1109 results about "Broadcast packet" patented technology

The discovery and configuration of devices of interest connected to the Ethernet by an Ethernet port is disclosed. To perform discovery, Client software in a management interface transmits packets including the address of the management interface and a port identifier to a known broadcast address, requesting the MAC address for all devices of interest. Server software in the devices of interest parse the broadcast packets and broadcast a packet containing a MAC address that uniquely identifies the devices of interest back to the Client. Once the MAC addresses are returned to the Client, the Client can then broadcast protocol packets requesting the configuration of a specific device of interest such as a new IP address. Once a device of interest is configured with at least an IP address, the device of interest can communicate using TCP/IP, and it can thereafter be managed using higher level tools and firmware.

Some embodiments use proxies on host devices to suppress broadcast traffic in a network. Each host in some embodiments executes one or more virtual machines (VMs). In some embodiments, a proxy operates on each host between each VM and the underlying network. For instance, in some of these embodiments, a VM's proxy operates between the VM and a physical forwarding element executing on the VM's host. The proxy monitors the VM's traffic, and intercepts broadcast packets when it knows how to deal with them. The proxy connects to a set of one or more controllers that provides a directory service that collects and maintains global information of the network. By connecting to the controller cluster, the proxy can obtain information that it can use to resolve broadcast requests. In some embodiments, the connection between the proxy and the controller cluster is encrypted and authenticated, to enhance the security. Also, in some embodiments, the connection is an indirect connection through an agent that executes on the host device and connects the proxies of the host device with the controller cluster.

The invention provides a positioning system of an indoor mobile device. The positioning system comprises three base stations, a mobile terminal, a signal processing module, a wireless transmitting module and a background server. The three base stations are used for periodically sending Bluetooth signals in a Bluetooth wireless transmission mode, and the Bluetooth signals comprise broadcast packets of mark information of the base stations and signal intensities. The mobile terminal comprises a receiving module, wherein the receiving module is used for receiving the Bluetooth signals and determining the mark information of the base stations and the signal intensities according to the content of the broadcast packets. The signal processing module is used for calculating the distances between the three base stations and the mobile terminal according to the signal intensities of the three base stations and determining position information of the mobile terminal according to the three-point positioning algorithm. The wireless transmitting module is used for transmitting the position information to the background server through a wireless communication network. The background server is used for selectively pushing service information to the mobile terminal according to information of the distances between the mobile terminal and the base stations. After accurate positioning is carried out, data can be accurately pushed, and therefore various kinds of applications such as position marketing can be achieved.

Unique Media Access Control (MAC) addresses are determined for dynamically addressable synthetic and physical network devices by requesting a MAC address anonymously from a server acting as an address allocator and arbiter, confirming the use of the requested MAC address, and relinquishing the address to the server for reuse when the MAC address is no longer needed. Alternatively, an agent with a known or established MAC address may be used to request a unique MAC address for the device from the server and to inform the server when the device no longer requires the requested MAC address. Also, instead of requesting a MAC address from a server acting as an address allocator and arbiter, the device instead may send a broadcast Ethernet packet with a broadcast source address having a payload indicating an intent to use a specific MAC address. If another device receiving this broadcast is already using the specific MAC address, then a broadcast packet is sent indicating a conflict with the device's intended address. In this case, the original device would send a new broadcast Ethernet packet with a payload indicating an intent to use a different specific MAC address. This process repeats until no response or assertion of use of the specific address in the payload is received by the original device. These techniques assure that dynamically addressable synthetic devices (such as virtual machines) and physical network devices do not attempt to use the same MAC address on the same network link.

Routers of a content network include routing entries that specify aggregation levels, enabling the routers to establish a tree-based topology within an aggregation realm for distribution of broadcast packets. Each router is configured to have a prescribed aggregation level within the aggregation realm, and identify a network-directed broadcast packet based on detecting a prescribed pluricast code at a corresponding prescribed prefix location relative to the prescribed aggregation level. Each router also is configured for storing a registration request within its routing entries, and propagating the registration request to other routers within the aggregation realm. Each registration request includes a bit mask according to one of the prescribed aggregation levels. Hence, client-based registration requests can be propagated throughout the aggregation realm for rules-based coalescence of subscriber groups throughout the aggregation realm.

The invention relates to a method and a system for managing parking of shared bikes. The method comprises steps as follows: proper positions are selected on two sides of a road to serve as shared bike parking spaces, and electronic parking piles are fixed nearby the shared bike parking spaces; the electronic parking piles transmit broadcast data packets around constantly in a wireless radio frequency manner; when users need to lock the bikes, intelligent locks of the shared bikes and the electronic parking piles conduct communication through the broadcast data packets; on the basis the fact whether the intelligent locks receive the broadcast data packets transmitted by the electronic parking piles, the response state of the intelligent locks is controlled when the user locks the bikes; after the users lock the bikes, the intelligent locks send locking information and received information from the electronic parking piles to a background cloud server; the background cloud server records bike parking information, analyzes the number of the shared bikes at the parking spaces in real time and conducts dispatching management on the shared bikes. The problem of disordered parking of the shared bikes can be solved, and besides, real-time monitoring of bike vacancy and rapid bike dispatching by workers are facilitated.

