR1019950052759A
Authority: KR
Inventors: 정용길; 이종대
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1995-12-20
Filing date: 1995-12-20
Publication date: 1997-07-31

Abstract

본 발명은 ISDN 사용자-망 접속의 LAPD에서 UA 프레임 처리방법에 관한 것으로, 계층 1로부터 UA 프레임을 수신하는 단계(201); 상기 수신된 프리미티브의 링크 엔티티를 식별하여 해당 링크 엔티티의 현재 상태를 판별하고 어드레스 필드와 콘트롤 필드를 분석하는 단계(202,203); 상태 판별결과 상태 5이고 P비트가 1이며 계층 3에서 설정을 요구한 경우 DL_ESTABLISH_CFM을 상위계층으로 전송하고, 계층 2에서 내부적으로 재설정된 경우 전송이 완료되지 않았으면 I-큐 의 데이타를 제거하고 DL_ESTABLISH_IND 프리미티브로 상위계층에 이를 알려주며, 이어서 T200 타이머를 정지하고, T203 타이머를 스타트하며 V(S), V(A), V(R)을 초기화하고 다중 프레임 설정상태로 천이하는 단계(225~232); 상태 판별결과 상태 5이고 P비트가 1이 아니면 에러타입을 표시하고 MDL_ERROR_IND 프리미티브로 관리계층에 이를 알려준 후 설정 대기상태로 천이하는 단계(222,223,224); 상태 판별결과 상태 6이고 P비트가 1이면 DL_RELEASE_CFM 프리미티브를 상위계층으로 전송하고, T200타이머를 정지한 후 TEI 할당상태로 천이하는 단계(242,243,244); 및 상태 판별결과 상태 6이고 P비트가 1이 아니면 에러타입을 표시하고 MDL_ERROR_IND 프리미티브로 관리계층에 이를 알려주는 단계(245,246)로 구성되어 처리절차를 단순화하여 처리시간을 단축할 수 있는 효과가 있다.The present invention relates to a method for processing a UA frame in LAPD of an ISDN user-network connection, comprising: receiving a UA frame from layer 1 (201); Identifying (202,203) the link entity of the received primitive to determine the current state of the link entity and to analyze an address field and a control field; As a result of status determination, if status 5, P bit is 1, and setting is requested by layer 3, DL_ESTABLISH_CFM is sent to higher layer.If it is reset internally in layer 2, if the transmission is not completed, the data of I-queue is removed and DL_ESTABLISH_IND The primitive notifies the upper layer, then stops the T200 timer, starts the T203 timer, initializes V (S), V (A), and V (R) and transitions to the multi-frame setting state (225-232). ; If the state discrimination state is 5 and the P bit is not 1, an error type is indicated, the MDL_ERROR_IND primitive is notified to the management layer, and the state transitions to the setting standby state (222, 223, 224); If the state determination result indicates that the state is 6 and the P bit is 1, transmitting the DL_RELEASE_CFM primitive to an upper layer, stopping the T200 timer, and then transitioning to the TEI allocation state (242, 243, 244); And state 6 as a result of the state discrimination, and if the P bit is not 1, steps (245 and 246) indicating an error type and informing the management layer by the MDL_ERROR_IND primitive have the effect of shortening the processing time.

Description

How to handle UA frame in LAPD of ISDN user-network access

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제6도는 본 발명에 따라 LAPD를 구현하는 하드웨어의 예를 도시한 도면.6 illustrates an example of hardware for implementing LAPD in accordance with the present invention.

제8도는 본 발명에 적용되는 계층2에서의 환경변수 테이블을 도시한 도면.8 is a diagram showing an environment variable table in Layer 2 applied to the present invention.

제10도는 본 발명에 따른 프리미티브 처리절차를 도시한 SDL 도면이다.10 is an SDL diagram illustrating a primitive processing procedure according to the present invention.

Claims

In the LAPD implementation method in which an ISDN terminal receives a PH_DATA_IND primitive from layer 1 and analyzes an address field and a control field according to a command / response type to access an ISDN terminal in a network according to a layered protocol. Receiving (201) a UA frame from Layer 1; Identifying (202,203) the link entity of the received primitive to determine the current state of the link entity and to analyze an address field and a control field; As a result of status determination, if status 5, P bit is 1, and setting is requested by layer 3, DL_ESTABLISH_CFM is sent to higher layer.If it is reset internally in layer 2, if the transmission is not completed, the data of I-queue is removed and DL_ESTABLISH_IND The primitive notifies the upper layer, then stops the T200 timer, starts the T203 timer, initializes V (S), V (A), and V (R) and transitions to the multi-frame setting state (225-232). ; If the state discrimination state is 5 and the P bit is not 1, an error type is indicated, the MDL_ERROR_IND primitive is notified to the management layer, and the state transitions to the setting standby state (222, 223, 224); If the state determination result indicates that the state is 6 and the P bit is 1, transmitting the DL_RELEASE_CFM primitive to an upper layer, stopping the T200 timer, and then transitioning to the TEI allocation state (242, 243, 244); And (245, 246) indicating an error type and informing the management layer of the MDL_ERROR_IND primitive if the state discrimination state is 6 and the P bit is not 1 (245, 246).

※ Note: The disclosure is based on the initial application.