Wireless mesh network

About: Wireless mesh network is a research topic. Over the lifetime, 13600 publications have been published within this topic receiving 221035 citations. The topic is also known as: WMN.

Crossconnection of wavelength-division-multiplexed high-speed channels

Abstract: The letter describes a wavelength-division-multiplexing structure to establish point-to-point connectivity of high-speed channels between network nodes. The information-handling capacity of the network exceeds 1 Tbit/s, which can only be duplicated otherwise by a complete fibre mesh structure. A small-scale experimental system with two transmitting nodes and two receiving nodes, each with two wavelengths, is reported.

Wireless node apparatus and multihop wireless lan system

Abstract: Disclosed is a technique of transferring packets among wireless nodes as done in a tree type LAN, without intervening a root node to achieve efficient communications among the wireless nodes. According to the technique, a multihop wireless LAN is constructed by wireless nodes in such a way that it is determined whether or not a wireless node is a root node upon activation; when it is determined that the wireless node is the root node, status information is notified to wireless nodes to be connected, when it is determined that the wireless node is not the root node, wireless nodes to be connection candidates are requested to acquire status information, a higher-rank base station wireless node to be connected is selected and connected based on the status information, and when the wireless node apparatus is made a connection candidate later, status information is notified to wireless nodes. The wireless node includes bridge transfer means 101 which transfers packets from wireless nodes connected as higher-rank base stations to the higher-rank base station wireless node or the wireless node apparatuses connected as higher-rank base stations, or transfers a packet from the higher-rank base station wireless node to the wireless nodes connected as higher-rank base stations.

Method and apparatus for end node assisted neighbor discovery

Abstract: Methods and apparatus for using end nodes, e.g., wireless terminals, to discover base stations and communicate information about discovered access nodes, e.g., base stations, to other access nodes in a system are described. As the wireless terminal roams in the system and new access nodes are encountered, one or more physically adjacent access nodes will be informed of the presence of the new access node as a result of communications with the wireless terminal. A message indicating an access node's inability to route a message to another access node which is known to a wireless terminal may trigger the wireless terminal to begin the process of updating access node routing and neighbor information.

ONU Placement in Fiber-Wireless (FiWi) Networks Considering Peer-to-Peer Communications

Abstract: Nowadays, Fiber-Wireless (FiWi) network is proposed as a hybrid access network that integrates optical access networks (e.g., PONs) with wireless access networks (e.g., WMNs) to provide the high bandwidth, cost-efficient and ubiquitous last mile Internet access. In FiWi networks, besides traffic from wireless mesh clients to the Internet, peer-to-peer communication from one wireless client to another wireless client is introduced due to the recent growth of applications such as multimedia transmissions within community areas. In FiWi networks, such peer-to-peer traffic can be carried either through the wireless path within the wireless mesh subnetwork or through the wireless-optical-wireless mode in which traffic firstly goes from the source client to its closest ONU, and then goes to the ONU closest to the destination client through the PON subnetwork and finally reaches the destination client. Such wireless-optical-wireless mode for peer-to-peer communications can alleviate interferences in the wireless subnetwork, thus improving the network throughput. Considering such mode for peer-to-peer communications, ONUs' placement will have great impact on the achievable network throughput in FiWi networks and will be different from the placement when only traffic to the Internet is considered. In this paper, given the distribution of wireless mesh routers, we study where to place K ONUs in FiWi networks so that the overall network throughput can be maximized when peer-to-peer communications are considered in addition to traffic destinated to the Internet. We first formulate the problem and then propose a Tabu Search (TS) based heuristic to solve the problem. Simulation results show that compared to the random deployment and the fixed deployment which performs well when only traffic to the Internet is considered, the tabu search heuristic has a much better performance.

On-Demand Medium Access in Multihop Wireless Networks with Multiple Beam Smart Antennas

Abstract: The paper presents a detailed discussion of various issues involved in designing a medium access control (MAC) protocol for multihop wireless networks with nodes employing multiple beam smart antennas. Multiple beam smart antennas can form several beams simultaneously and can initiate concurrent transmissions or receptions .in them, thereby increasing the throughput of the bottleneck nodes. Traditional on-demand MAC protocols for omnidirectional and single beam directional antennas based on the IEEE 802.11 distributed coordination function (DCF) mechanism cannot take advantage of this unique capability of multiple beam antennas as they do not facilitate concurrent transmissions or receptions by a node. This paper introduces a novel protocol, hybrid MAC (HMAC), which enables concurrent packet reception (CPR) and concurrent packet transmission (CPT) at a node equipped with multiple beam antennas and is backward compatible with IEEE 802.11 DCF. Simulation results show the superior performance of HMAC in most ad hoc scenarios. Moreover, in some sample topologies, the throughput of HMAC is close to the theoretical maximum. The paper also presents a wireless mesh network architecture with heterogeneous antenna technologies and illustrates the advantages of employing multiple beam smart antennas and HMAC in such networks.