Systems and methods are provided for improving efficiency and reliability of broadcast transmission in a multi-hop wireless mesh communication network. In some implementations, systems and methods are provided for a leaf mesh node to acknowledge reception of a broadcast packet broadcast by an Intelligent Access Point (IAP), and for allowing the IAP to determine whether to re-communicate the broadcast packet that it had previously re-transmitted when no acknowledgment is received from a leaf mesh node.

Packet communication method and system in which a packet destined for a terminal is provided service according to a service table indexed by packet classification and the terminal's power mode. The service table may specify for a connection a predetermined quality of service or discarding the packet. For a power mode having an alerting (i.e., paging) mechanism, the service may include alerting the terminal. The service table may also include a network edge point's own service requests and service requests from terminals, provisioning servers, and handoff sources. For a multicast or broadcast packet, as each terminal may be in a different power mode, the associated service in the service table may therefore be different for each terminal. In that case, the packet is provided with service so that any given terminal is provided with at least the quality of service specified in the service table. Thus, a multicast or broadcast packet is discarded when the service specified for all terminals is “discard.” Each terminal is alerted, however, if the associated service includes alerting the terminal. During handoff, a part of service table associated with the terminal can be transferred from the handoff source to the handoff destination.

In a multinode data processing system in which the nodes communicate with one another through communication adapters coupled to a switch or network, a method is provided for using the Internet Protocol (IP) for transmitting large broadcast data packets without incurring the overhead normally associated with packet fragmentation. By adding an Internet Protocol (IP) header as the first header in every packet fragment in the fragmentation process, fragmented packets are able to be assembled in the IP layer without intervention at the adapter interface layer.

A method for collocated nodes communicating over a first interface to agree on a conflict-free transmission schedule among themselves, which they can then use to collaborate with neighbors accessed through a second interface, for example through wireless links in order to obtain collision-free transfers of unicast, multicast and broadcast packets over wireless channels, and channel access delay guarantees. The collocated nodes behave as a single virtual node for the purpose of establishing a consistent transmission schedule throughout the nodes of a multihop wireless network.

The invention is suitable for the technical field of communication and provides a Bluetooth connecting method and Bluetooth equipment. The method includes the steps that the first Bluetooth equipment starts the Bluetooth function and obtains address information, stored in advance, of the Bluetooth equipment to be connected, a directional broadcasting data packet is sent for waiting for connection, and the directional broadcasting data packet comprises the address information of the Bluetooth equipment to be connected; after the second Bluetooth equipment receives the directional broadcasting data packet, the address information in the directional broadcasting data packet is obtained after the second Bluetooth equipment receives the directional broadcasting data packet, and connection requesting information is sent to the first Bluetooth equipment so that the Bluetooth connection between the second Bluetooth equipment and the first Bluetooth equipment can be established when the address information is the same with the Bluetooth address information of the second Bluetooth equipment. According to the Bluetooth connecting method and Bluetooth equipment, directional connection of the Bluetooth equipment is achieved, and the Bluetooth connecting speed and efficiency are improved.

The invention provides a method and a system for the fusion of multi-source monitoring data based on a heterogeneous clustering wireless sensor network. The system comprises a plurality of monitoring nodes, a plurality of cluster head nodes, a plurality of trunk nodes, a gateway node and an upper computer. The method comprises the following steps: after the gateway node switches on the upper computer, a PAN network in conformity with the ZigBee protocol is established; after the cluster head nodes and the trunk nodes are electrified, the cluster head nodes and the trunk nodes search for and join in the PAN network to form a wireless meshed network; the cluster head nodes receive broadcast packets of the monitoring nodes to carry out correlation calculation, and provide the calculation result to the upper computer through the wireless meshed network to carry out clustering processing; and then, the monitoring nodes in the cluster acquire environmental data according to the clustering result and send the data to the cluster head nodes in the cluster, and the cluster head nodes send the acquired environmental data to the upper computer through the wireless meshed network to be subjected to corresponding processing based on different sources of the environmental data. Thus, the heterogeneous clustering wireless sensor network and the wireless meshed network are combined, and the advantages of the both can be fully used for data acquisition.

The invention discloses an SDN (Software-Defined Networking) controller-based DHCP (Dynamic Host Configuration Protocol) broadcast processing method. The method aims to solve the problem of DHCP broadcast flooding on the basis of the SDN controller, mainly adopts a packet-out message manner to transmit DHCP broadcast packets between a source host computer and a DHCP server by caching the position of the DHCP server at the end of a controller, and meanwhile is used for recording the basic information of a host computer, which includes the IP address, MAC address and position information, when the host computer succeeds in acquiring configuration information such as the IP address. The method greatly reduces the load of the controller and network flow.

