Abstract:
A method and an apparatus for encoding and decoding color video scalability are provided to prevent unnecessary data amount from increasing when storing or transmitting encoded information, improve encoding efficiency by not doubly encoding the same information as already encoded information, prevent the same information as already decoded information from being doubly decoded and improve decoding efficiency. A color video scalability encoding method includes encoding a color image block of an improvement stratum by using lower stratum information. The encoding generates a color sign block pattern value according to quantization coefficient values of a residual color image block by using the lower stratum information. A color video scalability decoding method includes determining presence/absence of an improvement stratum having a different color format from that of a lower stratum in a received bit stream, and decoding a color image block of the improvement stratum by using the lower stratum information.
Abstract:
A link module of an ONT/ONU with an optical wavelength aligning function in WDM-PON, a link system, and a method of aligning optical wavelength are provided to perform communication by initializing the optical wavelength of the link module automatically without intervention of a user or an installer. An initial information creation unit(111) creates link initiation information which is logical information of a predetermined format for checking a transmission state. A wavelength control unit(113) assigns output wavelengths to be outputted from a wavelength group sequentially. An optical transmission unit(115) transmits an assigned optical signal including the link initiation information to the assigned wavelength, whenever assigning the output wavelength from the wavelength control unit. A wavelength selection unit(119) stops the sequential assignment to the wavelength control unit if a response optical signal including response initiation information is received.
Abstract:
A dynamic bandwidth allocation apparatus and a method thereof for transmission efficiency extension in a WDM/TDM-PON(Wavelength Division Multiplexed/Time Division Multiplexed-Passive Optical Network) network are provided to maintain basic bandwidth allocation equity in a sub group layer during uplink data transmission and process variable traffic load efficiently by an HF-DBA(Hierarchical Fair-Dynamic Bandwidth Allocation) algorithm, thereby maintaining high network transmission efficiency and the service efficiency of the sub group. A sub group service weight table stores each of service weight information about M sub groups comprised of N ONUs(Optical Network Units). An ONU service weight table(20) stores each of service weight information about the N ONUs belonging to each sub group. A DBA(Dynamic Bandwidth Allocation) agent allocates bandwidth to each sub group and each ONU within the sub groups on the basis of the service weight information stored in the sub group service weight table and the ONU service weight table. A sub group time window table(26) stores the bandwidth allocated to the sub groups. An ONU time slot table(25) stores the allocated bandwidth to each ONU. A variable laser diode outputs different M wavelengths of optical signals with the bandwidth allocated to each sub group. A reception unit receives an uplink optical signal transmitted from each ONU during a time slot section corresponding to the bandwidth allocated to each ONU.
Abstract:
An extendable loop-back type PON(Passive Optical Network) and a scheduler and scheduling method for the PON are provided to reduce a maintenance cost and an upgrading cost of a network by integrating advantages of TDM and WDM techniques. An OLT(Optical Line Terminal)(200) includes wavelength-variable optical transmitters(210) and wavelength-fixed optical transmitters(220). An RN(Remote Node)(250) includes optical combining/distributing units(270) that receive an optical signal transmitted from the wavelength-variable optical transmitters(210), distribute the received optical signal according to each wavelength, and transmit it to ONTs(Optical Network Terminals)(290). The ONTs(290) transmit uplink data to the OLT(200) by using the same wavelength as that of the optical signal received from the OLT(200).
Abstract:
본 발명은 파장 분할 다중화 기반의 수동형 광가입자망(WDM-PON)의 광송수신장치의 광특성 감시, 제어 시스템 및 방법에 관한 것으로서, 광선로종단장치(OLT) 및 다수의 광가입자단말장치(ONU) 내에 구비되는 각 광송수신장치의 광파워 및 광파장의 변화를 감시하고, 상기 광파워 및 광파장에 대한 감시정보를 SNMP 트랩 서비스를 통해 외부 단말에 탑재된 감시제어유닛으로 전달하고, 상기 감시제어유닛이 상기 감시정보에 따른 광파워 및 광파장에 대한 제어정보를 상기 SNMP를 통해 상기 OLT 및 각 ONU로 전송하여, 상기 광파워 및 광파장을 제어하도록 한다. WDM-PON, 광송수신장치, SNMP, OLT, ONU, 감시, 광특성
Abstract:
PURPOSE: An IMT-2000 mobility function test apparatus and an operation method of the same are provided to verify a GSM Phase 2+ based mobility function of an ATM mobile switch without additionally constructing a physical apparatus like a mobile terminal and a base station and adapt a No.7 signal system which is a standardized and commercial command line signal method. CONSTITUTION: An IMT-2000 test apparatus(1) uses a TCP/IP and is connected with a LAN(Local Area Network)(4) and is used in any place in which a test apparatus is accessed using a personal computer. The IMT-2000 test apparatus(1) includes an ATM adaptation card and is connected with an ATM mobile switch(3) using an optical cable(2) and includes an NNI-M(Network-Network Interface with Mobility) of a wide band ISDN having a mobility. An IMT-2000 bearer process block(114) transmits and receives a mobility function related message with an IMT-2000 mobile call process(112) which processes a mobile terminal function in a test apparatus, namely, a transmission and receiving operation of a mobile call when performing a mobility function test and an IMT-2000 mobility management process(113) which processes a mobility management, and manages a base station operation, namely, a communication way.
Abstract:
1. 청구범위에 기재된 발명이 속한 기술 분야 본 발명은 신호 프로토콜 처리 방법 및 그 장치에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은 별도의 다른 망 구성 요소 없이도 차세대 이동 통신 교환기의 이동성 검증이 가능한 차세대 이동 통신 교환기의 이동성을 검증하기 위한 신호 프로토콜 처리방법 및 그 장치를 제공하고자 함. 3. 발명의 해결방법의 요지 본 발명에 따른 방법은 사용자가 적어도 위치 등록, 위치 갱신, 디테치, 통신 요구를 포함하는 이동성을 요구하고, 이를 처리 가능한 메시지로 변환하는 단계와, 상기 변환된 메시지를 적어도 단말기 엑세스, 이동성 관리, 이동호 처리, 고정 가입자 호처리, 베어러 제어를 포함하는 세부 이동성별로 분류 처리하는 단계와, 상기 세부 이동성별로 분류 처리된 결과를 차세대 이동 통신 교환기로 전송하는 단계, 및 사용자가 상기 이동성을 요구한 후, 각 처리 단계별 처리 상태와 그 결과를 알 수 있도록 화면상에 표시하는 단계를 포함함. 4. 발명의 중요한 용도 본 발명은 차세대 이동 통신 교환기의 이동성을 검증하는데 이용됨.
Abstract:
PURPOSE: An apparatus and a method for processing a signal protocol to verify a mobility of an international mobile telecommunication (IMT) exchange are provided to verify the mobility of the exchange without an additional network element, and utilize the exchange for an asynchronous transfer mode (ATM), by developing the mobilities of a mobile terminal and a base station with integration. CONSTITUTION: If a message for a mobility and terminal access controls is received (111), it is determined to be valid (112). If the message is not valid, an error process is performed (113), and otherwise a transaction identifier and terminal managing message are generated (114) prior to transmission to an ATM mobile exchange (121). If a valid call process message is received (115,116,113), a call reference number is generated and converted to a Q.2931 message (117). The Q.2931 message is transmitted to the exchange (121). If a bearer message is received (118), the validity check process and error process are performed (119,113). The bearer message is converted to a mobility added message (120) prior to the transmission (121). If a control message is received (122), and it is determined to be valid and a type of the control message is classified (123).