Abstract:
PURPOSE: A packet scheduling method for supporting an IP-QoS(Internet Protocol Quality of Service) in a wireless communication network is provided to perform real-time traffic control with different requirements for delay times in each core router inside an UMTS/GPRS(Universal Mobile Telecommunication System/General Packet Radio System) network, and to meet an UMTS/GPRS QoS standard requesting the provision of QoS differentiated between traffic classes. CONSTITUTION: If a core router receives a traffic packet(601), a traffic class is discriminated according to DSCP(Differentiated Service Code Point)(602). If the packet is included in a conversational class, whether the packet is acceptable in an EF(Expedited Forwarding) queue is checked(603). If not, the packet is discarded(608), and if acceptable, the packet is stored in the EF queue(607). If the packet is included in a streaming class in the step 602, whether the packet is acceptable in the EF queue is checked(604). If not, the packet is discarded(608), and if acceptable, the packet is accepted to the last position of stand-by packets in the EF queue(609). If the packet is included in an interactive class in the step 602, whether the packet is acceptable in an AF(Assured Forwarding) queue is checked(605). If not, the packet is discarded(611), and if acceptable, the packet is accepted to the last position of stand-by packets in the AF queue(610). If the packet is included in a background class in the step 602, whether the packet is acceptable in an BE(Best Effort) queue is checked(605). If not, the packet is discarded(611), and if acceptable, the packet is accepted to the last position of stand-by packets in the BE queue(612). And the stand-by traffic packet is transmitted(613).
Abstract:
PURPOSE: A method for controlling a dynamic combined use timer based call connection in an ATM(asynchronous transfer mode) adaptive layer 2 is provided to minimize a consumption of a bandwidth by dynamically controlling a Time_CU value to reduce the time out number and use a remained bandwidth in a traffic for an available bit rate/unspecified bit rat service. CONSTITUTION: When a call is requested(S501), a cell assembly delay time is tested(S503). A Time_CU is increased(S505) and the cell assembly delay time is again tested(S507). The Time_CU is reduced to a previous value(S509) and a call request is received(S511). The Time_CU is compared with a MAX_TCU(S513). When the Time_CU is greater than the MAX_TCU, the call request is received(S511). When the Time_CU is less than the MAX_TCU, steps S505 to S513 are sequentially performed. The Time_CU is reduced(S515) and the cell assembly delay time is again tested(S517). The Time_CU is compared with a MIN_TCU(S519). When the Time_CU is greater than the MIN_TCU, the call request is rejected(S521). When the Time_CU is less than the MIN_TCU, steps S515 to S519 are sequentially performed.
Abstract:
PURPOSE: A control method for connecting a call is provided to adjust the generating rate of a soft handoff and the generating rate of a hard handoff, and give a priority for a handoff call in a mobile communication system with a CDMA(Code Division Multiple Access) method. CONSTITUTION: A control method for connecting a call in a mobile communication system with a CDMA(Code Division Multiple Access) method comprises the steps of: allocating a channel or cutting a call according to whether an idle channel exists, after selecting a minimal occupation frequency band, according to a new call connection request, placing a suspending que for a handoff every frequency band; performing a soft handoff when it is not a request for a maximum occupation frequency band, according to a request for a handoff call connection; checking whether the que is used as to whether the idle channel exists, when it is a request for a maximum frequency band, and performing a hard handoff; comparing the size between the difference for call servicing number in the maximum/minimum occupation frequency band, including handoff calls, and the difference for the critical value of the hard handoff, and performing the soft handoff or the hard handoff according to the result.
Abstract:
PURPOSE: An image display device and a method thereof are provided to display a 3D image by a multilayered barrier method. CONSTITUTION: A measuring unit(850) measures the distance between a viewer who watches a 3D image and a screen, right/left locations, and the face slope of the viewer. A barrier controller(860) selects and controls a parallax barrier using a signal measured by the measuring unit. A barrier switch(870) switches a parallax barrier by control of the barrier controller. A multi-layer parallax barrier(820) is turned on/off by switching of the barrier switch to transmit/block light. An LCD panel(810) displays a 3D image by the light.
Abstract:
1. 청구범위에 기재된 발명이 속하는 기술분야 본 발명은 무선통신망에서의 연결 수락 제어방법에 관한 것임. 2. 발명이 해결하고자 하는 기술적 과제 본 발명은, 망에 유입되는 트래픽의 양을 적절히 조절함으로써 기존의 호에 대한 QoS를 핸드오프와는 무관하게 지속적으로 지원함과 동시에 망 자원 이용도를 최대화하고, 예약 파라미터의 동적인 변경을 통해 네트워크 상황의 변화에 대해 적응적으로 대처할 수 있도록 한 무선 통신망에서의 연결 수락 제어방법 및 상기 방법을 실현시키기 위한 프로그램을 기록한 컴퓨터로 읽을 수 있는 기록매체를 제공하는데 그 목적이 있음. 3. 발명의 해결방법의 요지 본 발명은, 무선통신망에 적용되는 연결 수락 제어방법에 있어서, 호 연결요구에 따라 망에 유입되는 호의 종류를 판단하는 제 1 단계; 상기 제 1 단계의 판단결과, 신규호의 연결 요청인 경우에는 이동이 예상되는 인접 셀을 시간선택적 대역 예약 방식을 이용하여 예약하고, 연결 수락을 결정하는 제 2 단계; 상기 제 1 단계의 판단결과, 핸드오프 호의 연결 요청인 경우에 연결 요구가 발생한 셀에서 연결 수락을 결정하는 제 3 단계; 및 상기 연락 수락이 결정되면, 예약슬롯 크기, 예약범위 및 예약 대역폭등의 예약 파라미터를 망의 트래픽 상태에 따라 적응적으로 제어하는 제 4 단계를 포함한다. 4. 발명의 중요한 용도 본 발명은 무선통신 등에 이용됨.