The invention provides a method for networking multiple Bluetooth devices. The method includes broadcasting/scanning white list configuration to constrain networking ranges; enabling the Bluetooth devices to transmit data packets by means of broadcasting during communication, allowing the other Bluetooth devices in networks to acquire data by means of scanning, analyzing the data and determining abandoning, instruction executing or forwarding processing modes for the broadcast packets according to transmitting device addresses and receiving device addresses of the broadcast packets and the times of receiving the broadcast packets. According to the technical scheme, the method has the advantages that constraints on the quantity of slave devices which are allowed to be connected with master Bluetooth devices can be broken through, Bluetooth networking device scales can be expanded, and constraints on Bluetooth networking communication scales and distances can be extended.

Computer networks with multiple nodes are often required to deliver packets to all nodes in the network, commonly referred to as “flooding.” Flooding is used to deliver multicast and broadcast packets generated by application, network and other layers of the networking stack. Flooding can be done very reliably but less efficiently via node to node “unicast” transmissions, or very efficiently but less reliably via “broadcast” transmissions. In order to balance reliability with efficiency, this invention defines a threshold for the number of neighboring nodes as seen by a given node prior to a flooding operation to determine whether data should be unicast or broadcast. Below that threshold, unicast is used; at or above that threshold, broadcast is used. The invention also incorporates knowledge of nodes seen in turn by neighbor nodes as part of this decision.

A communication and control system for use by the disabled and their caretakers. The system has at least two communication modules, each module having a processing unit which has a unique identification code. Each communication module also has a unique hierarchical address corresponding to the identification code, the address defining the physical location of the module. The hierarchical address represents at least two physical domains. Each commnunication module further includes a processing unit having coupled to it one or both of a signal receiver and a signal transmitter, and at least one transducer for detecting a physical parameter and for broadcasting packets of data indicative of the status of a module or for controlling a remote module.

The invention provides a hierarchical structure based wireless sensor network time synchronization method. According to the hierarchical structure based wireless sensor network time synchronization method, gateway nodes and aggregation nodes are distributed in a monitoring site in advance and sensor nodes are carried by operators; the gateway nodes send hierarchy establishment broadcast data packages with time stamps; the aggregation nodes and the sensor nodes within the communication distance range extract hierarchy information after receiving the data packages, hierarchies of the aggregation nodes and the sensor nodes are changed by adding one to the current hierarchies, and local clocks are modified according to the time stamps; the gateway nodes are served as global time after network hierarchies are built, the timed polling sends time synchronization data packages to aggregation sub-nodes and the aggregation nodes synchronize the local clock time and the global time through the time synchronization algorithm; the sensor nodes perform time synchronization on the local clocks by intercepting time synchronization mutual data package information. The hierarchical structure based wireless sensor network time synchronization method achieves high accuracy time synchronization and improves the wireless sensor network channel utilization rate and the network life cycle.

Disclosed is a method for registering devices on an Internet of things platform. The method comprises the following steps: a user terminal sending a broadcast packet in a local area network so as to obtain the devices supporting an agreed protocol in the local area network; the user terminal receiving equipment device sent by the devices supporting the agreed protocol in the local area network, wherein the equipment information comprises physical identification codes; the user terminal sending the physical identification codes to the Internet of things platform; the user terminal receiving equipment accounts and equipment passwords corresponding thereto which are generated according to the physical identification codes and are returned by the Internet of things platform, wherein the equipment accounts and the equipment passwords are used by the devices for registering the Internet of things platform so as to enable the devices to communicate with the Internet of things platform; and the user terminal sending the equipment accounts and the equipment passwords to the corresponding devices. The method provided by the invention provides a foundation for communication between a user end and the devices. Besides, the invention further discloses an apparatus for registering devices on an Internet of things platform.

The invention provides an ultralow-power consumption smart equipment rapid network accessing method and a smart home system. The method comprises steps that a to-be-accessed new smart device sends a broadcast packet; a mobile terminal selects a networking gateway to be connected with the to-be-accessed new smart device, when the broadcast packet is scanned, immediate connection is carried out and related network accessing information of the new device is obtained, and the mobile terminal sends a device adding command to a cloud server; the cloud server requests network opening to the networking gateway, when the verification is successful, the networking gateway actively opens the network and returns a unique network identifier ID to the cloud server; the new smart device performs identity verification; and if the verification is successful, the new smart device can access the network, otherwise, the new smart device cannot access the network. The advantages are that 1) the interference problem that multiple devices around access the network at the same time is solved, multiple new devices are allowed to access the network at the same time without mutual interference; 2) searching for the networking gateway is not required for accessing the network, so that the networking accessing is fast; and 3) the device achieves real-time online communication.

Disclosed is a wireless communication method capable of a connectionless broadcast. The wireless communication method has the steps of generating a synchronization information for synchronizing with more than one receiver, and a broadcast data packet containing a broadcast data, broadcasting the synchronization information and synchronizing a channel with the receiver, and transmitting the broadcast data packet to the synchronized receiver. Accordingly, without a waste of time in the connection setup procedure, the broadcast data is promptly transmitted to the receiver.