Abstract:
본 발명은 다중-링크 서브넷 모델로 인한 문제를 해결한 수정된 MANET 구조에 따른 connected MANET에서 MANET 내의 소스 호스트가 MANET 내의 다른 호스트나 외부 인터넷 망의 호스트와 IP 패킷을 주고받을 수 있도록 해주는 경로 결정 방법을 제공한다. 이를 위해 소스 호스트와 목적지 호스트의 IP 주소를 MANET 프리픽스로 서브넷 마스킹해서 목적지 호스트가 소스 호스트와 동일 MANET에 존재하는지 또는 외부 인터넷 망에 존재하는지를 결정한다. 만일 목적지 호스트가 동일 MANET에 존재하면, 소스 호스트가 연결된 MANET 라우터가 RREQ 메시지를 보내고 목적지 호스트가 연결된 MANET 라우터가 이 RREQ 메시지를 수신하면 RREP 메시지를 보냄으로써 소스 호스트와 MANET 내 목적지 호스트 간 경로 결정을 할 수 있게 한다. 만일 목적지 호스트가 외부 인터넷 망에 존재하면, 소스 호스트가 연결된 MANET 라우터가 IP 패킷을 캡슐화해서 MBR에게 보내면 MBR이 캡슐화된 IP 패킷을 역캡슐화해서 외부 인터넷 망에 있는 목적지 호스트에게 전달한다. MANET, 수정된 MANET 구조, 다중-링크 서브넷
Abstract:
M(>1)개의 송신안테나를 구비한 제1 기기 및 N(>1)개의 수신안테나를 구비한 제2 기기를 포함하는 다중 안테나 시스템을 위한 송신 방법이 개시(disclose)된다. 이 방법은 상기 제1 기기와 상기 제2 기기에서 사용 가능한 적어도 하나의 다중 입력 다중 출력(Multiple Input Multiple Output : 이하, MIMO) 전송 기법 - 활성화된 송신안테나수, 수신안테나수, 및 MIMO 코드로 결정됨 - 중에서, 주어진 송신 전력으로 프레임을 송신하는 데에 단일 입력 단일 출력(Single Input Single Output : 이하, SISO) 전송 기법보다 작은 에너지를 소모하는 조건을 충족하는 MIMO 전송 기법이 존재하는지를 판단하는 단계; 상기 조건을 충족하는 적어도 하나의 MIMO 전송 기법이 있으면, 전송 모드를 MIMO 모드로 결정하고, 그렇지 않으면 상기 전송 모드를 SISO 모드로 결정하는 단계; 및 상기 결정된 전송 모드에 따라 상기 제1 기기로부터 상기 제2 기기로의 프레임 송신을 수행하는 단계를 포함한다. 따라서, 전력 절감적인 프레임 송신이 수행될 수 있다.
Abstract:
PURPOSE: A method of individual session handoff considering quality of a service in a multi-hop radio access network is provided to perform the handoff to different gateway router for each session by applying different weight value according to the service quality request for each session. CONSTITUTION: The metric information of a gateway router is collected, and a gateway router table of the gateway is configured by using the metric router table. A separate session handoff to a gateway router having minimum cost is performed by using the gateway router table value and weight value(S301-S303). The weight value is differently defined for each session in the weight value table.
Abstract:
PURPOSE: A route determination method for the modified MANET architecture that overcomes the problems of a multi-link subnet model is provided to enable a host within a MANET to exchange an IP packet with an external Internet network or another host within the MANET. CONSTITUTION: A MANET(Mobile Ad-hoc Network) router determines whether or not a source host and a destination host belong to the same MANET. In addition, the MANET determines whether or not the source host and the destination host are placed in the external Internet, and finds out the path to the destination host. The MANET router connected to the host transfers the path information to the source host.
Abstract:
PURPOSE: A method for executing a handoff in a wireless ad hoc network is provided to perform an adaptive handoff between a mobile ad hoc network and an Internet network. CONSTITUTION: A current traffic load is compared with a previous traffic load(S304). If the previous traffic load is larger than the current traffic load, the difference between previous traffic load the current traffic load is compared with a second setup value(S314,S316). If the difference between the previous traffic load and the current traffic load is larger than the second setup value, a hop number weight value of cost function is increased(S318). The surplus bandwidth weight value is reduced.
Abstract:
A simply multi-channel migration scheme for multi-hop IEEE(Institute of Electrical and Electronics Engineers) 802.11 networks is provided to omit a specific process for channel assignment, thereby improving throughput and reducing delay of nodes. In a multi-channel scheme using plural channels not a single channel in multi-channel multi-hop IEEE(Institute of Electrical and Electronics Engineers) 802.11 networks, the multi-channel scheme is performed by the following steps of: recognizing transmission of another node and performing movement to another channel; and returning to one basic channel after the transmission by using a specific timer.
Abstract:
An area-based overlay multicast method using geographical information in a mobile ad hoc network is provided to be capable of dividing network topology into areas by using geographical information of group member nodes, while limiting a location updating range to related areas only, thereby reducing packet overheads related to location information maintenance. Topology of a mobile ad hoc network is divided into areas(106). Non-group member nodes(104) demand multicast session subscription to a GC(Group Coordinator)(100) to become group member nodes. Group member nodes(102) demand multicast session secession to the GC(100) to become non-group member nodes. The group member nodes(102) periodically notify another group member nodes within a self area of location information on the group member nodes(102). When the group member nodes(102) move between the areas(106), the group member nodes(102) notify the GC(100) and another group member nodes within a new area and a previous area of location information on the group member nodes(102). The GC(100) receiving data packets from a data packet transmitter distributes the data packets to the group member nodes(102) within the mobile ad hoc network.
Abstract:
A hop-by-hop frame aggregation method of a VoIP(Voice over Internet Protocol) in a multi-hop wireless network environment is provided to aggregate all frames transmitted to multiple hops without an additional burden through frame aggregation and pseudo-broadcast technologies in the network environment, thereby increasing a frame aggregation ratio as remarkably expanding the number of VoIP calls. If frames transmitted to multiple hops enter a queue for preparing transmission, the frames are aggregated so that the aggregated frames are transmitted, regardless of destination hops of each frame. Each receiver receives the aggregated frames through a promiscuous mode even though the receivers are not the destination hops, and processes the frames essential for the receivers, then sends ACK(Acknowledgement) signals to terminals which send the aggregated frames.
Abstract translation:提供了一种多跳无线网络环境中VoIP(Voice over Internet Protocol,语音互联网协议)的逐跳帧聚合方法,通过帧聚合和伪广播技术,将发送到多跳的所有帧聚合,无需附加负担。 网络环境,从而增加了帧聚合比,显着扩大了VoIP呼叫的数量。 如果发送到多跳的帧进入准备传输的队列,则聚合帧,使得聚合帧被发送,而不管每帧的目的地跳数。 每个接收机通过混杂模式接收聚合帧,即使接收机不是目的地跳,并处理接收机必不可少的帧,然后向发送聚合帧的终端发送ACK(确认)信号。