Abstract:
PURPOSE: A method for controlling a connection acceptance in a wireless communication network is provided to support a QoS(Quality of Service) with respect to a conventional call continuously regardless of hand off and use a network resource sufficiently by adjusting an amount of a traffic being flown in a network and cope with a variation of a network status in adaptable through a dynamic conversion of a reservation parameter. CONSTITUTION: A call being flown to a network by receiving a call connection request is classified into new call and a hand off call(601). If a receipt-confirmed call by the call connection request is confirmed as a hand off call, it is checked whether the call is a mobile-QoS call(602). If the received call is a mobile-QoS call, a connection is permitted(606) in a cell having a generated connection request with respect to the hand off call only when a request bandwidth(BW_req(0)) of a terminal is less than the sum of an idle bandwidth(BW_avl(0)) and an occupied bandwidth(BW_res(0))(604). If the received call is not a mobile-QoS call, a connection is permitted(606) in a cell having a generated connection request with respect to the hand off call only when a request bandwidth(BW_req(0)) of a terminal is less than an idle bandwidth(BW_avl(0))(603). If a connection permission control procedure is terminated, a call history management with respect to the control result is performed(612), and an adaptive control function is performed by a reservation parameter(613).
Abstract:
다수의 피코넷이 존재하는 고속 WPAN 환경에서 최적 경로를 설정하기 위한 라우팅 방법은 최적 경로를 제공하는 토폴로지 서버를 필요로 하며 모든 PNC(Piconet Controller)는 토폴로지 서버 역할을 할 수 있다. 최적 경로를 제공하기 위해 토폴로지 서버 기능을 수행하는 PNC는 자신이 루트(root) 역할을 하는 부트리(sub-tree)에 속하는 모든 PNC/DEV들로부터 링크??상태 정보를 수집하고, 수집된 링크-상태 정보를 기반으로 최소 비용 알고리즘을 적용하여 부트리 내에 있는 모든 출발지-목적지 쌍에 대한 최적 경로를 QoS를 고려하여 계산한다. 최적 경로 정보는 목적지 PNC/DEV를 거쳐 출발지 PNC로 전달하며 이 과정에서 출발지-목적지 쌍간의 최적 경로가 설정된다. 고속 WPAN, 피코넷, 최적경로, 멀티 홉, 라우팅
Abstract:
본 발명은 CDMA 방식의 이동통신 시스템에서의 호 연결 제어 방법에 관한 것이다. 본 발명에서는 각 주파수 대역마다 핸드오프를 위한 대기 큐를 두고, 신규 호 연결 요구에 따라 최저 점유 주파수 대역을 선택한 후 유휴 채널의 존재 여부에 따라 채널을 할당하거나 호를 절단한다. 또한, 핸드오프 호 연결 요구에 따라 최대 점유 주파수 대역에 대한 요구가 아닐 경우 소프트 핸드오프를 실행하고, 최대 주파수 대역에 대한 요구일 경우 유휴 채널의 존재 여부에 따라 대기 큐 사용 여부를 검사하거나 하드 핸드오프를 실행하며, 대기 큐를 사용할 경우 대기 큐에 대기중인 핸드오프 호를 포함한 최대 점유 및 최소 점유 주파수 대역에서 서비스중인 호의 수에 대한 차이와 하드 핸드오프 임계치와의 크기를 비교하여 그 결과에 따라 소프트 핸드오프 또는 하드 핸드오프를 실행한다. 본 발명에 의하면 각 주파수 대역간의 트래픽 점유를 균형적으로 할당할 수 있고, 소프트 핸드오프와 하드 핸드오프의 발생율을 인위적으로 조절할 수 있으며, 진행중인 핸드오프 호에 대한 절단율을 줄일 수 있다.
Abstract:
PURPOSE: A method for managing a transmission and reception queue is provided to reduce a queue space by using only two queues. CONSTITUTION: A method for managing a transmission and reception queue comprises the following steps. A message is transmitted to a network line according to information of a transmission queue element A. The owner information of the transmission queue element A is changed to nobody(3) by a control program of a network interface(2). The owner information of the transmission queue element B behind the transmission queue element A is changed to a host as much the number of reception buffer in a host memory of an opposite process.
Abstract:
PURPOSE: A routing table generating method for multi-hop service in a high speed wireless personal area network is provided to implement multi hope communication on pico network by performing routing based on optimum path. CONSTITUTION: A controller of a parent piconet(100) transmits the link state request message by each controller of a plurality of child piconet. The controller of the parent piconet receives a message a plurality of link active registration messages from each controller of a plurality of child piconets. The controller of the parent piconet generates the link budget table. The controller of the parent piconet applies the least cost algorithm to the link budget table. The controller of the parent piconet generates the routing table.