Abstract:
The performance and ease of management of wireless communications environments is improved by a mechanism that enables access points (APs) to perform automatic channel selection. A wireless network can therefore include multiple APs, each of which will automatically choose a channel such that channel usage is optimized. Furthermore, APs can perform automatic power adjustment so that multiple AN can operate on the same channel while minimizing interference with each other. Wireless stations are load balanced across APs so that user bandwidth is optimized. A movement detection scheme provides seamless roaming of stations between APs.
Abstract:
The performance and ease of management of wireless communications environments is improved by a mechanism that enables access points (APs) to perform automatic channel selection. A wireless network can therefore include multiple APs, each of which will automatically choose a channel such that channel usage is optimized. Furthermore, APs can perform automatic power adjustment so that multiple APs can operate on the same channel while minimizing interference with each other. Wireless stations are load balanced across APs so that user bandwidth is optimized. A movement detection scheme provides seamless roaming of stations between APs.
Abstract:
In a VoIP system adopting the AMR method, an efficient mobile communication system of high quality is provided by classifying packets by heterogeneous error protection in encoding data by the AMR method and by transmitting through a transport channel 26 of a required quality corresponding to the class of the packets.
Abstract:
In order to transmit a data message in a multi-hop environment, a first station broadcasts or multicasts a transmission to other stations or receivers nearby. After one or more of the stations replies to the first station, the first station selects one of the stations that replied and transmits a command message to the selected station to assume responsibility for forwarding the data message. The data message can accompany the first transmission from the first station, or can accompany the command message. In addition, the replies to the first station can include information regarding costs of routing the data message to its destination. In another variation, the first transmission can include both the data message and a command message designating one of the nearby stations, so that when the designated station receives the first transmission it can immediately forward the data message and then later reply to the first station. This variation also includes a backup mechanism so that if the designated station does not receive the first transmission can replay to the first station, which can then evaluate the replies, select one of the stations that replied, and transmit a command message to the selected station.
Abstract:
An amorphous communication network having no traditional wireless backbone has plural roving or migratory access node (200) or terminal devices that are carried or transported along with individuals. Each wireless node (200) has a user interface and a local ID, e.g., an IP address, URL, telephone number. Voice, data, or video is transferred to other migratory nodes (104) or to a conventional land-based telephone or data terminal via a PSTN, Internet, ATM network, etc. A geolocation detector in the node (200), such as a GPS, keeps track of the instantaneous position, which is conveyed to a locally or remotely stored database (400). A local processor (250) accesses this database (400) to determine node-to-node paths to a destination when the node (200) operates as a source. A node (200) captures a transmitted message when the destination address in the message matches its local address, or otherwise forwards the message towards a destination if the address does not match. Acknowledgements are sent between nodes (104) upon successful receipt of information. The node's wireless transceiver (260) also adapts to the environment and terrain to control transmission and reception characteristics according to bandwidth, inter-node spacing, signal strength, bit error rate, node population density, frequency spectrum, data rate and/or air interface protocol. Nodes (200) may periodically or randomly unicast or broadcast its ID and/or position data to update a database (400), which then may be propagated to other databases throughout the network. A database (400) may reside locally within a node (200) or at fixed regional locations (106) that are linked together to form a global database.
Abstract:
An apparatus and a method for routing data in a radio data communication system having one or more host computers (10), one or more intermediate base statios (20-52), and one or more RF terminals (100) organizes the intermediate base stations into an optimal spanning-tree network to control the routing of data to and from the RF terminals and the host computer efficiently and dynamically. Communication between the host computer and the RF terminals is achieved by using the network of intermediate base stations to transmit the data.
Abstract:
무선 네트워크 시스템에서 저전력의 복수의 노드와 고전력 싱크간의 신호를 송수신하는 방법이 제공된다. 일 실시예에서 신호 송수신 방법은 슈퍼프레임의 시작을 지시하는 비콘 신호를 상기 복수의 노드로 송신하는 단계; 상기 슈퍼프레임의 제1 구간에서, 하향 링크 신호를 상기 복수의 노드로 송신하는 단계; 및 상기 슈퍼프레임의 제2 구간에서, 상향 링크 신호를 다중 홉 중계를 통하여 수신하는 단계를 포함하되, 상기 복수의 노드는 상기 비콘 신호를 수신할 때 수신 신호 강도 지표(RSSI)를 생성하며, 상기 상향 링크 신호는 상기 각 노드의 수신 신호 강도 지표에 따라 상기 싱크로 전달된다.
Abstract:
A method for effective flow rate estimation for a plurality of video flows includes determining a first flow rate of each of the plurality of video flows in a first transmission window and receiving quality of experience (QoE) feedback for playing portions of the plurality of video flows in the first transmission window. The QoE feedback is received from a plurality of user equipments (UEs) receiving the plurality of video flows. A dynamic effective flow rate is estimated for each flow in the plurality of video flows in a second transmission window in accordance with at least the first flow rates of the plurality of video flows and the QoE feedback.